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Author SHA1 Message Date
Agniva De Sarker
ecc7dd5469 test/codegen: fix wasm codegen breakage 
i32.eqz instructions don't appear unless needed in if conditions anymore
after CL 195204. I forgot to run the codegen tests while submitting the CL.

Thanks to @martisch for catching it.

Fixes #34442

Change-Id: I177b064b389be48e39d564849714d7a8839be13e
Reviewed-on: https://go-review.googlesource.com/c/go/+/196580
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
 2019-09-21 16:31:44 +00:00
Matthew Dempsky
85fc765341 cmd/compile: optimize switch on strings 
When compiling expression switches, we try to optimize runs of
constants into binary searches. The ordering used isn't visible to the
application, so it's unimportant as long as we're consistent between
sorting and searching.

For strings, it's much cheaper to compare string lengths than strings
themselves, so instead of ordering strings by "si <= sj", we currently
order them by "len(si) < len(sj) || len(si) == len(sj) && si <= sj"
(i.e., the lexicographical ordering on the 2-tuple (len(s), s)).

However, it's also somewhat cheaper to compare strings for equality
(i.e., ==) than for ordering (i.e., <=). And if there were two or
three string constants of the same length in a switch statement, we
might unnecessarily emit ordering comparisons.

For example, given:

    switch s {
    case "", "1", "2", "3": // ordered by length then content
        goto L
    }

we currently compile this as:

    if len(s) < 1 || len(s) == 1 && s <= "1" {
        if s == "" { goto L }
        else if s == "1" { goto L }
    } else {
        if s == "2" { goto L }
        else if s == "3" { goto L }
    }

This CL switches to using a 2-level binary search---first on len(s),
then on s itself---so that string ordering comparisons are only needed
when there are 4 or more strings of the same length. (4 being the
cut-off for when using binary search is actually worthwhile.)

So the above switch instead now compiles to:

    if len(s) == 0 {
        if s == "" { goto L }
    } else if len(s) == 1 {
        if s == "1" { goto L }
        else if s == "2" { goto L }
        else if s == "3" { goto L }
    }

which is better optimized by walk and SSA. (Notably, because there are
only two distinct lengths and no more than three strings of any
particular length, this example ends up falling back to simply using
linear search.)

Test case by khr@ from CL 195138.

Fixes #33934.

Change-Id: I8eeebcaf7e26343223be5f443d6a97a0daf84f07
Reviewed-on: https://go-review.googlesource.com/c/go/+/195340
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-09-18 05:33:05 +00:00
LE Manh Cuong
ec4e8517cd cmd/compile: support more length types for slice extension optimization 
golang.org/cl/109517 optimized the compiler to avoid the allocation for make in
append(x, make([]T, y)...). This was only implemented for the case that y has type int.

This change extends the optimization to trigger for all integer types where the value
is known at compile time to fit into an int.

name             old time/op    new time/op    delta
ExtendInt-12        106ns ± 4%     106ns ± 0%      ~     (p=0.351 n=10+6)
ExtendUint64-12    1.03µs ± 5%    0.10µs ± 4%   -90.01%  (p=0.000 n=9+10)

name             old alloc/op   new alloc/op   delta
ExtendInt-12        0.00B          0.00B           ~     (all equal)
ExtendUint64-12    13.6kB ± 0%     0.0kB       -100.00%  (p=0.000 n=10+10)

name             old allocs/op  new allocs/op  delta
ExtendInt-12         0.00           0.00           ~     (all equal)
ExtendUint64-12      1.00 ± 0%      0.00       -100.00%  (p=0.000 n=10+10)

Updates #29785

Change-Id: Ief7760097c285abd591712da98c5b02bc3961fcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/182559
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-09-17 17:18:17 +00:00
Alberto Donizetti
c2facbe937 Revert "test/codegen: document -all_codegen option in README" 
This reverts CL 192101.

Reason for revert: The same paragraph was added 2 weeks ago
(look a few lines above)

Change-Id: I05efb2631d7b4966f66493f178f2a649c715a3cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/195637
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-09-16 17:31:37 +00:00
Cherry Zhang
d9b8ffa51c test/codegen: document -all_codegen option in README 
It is useful to know about the -all_codegen option for running
codegen tests for all platforms. I was puzzling that some codegen
test was not failing on my local machine or on trybot, until I
found this option.

Change-Id: I062cf4d73f6a6c9ebc2258195779d2dab21bc36d
Reviewed-on: https://go-review.googlesource.com/c/go/+/192101
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-09-16 11:53:57 +00:00
Ruixin Bao
98aa97806b cmd/compile: add math/bits.Mul64 intrinsic on s390x 
This change adds an intrinsic for Mul64 on s390x. To achieve that,
a new assembly instruction, MLGR, is introduced in s390x/asmz.go. This assembly
instruction directly uses an existing instruction on Z and supports multiplication
of two 64 bit unsigned integer and stores the result in two separate registers.

In this case, we require the multiplcand to be stored in register R3 and
the output result (the high and low 64 bit of the product) to be stored in
R2 and R3 respectively.

A test case is also added.

Benchmark:
name      old time/op  new time/op  delta
Mul-18    11.1ns ± 0%   1.4ns ± 0%  -87.39%  (p=0.002 n=8+10)
Mul32-18  2.07ns ± 0%  2.07ns ± 0%     ~     (all equal)
Mul64-18  11.1ns ± 1%   1.4ns ± 0%  -87.42%  (p=0.000 n=10+10)

Change-Id: Ieca6ad1f61fff9a48a31d50bbd3f3c6d9e6675c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/194572
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-09-13 09:04:48 +00:00
Michael Munday
5c5f217b63 cmd/compile: improve s390x sign/zero extension removal 
This CL gets rid of the MOVDreg and MOVDnop SSA operations on
s390x. They were originally inserted to help avoid situations
where a sign/zero extension was elided but a spill invalidated
the optimization. It's not really clear we need to do this though
(amd64 doesn't have these ops for example) so long as we are
careful when removing sign/zero extensions. Also, the MOVDreg
technique doesn't work if the register is spilled before the
MOVDreg op (I haven't seen that in practice).

Removing these ops reduces the complexity of the rules and also
allows us to unblock optimizations. For example, the compiler can
now merge the loads in binary.{Big,Little}Endian.PutUint16 which
it wasn't able to do before. This CL reduces the size of the .text
section in the go tool by about 4.7KB (0.09%).

Change-Id: Icaddae7f2e4f9b2debb6fabae845adb3f73b41db
Reviewed-on: https://go-review.googlesource.com/c/go/+/173897
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-09-10 13:17:24 +00:00
Martin Möhrmann
5bb59b6d16 Revert "compile: prefer an AND instead of SHR+SHL instructions" 
This reverts commit 9ec7074a94.

Reason for revert: broke s390x (copysign, abs) and arm64 (bitfield) tests.

Change-Id: I16c1b389c062e8c4aa5de079f1d46c9b25b0db52
Reviewed-on: https://go-review.googlesource.com/c/go/+/193850
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-09-09 07:33:25 +00:00
Martin Möhrmann
9ec7074a94 compile: prefer an AND instead of SHR+SHL instructions 
On modern 64bit CPUs a SHR, SHL or AND instruction take 1 cycle to execute.
A pair of shifts that operate on the same register will take 2 cycles
and needs to wait for the input register value to be available.

Large constants used to mask the high bits of a register with an AND
instruction can not be encoded as an immediate in the AND instruction
on amd64 and therefore need to be loaded into a register with a MOV
instruction.

However that MOV instruction is not dependent on the output register and
on many CPUs does not compete with the AND or shift instructions for
execution ports.

Using a pair of shifts to mask high bits instead of an AND to mask high
bits of a register has a shorter encoding and uses one less general
purpose register but is slower due to taking one clock cycle longer
if there is no register pressure that would make the AND variant need to
generate a spill.

For example the instructions emitted for (x & 1 << 63) before this CL are:
48c1ea3f                SHRQ $0x3f, DX
48c1e23f                SHLQ $0x3f, DX

after this CL the instructions are the same as GCC and LLVM use:
48b80000000000000080    MOVQ $0x8000000000000000, AX
4821d0                  ANDQ DX, AX

Some platforms such as arm64 already have SSA optimization rules to fuse
two shift instructions back into an AND.

Removing the general rule to rewrite AND to SHR+SHL speeds up this benchmark:

var GlobalU uint

func BenchmarkAndHighBits(b *testing.B) {
	x := uint(0)
	for i := 0; i < b.N; i++ {
		x &= 1 << 63
	}
	GlobalU = x
}

amd64/darwin on Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz:
name           old time/op  new time/op  delta
AndHighBits-4  0.61ns ± 6%  0.42ns ± 6%  -31.42%  (p=0.000 n=25+25):

Updates #33826
Updates #32781

Change-Id: I862d3587446410c447b9a7265196b57f85358633
Reviewed-on: https://go-review.googlesource.com/c/go/+/191780
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-09-09 06:49:17 +00:00
Alberto Donizetti
e6d2544d20 test/codegen: mention -all_codegen in the README 
For performance reasons (avoiding costly cross-compilations) CL 177577
changed the codegen test harness to only run the tests for the
machine's GOARCH by default.

This change updates the codegen README accordingly, explaining what
all.bash does run by default and how to perform the tests for all
architectures.

Fixes #33924

Change-Id: I43328d878c3e449ebfda46f7e69963a44a511d40
Reviewed-on: https://go-review.googlesource.com/c/go/+/192619
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
 2019-09-01 15:37:13 +00:00
Brian Kessler
b003afe4fe cmd/compile: intrinsify RotateLeft32 on wasm 
wasm has 32-bit versions of all integer operations. This change
lowers RotateLeft32 to i32.rotl on wasm and intrinsifies the math/bits
call.  Benchmarking on amd64 under node.js this is ~25% faster.

node v10.15.3/amd64
name          old time/op  new time/op  delta
RotateLeft    8.37ns ± 1%  8.28ns ± 0%   -1.05%  (p=0.029 n=4+4)
RotateLeft8   11.9ns ± 1%  11.8ns ± 0%     ~     (p=0.167 n=5+5)
RotateLeft16  11.8ns ± 0%  11.8ns ± 0%     ~     (all equal)
RotateLeft32  11.9ns ± 1%   8.7ns ± 0%  -26.32%  (p=0.008 n=5+5)
RotateLeft64  8.31ns ± 1%  8.43ns ± 2%     ~     (p=0.063 n=5+5)

Updates #31265

Change-Id: I5b8e155978faeea536c4f6427ac9564d2f096a46
Reviewed-on: https://go-review.googlesource.com/c/go/+/182359
Run-TryBot: Brian Kessler <brian.m.kessler@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>
 2019-08-31 17:03:04 +00:00
Ben Shi
1786ecd502 cmd/compile: eliminate WASM's redundant extension & wrapping 
This CL eliminates unnecessary pairs of I32WrapI64 and
I64ExtendI32U generated by the WASM backend for IF
statements. And it makes the total size of pkg/js_wasm/
decreases about 490KB.

Change-Id: I16b0abb686c4e30d5624323166ec2d0ec57dbe2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/191758
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>
 2019-08-30 21:20:03 +00:00
Ben Shi
8d5197d818 cmd/compile: optimize 386's math.bits.TrailingZeros16 
This CL reverts CL 192097 and fixes the issue in CL 189277.

Change-Id: Icd271262e1f5019a8e01c91f91c12c1261eeb02b
Reviewed-on: https://go-review.googlesource.com/c/go/+/192519
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-08-30 17:37:00 +00:00
Cherry Zhang
9859f6bedb test/codegen: fix ARM32 RotateLeft32 test 
The syntax of a shifted operation does not have a "$" sign for
the shift amount. Remove it.

Change-Id: I50782fe942b640076f48c2fafea4d3175be8ff99
Reviewed-on: https://go-review.googlesource.com/c/go/+/192100
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2019-08-28 20:42:48 +00:00
Ben Shi
3cfd003a8a cmd/compile: optimize ARM's math.bits.RotateLeft32 
This CL optimizes math.bits.RotateLeft32 to inline
"MOVW Rx@>Ry, Rd" on ARM.

The benchmark results of math/bits show some improvements.
name               old time/op  new time/op  delta
RotateLeft-4       9.42ns ± 0%  6.91ns ± 0%  -26.66%  (p=0.000 n=40+33)
RotateLeft8-4      8.79ns ± 0%  8.79ns ± 0%   -0.04%  (p=0.000 n=40+31)
RotateLeft16-4     8.79ns ± 0%  8.79ns ± 0%   -0.04%  (p=0.000 n=40+32)
RotateLeft32-4     8.16ns ± 0%  7.54ns ± 0%   -7.68%  (p=0.000 n=40+40)
RotateLeft64-4     15.7ns ± 0%  15.7ns ± 0%     ~     (all equal)

updates #31265

Change-Id: I77bc1c2c702d5323fc7cad5264a8e2d5666bf712
Reviewed-on: https://go-review.googlesource.com/c/go/+/188697
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-08-28 15:41:58 +00:00
Ben Shi
c683ab8128 cmd/compile: optimize ARM's math.Abs 
This CL optimizes math.Abs to an inline ABSD instruction on ARM.

The benchmark results of src/math/ show big improvements.
name                   old time/op  new time/op  delta
Acos-4                  181ns ± 0%   182ns ± 0%   +0.30%  (p=0.000 n=40+40)
Acosh-4                 202ns ± 0%   202ns ± 0%     ~     (all equal)
Asin-4                  163ns ± 0%   163ns ± 0%     ~     (all equal)
Asinh-4                 242ns ± 0%   242ns ± 0%     ~     (all equal)
Atan-4                  120ns ± 0%   121ns ± 0%   +0.83%  (p=0.000 n=40+40)
Atanh-4                 202ns ± 0%   202ns ± 0%     ~     (all equal)
Atan2-4                 173ns ± 0%   173ns ± 0%     ~     (all equal)
Cbrt-4                 1.06µs ± 0%  1.06µs ± 0%   +0.09%  (p=0.000 n=39+37)
Ceil-4                 72.9ns ± 0%  72.8ns ± 0%     ~     (p=0.237 n=40+40)
Copysign-4             13.2ns ± 0%  13.2ns ± 0%     ~     (all equal)
Cos-4                   193ns ± 0%   183ns ± 0%   -5.18%  (p=0.000 n=40+40)
Cosh-4                  254ns ± 0%   239ns ± 0%   -5.91%  (p=0.000 n=40+40)
Erf-4                   112ns ± 0%   112ns ± 0%     ~     (all equal)
Erfc-4                  117ns ± 0%   117ns ± 0%     ~     (all equal)
Erfinv-4                127ns ± 0%   127ns ± 1%     ~     (p=0.492 n=40+40)
Erfcinv-4               128ns ± 0%   128ns ± 0%     ~     (all equal)
Exp-4                   212ns ± 0%   206ns ± 0%   -3.05%  (p=0.000 n=40+40)
ExpGo-4                 216ns ± 0%   209ns ± 0%   -3.24%  (p=0.000 n=40+40)
Expm1-4                 142ns ± 0%   142ns ± 0%     ~     (all equal)
Exp2-4                  191ns ± 0%   184ns ± 0%   -3.45%  (p=0.000 n=40+40)
Exp2Go-4                194ns ± 0%   187ns ± 0%   -3.61%  (p=0.000 n=40+40)
Abs-4                  14.4ns ± 0%   6.3ns ± 0%  -56.39%  (p=0.000 n=38+39)
Dim-4                  12.6ns ± 0%  12.6ns ± 0%     ~     (all equal)
Floor-4                49.6ns ± 0%  49.6ns ± 0%     ~     (all equal)
Max-4                  27.6ns ± 0%  27.6ns ± 0%     ~     (all equal)
Min-4                  27.0ns ± 0%  27.0ns ± 0%     ~     (all equal)
Mod-4                   349ns ± 0%   305ns ± 1%  -12.55%  (p=0.000 n=33+40)
Frexp-4                54.0ns ± 0%  47.1ns ± 0%  -12.78%  (p=0.000 n=38+38)
Gamma-4                 242ns ± 0%   234ns ± 0%   -3.16%  (p=0.000 n=36+40)
Hypot-4                84.8ns ± 0%  67.8ns ± 0%  -20.05%  (p=0.000 n=31+35)
HypotGo-4              88.5ns ± 0%  71.6ns ± 0%  -19.12%  (p=0.000 n=40+38)
Ilogb-4                45.8ns ± 0%  38.9ns ± 0%  -15.12%  (p=0.000 n=40+32)
J0-4                    821ns ± 0%   802ns ± 0%   -2.33%  (p=0.000 n=33+40)
J1-4                    816ns ± 0%   807ns ± 0%   -1.05%  (p=0.000 n=40+29)
Jn-4                   1.67µs ± 0%  1.65µs ± 0%   -1.45%  (p=0.000 n=40+39)
Ldexp-4                61.5ns ± 0%  54.6ns ± 0%  -11.27%  (p=0.000 n=40+32)
Lgamma-4                188ns ± 0%   188ns ± 0%     ~     (all equal)
Log-4                   154ns ± 0%   147ns ± 0%   -4.78%  (p=0.000 n=40+40)
Logb-4                 50.9ns ± 0%  42.7ns ± 0%  -16.11%  (p=0.000 n=34+39)
Log1p-4                 160ns ± 0%   159ns ± 0%     ~     (p=0.828 n=40+40)
Log10-4                 173ns ± 0%   166ns ± 0%   -4.05%  (p=0.000 n=40+40)
Log2-4                 65.3ns ± 0%  58.4ns ± 0%  -10.57%  (p=0.000 n=37+37)
Modf-4                 36.4ns ± 0%  36.4ns ± 0%     ~     (all equal)
Nextafter32-4          36.4ns ± 0%  36.4ns ± 0%     ~     (all equal)
Nextafter64-4          32.7ns ± 0%  32.6ns ± 0%     ~     (p=0.375 n=40+40)
PowInt-4                300ns ± 0%   277ns ± 0%   -7.78%  (p=0.000 n=40+40)
PowFrac-4               676ns ± 0%   635ns ± 0%   -6.00%  (p=0.000 n=40+35)
Pow10Pos-4             17.6ns ± 0%  17.6ns ± 0%     ~     (all equal)
Pow10Neg-4             22.0ns ± 0%  22.0ns ± 0%     ~     (all equal)
Round-4                30.1ns ± 0%  30.1ns ± 0%     ~     (all equal)
RoundToEven-4          38.9ns ± 0%  38.9ns ± 0%     ~     (all equal)
Remainder-4             291ns ± 0%   263ns ± 0%   -9.62%  (p=0.000 n=40+40)
Signbit-4              11.3ns ± 0%  11.3ns ± 0%     ~     (all equal)
Sin-4                   185ns ± 0%   185ns ± 0%     ~     (all equal)
Sincos-4                230ns ± 0%   230ns ± 0%     ~     (all equal)
Sinh-4                  253ns ± 0%   246ns ± 0%   -2.77%  (p=0.000 n=39+39)
SqrtIndirect-4         41.4ns ± 0%  41.4ns ± 0%     ~     (all equal)
SqrtLatency-4          13.8ns ± 0%  13.8ns ± 0%     ~     (all equal)
SqrtIndirectLatency-4  37.0ns ± 0%  37.0ns ± 0%     ~     (p=0.632 n=40+40)
SqrtGoLatency-4         911ns ± 0%   911ns ± 0%   +0.08%  (p=0.000 n=40+40)
SqrtPrime-4            13.2µs ± 0%  13.2µs ± 0%   +0.01%  (p=0.038 n=38+40)
Tan-4                   205ns ± 0%   205ns ± 0%     ~     (all equal)
Tanh-4                  264ns ± 0%   247ns ± 0%   -6.44%  (p=0.000 n=39+32)
Trunc-4                45.2ns ± 0%  45.2ns ± 0%     ~     (all equal)
Y0-4                    796ns ± 0%   792ns ± 0%   -0.55%  (p=0.000 n=35+40)
Y1-4                    804ns ± 0%   797ns ± 0%   -0.82%  (p=0.000 n=24+40)
Yn-4                   1.64µs ± 0%  1.62µs ± 0%   -1.27%  (p=0.000 n=40+39)
Float64bits-4          8.16ns ± 0%  8.16ns ± 0%   +0.04%  (p=0.000 n=35+40)
Float64frombits-4      10.7ns ± 0%  10.7ns ± 0%     ~     (all equal)
Float32bits-4          7.53ns ± 0%  7.53ns ± 0%     ~     (p=0.760 n=40+40)
Float32frombits-4      6.91ns ± 0%  6.91ns ± 0%   -0.04%  (p=0.002 n=32+38)
[Geo mean]              111ns        106ns        -3.98%

Change-Id: I54f4fd7f5160db020b430b556bde59cc0fdb996d
Reviewed-on: https://go-review.googlesource.com/c/go/+/188678
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-08-28 15:41:28 +00:00
Bryan C. Mills
372b0eed17 Revert "cmd/compile: optimize 386's math.bits.TrailingZeros16" 
This reverts CL 189277.

Reason for revert: broke 32-bit builders.

Updates #33902

Change-Id: Ie5f180d0371a90e5057ed578c334372e5fc3a286
Reviewed-on: https://go-review.googlesource.com/c/go/+/192097
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
 2019-08-28 12:57:59 +00:00
Agniva De Sarker
7be97af2ff cmd/compile: apply optimization for readonly globals on wasm 
Extend the optimization introduced in CL 141118 to the wasm architecture.

And for reference, the rules trigger 212 times while building std and cmd

$GOOS=js GOARCH=wasm gotip build std cmd
$grep -E "Wasm.rules:44(1|2|3|4)" rulelog | wc -l
212

Updates #26498

Change-Id: I153684a2b98589ae812b42268da08b65679e09d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/185477
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
 2019-08-28 05:55:52 +00:00
Agniva De Sarker
8fedb2d338 cmd/compile: optimize bounded shifts on wasm 
Use the shiftIsBounded function to generate more efficient
Shift instructions.

Updates #25167

Change-Id: Id350f8462dc3a7ed3bfed0bcbea2860b8f40048a
Reviewed-on: https://go-review.googlesource.com/c/go/+/182558
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
 2019-08-28 04:44:21 +00:00
Ben Shi
22355d6cd2 cmd/compile: optimize 386's math.bits.TrailingZeros16 
This CL optimizes math.bits.TrailingZeros16 on 386 with
a pair of BSFL and ORL instrcutions.

The case TrailingZeros16-4 of the benchmark test in
math/bits shows big improvement.
name               old time/op  new time/op  delta
TrailingZeros16-4  1.55ns ± 1%  0.87ns ± 1%  -43.87%  (p=0.000 n=50+49)

Change-Id: Ia899975b0e46f45dcd20223b713ed632bc32740b
Reviewed-on: https://go-review.googlesource.com/c/go/+/189277
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-08-28 02:29:54 +00:00
Ben Shi
731e6fc34e cmd/compile: generate Select on WASM 
This CL performs the branchelim optimization on WASM with its
select instruction. And the total size of pkg/js_wasm decreased
about 80KB by this optimization.

Change-Id: I868eb146120a1cac5c4609c8e9ddb07e4da8a1d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/190957
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-08-28 02:29:25 +00:00
LE Manh Cuong
c5f142fa9f cmd/compile: optimize bitset tests 
The assembly output for x & c == c, where c is power of 2:

	MOVQ	"".set+8(SP), AX
	ANDQ	$8, AX
	CMPQ	AX, $8
	SETEQ	"".~r2+24(SP)

With optimization using bitset:

	MOVQ	"".set+8(SP), AX
	BTL	$3, AX
	SETCS	"".~r2+24(SP)

output less than 1 instruction.

However, there is no speed improvement:

name         old time/op  new time/op  delta
AllBitSet-8  0.35ns ± 0%  0.35ns ± 0%   ~     (all equal)

Fixes #31904

Change-Id: I5dca4e410bf45716ed2145e3473979ec997e35d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/175957
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-08-27 18:01:16 +00:00
Keith Randall
8f296f59de Revert "Revert "cmd/compile,runtime: allocate defer records on the stack"" 
This reverts CL 180761

Reason for revert: Reinstate the stack-allocated defer CL.

There was nothing wrong with the CL proper, but stack allocation of defers exposed two other issues.

Issue #32477: Fix has been submitted as CL 181258.
Issue #32498: Possible fix is CL 181377 (not submitted yet).

Change-Id: I32b3365d5026600069291b068bbba6cb15295eb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/181378
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2019-06-10 16:19:39 +00:00
Keith Randall
49200e3f3e Revert "cmd/compile,runtime: allocate defer records on the stack" 
This reverts commit fff4f599fe.

Reason for revert: Seems to still have issues around GC.

Fixes #32452

Change-Id: Ibe7af629f9ad6a3d5312acd7b066123f484da7f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/180761
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2019-06-05 19:50:09 +00:00
Keith Randall
fff4f599fe cmd/compile,runtime: allocate defer records on the stack 
When a defer is executed at most once in a function body,
we can allocate the defer record for it on the stack instead
of on the heap.

This should make defers like this (which are very common) faster.

This optimization applies to 363 out of the 370 static defer sites
in the cmd/go binary.

name     old time/op  new time/op  delta
Defer-4  52.2ns ± 5%  36.2ns ± 3%  -30.70%  (p=0.000 n=10+10)

Fixes #6980
Update #14939

Change-Id: I697109dd7aeef9e97a9eeba2ef65ff53d3ee1004
Reviewed-on: https://go-review.googlesource.com/c/go/+/171758
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
 2019-06-04 17:35:20 +00:00
fanzha02
822a9f537f cmd/compile: fix the error of absorbing boolean tests into block(FGE, FGT) 
The CL 164718 mistyped the comparison flags. The rules for floating
point comparison should be GreaterThanF and GreaterEqualF. Fortunately,
the wrong optimizations were overwritten by other integer rules, so the
issue won't cause failure but just some performance impact.

The fixed CL optimizes the floating point test as follows.

source code: func foo(f float64) bool { return f > 4 || f < -4}
previous version: "FCMPD", "CSET\tGT", "CBZ"
fixed version: "FCMPD", BLE"

Add the test case.

Change-Id: Iea954fdbb8272b2d642dae0f816dc77286e6e1fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/177121
Reviewed-by: Ben Shi <powerman1st@163.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-05-16 13:46:25 +00:00
Michael Munday
2c1b5130aa cmd/compile: add math/bits.{Add,Sub}64 intrinsics on s390x 
This CL adds intrinsics for the 64-bit addition and subtraction
functions in math/bits. These intrinsics use the condition code
to propagate the carry or borrow bit.

To make the carry chains more efficient I've removed the
'clobberFlags' property from most of the load and store
operations. Originally these ops did clobber flags when using
offsets that didn't fit in a signed 20-bit integer, however
that is no longer true.

As with other platforms the intrinsics are faster when executed
in a chain rather than a loop because currently we need to spill
and restore the carry bit between each loop iteration. We may
be able to reduce the need to do this on s390x (e.g. by using
compare-and-branch instructions that do not clobber flags) in the
future.

name           old time/op  new time/op  delta
Add64          1.21ns ± 2%  2.03ns ± 2%  +67.18%  (p=0.000 n=7+10)
Add64multiple  2.98ns ± 3%  1.03ns ± 0%  -65.39%  (p=0.000 n=10+9)
Sub64          1.23ns ± 4%  2.03ns ± 1%  +64.85%  (p=0.000 n=10+10)
Sub64multiple  3.73ns ± 4%  1.04ns ± 1%  -72.28%  (p=0.000 n=10+8)

Change-Id: I913bbd5e19e6b95bef52f5bc4f14d6fe40119083
Reviewed-on: https://go-review.googlesource.com/c/go/+/174303
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-05-03 10:41:15 +00:00
Lynn Boger
e30aa166ea test: enable more memcombine tests for ppc64le 
This enables more of the testcases in memcombine for ppc64le,
and adds more detail to some existing.

Change-Id: Ic522a1175bed682b546909c96f9ea758f8db247c
Reviewed-on: https://go-review.googlesource.com/c/go/+/174737
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-05-01 14:27:27 +00:00
Brian Kessler
4d9dd35806 cmd/compile: add signed divisibility rules 
"Division by invariant integers using multiplication" paper
by Granlund and Montgomery contains a method for directly computing
divisibility (x%c == 0 for c constant) by means of the modular inverse.
The method is further elaborated in "Hacker's Delight" by Warren Section 10-17

This general rule can compute divisibilty by one multiplication, and add
and a compare for odd divisors and an additional rotate for even divisors.

To apply the divisibility rule, we must take into account
the rules to rewrite x%c = x-((x/c)*c) and (x/c) for c constant on the first
optimization pass "opt".  This complicates the matching as we want to match
only in the cases where the result of (x/c) is not also needed.
So, we must match on the expanded form of (x/c) in the expression x == c*(x/c)
in the "late opt" pass after common subexpresion elimination.

Note, that if there is an intermediate opt pass introduced in the future we
could simplify these rules by delaying the magic division rewrite to "late opt"
and matching directly on (x/c) in the intermediate opt pass.

On amd64, the divisibility check is 30-45% faster.

name                     old time/op  new time/op  delta`
DivisiblePow2constI64-4  0.83ns ± 1%  0.82ns ± 0%     ~     (p=0.079 n=5+4)
DivisibleconstI64-4      2.68ns ± 1%  1.87ns ± 0%  -30.33%  (p=0.000 n=5+4)
DivisibleWDivconstI64-4  2.69ns ± 1%  2.71ns ± 3%     ~     (p=1.000 n=5+5)
DivisiblePow2constI32-4  1.15ns ± 1%  1.15ns ± 0%     ~     (p=0.238 n=5+4)
DivisibleconstI32-4      2.24ns ± 1%  1.20ns ± 0%  -46.48%  (p=0.016 n=5+4)
DivisibleWDivconstI32-4  2.27ns ± 1%  2.27ns ± 1%     ~     (p=0.683 n=5+5)
DivisiblePow2constI16-4  0.81ns ± 1%  0.82ns ± 1%     ~     (p=0.135 n=5+5)
DivisibleconstI16-4      2.11ns ± 2%  1.20ns ± 1%  -42.99%  (p=0.008 n=5+5)
DivisibleWDivconstI16-4  2.23ns ± 0%  2.27ns ± 2%   +1.79%  (p=0.029 n=4+4)
DivisiblePow2constI8-4   0.81ns ± 1%  0.81ns ± 1%     ~     (p=0.286 n=5+5)
DivisibleconstI8-4       2.13ns ± 3%  1.19ns ± 1%  -43.84%  (p=0.008 n=5+5)
DivisibleWDivconstI8-4   2.23ns ± 1%  2.25ns ± 1%     ~     (p=0.183 n=5+5)

Fixes #30282
Fixes #15806

Change-Id: Id20d78263a4fdfe0509229ae4dfa2fede83fc1d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/173998
Run-TryBot: Brian Kessler <brian.m.kessler@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-04-30 22:02:07 +00:00
Carlos Eduardo Seo
50ad09418e cmd/compile: intrinsify math/bits.Add64 for ppc64x 
This change creates an intrinsic for Add64 for ppc64x and adds a
testcase for it.

name               old time/op  new time/op  delta
Add64-160          1.90ns ±40%  2.29ns ± 0%     ~     (p=0.119 n=5+5)
Add64multiple-160  6.69ns ± 2%  2.45ns ± 4%  -63.47%  (p=0.016 n=4+5)

Change-Id: I9abe6fb023fdf62eea3c9b46a1820f60bb0a7f97
Reviewed-on: https://go-review.googlesource.com/c/go/+/173758
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
 2019-04-28 23:51:04 +00:00
Brian Kessler
a28a942768 cmd/compile: add unsigned divisibility rules 
"Division by invariant integers using multiplication" paper
by Granlund and Montgomery contains a method for directly computing
divisibility (x%c == 0 for c constant) by means of the modular inverse.
The method is further elaborated in "Hacker's Delight" by Warren Section 10-17

This general rule can compute divisibilty by one multiplication and a compare
for odd divisors and an additional rotate for even divisors.

To apply the divisibility rule, we must take into account
the rules to rewrite x%c = x-((x/c)*c) and (x/c) for c constant on the first
optimization pass "opt".  This complicates the matching as we want to match
only in the cases where the result of (x/c) is not also available.
So, we must match on the expanded form of (x/c) in the expression x == c*(x/c)
in the "late opt" pass after common subexpresion elimination.

Note, that if there is an intermediate opt pass introduced in the future we
could simplify these rules by delaying the magic division rewrite to "late opt"
and matching directly on (x/c) in the intermediate opt pass.

Additional rules to lower the generic RotateLeft* ops were also applied.

On amd64, the divisibility check is 25-50% faster.

name                     old time/op  new time/op  delta
DivconstI64-4            2.08ns ± 0%  2.08ns ± 1%     ~     (p=0.881 n=5+5)
DivisibleconstI64-4      2.67ns ± 0%  2.67ns ± 1%     ~     (p=1.000 n=5+5)
DivisibleWDivconstI64-4  2.67ns ± 0%  2.67ns ± 0%     ~     (p=0.683 n=5+5)
DivconstU64-4            2.08ns ± 1%  2.08ns ± 1%     ~     (p=1.000 n=5+5)
DivisibleconstU64-4      2.77ns ± 1%  1.55ns ± 2%  -43.90%  (p=0.008 n=5+5)
DivisibleWDivconstU64-4  2.99ns ± 1%  2.99ns ± 1%     ~     (p=1.000 n=5+5)
DivconstI32-4            1.53ns ± 2%  1.53ns ± 0%     ~     (p=1.000 n=5+5)
DivisibleconstI32-4      2.23ns ± 0%  2.25ns ± 3%     ~     (p=0.167 n=5+5)
DivisibleWDivconstI32-4  2.27ns ± 1%  2.27ns ± 1%     ~     (p=0.429 n=5+5)
DivconstU32-4            1.78ns ± 0%  1.78ns ± 1%     ~     (p=1.000 n=4+5)
DivisibleconstU32-4      2.52ns ± 2%  1.26ns ± 0%  -49.96%  (p=0.000 n=5+4)
DivisibleWDivconstU32-4  2.63ns ± 0%  2.85ns ±10%   +8.29%  (p=0.016 n=4+5)
DivconstI16-4            1.54ns ± 0%  1.54ns ± 0%     ~     (p=0.333 n=4+5)
DivisibleconstI16-4      2.10ns ± 0%  2.10ns ± 1%     ~     (p=0.571 n=4+5)
DivisibleWDivconstI16-4  2.22ns ± 0%  2.23ns ± 1%     ~     (p=0.556 n=4+5)
DivconstU16-4            1.09ns ± 0%  1.01ns ± 1%   -7.74%  (p=0.000 n=4+5)
DivisibleconstU16-4      1.83ns ± 0%  1.26ns ± 0%  -31.52%  (p=0.008 n=5+5)
DivisibleWDivconstU16-4  1.88ns ± 0%  1.89ns ± 1%     ~     (p=0.365 n=5+5)
DivconstI8-4             1.54ns ± 1%  1.54ns ± 1%     ~     (p=1.000 n=5+5)
DivisibleconstI8-4       2.10ns ± 0%  2.11ns ± 0%     ~     (p=0.238 n=5+4)
DivisibleWDivconstI8-4   2.22ns ± 0%  2.23ns ± 2%     ~     (p=0.762 n=5+5)
DivconstU8-4             0.92ns ± 1%  0.94ns ± 1%   +2.65%  (p=0.008 n=5+5)
DivisibleconstU8-4       1.66ns ± 0%  1.26ns ± 1%  -24.28%  (p=0.008 n=5+5)
DivisibleWDivconstU8-4   1.79ns ± 0%  1.80ns ± 1%     ~     (p=0.079 n=4+5)

A follow-up change will address the signed division case.

Updates #30282

Change-Id: I7e995f167179aa5c76bb10fbcbeb49c520943403
Reviewed-on: https://go-review.googlesource.com/c/go/+/168037
Run-TryBot: Brian Kessler <brian.m.kessler@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-04-27 20:46:46 +00:00
Brian Kessler
44343c777c cmd/compile: add signed divisibility by power of 2 rules 
For powers of two (c=1<<k), the divisibility check x%c == 0 can be made
just by checking the trailing zeroes via a mask x&(c-1) == 0 even for signed
integers. This avoids division fix-ups when just divisibility check is needed.

To apply this rule, we match on the fixed-up version of the division. This is
neccessary because the mod and division rewrite rules are already applied
during the initial opt pass.

The speed up on amd64 due to elimination of unneccessary fix-up code is ~55%:

name                     old time/op  new time/op  delta
DivconstI64-4            2.08ns ± 0%  2.09ns ± 1%     ~     (p=0.730 n=5+5)
DivisiblePow2constI64-4  1.78ns ± 1%  0.81ns ± 1%  -54.66%  (p=0.008 n=5+5)
DivconstU64-4            2.08ns ± 0%  2.08ns ± 0%     ~     (p=0.683 n=5+5)
DivconstI32-4            1.53ns ± 0%  1.53ns ± 1%     ~     (p=0.968 n=4+5)
DivisiblePow2constI32-4  1.79ns ± 1%  0.81ns ± 1%  -54.97%  (p=0.008 n=5+5)
DivconstU32-4            1.78ns ± 1%  1.80ns ± 2%     ~     (p=0.206 n=5+5)
DivconstI16-4            1.54ns ± 2%  1.54ns ± 0%     ~     (p=0.238 n=5+4)
DivisiblePow2constI16-4  1.78ns ± 0%  0.81ns ± 1%  -54.72%  (p=0.000 n=4+5)
DivconstU16-4            1.00ns ± 5%  1.01ns ± 1%     ~     (p=0.119 n=5+5)
DivconstI8-4             1.54ns ± 0%  1.54ns ± 2%     ~     (p=0.571 n=4+5)
DivisiblePow2constI8-4   1.78ns ± 0%  0.82ns ± 8%  -53.71%  (p=0.008 n=5+5)
DivconstU8-4             0.93ns ± 1%  0.93ns ± 1%     ~     (p=0.643 n=5+5)

A follow-up CL will address the general case of x%c == 0 for signed integers.

Updates #15806

Change-Id: Iabadbbe369b6e0998c8ce85d038ebc236142e42a
Reviewed-on: https://go-review.googlesource.com/c/go/+/173557
Run-TryBot: Brian Kessler <brian.m.kessler@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-04-25 03:00:32 +00:00
Keith Randall
17615969b6 Revert "cmd/compile: add signed divisibility by power of 2 rules" 
This reverts CL 168038 (git 68819fb6d2)

Reason for revert: Doesn't work on 32 bit archs.

Change-Id: Idec9098060dc65bc2f774c5383f0477f8eb63a3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/173442
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2019-04-23 21:23:18 +00:00
Brian Kessler
68819fb6d2 cmd/compile: add signed divisibility by power of 2 rules 
For powers of two (c=1<<k), the divisibility check x%c == 0 can be made
just by checking the trailing zeroes via a mask x&(c-1)==0 even for signed
integers.  This avoids division fixups when just divisibility check is needed.

To apply this rule the generic divisibility rule for  A%B = A-(A/B*B) is disabled
on the "opt" pass, but this does not affect generated code as this rule is applied
later.

The speed up on amd64 due to elimination of unneccessary fixup code is ~55%:

name                     old time/op  new time/op  delta
DivconstI64-4            2.08ns ± 0%  2.07ns ± 0%     ~     (p=0.079 n=5+5)
DivisiblePow2constI64-4  1.78ns ± 1%  0.81ns ± 1%  -54.55%  (p=0.008 n=5+5)
DivconstU64-4            2.08ns ± 0%  2.08ns ± 0%     ~     (p=1.000 n=5+5)
DivconstI32-4            1.53ns ± 0%  1.53ns ± 0%     ~     (all equal)
DivisiblePow2constI32-4  1.79ns ± 1%  0.81ns ± 4%  -54.75%  (p=0.008 n=5+5)
DivconstU32-4            1.78ns ± 1%  1.78ns ± 1%     ~     (p=1.000 n=5+5)
DivconstI16-4            1.54ns ± 2%  1.53ns ± 0%     ~     (p=0.333 n=5+4)
DivisiblePow2constI16-4  1.78ns ± 0%  0.79ns ± 1%  -55.39%  (p=0.000 n=4+5)
DivconstU16-4            1.00ns ± 5%  0.99ns ± 1%     ~     (p=0.730 n=5+5)
DivconstI8-4             1.54ns ± 0%  1.53ns ± 0%     ~     (p=0.714 n=4+5)
DivisiblePow2constI8-4   1.78ns ± 0%  0.80ns ± 0%  -55.06%  (p=0.000 n=5+4)
DivconstU8-4             0.93ns ± 1%  0.95ns ± 1%   +1.72%  (p=0.024 n=5+5)

A follow-up CL will address the general case of x%c == 0 for signed integers.

Updates #15806

Change-Id: I0d284863774b1bc8c4ce87443bbaec6103e14ef4
Reviewed-on: https://go-review.googlesource.com/c/go/+/168038
Reviewed-by: Keith Randall <khr@golang.org>
 2019-04-23 20:35:54 +00:00
Keith Randall
fd788a86b6 cmd/compile: always mark atColumn1 results as statements 
In 31618, we end up comparing the is-stmt-ness of positions
to repurpose real instructions as inline marks. If the is-stmt-ness
doesn't match, we end up not being able to remove the inline mark.

Always use statement-full positions to do the matching, so we
always find a match if there is one.

Also always use positions that are statements for inline marks.

Fixes #31618

Change-Id: Idaf39bdb32fa45238d5cd52973cadf4504f947d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/173324
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>
 2019-04-23 17:39:11 +00:00
erifan01
f8f265b9cf cmd/compile: intrinsify math/bits.Sub64 for arm64 
This CL instrinsifies Sub64 with arm64 instruction sequence NEGS, SBCS,
NGC and NEG, and optimzes the case of borrowing chains.

Benchmarks:
name              old time/op       new time/op       delta
Sub-64            2.500000ns +- 0%  2.048000ns +- 1%  -18.08%  (p=0.000 n=10+10)
Sub32-64          2.500000ns +- 0%  2.500000ns +- 0%     ~     (all equal)
Sub64-64          2.500000ns +- 0%  2.080000ns +- 0%  -16.80%  (p=0.000 n=10+7)
Sub64multiple-64  7.090000ns +- 0%  2.090000ns +- 0%  -70.52%  (p=0.000 n=10+10)

Change-Id: I3d2664e009a9635e13b55d2c4567c7b34c2c0655
Reviewed-on: https://go-review.googlesource.com/c/go/+/159018
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-04-22 14:40:20 +00:00
Josh Bleecher Snyder
68d4b1265e cmd/compile: reduce bits.Div64(0, lo, y) to 64 bit division 
With this change, these two functions generate identical code:

func f(x uint64) (uint64, uint64) {
	return bits.Div64(0, x, 5)
}

func g(x uint64) (uint64, uint64) {
	return x / 5, x % 5
}

Updates #31582

Change-Id: Ia96c2e67f8af5dd985823afee5f155608c04a4b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/173197
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-04-20 19:34:03 +00:00
Keith Randall
48ef01051a cmd/compile: handle new panicindex/slice names in optimizations 
These new calls should not prevent NOSPLIT promotion, like the old ones.
These new calls should not prevent racefuncenter/exit removal.

(The latter was already true, as the new calls are not yet lowered
to StaticCalls at the point where racefuncenter/exit removal is done.)

Add tests to make sure we don't regress (again).

Fixes #31219

Change-Id: I3fb6b17cdd32c425829f1e2498defa813a5a9ace
Reviewed-on: https://go-review.googlesource.com/c/go/+/170639
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2019-04-03 21:24:17 +00:00
erifan01
d0cbf9bf53 cmd/compile: follow up intrinsifying math/bits.Add64 for arm64 
This CL deals with the additional comments of CL 159017.

Change-Id: I4ad3c60c834646d58dc0c544c741b92bfe83fb8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/168857
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-03-22 15:09:47 +00:00
Carlos Eduardo Seo
3023d7da49 cmd/compile/internal, cmd/internal/obj/ppc64: generate new count trailing zeros instructions on POWER9 
This change adds new POWER9 instructions for counting trailing zeros (CNTTZW/CNTTZD)
to the assembler and generates them in SSA when GOPPC64=power9.

name                 old time/op  new time/op  delta
TrailingZeros-160    1.59ns ±20%  1.45ns ±10%  -8.81%  (p=0.000 n=14+13)
TrailingZeros8-160   1.55ns ±23%  1.62ns ±44%    ~     (p=0.593 n=13+15)
TrailingZeros16-160  1.78ns ±23%  1.62ns ±38%  -9.31%  (p=0.003 n=14+14)
TrailingZeros32-160  1.64ns ±10%  1.49ns ± 9%  -9.15%  (p=0.000 n=13+14)
TrailingZeros64-160  1.53ns ± 6%  1.45ns ± 5%  -5.38%  (p=0.000 n=15+13)

Change-Id: I365e6ff79f3ce4d8ebe089a6a86b1771853eb596
Reviewed-on: https://go-review.googlesource.com/c/go/+/167517
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
 2019-03-20 20:27:00 +00:00
erifan01
5714c91b53 cmd/compile: intrinsify math/bits.Add64 for arm64 
This CL instrinsifies Add64 with arm64 instruction sequence ADDS, ADCS
and ADC, and optimzes the case of carry chains.The CL also changes the
test code so that the intrinsic implementation can be tested.

Benchmarks:
name               old time/op       new time/op       delta
Add-224            2.500000ns +- 0%  2.090000ns +- 4%  -16.40%  (p=0.000 n=9+10)
Add32-224          2.500000ns +- 0%  2.500000ns +- 0%     ~     (all equal)
Add64-224          2.500000ns +- 0%  1.577778ns +- 2%  -36.89%  (p=0.000 n=10+9)
Add64multiple-224  6.000000ns +- 0%  2.000000ns +- 0%  -66.67%  (p=0.000 n=10+10)

Change-Id: I6ee91c9a85c16cc72ade5fd94868c579f16c7615
Reviewed-on: https://go-review.googlesource.com/c/go/+/159017
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-03-20 05:39:49 +00:00
Josh Bleecher Snyder
250b96a7bf cmd/compile: slightly optimize adding 128 
'SUBQ $-0x80, r' is shorter to encode than 'ADDQ $0x80, r',
and functionally equivalent. Use it instead.

Shaves off a few bytes here and there:

file    before    after     Δ       %       
compile 25935856  25927664  -8192   -0.032% 
nm      4251840   4247744   -4096   -0.096% 

Change-Id: Ia9e02ea38cbded6a52a613b92e3a914f878d931e
Reviewed-on: https://go-review.googlesource.com/c/go/+/168344
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2019-03-19 19:44:52 +00:00
Keith Randall
2c423f063b cmd/compile,runtime: provide index information on bounds check failure 
A few examples (for accessing a slice of length 3):

   s[-1]    runtime error: index out of range [-1]
   s[3]     runtime error: index out of range [3] with length 3
   s[-1:0]  runtime error: slice bounds out of range [-1:]
   s[3:0]   runtime error: slice bounds out of range [3:0]
   s[3:-1]  runtime error: slice bounds out of range [:-1]
   s[3:4]   runtime error: slice bounds out of range [:4] with capacity 3
   s[0:3:4] runtime error: slice bounds out of range [::4] with capacity 3

Note that in cases where there are multiple things wrong with the
indexes (e.g. s[3:-1]), we report one of those errors kind of
arbitrarily, currently the rightmost one.

An exhaustive set of examples is in issue30116[u].out in the CL.

The message text has the same prefix as the old message text. That
leads to slightly awkward phrasing but hopefully minimizes the chance
that code depending on the error text will break.

Increases the size of the go binary by 0.5% (amd64). The panic functions
take arguments in registers in order to keep the size of the compiled code
as small as possible.

Fixes #30116

Change-Id: Idb99a827b7888822ca34c240eca87b7e44a04fdd
Reviewed-on: https://go-review.googlesource.com/c/go/+/161477
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
 2019-03-18 17:33:38 +00:00
Tobias Klauser
156c830bea cmd/compile: eliminate unnecessary type conversions in TrailingZeros(16|8) for arm 
This follows CL 156999 which did the same for arm64.

name               old time/op  new time/op  delta
TrailingZeros-4    7.30ns ± 1%  7.30ns ± 0%     ~     (p=0.413 n=9+9)
TrailingZeros8-4   8.32ns ± 0%  7.17ns ± 0%  -13.77%  (p=0.000 n=10+9)
TrailingZeros16-4  8.30ns ± 0%  7.18ns ± 0%  -13.50%  (p=0.000 n=9+10)
TrailingZeros32-4  6.46ns ± 1%  6.47ns ± 1%     ~     (p=0.325 n=10+10)
TrailingZeros64-4  16.3ns ± 0%  16.2ns ± 0%   -0.61%  (p=0.000 n=7+10)

Change-Id: I7e9e1abf7e30d811aa474d272b2824ec7cbbaa98
Reviewed-on: https://go-review.googlesource.com/c/go/+/167797
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-03-15 18:37:22 +00:00
Richard Musiol
5ee1b84959 math, math/bits: add intrinsics for wasm 
This commit adds compiler intrinsics for the packages math and
math/bits on the wasm architecture for better performance.

benchmark                        old ns/op     new ns/op     delta
BenchmarkCeil                    8.31          3.21          -61.37%
BenchmarkCopysign                5.24          3.88          -25.95%
BenchmarkAbs                     5.42          3.34          -38.38%
BenchmarkFloor                   8.29          3.18          -61.64%
BenchmarkRoundToEven             9.76          3.26          -66.60%
BenchmarkSqrtLatency             8.13          4.88          -39.98%
BenchmarkSqrtPrime               5246          3535          -32.62%
BenchmarkTrunc                   8.29          3.15          -62.00%
BenchmarkLeadingZeros            13.0          4.23          -67.46%
BenchmarkLeadingZeros8           4.65          4.42          -4.95%
BenchmarkLeadingZeros16          7.60          4.38          -42.37%
BenchmarkLeadingZeros32          10.7          4.48          -58.13%
BenchmarkLeadingZeros64          12.9          4.31          -66.59%
BenchmarkTrailingZeros           6.52          4.04          -38.04%
BenchmarkTrailingZeros8          4.57          4.14          -9.41%
BenchmarkTrailingZeros16         6.69          4.16          -37.82%
BenchmarkTrailingZeros32         6.97          4.23          -39.31%
BenchmarkTrailingZeros64         6.59          4.00          -39.30%
BenchmarkOnesCount               7.93          3.30          -58.39%
BenchmarkOnesCount8              3.56          3.19          -10.39%
BenchmarkOnesCount16             4.85          3.19          -34.23%
BenchmarkOnesCount32             7.27          3.19          -56.12%
BenchmarkOnesCount64             8.08          3.28          -59.41%
BenchmarkRotateLeft              4.88          3.80          -22.13%
BenchmarkRotateLeft64            5.03          3.63          -27.83%

Change-Id: Ic1e0c2984878be8defb6eb7eb6ee63765c793222
Reviewed-on: https://go-review.googlesource.com/c/go/+/165177
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-03-14 19:46:19 +00:00
Josh Bleecher Snyder
61945fc502 cmd/compile: don't generate panicshift for masked int shifts 
We know that a & 31 is non-negative for all a, signed or not.
We can avoid checking that and needing to write out an
unreachable call to panicshift.

Change-Id: I32f32fb2c950d2b2b35ac5c0e99b7b2dbd47f917
Reviewed-on: https://go-review.googlesource.com/c/go/+/167499
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-03-14 00:03:29 +00:00
Josh Bleecher Snyder
870cfe6484 test/codegen: gofmt 
Change-Id: I33f5b5051e5f75aa264ec656926223c5a3c09c1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/167498
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
 2019-03-13 21:44:45 +00:00
Keith Randall
486ca37b14 test: fix memcombine tests 
Two tests (load_le_byte8_uint64_inv and load_be_byte8_uint64)
pass but the generated code isn't actually correct.

The test regexp provides a false negative, as it matches the
MOVQ (SP), BP instruction in the epilogue.

Combined loads never worked for these cases - the test was added in error
as part of a batch and not noticed because of the above false match.

Normalize the amd64/386 tests to always negative match on narrower
loads and OR.

Change-Id: I256861924774d39db0e65723866c81df5ab5076f
Reviewed-on: https://go-review.googlesource.com/c/go/+/166837
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2019-03-11 19:18:03 +00:00
fanzha02
6efd51c6b7 cmd/compile: change the condition flags of floating-point comparisons in arm64 backend 
Current compiler reverses operands to work around NaN in
"less than" and "less equal than" comparisons. But if we
want to use "FCMPD/FCMPS $(0.0), Fn" to do some optimization,
the workaround way does not work. Because assembler does
not support instruction "FCMPD/FCMPS Fn, $(0.0)".

This CL sets condition flags for floating-point comparisons
to resolve this problem.

Change-Id: Ia48076a1da95da64596d6e68304018cb301ebe33
Reviewed-on: https://go-review.googlesource.com/c/go/+/164718
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-03-07 21:23:52 +00:00
erifan01
4e2b0dda8c cmd/compile: eliminate unnecessary type conversions in TrailingZeros(16|8) for arm64 
This CL eliminates unnecessary type conversion operations: OpZeroExt16to64 and OpZeroExt8to64.
If the input argrument is a nonzero value, then ORconst operation can also be eliminated.

Benchmarks:

name               old time/op  new time/op  delta
TrailingZeros-8    2.75ns ± 0%  2.75ns ± 0%     ~     (all equal)
TrailingZeros8-8   3.49ns ± 1%  2.93ns ± 0%  -16.00%  (p=0.000 n=10+10)
TrailingZeros16-8  3.49ns ± 1%  2.93ns ± 0%  -16.05%  (p=0.000 n=9+10)
TrailingZeros32-8  2.67ns ± 1%  2.68ns ± 1%     ~     (p=0.468 n=10+10)
TrailingZeros64-8  2.67ns ± 1%  2.65ns ± 0%   -0.62%  (p=0.022 n=10+9)

code:

func f16(x uint) { z = bits.TrailingZeros16(uint16(x)) }

Before:

"".f16 STEXT size=48 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f16(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0000 00000 (test.go:7)        FUNCDATA        ZR, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        FUNCDATA        $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        FUNCDATA        $3, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        PCDATA  $2, ZR
        0x0000 00000 (test.go:7)        PCDATA  ZR, ZR
        0x0000 00000 (test.go:7)        MOVD    "".x(FP), R0
        0x0004 00004 (test.go:7)        MOVHU   R0, R0
        0x0008 00008 (test.go:7)        ORR     $65536, R0, R0
        0x000c 00012 (test.go:7)        RBIT    R0, R0
        0x0010 00016 (test.go:7)        CLZ     R0, R0
        0x0014 00020 (test.go:7)        MOVD    R0, "".z(SB)
        0x0020 00032 (test.go:7)        RET     (R30)

This line of code is unnecessary:
        0x0004 00004 (test.go:7)        MOVHU   R0, R0

After:

"".f16 STEXT size=32 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f16(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0000 00000 (test.go:7)        FUNCDATA        ZR, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        FUNCDATA        $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        FUNCDATA        $3, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (test.go:7)        PCDATA  $2, ZR
        0x0000 00000 (test.go:7)        PCDATA  ZR, ZR
        0x0000 00000 (test.go:7)        MOVD    "".x(FP), R0
        0x0004 00004 (test.go:7)        ORR     $65536, R0, R0
        0x0008 00008 (test.go:7)        RBITW   R0, R0
        0x000c 00012 (test.go:7)        CLZW    R0, R0
        0x0010 00016 (test.go:7)        MOVD    R0, "".z(SB)
        0x001c 00028 (test.go:7)        RET     (R30)

The situation of TrailingZeros8 is similar to TrailingZeros16.

Change-Id: I473bdca06be8460a0be87abbae6fe640017e4c9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/156999
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-03-07 14:24:56 +00:00
erifan01
fee84cc905 cmd/compile: add an optimization rule for math/bits.ReverseBytes16 on arm 
This CL adds two rules to turn patterns like ((x<<8) | (x>>8)) (the type of
x is uint16, "|" can also be "+" or "^") to a REV16 instruction on arm v6+.
This optimization rule can be used for math/bits.ReverseBytes16.

Benchmarks on arm v6:
name               old time/op  new time/op  delta
ReverseBytes-32    2.86ns ± 0%  2.86ns ± 0%   ~     (all equal)
ReverseBytes16-32  2.86ns ± 0%  2.86ns ± 0%   ~     (all equal)
ReverseBytes32-32  1.29ns ± 0%  1.29ns ± 0%   ~     (all equal)
ReverseBytes64-32  1.43ns ± 0%  1.43ns ± 0%   ~     (all equal)

Change-Id: I819e633c9a9d308f8e476fb0c82d73fb73dd019f
Reviewed-on: https://go-review.googlesource.com/c/go/+/159019
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-03-07 13:37:54 +00:00
erifan01
159b2de442 cmd/compile: optimize math/bits.Div32 for arm64 
Benchmark:
name     old time/op  new time/op  delta
Div-8    22.0ns ± 0%  22.0ns ± 0%     ~     (all equal)
Div32-8  6.51ns ± 0%  3.00ns ± 0%  -53.90%  (p=0.000 n=10+8)
Div64-8  22.5ns ± 0%  22.5ns ± 0%     ~     (all equal)

Code:
func div32(hi, lo, y uint32) (q, r uint32) {return bits.Div32(hi, lo, y)}

Before:
        0x0020 00032 (test.go:24)       MOVWU   "".y+8(FP), R0
        0x0024 00036 ($GOROOT/src/math/bits/bits.go:472)        CBZW    R0, 132
        0x0028 00040 ($GOROOT/src/math/bits/bits.go:472)        MOVWU   "".hi(FP), R1
        0x002c 00044 ($GOROOT/src/math/bits/bits.go:472)        CMPW    R1, R0
        0x0030 00048 ($GOROOT/src/math/bits/bits.go:472)        BLS     96
        0x0034 00052 ($GOROOT/src/math/bits/bits.go:475)        MOVWU   "".lo+4(FP), R2
        0x0038 00056 ($GOROOT/src/math/bits/bits.go:475)        ORR     R1<<32, R2, R1
        0x003c 00060 ($GOROOT/src/math/bits/bits.go:476)        CBZ     R0, 140
        0x0040 00064 ($GOROOT/src/math/bits/bits.go:476)        UDIV    R0, R1, R2
        0x0044 00068 (test.go:24)       MOVW    R2, "".q+16(FP)
        0x0048 00072 ($GOROOT/src/math/bits/bits.go:476)        UREM    R0, R1, R0
        0x0050 00080 (test.go:24)       MOVW    R0, "".r+20(FP)
        0x0054 00084 (test.go:24)       MOVD    -8(RSP), R29
        0x0058 00088 (test.go:24)       MOVD.P  32(RSP), R30
        0x005c 00092 (test.go:24)       RET     (R30)

After:
        0x001c 00028 (test.go:24)       MOVWU   "".y+8(FP), R0
        0x0020 00032 (test.go:24)       CBZW    R0, 92
        0x0024 00036 (test.go:24)       MOVWU   "".hi(FP), R1
        0x0028 00040 (test.go:24)       CMPW    R0, R1
        0x002c 00044 (test.go:24)       BHS     84
        0x0030 00048 (test.go:24)       MOVWU   "".lo+4(FP), R2
        0x0034 00052 (test.go:24)       ORR     R1<<32, R2, R4
        0x0038 00056 (test.go:24)       UDIV    R0, R4, R3
        0x003c 00060 (test.go:24)       MSUB    R3, R4, R0, R4
        0x0040 00064 (test.go:24)       MOVW    R3, "".q+16(FP)
        0x0044 00068 (test.go:24)       MOVW    R4, "".r+20(FP)
        0x0048 00072 (test.go:24)       MOVD    -8(RSP), R29
        0x004c 00076 (test.go:24)       MOVD.P  16(RSP), R30
        0x0050 00080 (test.go:24)       RET     (R30)

UREM instruction in the previous assembly code will be converted to UDIV and MSUB instructions
on arm64. However the UDIV instruction in UREM is unnecessary, because it's a duplicate of the
previous UDIV. This CL adds a rule to have this extra UDIV instruction removed by CSE.

Change-Id: Ie2508784320020b2de022806d09f75a7871bb3d7
Reviewed-on: https://go-review.googlesource.com/c/159577
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-03-03 20:20:10 +00:00
erifan01
192b675f17 cmd/compile: add an optimaztion rule for math/bits.ReverseBytes16 on arm64 
On amd64 ReverseBytes16 is lowered to a rotate instruction. However arm64 doesn't
have 16-bit rotate instruction, but has a REV16W instruction which can be used
for ReverseBytes16. This CL adds a rule to turn the patterns like (x<<8) | (x>>8)
(the type of x is uint16, and "|" can also be "^" or "+") to a REV16W instruction.

Code:
func reverseBytes16(i uint16) uint16 { return bits.ReverseBytes16(i) }

Before:
        0x0004 00004 (test.go:6)        MOVHU   "".i(FP), R0
        0x0008 00008 ($GOROOT/src/math/bits/bits.go:262)        UBFX    $8, R0, $8, R1
        0x000c 00012 ($GOROOT/src/math/bits/bits.go:262)        ORR     R0<<8, R1, R0
        0x0010 00016 (test.go:6)        MOVH    R0, "".~r1+8(FP)
        0x0014 00020 (test.go:6)        RET     (R30)

After:
        0x0000 00000 (test.go:6)        MOVHU   "".i(FP), R0
        0x0004 00004 (test.go:6)        REV16W  R0, R0
        0x0008 00008 (test.go:6)        MOVH    R0, "".~r1+8(FP)
        0x000c 00012 (test.go:6)        RET     (R30)

Benchmarks:
name                old time/op       new time/op       delta
ReverseBytes-224    1.000000ns +- 0%  1.000000ns +- 0%     ~     (all equal)
ReverseBytes16-224  1.500000ns +- 0%  1.000000ns +- 0%  -33.33%  (p=0.000 n=9+10)
ReverseBytes32-224  1.000000ns +- 0%  1.000000ns +- 0%     ~     (all equal)
ReverseBytes64-224  1.000000ns +- 0%  1.000000ns +- 0%     ~     (all equal)

Change-Id: I87cd41b2d8e549bf39c601f185d5775bd42d739c
Reviewed-on: https://go-review.googlesource.com/c/157757
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2019-03-01 15:42:19 +00:00
erifan01
dd91269b7c cmd/compile: optimize math/bits Len32 intrinsic on arm64 
Arm64 has a 32-bit CLZ instruction CLZW, which can be used for intrinsic Len32.
Function LeadingZeros32 calls Len32, with this change, the assembly code of
LeadingZeros32 becomes more concise.

Go code:

func f32(x uint32) { z = bits.LeadingZeros32(x) }

Before:

"".f32 STEXT size=32 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f32(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0004 00004 (test.go:7)        MOVWU   "".x(FP), R0
        0x0008 00008 ($GOROOT/src/math/bits/bits.go:30) CLZ     R0, R0
        0x000c 00012 ($GOROOT/src/math/bits/bits.go:30) SUB     $32, R0, R0
        0x0010 00016 (test.go:7)        MOVD    R0, "".z(SB)
        0x001c 00028 (test.go:7)        RET     (R30)

After:

"".f32 STEXT size=32 args=0x8 locals=0x0 leaf
        0x0000 00000 (test.go:7)        TEXT    "".f32(SB), LEAF|NOFRAME|ABIInternal, $0-8
        0x0004 00004 (test.go:7)        MOVWU   "".x(FP), R0
        0x0008 00008 ($GOROOT/src/math/bits/bits.go:30) CLZW    R0, R0
        0x000c 00012 (test.go:7)        MOVD    R0, "".z(SB)
        0x0018 00024 (test.go:7)        RET     (R30)

Benchmarks:
name              old time/op  new time/op  delta
LeadingZeros-8    2.53ns ± 0%  2.55ns ± 0%   +0.67%  (p=0.000 n=10+10)
LeadingZeros8-8   3.56ns ± 0%  3.56ns ± 0%     ~     (all equal)
LeadingZeros16-8  3.55ns ± 0%  3.56ns ± 0%     ~     (p=0.465 n=10+10)
LeadingZeros32-8  3.55ns ± 0%  2.96ns ± 0%  -16.71%  (p=0.000 n=10+7)
LeadingZeros64-8  2.53ns ± 0%  2.54ns ± 0%     ~     (p=0.059 n=8+10)

Change-Id: Ie5666bb82909e341060e02ffd4e86c0e5d67e90a
Reviewed-on: https://go-review.googlesource.com/c/157000
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2019-02-27 16:09:33 +00:00
Iskander Sharipov
c1050a8e54 cmd/compile: don't generate newobject call for 0-sized types 
Emit &runtime.zerobase instead of a call to newobject for
allocations of zero sized objects in walk.go.

Fixes #29446

Change-Id: I11b67981d55009726a17c2e582c12ce0c258682e
Reviewed-on: https://go-review.googlesource.com/c/155840
Run-TryBot: Iskander Sharipov <quasilyte@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2019-02-26 23:08:15 +00:00
Keith Randall
933e34ac99 cmd/compile: treat slice pointers as non-nil 
var a []int = ...
p := &a[0]
_ = *p

We don't need to nil check on the 3rd line. If the bounds check on the 2nd
line passes, we know p is non-nil.

We rely on the fact that any cap>0 slice has a non-nil pointer as its
pointer to the backing array. This is true for all safely-constructed slices,
and I don't see any reason why someone would violate this rule using unsafe.

R=go1.13

Fixes #30366

Change-Id: I3ed764fcb72cfe1fbf963d8c1a82e24e3b6dead7
Reviewed-on: https://go-review.googlesource.com/c/163740
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2019-02-26 20:44:52 +00:00
Keith Randall
c5414457c6 cmd/compile: pad zero-sized stack variables 
If someone takes a pointer to a zero-sized stack variable, it can
be incorrectly interpreted as a pointer to the next object in the
stack frame. To avoid this, add some padding after zero-sized variables.

We only need to pad if the next variable in memory (which is the
previous variable in the order in which we allocate variables to the
stack frame) has pointers. If the next variable has no pointers, it
won't hurt to have a pointer to it.

Because we allocate all pointer-containing variables before all
non-pointer-containing variables, we should only have to pad once per
frame.

Fixes #24993

Change-Id: Ife561cdfdf964fdbf69af03ae6ba97d004e6193c
Reviewed-on: https://go-review.googlesource.com/c/155698
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-12-22 01:16:00 +00:00
Ben Shi
c042fedbc8 test/codegen: add arithmetic tests for 386/amd64/arm/arm64 
This CL adds several test cases of arithmetic operations for
386/amd64/arm/arm64.

Change-Id: I362687c06249f31091458a1d8c45fc4d006b616a
Reviewed-on: https://go-review.googlesource.com/c/151897
Run-TryBot: Ben Shi <powerman1st@163.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-12-01 05:17:44 +00:00
Keith Randall
0b79dde112 cmd/compile: don't use CMOV ops to compute load addresses 
We want to issue loads as soon as possible, especially when they
are going to miss in the cache. Using a conditional move (CMOV) here:

i := ...
if cond {
   i++
}
... = a[i]

means that we have to wait for cond to be computed before the load
is issued. Without a CMOV, if the branch is predicted correctly the
load can be issued in parallel with computing cond.
Even if the branch is predicted incorrectly, maybe the speculative
load is close to the real load, and we get a prefetch for free.
In the worst case, when the prediction is wrong and the address is
way off, we only lose by the time difference between the CMOV
latency (~2 cycles) and the mispredict restart latency (~15 cycles).

We only squash CMOVs that affect load addresses. Results of CMOVs
that are used for other things (store addresses, store values) we
use as before.

Fixes #26306

Change-Id: I82ca14b664bf05e1d45e58de8c4d9c775a127ca1
Reviewed-on: https://go-review.googlesource.com/c/145717
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2018-11-27 17:22:37 +00:00
Brian Kessler
319787a528 cmd/compile: intrinsify math/bits.Div on amd64 
Note that the intrinsic implementation panics separately for overflow and
divide by zero, which matches the behavior of the pure go implementation.
There is a modest performance improvement after intrinsic implementation.

name     old time/op  new time/op  delta
Div-4    53.0ns ± 1%  47.0ns ± 0%  -11.28%  (p=0.008 n=5+5)
Div32-4  18.4ns ± 0%  18.5ns ± 1%     ~     (p=0.444 n=5+5)
Div64-4  53.3ns ± 0%  47.5ns ± 4%  -10.77%  (p=0.008 n=5+5)

Updates #28273

Change-Id: Ic1688ecc0964acace2e91bf44ef16f5fb6b6bc82
Reviewed-on: https://go-review.googlesource.com/c/144378
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-11-27 05:04:25 +00:00
Martin Möhrmann
75798e8ada runtime: make processor capability variable naming platform specific 
The current support_XXX variables are specific for the
amd64 and 386 platforms.

Prefix processor capability variables by architecture to have a
consistent naming scheme and avoid reuse of the existing
variables for new platforms.

This also aligns naming of runtime variables closer with internal/cpu
processor capability variable names.

Change-Id: I3eabb29a03874678851376185d3a62e73c1aff1d
Reviewed-on: https://go-review.googlesource.com/c/91435
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-11-14 20:30:31 +00:00
Lynn Boger
4ae49b5921 cmd/compile: use ANDCC, ORCC, XORCC to avoid CMP on ppc64x 
This change makes use of the cc versions of the AND, OR, XOR
instructions, omitting the need for a CMP instruction.

In many test programs and in the go binary, this reduces the
size of 20-30 functions by at least 1 instruction, many in
runtime.

Testcase added to test/codegen/comparisons.go

Change-Id: I6cc1ca8b80b065d7390749c625bc9784b0039adb
Reviewed-on: https://go-review.googlesource.com/c/143059
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-11-09 19:40:52 +00:00
Keith Randall
0ad332d80c cmd/compile: implement some moves using non-overlapping reads&writes 
For moves >8,<16 bytes, do a move using non-overlapping loads/stores
if it would require no more instructions.

This helps a bit with the case when the move is from a static
constant, because then the code to materialize the value being moved
is smaller.

Change-Id: Ie47a5a7c654afeb4973142b0a9922faea13c9b54
Reviewed-on: https://go-review.googlesource.com/c/146019
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-10-30 20:27:03 +00:00
Ben Shi
455ef3f6bc test/codegen: improve arithmetic tests 
This CL fixes several typos and adds two more cases
to arithmetic test.

Change-Id: I086560162ea351e2166866e444e2317da36c1729
Reviewed-on: https://go-review.googlesource.com/c/145210
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-10-30 14:39:53 +00:00
Ben Shi
5f5ea3fd4d cmd/compile: optimize amd64's ADDQconstmodify/ADDLconstmodify 
This CL optimize amd64's code:
"ADDQ $-1, MEM_OP" -> "DECQ MEM_OP"
"ADDL $-1, MEM_OP" -> "DECL MEM_OP"

1. The total size of pkg/linux_amd64 (excluding cmd/compile)
decreases about 0.1KB.

2. The go1 benchmark shows little regression, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              2.60s ± 5%     2.64s ± 3%  +1.53%  (p=0.000 n=38+39)
Fannkuch11-4                2.37s ± 2%     2.38s ± 2%    ~     (p=0.950 n=40+40)
FmtFprintfEmpty-4          40.4ns ± 5%    40.5ns ± 5%    ~     (p=0.711 n=40+40)
FmtFprintfString-4         72.4ns ± 5%    72.3ns ± 3%    ~     (p=0.485 n=40+40)
FmtFprintfInt-4            79.7ns ± 3%    80.1ns ± 3%    ~     (p=0.124 n=40+40)
FmtFprintfIntInt-4          126ns ± 3%     127ns ± 3%  +0.71%  (p=0.027 n=40+40)
FmtFprintfPrefixedInt-4     153ns ± 4%     153ns ± 2%    ~     (p=0.604 n=40+40)
FmtFprintfFloat-4           206ns ± 5%     210ns ± 5%  +1.79%  (p=0.002 n=40+40)
FmtManyArgs-4               498ns ± 3%     496ns ± 3%    ~     (p=0.099 n=40+40)
GobDecode-4                6.48ms ± 6%    6.47ms ± 7%    ~     (p=0.686 n=39+40)
GobEncode-4                5.95ms ± 7%    5.96ms ± 6%    ~     (p=0.670 n=40+34)
Gzip-4                      224ms ± 6%     223ms ± 5%    ~     (p=0.143 n=40+40)
Gunzip-4                   36.5ms ± 4%    36.5ms ± 4%    ~     (p=0.556 n=40+40)
HTTPClientServer-4         60.7µs ± 2%    59.9µs ± 3%  -1.20%  (p=0.000 n=39+39)
JSONEncode-4               9.03ms ± 4%    9.04ms ± 4%    ~     (p=0.589 n=40+40)
JSONDecode-4               49.4ms ± 4%    49.2ms ± 4%    ~     (p=0.276 n=40+40)
Mandelbrot200-4            3.80ms ± 4%    3.79ms ± 4%    ~     (p=0.837 n=40+40)
GoParse-4                  3.15ms ± 5%    3.13ms ± 5%    ~     (p=0.240 n=40+40)
RegexpMatchEasy0_32-4      72.9ns ± 3%    72.0ns ± 8%  -1.25%  (p=0.003 n=40+40)
RegexpMatchEasy0_1K-4       229ns ± 5%     230ns ± 4%    ~     (p=0.318 n=40+40)
RegexpMatchEasy1_32-4      66.9ns ± 3%    67.3ns ± 7%    ~     (p=0.817 n=40+40)
RegexpMatchEasy1_1K-4       371ns ± 5%     370ns ± 4%    ~     (p=0.275 n=40+40)
RegexpMatchMedium_32-4      106ns ± 4%     104ns ± 7%  -2.28%  (p=0.000 n=40+40)
RegexpMatchMedium_1K-4     32.0µs ± 2%    31.4µs ± 3%  -2.08%  (p=0.000 n=40+40)
RegexpMatchHard_32-4       1.54µs ± 7%    1.52µs ± 3%  -1.80%  (p=0.007 n=39+40)
RegexpMatchHard_1K-4       45.8µs ± 4%    45.5µs ± 3%    ~     (p=0.707 n=40+40)
Revcomp-4                   401ms ± 5%     401ms ± 6%    ~     (p=0.935 n=40+40)
Template-4                 62.4ms ± 4%    61.2ms ± 3%  -1.85%  (p=0.000 n=40+40)
TimeParse-4                 315ns ± 2%     318ns ± 3%  +1.10%  (p=0.002 n=40+40)
TimeFormat-4                297ns ± 3%     298ns ± 3%    ~     (p=0.238 n=40+40)
[Geo mean]                 45.8µs         45.7µs       -0.22%

name                     old speed      new speed      delta
GobDecode-4               119MB/s ± 6%   119MB/s ± 7%    ~     (p=0.684 n=39+40)
GobEncode-4               129MB/s ± 7%   128MB/s ± 6%    ~     (p=0.413 n=40+34)
Gzip-4                   86.6MB/s ± 6%  87.0MB/s ± 6%    ~     (p=0.145 n=40+40)
Gunzip-4                  532MB/s ± 4%   532MB/s ± 4%    ~     (p=0.556 n=40+40)
JSONEncode-4              215MB/s ± 4%   215MB/s ± 4%    ~     (p=0.583 n=40+40)
JSONDecode-4             39.3MB/s ± 4%  39.5MB/s ± 4%    ~     (p=0.277 n=40+40)
GoParse-4                18.4MB/s ± 5%  18.5MB/s ± 5%    ~     (p=0.229 n=40+40)
RegexpMatchEasy0_32-4     439MB/s ± 3%   445MB/s ± 8%  +1.28%  (p=0.003 n=40+40)
RegexpMatchEasy0_1K-4    4.46GB/s ± 4%  4.45GB/s ± 4%    ~     (p=0.343 n=40+40)
RegexpMatchEasy1_32-4     479MB/s ± 3%   476MB/s ± 7%    ~     (p=0.855 n=40+40)
RegexpMatchEasy1_1K-4    2.76GB/s ± 5%  2.77GB/s ± 4%    ~     (p=0.250 n=40+40)
RegexpMatchMedium_32-4   9.36MB/s ± 4%  9.58MB/s ± 6%  +2.31%  (p=0.001 n=40+40)
RegexpMatchMedium_1K-4   32.0MB/s ± 2%  32.7MB/s ± 3%  +2.12%  (p=0.000 n=40+40)
RegexpMatchHard_32-4     20.7MB/s ± 7%  21.1MB/s ± 3%  +1.95%  (p=0.005 n=40+40)
RegexpMatchHard_1K-4     22.4MB/s ± 4%  22.5MB/s ± 3%    ~     (p=0.689 n=40+40)
Revcomp-4                 634MB/s ± 5%   634MB/s ± 6%    ~     (p=0.935 n=40+40)
Template-4               31.1MB/s ± 3%  31.7MB/s ± 3%  +1.88%  (p=0.000 n=40+40)
[Geo mean]                129MB/s        130MB/s       +0.62%

Change-Id: I9d61ee810d900920c572cbe89e2f1626bfed12b7
Reviewed-on: https://go-review.googlesource.com/c/145209
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-30 00:22:58 +00:00
Keith Randall
9f291d1fc3 cmd/compile: fix rule for combining loads with compares 
Unlike normal load+op opcodes, the load+compare opcode does
not clobber its non-load argument. Allow the load+compare merge
to happen even if the non-load argument is used elsewhere.

Noticed when investigating issue #28417.

Change-Id: Ibc48d1f2e06ae76034c59f453815d263e8ec7288
Reviewed-on: https://go-review.googlesource.com/c/145097
Reviewed-by: Ainar Garipov <gugl.zadolbal@gmail.com>
Reviewed-by: Ben Shi <powerman1st@163.com>
 2018-10-27 00:59:54 +00:00
Keith Randall
dd789550a7 cmd/compile: intrinsify math/bits.Sub on amd64 
name             old time/op  new time/op  delta
Sub-8            1.12ns ± 1%  1.17ns ± 1%   +5.20%          (p=0.008 n=5+5)
Sub32-8          1.11ns ± 0%  1.11ns ± 0%     ~     (all samples are equal)
Sub64-8          1.12ns ± 0%  1.18ns ± 1%   +5.00%          (p=0.016 n=4+5)
Sub64multiple-8  4.10ns ± 1%  0.86ns ± 1%  -78.93%          (p=0.008 n=5+5)

Fixes #28273

Change-Id: Ibcb6f2fd32d987c3bcbae4f4cd9d335a3de98548
Reviewed-on: https://go-review.googlesource.com/c/144258
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-10-25 19:47:27 +00:00
Keith Randall
899f3a2892 cmd/compile: intrinsify math/bits.Add on amd64 
name             old time/op  new time/op  delta
Add-8            1.11ns ± 0%  1.18ns ± 0%   +6.31%  (p=0.029 n=4+4)
Add32-8          1.02ns ± 0%  1.02ns ± 1%     ~     (p=0.333 n=4+5)
Add64-8          1.11ns ± 1%  1.17ns ± 0%   +5.79%  (p=0.008 n=5+5)
Add64multiple-8  4.35ns ± 1%  0.86ns ± 0%  -80.22%  (p=0.000 n=5+4)

The individual ops are a bit slower (but still very fast).
Using the ops in carry chains is very fast.

Update #28273

Change-Id: Id975f76df2b930abf0e412911d327b6c5b1befe5
Reviewed-on: https://go-review.googlesource.com/c/144257
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-10-25 19:47:00 +00:00
ChrisALiles
13d5cd7847 cmd/compile: use proved bounds to remove signed division fix-ups 
prove is able to find 94 occurrences in std cmd where a divisor
can't have the value -1. The change removes
the extraneous fix-up code for these cases.

Fixes #25239

Change-Id: Ic184de971f47cc57c702eb72805b8e291c14035d
Reviewed-on: https://go-review.googlesource.com/c/130215
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-23 02:29:44 +00:00
Ben Shi
95dda75bde cmd/compile: optimize store combination on 386/amd64 
This CL add 3 rules to combine byte-store to word-store on386 and
amd64.

Change-Id: Iffd9cda42f1961680c81def4edc773ad58f211b3
Reviewed-on: https://go-review.googlesource.com/c/143057
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-19 02:21:04 +00:00
Ben Shi
4158734097 test/codegen: add more combined load/store test cases 
This CL adds more combined load/store test cases for 386/amd64.

Change-Id: I0a483a6ed0212b65c5e84d67ed8c9f50c389ce2d
Reviewed-on: https://go-review.googlesource.com/c/142878
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-18 01:57:54 +00:00
Lynn Boger
39fa301bdc test/codegen: enable more tests for ppc64/ppc64le 
Adding cases for ppc64,ppc64le to the codegen tests
where appropriate.

Change-Id: Idf8cbe88a4ab4406a4ef1ea777bd15a58b68f3ed
Reviewed-on: https://go-review.googlesource.com/c/142557
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-10-16 19:00:53 +00:00
Ben Shi
4b78fe57a8 cmd/compile: optimize 386's load/store combination 
This CL adds more combinations of two consequtive MOVBload/MOVBstore
to a unique MOVWload/MOVWstore.

1. The size of the go executable decreases about 4KB, and the total
size of pkg/linux_386 (excluding cmd/compile) decreases about 1.5KB.

2. There is no regression in the go1 benchmark result, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.28s ± 2%     3.29s ± 2%    ~     (p=0.151 n=40+40)
Fannkuch11-4                3.52s ± 1%     3.51s ± 1%  -0.28%  (p=0.002 n=40+40)
FmtFprintfEmpty-4          45.4ns ± 4%    45.0ns ± 4%  -0.89%  (p=0.019 n=40+40)
FmtFprintfString-4         81.9ns ± 7%    81.3ns ± 1%    ~     (p=0.660 n=40+25)
FmtFprintfInt-4            91.9ns ± 9%    91.4ns ± 9%    ~     (p=0.249 n=40+40)
FmtFprintfIntInt-4          143ns ± 4%     143ns ± 4%    ~     (p=0.760 n=40+40)
FmtFprintfPrefixedInt-4     184ns ± 3%     183ns ± 4%    ~     (p=0.485 n=40+40)
FmtFprintfFloat-4           408ns ± 3%     409ns ± 3%    ~     (p=0.961 n=40+40)
FmtManyArgs-4               597ns ± 4%     602ns ± 3%    ~     (p=0.413 n=40+40)
GobDecode-4                7.13ms ± 6%    7.14ms ± 6%    ~     (p=0.859 n=40+40)
GobEncode-4                6.86ms ± 9%    6.94ms ± 7%    ~     (p=0.162 n=40+40)
Gzip-4                      395ms ± 4%     396ms ± 3%    ~     (p=0.099 n=40+40)
Gunzip-4                   40.9ms ± 4%    41.1ms ± 3%    ~     (p=0.064 n=40+40)
HTTPClientServer-4         63.6µs ± 2%    63.6µs ± 3%    ~     (p=0.832 n=36+39)
JSONEncode-4               16.1ms ± 3%    15.8ms ± 3%  -1.60%  (p=0.001 n=40+40)
JSONDecode-4               61.0ms ± 3%    61.5ms ± 4%    ~     (p=0.065 n=40+40)
Mandelbrot200-4            5.16ms ± 3%    5.18ms ± 3%    ~     (p=0.056 n=40+40)
GoParse-4                  3.25ms ± 2%    3.23ms ± 3%    ~     (p=0.727 n=40+40)
RegexpMatchEasy0_32-4      90.2ns ± 3%    89.3ns ± 6%  -0.98%  (p=0.002 n=40+40)
RegexpMatchEasy0_1K-4       812ns ± 3%     815ns ± 3%    ~     (p=0.309 n=40+40)
RegexpMatchEasy1_32-4       103ns ± 6%     103ns ± 5%    ~     (p=0.680 n=40+40)
RegexpMatchEasy1_1K-4      1.01µs ± 4%    1.02µs ± 3%    ~     (p=0.326 n=40+33)
RegexpMatchMedium_32-4      120ns ± 4%     120ns ± 5%    ~     (p=0.834 n=40+40)
RegexpMatchMedium_1K-4     40.1µs ± 3%    39.5µs ± 4%  -1.35%  (p=0.000 n=40+40)
RegexpMatchHard_32-4       2.27µs ± 6%    2.23µs ± 4%  -1.67%  (p=0.011 n=40+40)
RegexpMatchHard_1K-4       67.2µs ± 3%    67.2µs ± 3%    ~     (p=0.149 n=40+40)
Revcomp-4                   1.84s ± 2%     1.86s ± 3%  +0.70%  (p=0.020 n=40+40)
Template-4                 69.0ms ± 4%    69.8ms ± 3%  +1.20%  (p=0.003 n=40+40)
TimeParse-4                 438ns ± 3%     439ns ± 4%    ~     (p=0.650 n=40+40)
TimeFormat-4                412ns ± 3%     412ns ± 3%    ~     (p=0.888 n=40+40)
[Geo mean]                 65.2µs         65.2µs       -0.04%

name                     old speed      new speed      delta
GobDecode-4               108MB/s ± 6%   108MB/s ± 6%    ~     (p=0.855 n=40+40)
GobEncode-4               112MB/s ± 9%   111MB/s ± 8%    ~     (p=0.159 n=40+40)
Gzip-4                   49.2MB/s ± 4%  49.1MB/s ± 3%    ~     (p=0.102 n=40+40)
Gunzip-4                  474MB/s ± 3%   472MB/s ± 3%    ~     (p=0.063 n=40+40)
JSONEncode-4              121MB/s ± 3%   123MB/s ± 3%  +1.62%  (p=0.001 n=40+40)
JSONDecode-4             31.9MB/s ± 3%  31.6MB/s ± 4%    ~     (p=0.070 n=40+40)
GoParse-4                17.9MB/s ± 2%  17.9MB/s ± 3%    ~     (p=0.696 n=40+40)
RegexpMatchEasy0_32-4     355MB/s ± 3%   358MB/s ± 5%  +0.99%  (p=0.002 n=40+40)
RegexpMatchEasy0_1K-4    1.26GB/s ± 3%  1.26GB/s ± 3%    ~     (p=0.381 n=40+40)
RegexpMatchEasy1_32-4     310MB/s ± 5%   310MB/s ± 4%    ~     (p=0.655 n=40+40)
RegexpMatchEasy1_1K-4    1.01GB/s ± 4%  1.01GB/s ± 3%    ~     (p=0.351 n=40+33)
RegexpMatchMedium_32-4   8.32MB/s ± 4%  8.34MB/s ± 5%    ~     (p=0.696 n=40+40)
RegexpMatchMedium_1K-4   25.6MB/s ± 3%  25.9MB/s ± 4%  +1.36%  (p=0.000 n=40+40)
RegexpMatchHard_32-4     14.1MB/s ± 6%  14.3MB/s ± 4%  +1.64%  (p=0.011 n=40+40)
RegexpMatchHard_1K-4     15.2MB/s ± 3%  15.2MB/s ± 3%    ~     (p=0.147 n=40+40)
Revcomp-4                 138MB/s ± 2%   137MB/s ± 3%  -0.70%  (p=0.021 n=40+40)
Template-4               28.1MB/s ± 4%  27.8MB/s ± 3%  -1.19%  (p=0.003 n=40+40)
[Geo mean]               83.7MB/s       83.7MB/s       +0.03%

Change-Id: I2a2b3a942b5c45467491515d201179fd192e65c9
Reviewed-on: https://go-review.googlesource.com/c/141650
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-16 07:17:11 +00:00
Ben Shi
3785be3093 test/codegen: fix confusing test cases 
ARMv7's MULAF/MULSF/MULAD/MULSD are not fused,
this CL fixes the confusing test cases.

Change-Id: I35022e207e2f0d24a23a7f6f188e41ba8eee9886
Reviewed-on: https://go-review.googlesource.com/c/142439
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Akhil Indurti <aindurti@gmail.com>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
 2018-10-16 07:17:02 +00:00
Martin Möhrmann
a0f57c3fd0 cmd/compile: avoid string allocations when map key is struct or array literal 
x = map[string(byteslice)] is already optimized by the compiler to avoid a
string allocation. This CL generalizes this optimization to:

x = map[T1{ ... Tn{..., string(byteslice), ...} ... }]
where T1 to Tn is a nesting of struct and array literals.

Found in a hot code path that used a struct of strings made from []byte
slices to make a map lookup.

There are no uses of the more generalized optimization in the standard library.
Passes toolstash -cmp.

MapStringConversion/32/simple    21.9ns ± 2%    21.9ns ± 3%      ~     (p=0.995 n=17+20)
MapStringConversion/32/struct    28.8ns ± 3%    22.0ns ± 2%   -23.80%  (p=0.000 n=20+20)
MapStringConversion/32/array     28.5ns ± 2%    21.9ns ± 2%   -23.14%  (p=0.000 n=19+16)
MapStringConversion/64/simple    21.0ns ± 2%    21.1ns ± 3%      ~     (p=0.072 n=19+18)
MapStringConversion/64/struct    72.4ns ± 3%    21.3ns ± 2%   -70.53%  (p=0.000 n=20+20)
MapStringConversion/64/array     72.8ns ± 1%    21.0ns ± 2%   -71.13%  (p=0.000 n=17+19)

name                           old allocs/op  new allocs/op  delta
MapStringConversion/32/simple      0.00           0.00           ~     (all equal)
MapStringConversion/32/struct      0.00           0.00           ~     (all equal)
MapStringConversion/32/array       0.00           0.00           ~     (all equal)
MapStringConversion/64/simple      0.00           0.00           ~     (all equal)
MapStringConversion/64/struct      1.00 ± 0%      0.00       -100.00%  (p=0.000 n=20+20)
MapStringConversion/64/array       1.00 ± 0%      0.00       -100.00%  (p=0.000 n=20+20)

Change-Id: I483b4d84d8d74b1025b62c954da9a365e79b7a3a
Reviewed-on: https://go-review.googlesource.com/c/116275
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-10-15 19:22:07 +00:00
Alberto Donizetti
7c96d87eda test/codegen: test ppc64 TrailingZeros, OnesCount codegen 
This change adds codegen tests for the intrinsification on ppc64 of
the OnesCount{64,32,16,8}, and TrailingZeros{64,32,16,8} math/bits
functions.

Change-Id: Id3364921fbd18316850e15c8c71330c906187fdb
Reviewed-on: https://go-review.googlesource.com/c/141897
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
 2018-10-15 16:53:03 +00:00
Ben Shi
93e27e01af test/codegen: add tests of FMA for arm/arm64 
This CL adds tests of fused multiplication-accumulation
on arm/arm64.

Change-Id: Ic85d5277c0d6acb7e1e723653372dfaf96824a39
Reviewed-on: https://go-review.googlesource.com/c/141652
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-10-15 14:51:30 +00:00
Ben Shi
c3208842e1 test/codegen: add tests for multiplication-subtraction 
This CL adds tests for armv7's MULS and arm64's MSUBW.

Change-Id: Id0fd5d26fd477e4ed14389b0d33cad930423eb5b
Reviewed-on: https://go-review.googlesource.com/c/141651
Run-TryBot: Ben Shi <powerman1st@163.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-10-15 02:41:33 +00:00
Keith Randall
653a4bd8d4 cmd/compile: optimize loads from readonly globals into constants 
Instead of
   MOVB go.string."foo"(SB), AX
do
   MOVB $102, AX

When we know the global we're loading from is readonly, we can
do that read at compile time.

I've made this arch-dependent mostly because the cases where this
happens often are memory->memory moves, and those don't get
decomposed until lowering.

Did amd64/386/arm/arm64. Other architectures could follow.

Update #26498

Change-Id: I41b1dc831b2cd0a52dac9b97f4f4457888a46389
Reviewed-on: https://go-review.googlesource.com/c/141118
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2018-10-14 02:54:40 +00:00
Ben Shi
bac6a2925c test/codegen: add more arm64 test cases 
This CL adds 3 combined load test cases for arm64.

Change-Id: I2c67308c40fd8a18f9f2d16c6d12911dcdc583e2
Reviewed-on: https://go-review.googlesource.com/c/140700
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-10-11 15:14:06 +00:00
Ben Shi
27965c1436 cmd/compile: optimize 386's ADDLconstmodifyidx4 
This CL optimize ADDLconstmodifyidx4 to INCL/DECL, when the
constant is +1/-1.

1. The total size of pkg/linux_386/ decreases 28 bytes, excluding
cmd/compile.

2. There is no regression in the go1 benchmark test, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.25s ± 2%     3.23s ± 3%  -0.70%  (p=0.040 n=30+30)
Fannkuch11-4                3.50s ± 1%     3.47s ± 1%  -0.68%  (p=0.000 n=30+30)
FmtFprintfEmpty-4          44.6ns ± 3%    44.8ns ± 3%  +0.46%  (p=0.029 n=30+30)
FmtFprintfString-4         79.0ns ± 3%    78.7ns ± 3%    ~     (p=0.053 n=30+30)
FmtFprintfInt-4            89.2ns ± 2%    89.4ns ± 3%    ~     (p=0.665 n=30+29)
FmtFprintfIntInt-4          142ns ± 3%     142ns ± 3%    ~     (p=0.435 n=30+30)
FmtFprintfPrefixedInt-4     182ns ± 2%     182ns ± 2%    ~     (p=0.964 n=30+30)
FmtFprintfFloat-4           407ns ± 3%     411ns ± 4%    ~     (p=0.080 n=30+30)
FmtManyArgs-4               597ns ± 3%     593ns ± 4%    ~     (p=0.222 n=30+30)
GobDecode-4                7.09ms ± 6%    7.07ms ± 7%    ~     (p=0.633 n=30+30)
GobEncode-4                6.81ms ± 9%    6.81ms ± 8%    ~     (p=0.982 n=30+30)
Gzip-4                      398ms ± 4%     400ms ± 6%    ~     (p=0.177 n=30+30)
Gunzip-4                   41.3ms ± 3%    40.6ms ± 4%  -1.71%  (p=0.005 n=30+30)
HTTPClientServer-4         63.4µs ± 3%    63.4µs ± 4%    ~     (p=0.646 n=30+28)
JSONEncode-4               16.0ms ± 3%    16.1ms ± 3%    ~     (p=0.057 n=30+30)
JSONDecode-4               63.3ms ± 8%    63.1ms ± 7%    ~     (p=0.786 n=30+30)
Mandelbrot200-4            5.17ms ± 3%    5.15ms ± 8%    ~     (p=0.654 n=30+30)
GoParse-4                  3.24ms ± 3%    3.23ms ± 2%    ~     (p=0.091 n=30+30)
RegexpMatchEasy0_32-4       103ns ± 4%     103ns ± 4%    ~     (p=0.575 n=30+30)
RegexpMatchEasy0_1K-4       823ns ± 2%     821ns ± 3%    ~     (p=0.827 n=30+30)
RegexpMatchEasy1_32-4       113ns ± 3%     112ns ± 3%    ~     (p=0.076 n=30+30)
RegexpMatchEasy1_1K-4      1.02µs ± 4%    1.01µs ± 5%    ~     (p=0.087 n=30+30)
RegexpMatchMedium_32-4      129ns ± 3%     127ns ± 4%  -1.55%  (p=0.009 n=30+30)
RegexpMatchMedium_1K-4     39.3µs ± 4%    39.7µs ± 3%    ~     (p=0.054 n=30+30)
RegexpMatchHard_32-4       2.15µs ± 4%    2.15µs ± 4%    ~     (p=0.712 n=30+30)
RegexpMatchHard_1K-4       66.0µs ± 3%    65.1µs ± 3%  -1.32%  (p=0.002 n=30+30)
Revcomp-4                   1.85s ± 2%     1.85s ± 3%    ~     (p=0.168 n=30+30)
Template-4                 69.5ms ± 7%    68.9ms ± 6%    ~     (p=0.250 n=28+28)
TimeParse-4                 434ns ± 3%     432ns ± 4%    ~     (p=0.629 n=30+30)
TimeFormat-4                403ns ± 4%     408ns ± 3%  +1.23%  (p=0.019 n=30+29)
[Geo mean]                 65.5µs         65.3µs       -0.20%

name                     old speed      new speed      delta
GobDecode-4               108MB/s ± 6%   109MB/s ± 6%    ~     (p=0.636 n=30+30)
GobEncode-4               113MB/s ±10%   113MB/s ± 9%    ~     (p=0.982 n=30+30)
Gzip-4                   48.8MB/s ± 4%  48.6MB/s ± 5%    ~     (p=0.178 n=30+30)
Gunzip-4                  470MB/s ± 3%   479MB/s ± 4%  +1.72%  (p=0.006 n=30+30)
JSONEncode-4              121MB/s ± 3%   120MB/s ± 3%    ~     (p=0.057 n=30+30)
JSONDecode-4             30.7MB/s ± 8%  30.8MB/s ± 8%    ~     (p=0.784 n=30+30)
GoParse-4                17.9MB/s ± 3%  17.9MB/s ± 2%    ~     (p=0.090 n=30+30)
RegexpMatchEasy0_32-4     309MB/s ± 4%   309MB/s ± 3%    ~     (p=0.530 n=30+30)
RegexpMatchEasy0_1K-4    1.24GB/s ± 2%  1.25GB/s ± 3%    ~     (p=0.976 n=30+30)
RegexpMatchEasy1_32-4     282MB/s ± 3%   284MB/s ± 3%  +0.81%  (p=0.041 n=30+30)
RegexpMatchEasy1_1K-4    1.00GB/s ± 3%  1.01GB/s ± 4%    ~     (p=0.091 n=30+30)
RegexpMatchMedium_32-4   7.71MB/s ± 3%  7.84MB/s ± 4%  +1.71%  (p=0.000 n=30+30)
RegexpMatchMedium_1K-4   26.1MB/s ± 4%  25.8MB/s ± 3%    ~     (p=0.051 n=30+30)
RegexpMatchHard_32-4     14.9MB/s ± 4%  14.9MB/s ± 4%    ~     (p=0.712 n=30+30)
RegexpMatchHard_1K-4     15.5MB/s ± 3%  15.7MB/s ± 3%  +1.34%  (p=0.003 n=30+30)
Revcomp-4                 138MB/s ± 2%   137MB/s ± 3%    ~     (p=0.174 n=30+30)
Template-4               28.0MB/s ± 6%  28.2MB/s ± 6%    ~     (p=0.251 n=28+28)
[Geo mean]               82.3MB/s       82.6MB/s       +0.36%

Change-Id: I389829699ffe9500a013fcf31be58a97e98043e1
Reviewed-on: https://go-review.googlesource.com/c/140701
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-11 01:20:34 +00:00
Keith Randall
ceb0c371d9 cmd/compile: make []byte("...") more efficient 
Do []byte(string) conversions more efficiently when the string
is a constant. Instead of calling stringtobyteslice, allocate
just the space we need and encode the initialization directly.

[]byte("foo") rewrites to the following pseudocode:

var s [3]byte // on heap or stack, depending on whether b escapes
s = *(*[3]byte)(&"foo"[0]) // initialize s from the string
b = s[:]

which generates this assembly:

	0x001d 00029 (tmp1.go:9)	LEAQ	type.[3]uint8(SB), AX
	0x0024 00036 (tmp1.go:9)	MOVQ	AX, (SP)
	0x0028 00040 (tmp1.go:9)	CALL	runtime.newobject(SB)
	0x002d 00045 (tmp1.go:9)	MOVQ	8(SP), AX
	0x0032 00050 (tmp1.go:9)	MOVBLZX	go.string."foo"+2(SB), CX
	0x0039 00057 (tmp1.go:9)	MOVWLZX	go.string."foo"(SB), DX
	0x0040 00064 (tmp1.go:9)	MOVW	DX, (AX)
	0x0043 00067 (tmp1.go:9)	MOVB	CL, 2(AX)
// Then the slice is b = {AX, 3, 3}

The generated code is still not optimal, as it still does load/store
from read-only memory instead of constant stores.  Next CL...

Update #26498
Fixes #10170

Change-Id: I4b990b19f9a308f60c8f4f148934acffefe0a5bd
Reviewed-on: https://go-review.googlesource.com/c/140698
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-10-10 16:10:40 +00:00
Ben Shi
3933302550 cmd/compile: add indexed form for several 386 instructions 
This CL implements indexed memory operands for the following instructions.
(ADD|SUB|MUL|AND|OR|XOR)Lload -> (ADD|SUB|MUL|AND|OR|XOR)Lloadidx4
(ADD|SUB|AND|OR|XOR)Lmodify -> (ADD|SUB|AND|OR|XOR)Lmodifyidx4
(ADD|AND|OR|XOR)Lconstmodify -> (ADD|AND|OR|XOR)Lconstmodifyidx4

1. The total size of pkg/linux_386/ decreases about 2.5KB, excluding
cmd/compile/ .

2. There is little regression in the go1 benchmark test, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.25s ± 3%     3.25s ± 3%    ~     (p=0.218 n=40+40)
Fannkuch11-4                3.53s ± 1%     3.53s ± 1%    ~     (p=0.303 n=40+40)
FmtFprintfEmpty-4          44.9ns ± 3%    45.6ns ± 3%  +1.48%  (p=0.030 n=40+36)
FmtFprintfString-4         78.7ns ± 5%    80.1ns ± 7%    ~     (p=0.217 n=36+40)
FmtFprintfInt-4            90.2ns ± 6%    89.8ns ± 5%    ~     (p=0.659 n=40+38)
FmtFprintfIntInt-4          140ns ± 5%     141ns ± 5%  +1.00%  (p=0.027 n=40+40)
FmtFprintfPrefixedInt-4     185ns ± 3%     183ns ± 3%    ~     (p=0.104 n=40+40)
FmtFprintfFloat-4           411ns ± 4%     406ns ± 3%  -1.37%  (p=0.005 n=40+40)
FmtManyArgs-4               590ns ± 4%     598ns ± 4%  +1.35%  (p=0.008 n=40+40)
GobDecode-4                7.16ms ± 5%    7.10ms ± 5%    ~     (p=0.335 n=40+40)
GobEncode-4                6.85ms ± 7%    6.74ms ± 9%    ~     (p=0.058 n=38+40)
Gzip-4                      400ms ± 4%     399ms ± 2%  -0.34%  (p=0.003 n=40+33)
Gunzip-4                   41.4ms ± 3%    41.4ms ± 4%  -0.12%  (p=0.020 n=40+40)
HTTPClientServer-4         64.1µs ± 4%    63.5µs ± 2%  -1.07%  (p=0.000 n=39+37)
JSONEncode-4               15.9ms ± 2%    15.9ms ± 3%    ~     (p=0.103 n=40+40)
JSONDecode-4               62.2ms ± 4%    61.6ms ± 3%  -0.98%  (p=0.006 n=39+40)
Mandelbrot200-4            5.18ms ± 3%    5.14ms ± 4%    ~     (p=0.125 n=40+40)
GoParse-4                  3.29ms ± 2%    3.27ms ± 2%  -0.66%  (p=0.006 n=40+40)
RegexpMatchEasy0_32-4       103ns ± 4%     103ns ± 4%    ~     (p=0.632 n=40+40)
RegexpMatchEasy0_1K-4       830ns ± 3%     828ns ± 3%    ~     (p=0.563 n=40+40)
RegexpMatchEasy1_32-4       113ns ± 4%     113ns ± 4%    ~     (p=0.494 n=40+40)
RegexpMatchEasy1_1K-4      1.03µs ± 4%    1.03µs ± 4%    ~     (p=0.665 n=40+40)
RegexpMatchMedium_32-4      130ns ± 4%     129ns ± 3%    ~     (p=0.458 n=40+40)
RegexpMatchMedium_1K-4     39.4µs ± 3%    39.7µs ± 3%    ~     (p=0.825 n=40+40)
RegexpMatchHard_32-4       2.16µs ± 4%    2.15µs ± 4%    ~     (p=0.137 n=40+40)
RegexpMatchHard_1K-4       65.2µs ± 3%    65.4µs ± 4%    ~     (p=0.160 n=40+40)
Revcomp-4                   1.87s ± 2%     1.87s ± 1%  +0.17%  (p=0.019 n=33+33)
Template-4                 69.4ms ± 3%    69.8ms ± 3%  +0.60%  (p=0.009 n=40+40)
TimeParse-4                 437ns ± 4%     438ns ± 4%    ~     (p=0.234 n=40+40)
TimeFormat-4                408ns ± 3%     408ns ± 3%    ~     (p=0.904 n=40+40)
[Geo mean]                 65.7µs         65.6µs       -0.08%

name                     old speed      new speed      delta
GobDecode-4               107MB/s ± 5%   108MB/s ± 5%    ~     (p=0.336 n=40+40)
GobEncode-4               112MB/s ± 6%   114MB/s ± 9%  +1.95%  (p=0.036 n=37+40)
Gzip-4                   48.5MB/s ± 4%  48.6MB/s ± 2%  +0.28%  (p=0.003 n=40+33)
Gunzip-4                  469MB/s ± 4%   469MB/s ± 4%  +0.11%  (p=0.021 n=40+40)
JSONEncode-4              122MB/s ± 2%   122MB/s ± 3%    ~     (p=0.105 n=40+40)
JSONDecode-4             31.2MB/s ± 4%  31.5MB/s ± 4%  +0.99%  (p=0.007 n=39+40)
GoParse-4                17.6MB/s ± 2%  17.7MB/s ± 2%  +0.66%  (p=0.007 n=40+40)
RegexpMatchEasy0_32-4     310MB/s ± 4%   310MB/s ± 4%    ~     (p=0.384 n=40+40)
RegexpMatchEasy0_1K-4    1.23GB/s ± 3%  1.24GB/s ± 3%    ~     (p=0.186 n=40+40)
RegexpMatchEasy1_32-4     283MB/s ± 3%   281MB/s ± 4%    ~     (p=0.855 n=40+40)
RegexpMatchEasy1_1K-4    1.00GB/s ± 4%  1.00GB/s ± 4%    ~     (p=0.665 n=40+40)
RegexpMatchMedium_32-4   7.68MB/s ± 4%  7.73MB/s ± 3%    ~     (p=0.359 n=40+40)
RegexpMatchMedium_1K-4   26.0MB/s ± 3%  25.8MB/s ± 3%    ~     (p=0.825 n=40+40)
RegexpMatchHard_32-4     14.8MB/s ± 3%  14.9MB/s ± 4%    ~     (p=0.136 n=40+40)
RegexpMatchHard_1K-4     15.7MB/s ± 3%  15.7MB/s ± 4%    ~     (p=0.150 n=40+40)
Revcomp-4                 136MB/s ± 1%   136MB/s ± 1%  -0.09%  (p=0.028 n=32+33)
Template-4               28.0MB/s ± 3%  27.8MB/s ± 3%  -0.59%  (p=0.010 n=40+40)
[Geo mean]               82.1MB/s       82.3MB/s       +0.25%

Change-Id: Ifa387a251056678326d3508aa02753b70bf7e5d0
Reviewed-on: https://go-review.googlesource.com/c/140303
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-10-09 03:55:08 +00:00
Carlos Eduardo Seo
9aed4cc395 cmd/compile: instrinsify math/bits.Mul on ppc64x 
Add SSA rules to intrinsify Mul/Mul64 on ppc64x.

benchmark             old ns/op     new ns/op     delta
BenchmarkMul-40       8.80          0.93          -89.43%
BenchmarkMul32-40     1.39          1.39          +0.00%
BenchmarkMul64-40     5.39          0.93          -82.75%

Updates #24813

Change-Id: I6e95bfbe976a2278bd17799df184a7fbc0e57829
Reviewed-on: https://go-review.googlesource.com/138917
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
 2018-10-02 18:56:06 +00:00
Ben Shi
5aeecc4530 cmd/compile: optimize arm64's code with more shifted operations 
This CL optimizes arm64's NEG/MVN/TST/CMN with a shifted operand.

1. The total size of pkg/android_arm64 decreases about 0.2KB, excluding
cmd/compile/ .

2. The go1 benchmark shows no regression, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              16.4s ± 1%     16.4s ± 1%    ~     (p=0.914 n=29+29)
Fannkuch11-4                8.72s ± 0%     8.72s ± 0%    ~     (p=0.274 n=30+29)
FmtFprintfEmpty-4           174ns ± 0%     174ns ± 0%    ~     (all equal)
FmtFprintfString-4          370ns ± 0%     370ns ± 0%    ~     (all equal)
FmtFprintfInt-4             419ns ± 0%     419ns ± 0%    ~     (all equal)
FmtFprintfIntInt-4          672ns ± 1%     675ns ± 2%    ~     (p=0.217 n=28+30)
FmtFprintfPrefixedInt-4     806ns ± 0%     806ns ± 0%    ~     (p=0.402 n=30+28)
FmtFprintfFloat-4          1.09µs ± 0%    1.09µs ± 0%  +0.02%  (p=0.011 n=22+27)
FmtManyArgs-4              2.67µs ± 0%    2.68µs ± 0%    ~     (p=0.279 n=29+30)
GobDecode-4                33.1ms ± 1%    33.1ms ± 0%    ~     (p=0.052 n=28+29)
GobEncode-4                29.6ms ± 0%    29.6ms ± 0%  +0.08%  (p=0.013 n=28+29)
Gzip-4                      1.38s ± 2%     1.39s ± 2%    ~     (p=0.071 n=29+29)
Gunzip-4                    139ms ± 0%     139ms ± 0%    ~     (p=0.265 n=29+29)
HTTPClientServer-4          789µs ± 4%     785µs ± 4%    ~     (p=0.206 n=29+28)
JSONEncode-4               49.7ms ± 0%    49.6ms ± 0%  -0.24%  (p=0.000 n=30+30)
JSONDecode-4                266ms ± 1%     267ms ± 1%  +0.34%  (p=0.000 n=30+30)
Mandelbrot200-4            16.6ms ± 0%    16.6ms ± 0%    ~     (p=0.835 n=28+30)
GoParse-4                  15.9ms ± 0%    15.8ms ± 0%  -0.29%  (p=0.000 n=27+30)
RegexpMatchEasy0_32-4       380ns ± 0%     381ns ± 0%  +0.18%  (p=0.000 n=30+30)
RegexpMatchEasy0_1K-4      1.18µs ± 0%    1.19µs ± 0%  +0.23%  (p=0.000 n=30+30)
RegexpMatchEasy1_32-4       357ns ± 0%     358ns ± 0%  +0.28%  (p=0.000 n=29+29)
RegexpMatchEasy1_1K-4      2.04µs ± 0%    2.04µs ± 0%  +0.06%  (p=0.006 n=30+30)
RegexpMatchMedium_32-4      589ns ± 0%     590ns ± 0%  +0.24%  (p=0.000 n=28+30)
RegexpMatchMedium_1K-4      162µs ± 0%     162µs ± 0%  -0.01%  (p=0.027 n=26+29)
RegexpMatchHard_32-4       9.58µs ± 0%    9.58µs ± 0%    ~     (p=0.935 n=30+30)
RegexpMatchHard_1K-4        287µs ± 0%     287µs ± 0%    ~     (p=0.387 n=29+30)
Revcomp-4                   2.50s ± 0%     2.50s ± 0%  -0.10%  (p=0.020 n=28+28)
Template-4                  310ms ± 0%     310ms ± 1%    ~     (p=0.406 n=30+30)
TimeParse-4                1.68µs ± 0%    1.68µs ± 0%  +0.03%  (p=0.014 n=30+17)
TimeFormat-4               1.65µs ± 0%    1.66µs ± 0%  +0.32%  (p=0.000 n=27+29)
[Geo mean]                  247µs          247µs       +0.05%

name                     old speed      new speed      delta
GobDecode-4              23.2MB/s ± 0%  23.2MB/s ± 0%  -0.08%  (p=0.032 n=27+29)
GobEncode-4              26.0MB/s ± 0%  25.9MB/s ± 0%  -0.10%  (p=0.011 n=29+29)
Gzip-4                   14.1MB/s ± 2%  14.0MB/s ± 2%    ~     (p=0.081 n=29+29)
Gunzip-4                  139MB/s ± 0%   139MB/s ± 0%    ~     (p=0.290 n=29+29)
JSONEncode-4             39.0MB/s ± 0%  39.1MB/s ± 0%  +0.25%  (p=0.000 n=29+30)
JSONDecode-4             7.30MB/s ± 1%  7.28MB/s ± 1%  -0.33%  (p=0.000 n=30+30)
GoParse-4                3.65MB/s ± 0%  3.66MB/s ± 0%  +0.29%  (p=0.000 n=27+30)
RegexpMatchEasy0_32-4    84.1MB/s ± 0%  84.0MB/s ± 0%  -0.17%  (p=0.000 n=30+28)
RegexpMatchEasy0_1K-4     864MB/s ± 0%   862MB/s ± 0%  -0.24%  (p=0.000 n=30+30)
RegexpMatchEasy1_32-4    89.5MB/s ± 0%  89.3MB/s ± 0%  -0.18%  (p=0.000 n=28+24)
RegexpMatchEasy1_1K-4     502MB/s ± 0%   502MB/s ± 0%  -0.05%  (p=0.008 n=30+29)
RegexpMatchMedium_32-4   1.70MB/s ± 0%  1.69MB/s ± 0%  -0.59%  (p=0.000 n=29+30)
RegexpMatchMedium_1K-4   6.31MB/s ± 0%  6.31MB/s ± 0%  +0.05%  (p=0.005 n=30+26)
RegexpMatchHard_32-4     3.34MB/s ± 0%  3.34MB/s ± 0%    ~     (all equal)
RegexpMatchHard_1K-4     3.57MB/s ± 0%  3.57MB/s ± 0%    ~     (all equal)
Revcomp-4                 102MB/s ± 0%   102MB/s ± 0%  +0.10%  (p=0.022 n=28+28)
Template-4               6.26MB/s ± 0%  6.26MB/s ± 1%    ~     (p=0.768 n=30+30)
[Geo mean]               24.2MB/s       24.1MB/s       -0.08%

Change-Id: I494f9db7f8a568a00e9c74ae25086a58b2221683
Reviewed-on: https://go-review.googlesource.com/137976
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-28 15:05:17 +00:00
Ben Shi
d60cf39f8e cmd/compile: optimize arm64's MADD and MSUB 
This CL implements constant folding for MADD/MSUB on arm64.

1. The total size of pkg/android_arm64/ decreases about 4KB,
   excluding cmd/compile/ .

2. There is no regression in the go1 benchmark, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              16.4s ± 1%     16.5s ± 1%  +0.24%  (p=0.008 n=29+29)
Fannkuch11-4                8.73s ± 0%     8.71s ± 0%  -0.15%  (p=0.000 n=29+29)
FmtFprintfEmpty-4           174ns ± 0%     174ns ± 0%    ~     (all equal)
FmtFprintfString-4          370ns ± 0%     372ns ± 2%  +0.53%  (p=0.007 n=24+30)
FmtFprintfInt-4             419ns ± 0%     419ns ± 0%    ~     (all equal)
FmtFprintfIntInt-4          673ns ± 1%     661ns ± 1%  -1.81%  (p=0.000 n=30+27)
FmtFprintfPrefixedInt-4     806ns ± 0%     805ns ± 0%    ~     (p=0.957 n=28+27)
FmtFprintfFloat-4          1.09µs ± 0%    1.09µs ± 0%  -0.04%  (p=0.001 n=22+30)
FmtManyArgs-4              2.67µs ± 0%    2.68µs ± 0%  +0.03%  (p=0.045 n=29+28)
GobDecode-4                33.2ms ± 1%    32.5ms ± 1%  -2.11%  (p=0.000 n=29+29)
GobEncode-4                29.5ms ± 0%    29.2ms ± 0%  -1.04%  (p=0.000 n=28+28)
Gzip-4                      1.39s ± 2%     1.38s ± 1%  -0.48%  (p=0.023 n=30+30)
Gunzip-4                    139ms ± 0%     139ms ± 0%    ~     (p=0.616 n=30+28)
HTTPClientServer-4          766µs ± 4%     758µs ± 3%  -1.03%  (p=0.013 n=28+29)
JSONEncode-4               49.7ms ± 0%    49.6ms ± 0%  -0.24%  (p=0.000 n=30+30)
JSONDecode-4                266ms ± 0%     268ms ± 1%  +1.07%  (p=0.000 n=29+30)
Mandelbrot200-4            16.6ms ± 0%    16.6ms ± 0%    ~     (p=0.248 n=30+29)
GoParse-4                  15.9ms ± 0%    16.0ms ± 0%  +0.76%  (p=0.000 n=29+29)
RegexpMatchEasy0_32-4       381ns ± 0%     380ns ± 0%  -0.14%  (p=0.000 n=30+30)
RegexpMatchEasy0_1K-4      1.18µs ± 0%    1.19µs ± 1%  +0.30%  (p=0.000 n=29+30)
RegexpMatchEasy1_32-4       357ns ± 0%     357ns ± 0%    ~     (all equal)
RegexpMatchEasy1_1K-4      2.04µs ± 0%    2.05µs ± 0%  +0.50%  (p=0.000 n=26+28)
RegexpMatchMedium_32-4      590ns ± 0%     589ns ± 0%  -0.12%  (p=0.000 n=30+23)
RegexpMatchMedium_1K-4      162µs ± 0%     162µs ± 0%    ~     (p=0.318 n=28+25)
RegexpMatchHard_32-4       9.56µs ± 0%    9.56µs ± 0%    ~     (p=0.072 n=30+29)
RegexpMatchHard_1K-4        287µs ± 0%     287µs ± 0%  -0.02%  (p=0.005 n=28+28)
Revcomp-4                   2.50s ± 0%     2.51s ± 0%    ~     (p=0.246 n=29+29)
Template-4                  312ms ± 1%     313ms ± 1%  +0.46%  (p=0.002 n=30+30)
TimeParse-4                1.68µs ± 0%    1.67µs ± 0%  -0.31%  (p=0.000 n=27+29)
TimeFormat-4               1.66µs ± 0%    1.64µs ± 0%  -0.92%  (p=0.000 n=29+26)
[Geo mean]                  247µs          246µs       -0.15%

name                     old speed      new speed      delta
GobDecode-4              23.1MB/s ± 1%  23.6MB/s ± 0%  +2.17%  (p=0.000 n=29+28)
GobEncode-4              26.0MB/s ± 0%  26.3MB/s ± 0%  +1.05%  (p=0.000 n=28+28)
Gzip-4                   14.0MB/s ± 2%  14.1MB/s ± 1%  +0.47%  (p=0.026 n=30+30)
Gunzip-4                  139MB/s ± 0%   139MB/s ± 0%    ~     (p=0.624 n=30+28)
JSONEncode-4             39.1MB/s ± 0%  39.2MB/s ± 0%  +0.24%  (p=0.000 n=30+30)
JSONDecode-4             7.31MB/s ± 0%  7.23MB/s ± 1%  -1.07%  (p=0.000 n=28+30)
GoParse-4                3.65MB/s ± 0%  3.62MB/s ± 0%  -0.77%  (p=0.000 n=29+29)
RegexpMatchEasy0_32-4    84.0MB/s ± 0%  84.1MB/s ± 0%  +0.18%  (p=0.000 n=28+30)
RegexpMatchEasy0_1K-4     864MB/s ± 0%   861MB/s ± 1%  -0.29%  (p=0.000 n=29+30)
RegexpMatchEasy1_32-4    89.5MB/s ± 0%  89.5MB/s ± 0%    ~     (p=0.841 n=28+28)
RegexpMatchEasy1_1K-4     502MB/s ± 0%   500MB/s ± 0%  -0.51%  (p=0.000 n=29+29)
RegexpMatchMedium_32-4   1.69MB/s ± 0%  1.70MB/s ± 0%  +0.41%  (p=0.000 n=26+30)
RegexpMatchMedium_1K-4   6.31MB/s ± 0%  6.30MB/s ± 0%    ~     (p=0.129 n=30+25)
RegexpMatchHard_32-4     3.35MB/s ± 0%  3.35MB/s ± 0%    ~     (p=0.657 n=30+29)
RegexpMatchHard_1K-4     3.57MB/s ± 0%  3.57MB/s ± 0%    ~     (all equal)
Revcomp-4                 102MB/s ± 0%   101MB/s ± 0%    ~     (p=0.213 n=29+29)
Template-4               6.22MB/s ± 1%  6.19MB/s ± 1%  -0.42%  (p=0.005 n=30+29)
[Geo mean]               24.1MB/s       24.2MB/s       +0.08%

Change-Id: I6c02d3c9975f6bd8bc215cb1fc14d29602b45649
Reviewed-on: https://go-review.googlesource.com/138095
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-28 15:03:17 +00:00
Brian Kessler
9eb53ab9bc cmd/compile: intrinsify math/bits.Mul 
Add SSA rules to intrinsify Mul/Mul64 (AMD64 and ARM64).
SSA rules for other functions and architectures are left as a future
optimization.  Benchmark results on AMD64/ARM64 before and after SSA
implementation are below.

amd64
name     old time/op  new time/op  delta
Add-4    1.78ns ± 0%  1.85ns ±12%     ~     (p=0.397 n=4+5)
Add32-4  1.71ns ± 1%  1.70ns ± 0%     ~     (p=0.683 n=5+5)
Add64-4  1.80ns ± 2%  1.77ns ± 0%   -1.22%  (p=0.048 n=5+5)
Sub-4    1.78ns ± 0%  1.78ns ± 0%     ~     (all equal)
Sub32-4  1.78ns ± 1%  1.78ns ± 0%     ~     (p=1.000 n=5+5)
Sub64-4  1.78ns ± 1%  1.78ns ± 0%     ~     (p=0.968 n=5+4)
Mul-4    11.5ns ± 1%   1.8ns ± 2%  -84.39%  (p=0.008 n=5+5)
Mul32-4  1.39ns ± 0%  1.38ns ± 3%     ~     (p=0.175 n=5+5)
Mul64-4  6.85ns ± 1%  1.78ns ± 1%  -73.97%  (p=0.008 n=5+5)
Div-4    57.1ns ± 1%  56.7ns ± 0%     ~     (p=0.087 n=5+5)
Div32-4  18.0ns ± 0%  18.0ns ± 0%     ~     (all equal)
Div64-4  56.4ns ±10%  53.6ns ± 1%     ~     (p=0.071 n=5+5)

arm64
name      old time/op  new time/op  delta
Add-96    5.51ns ± 0%  5.51ns ± 0%     ~     (all equal)
Add32-96  5.51ns ± 0%  5.51ns ± 0%     ~     (all equal)
Add64-96  5.52ns ± 0%  5.51ns ± 0%     ~     (p=0.444 n=5+5)
Sub-96    5.51ns ± 0%  5.51ns ± 0%     ~     (all equal)
Sub32-96  5.51ns ± 0%  5.51ns ± 0%     ~     (all equal)
Sub64-96  5.51ns ± 0%  5.51ns ± 0%     ~     (all equal)
Mul-96    34.6ns ± 0%   5.0ns ± 0%  -85.52%  (p=0.008 n=5+5)
Mul32-96  4.51ns ± 0%  4.51ns ± 0%     ~     (all equal)
Mul64-96  21.1ns ± 0%   5.0ns ± 0%  -76.26%  (p=0.008 n=5+5)
Div-96    64.7ns ± 0%  64.7ns ± 0%     ~     (all equal)
Div32-96  17.0ns ± 0%  17.0ns ± 0%     ~     (all equal)
Div64-96  53.1ns ± 0%  53.1ns ± 0%     ~     (all equal)

Updates #24813

Change-Id: I9bda6d2102f65cae3d436a2087b47ed8bafeb068
Reviewed-on: https://go-review.googlesource.com/129415
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-09-26 20:35:57 +00:00
Iskander Sharipov
c03d0e4fec cmd/compile/internal/gc: handle arith ops in samesafeexpr 
Teach samesafeexpr to handle arithmetic unary and binary ops.

It makes map lookup optimization possible in

	m[k+1] = append(m[k+1], ...)
	m[-k] = append(m[-k], ...)
	... etc

Does not cover "+" for strings (concatenation).

Change-Id: Ibbb16ac3faf176958da344be1471b06d7cf33a6c
Reviewed-on: https://go-review.googlesource.com/135795
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-09-19 12:03:58 +00:00
Ben Shi
c6bf9a8109 cmd/compile: optimize AMD64's bit wise operation 
Currently "arr[idx] |= 0x80" is compiled to MOVLload->BTSL->MOVLstore.
And this CL optimizes it to a single BTSLconstmodify. Other bit wise
operations with a direct memory operand are also implemented.

1. The size of the executable bin/go decreases about 4KB, and the total size
of pkg/linux_amd64 (excluding cmd/compile) decreases about 0.6KB.

2. There a little improvement in the go1 benchmark test (excluding noise).
name                     old time/op    new time/op    delta
BinaryTree17-4              2.66s ± 4%     2.66s ± 3%    ~     (p=0.596 n=49+49)
Fannkuch11-4                2.38s ± 2%     2.32s ± 2%  -2.69%  (p=0.000 n=50+50)
FmtFprintfEmpty-4          42.7ns ± 4%    43.2ns ± 7%  +1.31%  (p=0.009 n=50+50)
FmtFprintfString-4         71.0ns ± 5%    72.0ns ± 3%  +1.33%  (p=0.000 n=50+50)
FmtFprintfInt-4            80.7ns ± 4%    80.6ns ± 3%    ~     (p=0.931 n=50+50)
FmtFprintfIntInt-4          125ns ± 3%     126ns ± 4%    ~     (p=0.051 n=50+50)
FmtFprintfPrefixedInt-4     158ns ± 1%     142ns ± 3%  -9.84%  (p=0.000 n=36+50)
FmtFprintfFloat-4           215ns ± 4%     212ns ± 4%  -1.23%  (p=0.002 n=50+50)
FmtManyArgs-4               519ns ± 3%     510ns ± 3%  -1.77%  (p=0.000 n=50+50)
GobDecode-4                6.49ms ± 6%    6.52ms ± 5%    ~     (p=0.866 n=50+50)
GobEncode-4                5.93ms ± 8%    6.01ms ± 7%    ~     (p=0.076 n=50+50)
Gzip-4                      222ms ± 4%     224ms ± 8%  +0.80%  (p=0.001 n=50+50)
Gunzip-4                   36.6ms ± 5%    36.4ms ± 4%    ~     (p=0.093 n=50+50)
HTTPClientServer-4         59.1µs ± 1%    58.9µs ± 2%  -0.24%  (p=0.039 n=49+48)
JSONEncode-4               9.23ms ± 4%    9.21ms ± 5%    ~     (p=0.244 n=50+50)
JSONDecode-4               48.8ms ± 4%    48.7ms ± 4%    ~     (p=0.653 n=50+50)
Mandelbrot200-4            3.81ms ± 4%    3.80ms ± 3%    ~     (p=0.834 n=50+50)
GoParse-4                  3.20ms ± 5%    3.19ms ± 5%    ~     (p=0.494 n=50+50)
RegexpMatchEasy0_32-4      78.1ns ± 2%    77.4ns ± 3%  -0.86%  (p=0.005 n=50+50)
RegexpMatchEasy0_1K-4       233ns ± 3%     233ns ± 3%    ~     (p=0.074 n=50+50)
RegexpMatchEasy1_32-4      74.2ns ± 3%    73.4ns ± 3%  -1.06%  (p=0.000 n=50+50)
RegexpMatchEasy1_1K-4       369ns ± 2%     364ns ± 4%  -1.41%  (p=0.000 n=36+50)
RegexpMatchMedium_32-4      109ns ± 4%     107ns ± 3%  -2.06%  (p=0.001 n=50+50)
RegexpMatchMedium_1K-4     31.5µs ± 3%    30.8µs ± 3%  -2.20%  (p=0.000 n=50+50)
RegexpMatchHard_32-4       1.57µs ± 3%    1.56µs ± 2%  -0.57%  (p=0.016 n=50+50)
RegexpMatchHard_1K-4       47.4µs ± 4%    47.0µs ± 3%  -0.82%  (p=0.008 n=50+50)
Revcomp-4                   414ms ± 7%     412ms ± 7%    ~     (p=0.285 n=50+50)
Template-4                 64.3ms ± 4%    62.7ms ± 3%  -2.44%  (p=0.000 n=50+50)
TimeParse-4                 316ns ± 3%     313ns ± 3%    ~     (p=0.122 n=50+50)
TimeFormat-4                291ns ± 3%     293ns ± 3%  +0.80%  (p=0.001 n=50+50)
[Geo mean]                 46.5µs         46.2µs       -0.81%

name                     old speed      new speed      delta
GobDecode-4               118MB/s ± 6%   118MB/s ± 5%    ~     (p=0.863 n=50+50)
GobEncode-4               130MB/s ± 9%   128MB/s ± 8%    ~     (p=0.076 n=50+50)
Gzip-4                   87.4MB/s ± 4%  86.8MB/s ± 7%  -0.78%  (p=0.002 n=50+50)
Gunzip-4                  531MB/s ± 5%   533MB/s ± 4%    ~     (p=0.093 n=50+50)
JSONEncode-4              210MB/s ± 4%   211MB/s ± 5%    ~     (p=0.247 n=50+50)
JSONDecode-4             39.8MB/s ± 4%  39.9MB/s ± 4%    ~     (p=0.654 n=50+50)
GoParse-4                18.1MB/s ± 5%  18.2MB/s ± 5%    ~     (p=0.493 n=50+50)
RegexpMatchEasy0_32-4     410MB/s ± 2%   413MB/s ± 3%  +0.86%  (p=0.004 n=50+50)
RegexpMatchEasy0_1K-4    4.39GB/s ± 3%  4.38GB/s ± 3%    ~     (p=0.063 n=50+50)
RegexpMatchEasy1_32-4     432MB/s ± 3%   436MB/s ± 3%  +1.07%  (p=0.000 n=50+50)
RegexpMatchEasy1_1K-4    2.77GB/s ± 2%  2.81GB/s ± 4%  +1.46%  (p=0.000 n=36+50)
RegexpMatchMedium_32-4   9.16MB/s ± 3%  9.35MB/s ± 4%  +2.09%  (p=0.001 n=50+50)
RegexpMatchMedium_1K-4   32.5MB/s ± 3%  33.2MB/s ± 3%  +2.25%  (p=0.000 n=50+50)
RegexpMatchHard_32-4     20.4MB/s ± 3%  20.5MB/s ± 2%  +0.56%  (p=0.017 n=50+50)
RegexpMatchHard_1K-4     21.6MB/s ± 4%  21.8MB/s ± 3%  +0.83%  (p=0.008 n=50+50)
Revcomp-4                 613MB/s ± 4%   618MB/s ± 7%    ~     (p=0.152 n=48+50)
Template-4               30.2MB/s ± 4%  30.9MB/s ± 3%  +2.49%  (p=0.000 n=50+50)
[Geo mean]                127MB/s        128MB/s       +0.64%

Change-Id: If405198283855d75697f66cf894b2bef458f620e
Reviewed-on: https://go-review.googlesource.com/135422
Reviewed-by: Keith Randall <khr@golang.org>
 2018-09-19 03:00:58 +00:00
fanzha02
a19a83c8ef cmd/compile: optimize math.Float64(32)bits and math.Float64(32)frombits on arm64 
Use float <-> int register moves without conversion instead of stores
and loads to move float <-> int values.

Math package benchmark results.
name                 old time/op  new time/op  delta
Acosh                 153ns ± 0%   147ns ± 0%   -3.92%  (p=0.000 n=10+10)
Asinh                 183ns ± 0%   177ns ± 0%   -3.28%  (p=0.000 n=10+10)
Atanh                 157ns ± 0%   155ns ± 0%   -1.27%  (p=0.000 n=10+10)
Atan2                 118ns ± 0%   117ns ± 1%   -0.59%  (p=0.003 n=10+10)
Cbrt                  119ns ± 0%   114ns ± 0%   -4.20%  (p=0.000 n=10+10)
Copysign             7.51ns ± 0%  6.51ns ± 0%  -13.32%  (p=0.000 n=9+10)
Cos                  73.1ns ± 0%  70.6ns ± 0%   -3.42%  (p=0.000 n=10+10)
Cosh                  119ns ± 0%   121ns ± 0%   +1.68%  (p=0.000 n=10+9)
ExpGo                 154ns ± 0%   149ns ± 0%   -3.05%  (p=0.000 n=9+10)
Expm1                 101ns ± 0%    99ns ± 0%   -1.88%  (p=0.000 n=10+10)
Exp2Go                150ns ± 0%   146ns ± 0%   -2.67%  (p=0.000 n=10+10)
Abs                  7.01ns ± 0%  6.01ns ± 0%  -14.27%  (p=0.000 n=10+9)
Mod                   234ns ± 0%   212ns ± 0%   -9.40%  (p=0.000 n=9+10)
Frexp                34.5ns ± 0%  30.0ns ± 0%  -13.04%  (p=0.000 n=10+10)
Gamma                 112ns ± 0%   111ns ± 0%   -0.89%  (p=0.000 n=10+10)
Hypot                73.6ns ± 0%  68.6ns ± 0%   -6.79%  (p=0.000 n=10+10)
HypotGo              77.1ns ± 0%  72.1ns ± 0%   -6.49%  (p=0.000 n=10+10)
Ilogb                31.0ns ± 0%  28.0ns ± 0%   -9.68%  (p=0.000 n=10+10)
J0                    437ns ± 0%   434ns ± 0%   -0.62%  (p=0.000 n=10+10)
J1                    433ns ± 0%   431ns ± 0%   -0.46%  (p=0.000 n=10+10)
Jn                    927ns ± 0%   922ns ± 0%   -0.54%  (p=0.000 n=10+10)
Ldexp                41.5ns ± 0%  37.0ns ± 0%  -10.84%  (p=0.000 n=9+10)
Log                   124ns ± 0%   118ns ± 0%   -4.84%  (p=0.000 n=10+9)
Logb                 34.0ns ± 0%  32.0ns ± 0%   -5.88%  (p=0.000 n=10+10)
Log1p                 110ns ± 0%   108ns ± 0%   -1.82%  (p=0.000 n=10+10)
Log10                 136ns ± 0%   132ns ± 0%   -2.94%  (p=0.000 n=10+10)
Log2                 51.6ns ± 0%  47.1ns ± 0%   -8.72%  (p=0.000 n=10+10)
Nextafter32          33.0ns ± 0%  30.5ns ± 0%   -7.58%  (p=0.000 n=10+10)
Nextafter64          29.0ns ± 0%  26.5ns ± 0%   -8.62%  (p=0.000 n=10+10)
PowInt                169ns ± 0%   160ns ± 0%   -5.33%  (p=0.000 n=10+10)
PowFrac               375ns ± 0%   361ns ± 0%   -3.73%  (p=0.000 n=10+10)
RoundToEven          14.0ns ± 0%  12.5ns ± 0%  -10.71%  (p=0.000 n=10+10)
Remainder             206ns ± 0%   192ns ± 0%   -6.80%  (p=0.000 n=10+9)
Signbit              6.01ns ± 0%  5.51ns ± 0%   -8.32%  (p=0.000 n=10+9)
Sin                  70.1ns ± 0%  69.6ns ± 0%   -0.71%  (p=0.000 n=10+10)
Sincos               99.1ns ± 0%  99.6ns ± 0%   +0.50%  (p=0.000 n=9+10)
SqrtGoLatency         178ns ± 0%   146ns ± 0%  -17.70%  (p=0.000 n=8+10)
SqrtPrime            9.19µs ± 0%  9.20µs ± 0%   +0.01%  (p=0.000 n=9+9)
Tanh                  125ns ± 1%   127ns ± 0%   +1.36%  (p=0.000 n=10+10)
Y0                    428ns ± 0%   426ns ± 0%   -0.47%  (p=0.000 n=10+10)
Y1                    431ns ± 0%   429ns ± 0%   -0.46%  (p=0.000 n=10+9)
Yn                    906ns ± 0%   901ns ± 0%   -0.55%  (p=0.000 n=10+10)
Float64bits          4.50ns ± 0%  3.50ns ± 0%  -22.22%  (p=0.000 n=10+10)
Float64frombits      4.00ns ± 0%  3.50ns ± 0%  -12.50%  (p=0.000 n=10+9)
Float32bits          4.50ns ± 0%  3.50ns ± 0%  -22.22%  (p=0.002 n=8+10)
Float32frombits      4.00ns ± 0%  3.50ns ± 0%  -12.50%  (p=0.000 n=10+10)

Change-Id: Iba829e15d5624962fe0c699139ea783efeefabc2
Reviewed-on: https://go-review.googlesource.com/129715
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-09-17 20:49:04 +00:00
Keith Randall
b1f656b1ce cmd/compile: fold address calculations into CMPload[const] ops 
Makes go binary smaller by 0.2%.

I noticed this in autogenerated equal methods, and there are
probably a lot of those.

Change-Id: I4e04eb3653fbceb9dd6a4eee97ceab1fa4d10b72
Reviewed-on: https://go-review.googlesource.com/135379
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2018-09-14 19:42:09 +00:00
Lynn Boger
8dbd9afbb0 cmd/compile: improve rules for PPC64.rules 
This adds some improvements to the rules for PPC64 to eliminate
unnecessary zero or sign extends, and fix some rule for truncates
which were not always using the correct sign instruction.

This reduces of size of many functions by 1 or 2 instructions and
can improve performance in cases where the execution time depends
on small loops where at least 1 instruction was removed and where that
loop contributes a significant amount of the total execution time.

Included is a testcase for codegen to verify the sign/zero extend
instructions are omitted.

An example of the improvement (strings):
IndexAnyASCII/256:1-16     392ns ± 0%   369ns ± 0%  -5.79%  (p=0.000 n=1+10)
IndexAnyASCII/256:2-16     397ns ± 0%   376ns ± 0%  -5.23%  (p=0.000 n=1+9)
IndexAnyASCII/256:4-16     405ns ± 0%   384ns ± 0%  -5.19%  (p=1.714 n=1+6)
IndexAnyASCII/256:8-16     427ns ± 0%   403ns ± 0%  -5.57%  (p=0.000 n=1+10)
IndexAnyASCII/256:16-16    441ns ± 0%   418ns ± 1%  -5.33%  (p=0.000 n=1+10)
IndexAnyASCII/4096:1-16   5.62µs ± 0%  5.27µs ± 1%  -6.31%  (p=0.000 n=1+10)
IndexAnyASCII/4096:2-16   5.67µs ± 0%  5.29µs ± 0%  -6.67%  (p=0.222 n=1+8)
IndexAnyASCII/4096:4-16   5.66µs ± 0%  5.28µs ± 1%  -6.66%  (p=0.000 n=1+10)
IndexAnyASCII/4096:8-16   5.66µs ± 0%  5.31µs ± 1%  -6.10%  (p=0.000 n=1+10)
IndexAnyASCII/4096:16-16  5.70µs ± 0%  5.33µs ± 1%  -6.43%  (p=0.182 n=1+10)

Change-Id: I739a6132b505936d39001aada5a978ff2a5f0500
Reviewed-on: https://go-review.googlesource.com/129875
Reviewed-by: David Chase <drchase@google.com>
 2018-09-13 18:24:53 +00:00
erifan01
8149db4f64 cmd/compile: intrinsify math.RoundToEven and math.Abs on arm64 
math.RoundToEven can be done by one arm64 instruction FRINTND, intrinsify it to improve performance.
The current pure Go implementation of the function Abs is translated into five instructions on arm64:
str, ldr, and, str, ldr. The intrinsic implementation requires only one instruction, so in terms of
performance, intrinsify it is worthwhile.

Benchmarks:
name           old time/op  new time/op  delta
Abs-8          3.50ns ± 0%  1.50ns ± 0%  -57.14%  (p=0.000 n=10+10)
RoundToEven-8  9.26ns ± 0%  1.50ns ± 0%  -83.80%  (p=0.000 n=10+10)

Change-Id: I9456b26ab282b544dfac0154fc86f17aed96ac3d
Reviewed-on: https://go-review.googlesource.com/116535
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-09-13 14:52:51 +00:00
fanzha02
d5377c2026 test: fix the wrong test of math.Copysign(c, -1) for arm64 
The CL 132915 added the wrong codegen test for math.Copysign(c, -1),
it should test that AND is not emitted. This CL fixes this error.

Change-Id: Ida1d3d54ebfc7f238abccbc1f70f914e1b5bfd91
Reviewed-on: https://go-review.googlesource.com/134815
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-09-12 15:34:20 +00:00
Ben Shi
9f2411894b cmd/compile: optimize arm's bit operation 
BFC (Bit Field Clear) was introduced in ARMv7, which can simplify
ANDconst and BICconst. And this CL implements that optimization.

1. The total size of pkg/android_arm decreases about 3KB, excluding
cmd/compile/.

2. There is no regression in the go1 benchmark result, and some
cases (FmtFprintfEmpty-4 and RegexpMatchMedium_32-4) even get
slight improvement.

name                     old time/op    new time/op    delta
BinaryTree17-4              25.3s ± 1%     25.2s ± 1%    ~     (p=0.072 n=30+29)
Fannkuch11-4                13.3s ± 0%     13.3s ± 0%  +0.13%  (p=0.000 n=30+26)
FmtFprintfEmpty-4           407ns ± 0%     394ns ± 0%  -3.19%  (p=0.000 n=26+28)
FmtFprintfString-4          664ns ± 0%     662ns ± 0%  -0.22%  (p=0.000 n=30+30)
FmtFprintfInt-4             712ns ± 0%     706ns ± 0%  -0.79%  (p=0.000 n=30+30)
FmtFprintfIntInt-4         1.06µs ± 0%    1.05µs ± 0%  -0.38%  (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4    1.16µs ± 0%    1.16µs ± 0%  -0.13%  (p=0.000 n=30+29)
FmtFprintfFloat-4          2.24µs ± 0%    2.23µs ± 0%  -0.51%  (p=0.000 n=29+21)
FmtManyArgs-4              4.09µs ± 0%    4.06µs ± 0%  -0.83%  (p=0.000 n=28+30)
GobDecode-4                55.0ms ± 5%    55.4ms ± 5%    ~     (p=0.307 n=30+30)
GobEncode-4                51.2ms ± 1%    51.9ms ± 1%  +1.23%  (p=0.000 n=29+30)
Gzip-4                      2.64s ± 0%     2.60s ± 0%  -1.35%  (p=0.000 n=30+29)
Gunzip-4                    309ms ± 0%     308ms ± 0%  -0.27%  (p=0.000 n=30+30)
HTTPClientServer-4         1.03ms ± 5%    1.02ms ± 4%    ~     (p=0.117 n=30+29)
JSONEncode-4                101ms ± 2%     101ms ± 2%    ~     (p=0.338 n=29+29)
JSONDecode-4                383ms ± 2%     382ms ± 2%    ~     (p=0.751 n=26+30)
Mandelbrot200-4            18.4ms ± 0%    18.4ms ± 0%  -0.10%  (p=0.000 n=29+29)
GoParse-4                  22.6ms ± 0%    22.5ms ± 0%  -0.39%  (p=0.000 n=30+30)
RegexpMatchEasy0_32-4       761ns ± 0%     750ns ± 0%  -1.47%  (p=0.000 n=26+29)
RegexpMatchEasy0_1K-4      4.33µs ± 0%    4.34µs ± 0%  +0.27%  (p=0.000 n=25+28)
RegexpMatchEasy1_32-4       809ns ± 0%     795ns ± 0%  -1.74%  (p=0.000 n=27+25)
RegexpMatchEasy1_1K-4      5.54µs ± 0%    5.53µs ± 0%  -0.18%  (p=0.000 n=29+29)
RegexpMatchMedium_32-4     1.11µs ± 0%    1.08µs ± 0%  -2.78%  (p=0.000 n=27+29)
RegexpMatchMedium_1K-4      255µs ± 0%     255µs ± 0%  -0.02%  (p=0.029 n=30+30)
RegexpMatchHard_32-4       14.7µs ± 0%    14.7µs ± 0%  -0.28%  (p=0.000 n=30+29)
RegexpMatchHard_1K-4        439µs ± 0%     439µs ± 0%    ~     (p=0.907 n=23+27)
Revcomp-4                  41.9ms ± 1%    41.9ms ± 1%    ~     (p=0.230 n=28+30)
Template-4                  522ms ± 1%     528ms ± 1%  +1.25%  (p=0.000 n=30+30)
TimeParse-4                3.34µs ± 0%    3.35µs ± 0%  +0.23%  (p=0.000 n=30+27)
TimeFormat-4               6.06µs ± 0%    6.13µs ± 0%  +1.08%  (p=0.000 n=29+29)
[Geo mean]                  384µs          382µs       -0.37%

name                     old speed      new speed      delta
GobDecode-4              14.0MB/s ± 5%  13.9MB/s ± 5%    ~     (p=0.308 n=30+30)
GobEncode-4              15.0MB/s ± 1%  14.8MB/s ± 1%  -1.22%  (p=0.000 n=29+30)
Gzip-4                   7.36MB/s ± 0%  7.46MB/s ± 0%  +1.35%  (p=0.000 n=30+30)
Gunzip-4                 62.8MB/s ± 0%  63.0MB/s ± 0%  +0.27%  (p=0.000 n=30+30)
JSONEncode-4             19.2MB/s ± 2%  19.2MB/s ± 2%    ~     (p=0.312 n=29+29)
JSONDecode-4             5.05MB/s ± 3%  5.08MB/s ± 2%    ~     (p=0.356 n=29+30)
GoParse-4                2.56MB/s ± 0%  2.57MB/s ± 0%  +0.39%  (p=0.000 n=23+27)
RegexpMatchEasy0_32-4    42.0MB/s ± 0%  42.6MB/s ± 0%  +1.50%  (p=0.000 n=26+28)
RegexpMatchEasy0_1K-4     236MB/s ± 0%   236MB/s ± 0%  -0.27%  (p=0.000 n=25+28)
RegexpMatchEasy1_32-4    39.6MB/s ± 0%  40.2MB/s ± 0%  +1.73%  (p=0.000 n=27+27)
RegexpMatchEasy1_1K-4     185MB/s ± 0%   185MB/s ± 0%  +0.18%  (p=0.000 n=29+29)
RegexpMatchMedium_32-4    900kB/s ± 0%   920kB/s ± 0%  +2.22%  (p=0.000 n=29+29)
RegexpMatchMedium_1K-4   4.02MB/s ± 0%  4.02MB/s ± 0%  +0.07%  (p=0.004 n=30+27)
RegexpMatchHard_32-4     2.17MB/s ± 0%  2.18MB/s ± 0%  +0.46%  (p=0.000 n=30+26)
RegexpMatchHard_1K-4     2.33MB/s ± 0%  2.33MB/s ± 0%    ~     (all equal)
Revcomp-4                60.6MB/s ± 1%  60.7MB/s ± 1%    ~     (p=0.207 n=28+30)
Template-4               3.72MB/s ± 1%  3.67MB/s ± 1%  -1.23%  (p=0.000 n=30+30)
[Geo mean]               12.9MB/s       12.9MB/s       +0.29%

Change-Id: I07f497f8bb476c950dc555491d00c9066fb64a4e
Reviewed-on: https://go-review.googlesource.com/134232
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-11 14:37:51 +00:00
erifan01
204cc14bdd cmd/compile: implement non-constant rotates using ROR on arm64 
Add some rules to match the Go code like:
	y &= 63
	x << y | x >> (64-y)
or
	y &= 63
	x >> y | x << (64-y)
as a ROR instruction. Make math/bits.RotateLeft faster on arm64.

Extends CL 132435 to arm64.

Benchmarks of math/bits.RotateLeftxxN:
name            old time/op       new time/op       delta
RotateLeft-8    3.548750ns +- 1%  2.003750ns +- 0%  -43.54%  (p=0.000 n=8+8)
RotateLeft8-8   3.925000ns +- 0%  3.925000ns +- 0%     ~     (p=1.000 n=8+8)
RotateLeft16-8  3.925000ns +- 0%  3.927500ns +- 0%     ~     (p=0.608 n=8+8)
RotateLeft32-8  3.925000ns +- 0%  2.002500ns +- 0%  -48.98%  (p=0.000 n=8+8)
RotateLeft64-8  3.536250ns +- 0%  2.003750ns +- 0%  -43.34%  (p=0.000 n=8+8)

Change-Id: I77622cd7f39b917427e060647321f5513973232c
Reviewed-on: https://go-review.googlesource.com/122542
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-07 14:52:02 +00:00
Ben Shi
031a35ec84 cmd/compile: optimize 386's comparison 
Optimization of "(CMPconst [0] (ANDL x y)) -> (TESTL x y)" only
get benefits if there is no further use of the result of x&y. A
condition of uses==1 will have slight improvements.

1. The code size of pkg/linux_386 decreases about 300 bytes, excluding
cmd/compile/.

2. The go1 benchmark shows no regression, and even a slight improvement
in test case FmtFprintfEmpty-4, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              3.34s ± 3%     3.32s ± 2%    ~     (p=0.197 n=30+30)
Fannkuch11-4                3.48s ± 2%     3.47s ± 1%  -0.33%  (p=0.015 n=30+30)
FmtFprintfEmpty-4          46.3ns ± 4%    44.8ns ± 4%  -3.33%  (p=0.000 n=30+30)
FmtFprintfString-4         78.8ns ± 7%    77.3ns ± 5%    ~     (p=0.098 n=30+26)
FmtFprintfInt-4            90.2ns ± 1%    90.0ns ± 7%  -0.23%  (p=0.027 n=18+30)
FmtFprintfIntInt-4          144ns ± 4%     143ns ± 5%    ~     (p=0.945 n=30+29)
FmtFprintfPrefixedInt-4     180ns ± 4%     180ns ± 5%    ~     (p=0.858 n=30+30)
FmtFprintfFloat-4           409ns ± 4%     406ns ± 3%  -0.87%  (p=0.028 n=30+30)
FmtManyArgs-4               611ns ± 5%     608ns ± 4%    ~     (p=0.812 n=30+30)
GobDecode-4                7.30ms ± 5%    7.26ms ± 5%    ~     (p=0.522 n=30+29)
GobEncode-4                6.90ms ± 7%    6.82ms ± 4%    ~     (p=0.086 n=29+28)
Gzip-4                      396ms ± 4%     400ms ± 4%  +0.99%  (p=0.026 n=30+30)
Gunzip-4                   41.1ms ± 3%    41.2ms ± 3%    ~     (p=0.495 n=30+30)
HTTPClientServer-4         63.7µs ± 3%    63.3µs ± 2%    ~     (p=0.113 n=29+29)
JSONEncode-4               16.1ms ± 2%    16.1ms ± 2%  -0.30%  (p=0.041 n=30+30)
JSONDecode-4               60.9ms ± 3%    61.2ms ± 6%    ~     (p=0.187 n=30+30)
Mandelbrot200-4            5.17ms ± 2%    5.19ms ± 3%    ~     (p=0.676 n=30+30)
GoParse-4                  3.28ms ± 3%    3.25ms ± 2%  -0.97%  (p=0.002 n=30+30)
RegexpMatchEasy0_32-4       103ns ± 4%     104ns ± 4%    ~     (p=0.352 n=30+30)
RegexpMatchEasy0_1K-4       849ns ± 2%     845ns ± 2%    ~     (p=0.381 n=30+30)
RegexpMatchEasy1_32-4       113ns ± 4%     113ns ± 4%    ~     (p=0.795 n=30+30)
RegexpMatchEasy1_1K-4      1.03µs ± 3%    1.03µs ± 4%    ~     (p=0.275 n=25+30)
RegexpMatchMedium_32-4      132ns ± 3%     132ns ± 3%    ~     (p=0.970 n=30+30)
RegexpMatchMedium_1K-4     41.4µs ± 3%    41.4µs ± 3%    ~     (p=0.212 n=30+30)
RegexpMatchHard_32-4       2.22µs ± 4%    2.22µs ± 4%    ~     (p=0.399 n=30+30)
RegexpMatchHard_1K-4       67.2µs ± 3%    67.6µs ± 4%    ~     (p=0.359 n=30+30)
Revcomp-4                   1.84s ± 2%     1.83s ± 2%    ~     (p=0.532 n=30+30)
Template-4                 69.1ms ± 4%    68.8ms ± 3%    ~     (p=0.146 n=30+30)
TimeParse-4                 441ns ± 3%     442ns ± 3%    ~     (p=0.154 n=30+30)
TimeFormat-4                413ns ± 3%     414ns ± 3%    ~     (p=0.275 n=30+30)
[Geo mean]                 66.2µs         66.0µs       -0.28%

name                     old speed      new speed      delta
GobDecode-4               105MB/s ± 5%   106MB/s ± 5%    ~     (p=0.514 n=30+29)
GobEncode-4               111MB/s ± 5%   113MB/s ± 4%  +1.37%  (p=0.046 n=28+28)
Gzip-4                   49.1MB/s ± 4%  48.6MB/s ± 4%  -0.98%  (p=0.028 n=30+30)
Gunzip-4                  472MB/s ± 4%   472MB/s ± 3%    ~     (p=0.496 n=30+30)
JSONEncode-4              120MB/s ± 2%   121MB/s ± 2%  +0.29%  (p=0.042 n=30+30)
JSONDecode-4             31.9MB/s ± 3%  31.7MB/s ± 6%    ~     (p=0.186 n=30+30)
GoParse-4                17.6MB/s ± 3%  17.8MB/s ± 2%  +0.98%  (p=0.002 n=30+30)
RegexpMatchEasy0_32-4     309MB/s ± 4%   307MB/s ± 4%    ~     (p=0.501 n=30+30)
RegexpMatchEasy0_1K-4    1.21GB/s ± 2%  1.21GB/s ± 2%    ~     (p=0.301 n=30+30)
RegexpMatchEasy1_32-4     283MB/s ± 4%   282MB/s ± 3%    ~     (p=0.877 n=30+30)
RegexpMatchEasy1_1K-4    1.00GB/s ± 3%  0.99GB/s ± 4%    ~     (p=0.276 n=25+30)
RegexpMatchMedium_32-4   7.54MB/s ± 3%  7.55MB/s ± 3%    ~     (p=0.528 n=30+30)
RegexpMatchMedium_1K-4   24.7MB/s ± 3%  24.7MB/s ± 3%    ~     (p=0.203 n=30+30)
RegexpMatchHard_32-4     14.4MB/s ± 4%  14.4MB/s ± 4%    ~     (p=0.407 n=30+30)
RegexpMatchHard_1K-4     15.3MB/s ± 3%  15.1MB/s ± 4%    ~     (p=0.306 n=30+30)
Revcomp-4                 138MB/s ± 2%   139MB/s ± 2%    ~     (p=0.520 n=30+30)
Template-4               28.1MB/s ± 4%  28.2MB/s ± 3%    ~     (p=0.149 n=30+30)
[Geo mean]               81.5MB/s       81.5MB/s       +0.06%

Change-Id: I7f75425f79eec93cdd8fdd94db13ad4f61b6a2f5
Reviewed-on: https://go-review.googlesource.com/133657
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-09-07 01:20:45 +00:00
fanzha02
2e5c32518c cmd/compile: optimize math.Copysign on arm64 
Add rewrite rules to optimize math.Copysign() when the second
argument is negative floating point constant.

For example, math.Copysign(c, -2): The previous compile output is
"AND $9223372036854775807, R0, R0; ORR $-9223372036854775808, R0, R0".
The optimized compile output is "ORR $-9223372036854775808, R0, R0"

Math package benchmark results.
name                   old time/op  new time/op  delta
Copysign-8             2.61ns ± 2%  2.49ns ± 0%  -4.55%  (p=0.000 n=10+10)
Cos-8                  43.0ns ± 0%  41.5ns ± 0%  -3.49%  (p=0.000 n=10+10)
Cosh-8                 98.6ns ± 0%  98.1ns ± 0%  -0.51%  (p=0.000 n=10+10)
ExpGo-8                 107ns ± 0%   105ns ± 0%  -1.87%  (p=0.000 n=10+10)
Exp2Go-8                100ns ± 0%   100ns ± 0%  +0.39%  (p=0.000 n=10+8)
Max-8                  6.56ns ± 2%  6.45ns ± 1%  -1.63%  (p=0.002 n=10+10)
Min-8                  6.66ns ± 3%  6.47ns ± 2%  -2.82%  (p=0.006 n=10+10)
Mod-8                   107ns ± 1%   104ns ± 1%  -2.72%  (p=0.000 n=10+10)
Frexp-8                11.5ns ± 1%  11.0ns ± 0%  -4.56%  (p=0.000 n=8+10)
HypotGo-8              19.4ns ± 0%  19.4ns ± 0%  +0.36%  (p=0.019 n=10+10)
Ilogb-8                8.63ns ± 0%  8.51ns ± 0%  -1.36%  (p=0.000 n=10+10)
Jn-8                    584ns ± 0%   585ns ± 0%  +0.17%  (p=0.000 n=7+8)
Ldexp-8                13.8ns ± 0%  13.5ns ± 0%  -2.17%  (p=0.002 n=8+10)
Logb-8                 10.2ns ± 0%   9.9ns ± 0%  -2.65%  (p=0.000 n=10+7)
Nextafter64-8          7.54ns ± 0%  7.51ns ± 0%  -0.37%  (p=0.000 n=10+10)
Remainder-8            73.5ns ± 1%  70.4ns ± 1%  -4.27%  (p=0.000 n=10+10)
SqrtGoLatency-8        79.6ns ± 0%  76.2ns ± 0%  -4.30%  (p=0.000 n=9+10)
Yn-8                    582ns ± 0%   579ns ± 0%  -0.52%  (p=0.000 n=10+10)

Change-Id: I0c9cd1ea87435e7b8bab94b4e79e6e29785f25b1
Reviewed-on: https://go-review.googlesource.com/132915
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-09-06 19:57:25 +00:00
Ben Shi
067dfce21f cmd/compile: optimize ARM's comparision 
Optimize (CMPconst [0] (ADD x y)) to (CMN x y) will only get benefits
when the result of the addition is no longer used, otherwise there
might be even performance drop. And this CL fixes that issue for
CMP/CMN/TST/TEQ.

There is little regression in the go1 benchmark (excluding noise),
and the test case JSONDecode-4 even gets improvement.

name                     old time/op    new time/op    delta
BinaryTree17-4              21.6s ± 1%     21.6s ± 0%  -0.22%  (p=0.013 n=30+30)
Fannkuch11-4                11.1s ± 0%     11.1s ± 0%  +0.11%  (p=0.000 n=30+29)
FmtFprintfEmpty-4           297ns ± 0%     297ns ± 0%  +0.08%  (p=0.007 n=26+28)
FmtFprintfString-4          589ns ± 1%     589ns ± 0%    ~     (p=0.659 n=30+25)
FmtFprintfInt-4             644ns ± 1%     650ns ± 0%  +0.88%  (p=0.000 n=30+24)
FmtFprintfIntInt-4          964ns ± 0%     977ns ± 0%  +1.33%  (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4    1.06µs ± 0%    1.07µs ± 0%  +1.31%  (p=0.000 n=29+27)
FmtFprintfFloat-4          1.89µs ± 0%    1.92µs ± 0%  +1.25%  (p=0.000 n=29+29)
FmtManyArgs-4              3.63µs ± 0%    3.67µs ± 0%  +1.33%  (p=0.000 n=29+27)
GobDecode-4                38.1ms ± 1%    37.9ms ± 1%  -0.60%  (p=0.000 n=29+29)
GobEncode-4                35.3ms ± 2%    35.2ms ± 1%    ~     (p=0.286 n=30+30)
Gzip-4                      2.36s ± 0%     2.37s ± 2%    ~     (p=0.277 n=24+28)
Gunzip-4                    264ms ± 1%     264ms ± 1%    ~     (p=0.104 n=28+30)
HTTPClientServer-4         1.04ms ± 4%    1.02ms ± 4%  -1.65%  (p=0.000 n=28+28)
JSONEncode-4               78.5ms ± 1%    79.6ms ± 1%  +1.34%  (p=0.000 n=27+28)
JSONDecode-4                379ms ± 4%     352ms ± 5%  -7.09%  (p=0.000 n=29+30)
Mandelbrot200-4            17.6ms ± 0%    17.6ms ± 0%    ~     (p=0.206 n=28+29)
GoParse-4                  21.9ms ± 1%    22.1ms ± 1%  +0.87%  (p=0.000 n=28+26)
RegexpMatchEasy0_32-4       631ns ± 0%     641ns ± 0%  +1.63%  (p=0.000 n=29+30)
RegexpMatchEasy0_1K-4      4.11µs ± 0%    4.11µs ± 0%    ~     (p=0.700 n=30+30)
RegexpMatchEasy1_32-4       670ns ± 0%     679ns ± 0%  +1.37%  (p=0.000 n=21+30)
RegexpMatchEasy1_1K-4      5.31µs ± 0%    5.26µs ± 0%  -1.03%  (p=0.000 n=25+28)
RegexpMatchMedium_32-4      905ns ± 0%     906ns ± 0%  +0.14%  (p=0.001 n=30+30)
RegexpMatchMedium_1K-4      192µs ± 0%     191µs ± 0%  -0.45%  (p=0.000 n=29+27)
RegexpMatchHard_32-4       11.8µs ± 0%    11.7µs ± 0%  -0.39%  (p=0.000 n=29+28)
RegexpMatchHard_1K-4        347µs ± 0%     347µs ± 0%    ~     (p=0.084 n=29+30)
Revcomp-4                  37.5ms ± 1%    37.5ms ± 1%    ~     (p=0.279 n=29+29)
Template-4                  519ms ± 2%     519ms ± 2%    ~     (p=0.652 n=28+29)
TimeParse-4                2.83µs ± 0%    2.78µs ± 0%  -1.90%  (p=0.000 n=27+28)
TimeFormat-4               5.79µs ± 0%    5.60µs ± 0%  -3.23%  (p=0.000 n=29+29)
[Geo mean]                  331µs          330µs       -0.16%

name                     old speed      new speed      delta
GobDecode-4              20.1MB/s ± 1%  20.3MB/s ± 1%  +0.61%  (p=0.000 n=29+29)
GobEncode-4              21.7MB/s ± 2%  21.8MB/s ± 1%    ~     (p=0.294 n=30+30)
Gzip-4                   8.23MB/s ± 1%  8.20MB/s ± 2%    ~     (p=0.099 n=26+28)
Gunzip-4                 73.5MB/s ± 1%  73.4MB/s ± 1%    ~     (p=0.107 n=28+30)
JSONEncode-4             24.7MB/s ± 1%  24.4MB/s ± 1%  -1.32%  (p=0.000 n=27+28)
JSONDecode-4             5.13MB/s ± 4%  5.52MB/s ± 5%  +7.65%  (p=0.000 n=29+30)
GoParse-4                2.65MB/s ± 1%  2.63MB/s ± 1%  -0.87%  (p=0.000 n=28+26)
RegexpMatchEasy0_32-4    50.7MB/s ± 0%  49.9MB/s ± 0%  -1.58%  (p=0.000 n=29+29)
RegexpMatchEasy0_1K-4     249MB/s ± 0%   249MB/s ± 0%    ~     (p=0.342 n=30+28)
RegexpMatchEasy1_32-4    47.7MB/s ± 0%  47.1MB/s ± 0%  -1.39%  (p=0.000 n=26+30)
RegexpMatchEasy1_1K-4     193MB/s ± 0%   195MB/s ± 0%  +1.04%  (p=0.000 n=25+28)
RegexpMatchMedium_32-4   1.10MB/s ± 0%  1.10MB/s ± 0%  -0.42%  (p=0.000 n=30+26)
RegexpMatchMedium_1K-4   5.33MB/s ± 0%  5.36MB/s ± 0%  +0.43%  (p=0.000 n=29+29)
RegexpMatchHard_32-4     2.72MB/s ± 0%  2.73MB/s ± 0%  +0.37%  (p=0.000 n=29+30)
RegexpMatchHard_1K-4     2.95MB/s ± 0%  2.95MB/s ± 0%    ~     (all equal)
Revcomp-4                67.8MB/s ± 1%  67.7MB/s ± 1%    ~     (p=0.273 n=29+29)
Template-4               3.74MB/s ± 2%  3.74MB/s ± 2%    ~     (p=0.665 n=28+29)
[Geo mean]               15.2MB/s       15.2MB/s       +0.21%

Change-Id: Ifed1fb8cc02d5ca52c8bc6c21b6b5bf6dbb2701a
Reviewed-on: https://go-review.googlesource.com/132115
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-05 14:54:08 +00:00
Michael Munday
f94de9c9fb cmd/compile: make math/bits.RotateLeft{32,64} intrinsics on s390x 
Extends CL 132435 to s390x. s390x has 32- and 64-bit variable
rotate left instructions.

Change-Id: Ic4f1ebb0e0543207ed2fc8c119e0163b428138a5
Reviewed-on: https://go-review.googlesource.com/133035
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-05 08:29:02 +00:00
Ben Shi
0e9f1de0b7 cmd/compile: optimize arm64's comparison 
Add more optimization with TST/CMN.

1. A tiny benchmark shows more than 12% improvement.
TSTCMN-4                    378µs ± 0%     332µs ± 0%  -12.15%  (p=0.000 n=30+27)
(https://github.com/benshi001/ugo1/blob/master/tstcmn_test.go)

2. There is little regression in the go1 benchmark, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              19.1s ± 0%     19.1s ± 0%    ~     (p=0.994 n=28+29)
Fannkuch11-4                10.0s ± 0%     10.0s ± 0%    ~     (p=0.198 n=30+25)
FmtFprintfEmpty-4           233ns ± 0%     233ns ± 0%  +0.14%  (p=0.002 n=24+30)
FmtFprintfString-4          428ns ± 0%     428ns ± 0%    ~     (all equal)
FmtFprintfInt-4             472ns ± 0%     472ns ± 0%    ~     (all equal)
FmtFprintfIntInt-4          725ns ± 0%     725ns ± 0%    ~     (all equal)
FmtFprintfPrefixedInt-4     889ns ± 0%     888ns ± 0%    ~     (p=0.632 n=28+30)
FmtFprintfFloat-4          1.20µs ± 0%    1.20µs ± 0%  +0.05%  (p=0.001 n=18+30)
FmtManyArgs-4              3.00µs ± 0%    2.99µs ± 0%  -0.07%  (p=0.001 n=27+30)
GobDecode-4                42.1ms ± 0%    42.2ms ± 0%  +0.29%  (p=0.000 n=28+28)
GobEncode-4                38.6ms ± 9%    38.8ms ± 9%    ~     (p=0.912 n=30+30)
Gzip-4                      2.07s ± 1%     2.05s ± 1%  -0.64%  (p=0.000 n=29+30)
Gunzip-4                    175ms ± 0%     175ms ± 0%  -0.15%  (p=0.001 n=30+30)
HTTPClientServer-4          872µs ± 5%     880µs ± 6%    ~     (p=0.196 n=30+29)
JSONEncode-4               88.5ms ± 1%    89.8ms ± 1%  +1.49%  (p=0.000 n=23+24)
JSONDecode-4                393ms ± 1%     390ms ± 1%  -0.89%  (p=0.000 n=28+30)
Mandelbrot200-4            19.5ms ± 0%    19.5ms ± 0%    ~     (p=0.405 n=29+28)
GoParse-4                  19.9ms ± 0%    20.0ms ± 0%  +0.27%  (p=0.000 n=30+30)
RegexpMatchEasy0_32-4       431ns ± 0%     431ns ± 0%    ~     (p=1.000 n=30+30)
RegexpMatchEasy0_1K-4      1.61µs ± 0%    1.61µs ± 0%    ~     (p=0.527 n=26+26)
RegexpMatchEasy1_32-4       443ns ± 0%     443ns ± 0%    ~     (all equal)
RegexpMatchEasy1_1K-4      2.58µs ± 1%    2.58µs ± 1%    ~     (p=0.578 n=27+25)
RegexpMatchMedium_32-4      740ns ± 0%     740ns ± 0%    ~     (p=0.357 n=30+30)
RegexpMatchMedium_1K-4      223µs ± 0%     223µs ± 0%  +0.16%  (p=0.000 n=30+29)
RegexpMatchHard_32-4       12.3µs ± 0%    12.3µs ± 0%    ~     (p=0.236 n=27+27)
RegexpMatchHard_1K-4        371µs ± 0%     371µs ± 0%  +0.09%  (p=0.000 n=30+27)
Revcomp-4                   2.85s ± 0%     2.85s ± 0%    ~     (p=0.057 n=28+25)
Template-4                  408ms ± 1%     409ms ± 1%    ~     (p=0.117 n=29+29)
TimeParse-4                1.93µs ± 0%    1.93µs ± 0%    ~     (p=0.535 n=29+28)
TimeFormat-4               1.99µs ± 0%    1.99µs ± 0%    ~     (p=0.168 n=29+28)
[Geo mean]                  306µs          307µs       +0.07%

name                     old speed      new speed      delta
GobDecode-4              18.3MB/s ± 0%  18.2MB/s ± 0%  -0.31%  (p=0.000 n=28+29)
GobEncode-4              19.9MB/s ± 8%  19.8MB/s ± 9%    ~     (p=0.923 n=30+30)
Gzip-4                   9.39MB/s ± 1%  9.45MB/s ± 1%  +0.65%  (p=0.000 n=29+30)
Gunzip-4                  111MB/s ± 0%   111MB/s ± 0%  +0.15%  (p=0.001 n=30+30)
JSONEncode-4             21.9MB/s ± 1%  21.6MB/s ± 1%  -1.45%  (p=0.000 n=23+23)
JSONDecode-4             4.94MB/s ± 1%  4.98MB/s ± 1%  +0.84%  (p=0.000 n=27+30)
GoParse-4                2.91MB/s ± 0%  2.90MB/s ± 0%  -0.34%  (p=0.000 n=21+22)
RegexpMatchEasy0_32-4    74.1MB/s ± 0%  74.1MB/s ± 0%    ~     (p=0.469 n=29+28)
RegexpMatchEasy0_1K-4     634MB/s ± 0%   634MB/s ± 0%    ~     (p=0.978 n=24+28)
RegexpMatchEasy1_32-4    72.2MB/s ± 0%  72.2MB/s ± 0%    ~     (p=0.064 n=27+29)
RegexpMatchEasy1_1K-4     396MB/s ± 1%   396MB/s ± 1%    ~     (p=0.583 n=27+25)
RegexpMatchMedium_32-4   1.35MB/s ± 0%  1.35MB/s ± 0%    ~     (all equal)
RegexpMatchMedium_1K-4   4.60MB/s ± 0%  4.59MB/s ± 0%  -0.14%  (p=0.000 n=30+26)
RegexpMatchHard_32-4     2.61MB/s ± 0%  2.61MB/s ± 0%    ~     (all equal)
RegexpMatchHard_1K-4     2.76MB/s ± 0%  2.76MB/s ± 0%    ~     (all equal)
Revcomp-4                89.1MB/s ± 0%  89.1MB/s ± 0%    ~     (p=0.059 n=28+25)
Template-4               4.75MB/s ± 1%  4.75MB/s ± 1%    ~     (p=0.106 n=29+29)
[Geo mean]               18.3MB/s       18.3MB/s       -0.07%

Change-Id: I3cd76ce63e84b0c3cebabf9fa3573b76a7343899
Reviewed-on: https://go-review.googlesource.com/124935
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-05 02:51:28 +00:00
Ben Shi
b444215116 cmd/compile: optimize ARM64's code with MADD/MSUB 
MADD does MUL-ADD in a single instruction, and MSUB does the
similiar simplification for MUL-SUB.

The CL implements the optimization with MADD/MSUB.

1. The total size of pkg/android_arm64/ decreases about 20KB,
excluding cmd/compile/.

2. The go1 benchmark shows a little improvement for RegexpMatchHard_32-4
and Template-4, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              16.3s ± 1%     16.5s ± 1%  +1.41%  (p=0.000 n=26+28)
Fannkuch11-4                8.79s ± 1%     8.76s ± 0%  -0.36%  (p=0.000 n=26+28)
FmtFprintfEmpty-4           172ns ± 0%     172ns ± 0%    ~     (all equal)
FmtFprintfString-4          362ns ± 1%     364ns ± 0%  +0.55%  (p=0.000 n=30+30)
FmtFprintfInt-4             416ns ± 0%     416ns ± 0%    ~     (p=0.099 n=22+30)
FmtFprintfIntInt-4          655ns ± 1%     660ns ± 1%  +0.76%  (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4     810ns ± 0%     809ns ± 0%  -0.08%  (p=0.009 n=29+29)
FmtFprintfFloat-4          1.08µs ± 0%    1.09µs ± 0%  +0.61%  (p=0.000 n=30+29)
FmtManyArgs-4              2.70µs ± 0%    2.69µs ± 0%  -0.23%  (p=0.000 n=29+28)
GobDecode-4                32.2ms ± 1%    32.1ms ± 1%  -0.39%  (p=0.000 n=27+26)
GobEncode-4                27.4ms ± 2%    27.4ms ± 1%    ~     (p=0.864 n=28+28)
Gzip-4                      1.53s ± 1%     1.52s ± 1%  -0.30%  (p=0.031 n=29+29)
Gunzip-4                    146ms ± 0%     146ms ± 0%  -0.14%  (p=0.001 n=25+30)
HTTPClientServer-4         1.00ms ± 4%    0.98ms ± 6%  -1.65%  (p=0.001 n=29+30)
JSONEncode-4               67.3ms ± 1%    67.2ms ± 1%    ~     (p=0.520 n=28+28)
JSONDecode-4                329ms ± 5%     330ms ± 4%    ~     (p=0.142 n=30+30)
Mandelbrot200-4            17.3ms ± 0%    17.3ms ± 0%    ~     (p=0.055 n=26+29)
GoParse-4                  16.9ms ± 1%    17.0ms ± 1%  +0.82%  (p=0.000 n=30+30)
RegexpMatchEasy0_32-4       382ns ± 0%     382ns ± 0%    ~     (all equal)
RegexpMatchEasy0_1K-4      1.33µs ± 0%    1.33µs ± 0%  -0.25%  (p=0.000 n=30+27)
RegexpMatchEasy1_32-4       361ns ± 0%     361ns ± 0%  -0.08%  (p=0.002 n=30+28)
RegexpMatchEasy1_1K-4      2.11µs ± 0%    2.09µs ± 0%  -0.54%  (p=0.000 n=30+29)
RegexpMatchMedium_32-4      594ns ± 0%     592ns ± 0%  -0.32%  (p=0.000 n=30+30)
RegexpMatchMedium_1K-4      173µs ± 0%     172µs ± 0%  -0.77%  (p=0.000 n=29+27)
RegexpMatchHard_32-4       10.4µs ± 0%    10.1µs ± 0%  -3.63%  (p=0.000 n=28+27)
RegexpMatchHard_1K-4        306µs ± 0%     301µs ± 0%  -1.64%  (p=0.000 n=29+30)
Revcomp-4                   2.51s ± 1%     2.52s ± 0%  +0.18%  (p=0.017 n=26+27)
Template-4                  394ms ± 3%     382ms ± 3%  -3.22%  (p=0.000 n=28+28)
TimeParse-4                1.67µs ± 0%    1.67µs ± 0%  +0.05%  (p=0.030 n=27+30)
TimeFormat-4               1.72µs ± 0%    1.70µs ± 0%  -0.79%  (p=0.000 n=28+26)
[Geo mean]                  259µs          259µs       -0.33%

name                     old speed      new speed      delta
GobDecode-4              23.8MB/s ± 1%  23.9MB/s ± 1%  +0.40%  (p=0.001 n=27+26)
GobEncode-4              28.0MB/s ± 2%  28.0MB/s ± 1%    ~     (p=0.863 n=28+28)
Gzip-4                   12.7MB/s ± 1%  12.7MB/s ± 1%  +0.32%  (p=0.026 n=29+29)
Gunzip-4                  133MB/s ± 0%   133MB/s ± 0%  +0.15%  (p=0.001 n=24+30)
JSONEncode-4             28.8MB/s ± 1%  28.9MB/s ± 1%    ~     (p=0.475 n=28+28)
JSONDecode-4             5.89MB/s ± 4%  5.87MB/s ± 5%    ~     (p=0.174 n=29+30)
GoParse-4                3.43MB/s ± 0%  3.40MB/s ± 1%  -0.83%  (p=0.000 n=28+30)
RegexpMatchEasy0_32-4    83.6MB/s ± 0%  83.6MB/s ± 0%    ~     (p=0.848 n=28+29)
RegexpMatchEasy0_1K-4     768MB/s ± 0%   770MB/s ± 0%  +0.25%  (p=0.000 n=30+27)
RegexpMatchEasy1_32-4    88.5MB/s ± 0%  88.5MB/s ± 0%    ~     (p=0.086 n=29+29)
RegexpMatchEasy1_1K-4     486MB/s ± 0%   489MB/s ± 0%  +0.54%  (p=0.000 n=30+29)
RegexpMatchMedium_32-4   1.68MB/s ± 0%  1.69MB/s ± 0%  +0.60%  (p=0.000 n=30+23)
RegexpMatchMedium_1K-4   5.90MB/s ± 0%  5.95MB/s ± 0%  +0.85%  (p=0.000 n=18+20)
RegexpMatchHard_32-4     3.07MB/s ± 0%  3.18MB/s ± 0%  +3.72%  (p=0.000 n=29+26)
RegexpMatchHard_1K-4     3.35MB/s ± 0%  3.40MB/s ± 0%  +1.69%  (p=0.000 n=30+30)
Revcomp-4                 101MB/s ± 0%   101MB/s ± 0%  -0.18%  (p=0.018 n=26+27)
Template-4               4.92MB/s ± 4%  5.09MB/s ± 3%  +3.31%  (p=0.000 n=28+28)
[Geo mean]               22.4MB/s       22.6MB/s       +0.62%

Change-Id: I8f304b272785739f57b3c8f736316f658f8c1b2a
Reviewed-on: https://go-review.googlesource.com/129119
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-04 20:41:58 +00:00
Michael Munday
6f9b94ab66 cmd/compile: implement OnesCount{8,16,32,64} intrinsics on s390x 
This CL implements the math/bits.OnesCount{8,16,32,64} functions
as intrinsics on s390x using the 'population count' (popcnt)
instruction. This instruction was released as the 'population-count'
facility which uses the same facility bit (45) as the
'distinct-operands' facility which is a pre-requisite for Go on
s390x. We can therefore use it without a feature check.

The s390x popcnt instruction treats a 64 bit register as a vector
of 8 bytes, summing the number of ones in each byte individually.
It then writes the results to the corresponding bytes in the
output register. Therefore to implement OnesCount{16,32,64} we
need to sum the individual byte counts using some extra
instructions. To do this efficiently I've added some additional
pseudo operations to the s390x SSA backend.

Unlike other architectures the new instruction sequence is faster
for OnesCount8, so that is implemented using the intrinsic.

name         old time/op  new time/op  delta
OnesCount    3.21ns ± 1%  1.35ns ± 0%  -58.00%  (p=0.000 n=20+20)
OnesCount8   0.91ns ± 1%  0.81ns ± 0%  -11.43%  (p=0.000 n=20+20)
OnesCount16  1.51ns ± 3%  1.21ns ± 0%  -19.71%  (p=0.000 n=20+17)
OnesCount32  1.91ns ± 0%  1.12ns ± 1%  -41.60%  (p=0.000 n=19+20)
OnesCount64  3.18ns ± 4%  1.35ns ± 0%  -57.52%  (p=0.000 n=20+20)

Change-Id: Id54f0bd28b6db9a887ad12c0d72fcc168ef9c4e0
Reviewed-on: https://go-review.googlesource.com/114675
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-09-03 14:35:38 +00:00
Giovanni Bajo
f02cc88f46 test: relax whitespaces matching in codegen tests 
The codegen testsuite uses regexp to parse the syntax, but it doesn't
have a way to tell line comments containing checks from line comments
containing English sentences. This means that any syntax error (that
is, non-matching regexp) is currently ignored and not reported.

There were some tests in memcombine.go that had an extraneous space
and were thus effectively disabled. It would be great if we could
report it as a syntax error, but for now we just punt and swallow the
spaces as a workaround, to avoid the same mistake again.

Fixes #25452

Change-Id: Ic7747a2278bc00adffd0c199ce40937acbbc9cf0
Reviewed-on: https://go-review.googlesource.com/113835
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-09-02 10:31:37 +00:00
Zheng Xu
8f4fd3f34e build: support frame-pointer for arm64 
Supporting frame-pointer makes Linux's perf and other profilers much more useful
because it lets them gather a stack trace efficiently on profiling events. Major
changes include:
1. save FP on the word below where RSP is pointing to (proposed by Cherry and Austin)
2. adjust some specific offsets in runtime assembly and wrapper code
3. add support to FP in goroutine scheduler
4. adjust link stack overflow check to take the extra word into account
5. adjust nosplit test cases to enable frame sizes which are 16 bytes aligned

Performance impacts on go1 benchmarks:

Enable frame-pointer (by default)

name                      old time/op    new time/op    delta
BinaryTree17-46              5.94s ± 0%     6.00s ± 0%  +1.03%  (p=0.029 n=4+4)
Fannkuch11-46                2.84s ± 1%     2.77s ± 0%  -2.58%  (p=0.008 n=5+5)
FmtFprintfEmpty-46          55.0ns ± 1%    58.9ns ± 1%  +7.06%  (p=0.008 n=5+5)
FmtFprintfString-46          102ns ± 0%     105ns ± 0%  +2.94%  (p=0.008 n=5+5)
FmtFprintfInt-46             118ns ± 0%     117ns ± 1%  -1.19%  (p=0.000 n=4+5)
FmtFprintfIntInt-46          181ns ± 0%     182ns ± 1%    ~     (p=0.444 n=5+5)
FmtFprintfPrefixedInt-46     215ns ± 1%     214ns ± 0%    ~     (p=0.254 n=5+4)
FmtFprintfFloat-46           292ns ± 0%     296ns ± 0%  +1.46%  (p=0.029 n=4+4)
FmtManyArgs-46               720ns ± 0%     732ns ± 0%  +1.72%  (p=0.008 n=5+5)
GobDecode-46                9.82ms ± 1%   10.03ms ± 2%  +2.10%  (p=0.008 n=5+5)
GobEncode-46                8.14ms ± 0%    8.72ms ± 1%  +7.14%  (p=0.008 n=5+5)
Gzip-46                      420ms ± 0%     424ms ± 0%  +0.92%  (p=0.008 n=5+5)
Gunzip-46                   48.2ms ± 0%    48.4ms ± 0%  +0.41%  (p=0.008 n=5+5)
HTTPClientServer-46          201µs ± 4%     201µs ± 0%    ~     (p=0.730 n=5+4)
JSONEncode-46               17.1ms ± 0%    17.7ms ± 1%  +3.80%  (p=0.008 n=5+5)
JSONDecode-46               88.0ms ± 0%    90.1ms ± 0%  +2.42%  (p=0.008 n=5+5)
Mandelbrot200-46            5.06ms ± 0%    5.07ms ± 0%    ~     (p=0.310 n=5+5)
GoParse-46                  5.04ms ± 0%    5.12ms ± 0%  +1.53%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-46       117ns ± 0%     117ns ± 0%    ~     (all equal)
RegexpMatchEasy0_1K-46       332ns ± 0%     329ns ± 0%  -0.78%  (p=0.008 n=5+5)
RegexpMatchEasy1_32-46       104ns ± 0%     113ns ± 0%  +8.65%  (p=0.029 n=4+4)
RegexpMatchEasy1_1K-46       563ns ± 0%     569ns ± 0%  +1.10%  (p=0.008 n=5+5)
RegexpMatchMedium_32-46      167ns ± 2%     177ns ± 1%  +5.74%  (p=0.008 n=5+5)
RegexpMatchMedium_1K-46     49.5µs ± 0%    53.4µs ± 0%  +7.81%  (p=0.008 n=5+5)
RegexpMatchHard_32-46       2.56µs ± 1%    2.72µs ± 0%  +6.01%  (p=0.008 n=5+5)
RegexpMatchHard_1K-46       77.0µs ± 0%    81.8µs ± 0%  +6.24%  (p=0.016 n=5+4)
Revcomp-46                   631ms ± 1%     627ms ± 1%    ~     (p=0.095 n=5+5)
Template-46                 81.8ms ± 0%    86.3ms ± 0%  +5.55%  (p=0.008 n=5+5)
TimeParse-46                 423ns ± 0%     432ns ± 0%  +2.32%  (p=0.008 n=5+5)
TimeFormat-46                478ns ± 2%     497ns ± 1%  +3.89%  (p=0.008 n=5+5)
[Geo mean]                  71.6µs         73.3µs       +2.45%

name                      old speed      new speed      delta
GobDecode-46              78.1MB/s ± 1%  76.6MB/s ± 2%  -2.04%  (p=0.008 n=5+5)
GobEncode-46              94.3MB/s ± 0%  88.0MB/s ± 1%  -6.67%  (p=0.008 n=5+5)
Gzip-46                   46.2MB/s ± 0%  45.8MB/s ± 0%  -0.91%  (p=0.008 n=5+5)
Gunzip-46                  403MB/s ± 0%   401MB/s ± 0%  -0.41%  (p=0.008 n=5+5)
JSONEncode-46              114MB/s ± 0%   109MB/s ± 1%  -3.66%  (p=0.008 n=5+5)
JSONDecode-46             22.0MB/s ± 0%  21.5MB/s ± 0%  -2.35%  (p=0.008 n=5+5)
GoParse-46                11.5MB/s ± 0%  11.3MB/s ± 0%  -1.51%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-46     272MB/s ± 0%   272MB/s ± 1%    ~     (p=0.190 n=4+5)
RegexpMatchEasy0_1K-46    3.08GB/s ± 0%  3.11GB/s ± 0%  +0.77%  (p=0.008 n=5+5)
RegexpMatchEasy1_32-46     306MB/s ± 0%   283MB/s ± 0%  -7.63%  (p=0.029 n=4+4)
RegexpMatchEasy1_1K-46    1.82GB/s ± 0%  1.80GB/s ± 0%  -1.07%  (p=0.008 n=5+5)
RegexpMatchMedium_32-46   5.99MB/s ± 0%  5.64MB/s ± 1%  -5.77%  (p=0.016 n=4+5)
RegexpMatchMedium_1K-46   20.7MB/s ± 0%  19.2MB/s ± 0%  -7.25%  (p=0.008 n=5+5)
RegexpMatchHard_32-46     12.5MB/s ± 1%  11.8MB/s ± 0%  -5.66%  (p=0.008 n=5+5)
RegexpMatchHard_1K-46     13.3MB/s ± 0%  12.5MB/s ± 1%  -6.01%  (p=0.008 n=5+5)
Revcomp-46                 402MB/s ± 1%   405MB/s ± 1%    ~     (p=0.095 n=5+5)
Template-46               23.7MB/s ± 0%  22.5MB/s ± 0%  -5.25%  (p=0.008 n=5+5)
[Geo mean]                82.2MB/s       79.6MB/s       -3.26%

Disable frame-pointer (GOEXPERIMENT=noframepointer)

name                      old time/op    new time/op    delta
BinaryTree17-46              5.94s ± 0%     5.96s ± 0%  +0.39%  (p=0.029 n=4+4)
Fannkuch11-46                2.84s ± 1%     2.79s ± 1%  -1.68%  (p=0.008 n=5+5)
FmtFprintfEmpty-46          55.0ns ± 1%    55.2ns ± 3%    ~     (p=0.794 n=5+5)
FmtFprintfString-46          102ns ± 0%     103ns ± 0%  +0.98%  (p=0.016 n=5+4)
FmtFprintfInt-46             118ns ± 0%     115ns ± 0%  -2.54%  (p=0.029 n=4+4)
FmtFprintfIntInt-46          181ns ± 0%     179ns ± 0%  -1.10%  (p=0.000 n=5+4)
FmtFprintfPrefixedInt-46     215ns ± 1%     213ns ± 0%    ~     (p=0.143 n=5+4)
FmtFprintfFloat-46           292ns ± 0%     300ns ± 0%  +2.83%  (p=0.029 n=4+4)
FmtManyArgs-46               720ns ± 0%     739ns ± 0%  +2.64%  (p=0.008 n=5+5)
GobDecode-46                9.82ms ± 1%    9.78ms ± 1%    ~     (p=0.151 n=5+5)
GobEncode-46                8.14ms ± 0%    8.12ms ± 1%    ~     (p=0.690 n=5+5)
Gzip-46                      420ms ± 0%     420ms ± 0%    ~     (p=0.548 n=5+5)
Gunzip-46                   48.2ms ± 0%    48.0ms ± 0%  -0.33%  (p=0.032 n=5+5)
HTTPClientServer-46          201µs ± 4%     199µs ± 3%    ~     (p=0.548 n=5+5)
JSONEncode-46               17.1ms ± 0%    17.2ms ± 0%    ~     (p=0.056 n=5+5)
JSONDecode-46               88.0ms ± 0%    88.6ms ± 0%  +0.64%  (p=0.008 n=5+5)
Mandelbrot200-46            5.06ms ± 0%    5.07ms ± 0%    ~     (p=0.548 n=5+5)
GoParse-46                  5.04ms ± 0%    5.07ms ± 0%  +0.65%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-46       117ns ± 0%     112ns ± 4%  -4.27%  (p=0.016 n=4+5)
RegexpMatchEasy0_1K-46       332ns ± 0%     330ns ± 1%    ~     (p=0.095 n=5+5)
RegexpMatchEasy1_32-46       104ns ± 0%     110ns ± 1%  +5.29%  (p=0.029 n=4+4)
RegexpMatchEasy1_1K-46       563ns ± 0%     567ns ± 2%    ~     (p=0.151 n=5+5)
RegexpMatchMedium_32-46      167ns ± 2%     166ns ± 0%    ~     (p=0.333 n=5+4)
RegexpMatchMedium_1K-46     49.5µs ± 0%    49.6µs ± 0%    ~     (p=0.841 n=5+5)
RegexpMatchHard_32-46       2.56µs ± 1%    2.49µs ± 0%  -2.81%  (p=0.008 n=5+5)
RegexpMatchHard_1K-46       77.0µs ± 0%    75.8µs ± 0%  -1.55%  (p=0.008 n=5+5)
Revcomp-46                   631ms ± 1%     628ms ± 0%    ~     (p=0.095 n=5+5)
Template-46                 81.8ms ± 0%    84.3ms ± 1%  +3.05%  (p=0.008 n=5+5)
TimeParse-46                 423ns ± 0%     425ns ± 0%  +0.52%  (p=0.008 n=5+5)
TimeFormat-46                478ns ± 2%     478ns ± 1%    ~     (p=1.000 n=5+5)
[Geo mean]                  71.6µs         71.6µs       -0.01%

name                      old speed      new speed      delta
GobDecode-46              78.1MB/s ± 1%  78.5MB/s ± 1%    ~     (p=0.151 n=5+5)
GobEncode-46              94.3MB/s ± 0%  94.5MB/s ± 1%    ~     (p=0.690 n=5+5)
Gzip-46                   46.2MB/s ± 0%  46.2MB/s ± 0%    ~     (p=0.571 n=5+5)
Gunzip-46                  403MB/s ± 0%   404MB/s ± 0%  +0.33%  (p=0.032 n=5+5)
JSONEncode-46              114MB/s ± 0%   113MB/s ± 0%    ~     (p=0.056 n=5+5)
JSONDecode-46             22.0MB/s ± 0%  21.9MB/s ± 0%  -0.64%  (p=0.008 n=5+5)
GoParse-46                11.5MB/s ± 0%  11.4MB/s ± 0%  -0.64%  (p=0.008 n=5+5)
RegexpMatchEasy0_32-46     272MB/s ± 0%   285MB/s ± 4%  +4.74%  (p=0.016 n=4+5)
RegexpMatchEasy0_1K-46    3.08GB/s ± 0%  3.10GB/s ± 1%    ~     (p=0.151 n=5+5)
RegexpMatchEasy1_32-46     306MB/s ± 0%   290MB/s ± 1%  -5.21%  (p=0.029 n=4+4)
RegexpMatchEasy1_1K-46    1.82GB/s ± 0%  1.81GB/s ± 2%    ~     (p=0.151 n=5+5)
RegexpMatchMedium_32-46   5.99MB/s ± 0%  6.02MB/s ± 1%    ~     (p=0.063 n=4+5)
RegexpMatchMedium_1K-46   20.7MB/s ± 0%  20.7MB/s ± 0%    ~     (p=0.659 n=5+5)
RegexpMatchHard_32-46     12.5MB/s ± 1%  12.8MB/s ± 0%  +2.88%  (p=0.008 n=5+5)
RegexpMatchHard_1K-46     13.3MB/s ± 0%  13.5MB/s ± 0%  +1.58%  (p=0.008 n=5+5)
Revcomp-46                 402MB/s ± 1%   405MB/s ± 0%    ~     (p=0.095 n=5+5)
Template-46               23.7MB/s ± 0%  23.0MB/s ± 1%  -2.95%  (p=0.008 n=5+5)
[Geo mean]                82.2MB/s       82.3MB/s       +0.04%

Frame-pointer is enabled on Linux by default but can be disabled by setting: GOEXPERIMENT=noframepointer.

Fixes #10110

Change-Id: I1bfaca6dba29a63009d7c6ab04ed7a1413d9479e
Reviewed-on: https://go-review.googlesource.com/61511
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-08-29 18:28:34 +00:00
Ben Shi
3ca3e89bb6 cmd/compile: optimize arm64 with indexed FP load/store 
The FP load/store on arm64 have register indexed forms. And this
CL implements this optimization.

1. The total size of pkg/android_arm64 (excluding cmd/compile)
decreases about 400 bytes.

2. There is no regression in the go1 benchmark, the test case
GobEncode even gets slight improvement, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              19.0s ± 0%     19.0s ± 1%    ~     (p=0.817 n=29+29)
Fannkuch11-4                9.94s ± 0%     9.95s ± 0%  +0.03%  (p=0.010 n=24+30)
FmtFprintfEmpty-4           233ns ± 0%     233ns ± 0%    ~     (all equal)
FmtFprintfString-4          427ns ± 0%     427ns ± 0%    ~     (p=0.649 n=30+30)
FmtFprintfInt-4             471ns ± 0%     471ns ± 0%    ~     (all equal)
FmtFprintfIntInt-4          730ns ± 0%     730ns ± 0%    ~     (all equal)
FmtFprintfPrefixedInt-4     889ns ± 0%     889ns ± 0%    ~     (all equal)
FmtFprintfFloat-4          1.21µs ± 0%    1.21µs ± 0%  +0.04%  (p=0.012 n=20+30)
FmtManyArgs-4              2.99µs ± 0%    2.99µs ± 0%    ~     (p=0.651 n=29+29)
GobDecode-4                42.4ms ± 1%    42.3ms ± 1%  -0.27%  (p=0.001 n=29+28)
GobEncode-4                37.8ms ±11%    36.0ms ± 0%  -4.67%  (p=0.000 n=30+26)
Gzip-4                      1.98s ± 1%     1.96s ± 1%  -1.26%  (p=0.000 n=30+30)
Gunzip-4                    175ms ± 0%     175ms ± 0%    ~     (p=0.988 n=29+29)
HTTPClientServer-4          854µs ± 5%     860µs ± 5%    ~     (p=0.236 n=28+29)
JSONEncode-4               88.8ms ± 0%    87.9ms ± 0%  -1.00%  (p=0.000 n=24+26)
JSONDecode-4                390ms ± 1%     392ms ± 2%  +0.48%  (p=0.025 n=30+30)
Mandelbrot200-4            19.5ms ± 0%    19.5ms ± 0%    ~     (p=0.894 n=24+29)
GoParse-4                  20.3ms ± 0%    20.1ms ± 1%  -0.94%  (p=0.000 n=27+26)
RegexpMatchEasy0_32-4       451ns ± 0%     451ns ± 0%    ~     (p=0.578 n=30+30)
RegexpMatchEasy0_1K-4      1.63µs ± 0%    1.63µs ± 0%    ~     (p=0.298 n=30+28)
RegexpMatchEasy1_32-4       431ns ± 0%     434ns ± 0%  +0.67%  (p=0.000 n=30+29)
RegexpMatchEasy1_1K-4      2.60µs ± 0%    2.64µs ± 0%  +1.36%  (p=0.000 n=28+26)
RegexpMatchMedium_32-4      744ns ± 0%     744ns ± 0%    ~     (p=0.474 n=29+29)
RegexpMatchMedium_1K-4      223µs ± 0%     223µs ± 0%  -0.08%  (p=0.038 n=26+30)
RegexpMatchHard_32-4       12.2µs ± 0%    12.3µs ± 0%  +0.27%  (p=0.000 n=29+30)
RegexpMatchHard_1K-4        373µs ± 0%     373µs ± 0%    ~     (p=0.219 n=29+28)
Revcomp-4                   2.84s ± 0%     2.84s ± 0%    ~     (p=0.130 n=28+28)
Template-4                  394ms ± 1%     392ms ± 1%  -0.52%  (p=0.001 n=30+30)
TimeParse-4                1.93µs ± 0%    1.93µs ± 0%    ~     (p=0.587 n=29+30)
TimeFormat-4               2.00µs ± 0%    2.00µs ± 0%  +0.07%  (p=0.001 n=28+27)
[Geo mean]                  306µs          305µs       -0.17%

name                     old speed      new speed      delta
GobDecode-4              18.1MB/s ± 1%  18.2MB/s ± 1%  +0.27%  (p=0.001 n=29+28)
GobEncode-4              20.3MB/s ±10%  21.3MB/s ± 0%  +4.64%  (p=0.000 n=30+26)
Gzip-4                   9.79MB/s ± 1%  9.91MB/s ± 1%  +1.28%  (p=0.000 n=30+30)
Gunzip-4                  111MB/s ± 0%   111MB/s ± 0%    ~     (p=0.988 n=29+29)
JSONEncode-4             21.8MB/s ± 0%  22.1MB/s ± 0%  +1.02%  (p=0.000 n=24+26)
JSONDecode-4             4.97MB/s ± 1%  4.95MB/s ± 2%  -0.45%  (p=0.031 n=30+30)
GoParse-4                2.85MB/s ± 1%  2.88MB/s ± 1%  +1.03%  (p=0.000 n=30+26)
RegexpMatchEasy0_32-4    70.9MB/s ± 0%  70.9MB/s ± 0%    ~     (p=0.904 n=29+28)
RegexpMatchEasy0_1K-4     627MB/s ± 0%   627MB/s ± 0%    ~     (p=0.156 n=30+30)
RegexpMatchEasy1_32-4    74.2MB/s ± 0%  73.7MB/s ± 0%  -0.67%  (p=0.000 n=30+29)
RegexpMatchEasy1_1K-4     393MB/s ± 0%   388MB/s ± 0%  -1.34%  (p=0.000 n=28+26)
RegexpMatchMedium_32-4   1.34MB/s ± 0%  1.34MB/s ± 0%    ~     (all equal)
RegexpMatchMedium_1K-4   4.59MB/s ± 0%  4.59MB/s ± 0%  +0.07%  (p=0.035 n=25+30)
RegexpMatchHard_32-4     2.61MB/s ± 0%  2.61MB/s ± 0%  -0.11%  (p=0.002 n=28+30)
RegexpMatchHard_1K-4     2.75MB/s ± 0%  2.75MB/s ± 0%  +0.15%  (p=0.001 n=30+24)
Revcomp-4                89.4MB/s ± 0%  89.4MB/s ± 0%    ~     (p=0.140 n=28+28)
Template-4               4.93MB/s ± 1%  4.95MB/s ± 1%  +0.51%  (p=0.001 n=30+30)
[Geo mean]               18.4MB/s       18.4MB/s       +0.37%

Change-Id: I9a6b521a971b21cfb51064e8e9b853cef8a1d071
Reviewed-on: https://go-review.googlesource.com/124636
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-08-28 02:37:18 +00:00
Ben Shi
2b69ad0b3c cmd/compile: optimize arm's comparison 
The CMP/CMN/TST/TEQ perform similar to SUB/ADD/AND/XOR except
the result is abondoned, and only NZCV flags are affected.

This CL implements further optimization with them.

1. A micro benchmark test gets more than 9% improvment.
TSTTEQ-4                   6.99ms ± 0%    6.35ms ± 0%  -9.15%  (p=0.000 n=33+36)
(https://github.com/benshi001/ugo1/blob/master/tstteq2_test.go)

2. The go1 benckmark shows no regression, excluding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              25.7s ± 1%     25.7s ± 1%    ~     (p=0.830 n=40+40)
Fannkuch11-4                13.3s ± 0%     13.2s ± 0%  -0.65%  (p=0.000 n=40+34)
FmtFprintfEmpty-4           394ns ± 0%     394ns ± 0%    ~     (p=0.819 n=40+40)
FmtFprintfString-4          677ns ± 0%     677ns ± 0%  +0.06%  (p=0.039 n=39+40)
FmtFprintfInt-4             707ns ± 0%     706ns ± 0%  -0.14%  (p=0.000 n=40+39)
FmtFprintfIntInt-4         1.04µs ± 0%    1.04µs ± 0%  +0.10%  (p=0.000 n=29+31)
FmtFprintfPrefixedInt-4    1.10µs ± 0%    1.11µs ± 0%  +0.65%  (p=0.000 n=39+37)
FmtFprintfFloat-4          2.27µs ± 0%    2.26µs ± 0%  -0.53%  (p=0.000 n=39+40)
FmtManyArgs-4              3.96µs ± 0%    3.96µs ± 0%  +0.10%  (p=0.000 n=39+40)
GobDecode-4                53.4ms ± 1%    52.8ms ± 2%  -1.10%  (p=0.000 n=39+39)
GobEncode-4                50.3ms ± 3%    50.4ms ± 2%    ~     (p=0.089 n=40+39)
Gzip-4                      2.62s ± 0%     2.64s ± 0%  +0.60%  (p=0.000 n=40+39)
Gunzip-4                    312ms ± 0%     312ms ± 0%  +0.02%  (p=0.030 n=40+39)
HTTPClientServer-4         1.01ms ± 7%    0.98ms ± 7%  -2.37%  (p=0.000 n=40+39)
JSONEncode-4                126ms ± 1%     126ms ± 1%  -0.38%  (p=0.004 n=39+39)
JSONDecode-4                423ms ± 0%     426ms ± 2%  +0.72%  (p=0.001 n=39+40)
Mandelbrot200-4            18.4ms ± 0%    18.4ms ± 0%  +0.04%  (p=0.000 n=38+40)
GoParse-4                  22.8ms ± 0%    22.6ms ± 0%  -0.68%  (p=0.000 n=35+40)
RegexpMatchEasy0_32-4       699ns ± 0%     704ns ± 0%  +0.73%  (p=0.000 n=27+40)
RegexpMatchEasy0_1K-4      4.27µs ± 0%    4.26µs ± 0%  -0.09%  (p=0.000 n=35+38)
RegexpMatchEasy1_32-4       741ns ± 0%     735ns ± 0%  -0.85%  (p=0.000 n=40+35)
RegexpMatchEasy1_1K-4      5.53µs ± 0%    5.49µs ± 0%  -0.69%  (p=0.000 n=39+40)
RegexpMatchMedium_32-4     1.07µs ± 0%    1.04µs ± 2%  -2.34%  (p=0.000 n=40+40)
RegexpMatchMedium_1K-4      261µs ± 0%     261µs ± 0%  -0.16%  (p=0.000 n=40+39)
RegexpMatchHard_32-4       14.9µs ± 0%    14.9µs ± 0%  -0.18%  (p=0.000 n=39+40)
RegexpMatchHard_1K-4        445µs ± 0%     446µs ± 0%  +0.09%  (p=0.000 n=36+34)
Revcomp-4                  41.8ms ± 1%    41.8ms ± 1%    ~     (p=0.595 n=39+38)
Template-4                  530ms ± 1%     528ms ± 1%  -0.49%  (p=0.000 n=40+40)
TimeParse-4                3.39µs ± 0%    3.42µs ± 0%  +0.98%  (p=0.000 n=36+38)
TimeFormat-4               6.12µs ± 0%    6.07µs ± 0%  -0.81%  (p=0.000 n=34+38)
[Geo mean]                  384µs          383µs       -0.24%

name                     old speed      new speed      delta
GobDecode-4              14.4MB/s ± 1%  14.5MB/s ± 2%  +1.11%  (p=0.000 n=39+39)
GobEncode-4              15.3MB/s ± 3%  15.2MB/s ± 2%    ~     (p=0.104 n=40+39)
Gzip-4                   7.40MB/s ± 1%  7.36MB/s ± 0%  -0.60%  (p=0.000 n=40+39)
Gunzip-4                 62.2MB/s ± 0%  62.1MB/s ± 0%  -0.02%  (p=0.047 n=40+39)
JSONEncode-4             15.4MB/s ± 1%  15.4MB/s ± 2%  +0.39%  (p=0.002 n=39+39)
JSONDecode-4             4.59MB/s ± 0%  4.56MB/s ± 2%  -0.71%  (p=0.000 n=39+40)
GoParse-4                2.54MB/s ± 0%  2.56MB/s ± 0%  +0.72%  (p=0.000 n=26+40)
RegexpMatchEasy0_32-4    45.8MB/s ± 0%  45.4MB/s ± 0%  -0.75%  (p=0.000 n=38+40)
RegexpMatchEasy0_1K-4     240MB/s ± 0%   240MB/s ± 0%  +0.09%  (p=0.000 n=35+38)
RegexpMatchEasy1_32-4    43.1MB/s ± 0%  43.5MB/s ± 0%  +0.84%  (p=0.000 n=40+39)
RegexpMatchEasy1_1K-4     185MB/s ± 0%   186MB/s ± 0%  +0.69%  (p=0.000 n=39+40)
RegexpMatchMedium_32-4    936kB/s ± 1%   959kB/s ± 2%  +2.38%  (p=0.000 n=40+40)
RegexpMatchMedium_1K-4   3.92MB/s ± 0%  3.93MB/s ± 0%  +0.18%  (p=0.000 n=39+40)
RegexpMatchHard_32-4     2.15MB/s ± 0%  2.15MB/s ± 0%  +0.19%  (p=0.000 n=40+40)
RegexpMatchHard_1K-4     2.30MB/s ± 0%  2.30MB/s ± 0%    ~     (all equal)
Revcomp-4                60.8MB/s ± 1%  60.8MB/s ± 1%    ~     (p=0.600 n=39+38)
Template-4               3.66MB/s ± 1%  3.68MB/s ± 1%  +0.46%  (p=0.000 n=40+40)
[Geo mean]               12.8MB/s       12.8MB/s       +0.27%

Change-Id: I849161169ecf0876a04b7c1d3990fa8d1435215e
Reviewed-on: https://go-review.googlesource.com/122855
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-08-27 15:49:46 +00:00
Ben Shi
e03220a594 cmd/compile: optimize 386 code with FLDPI 
FLDPI pushes the constant pi to 387's register stack, which is
more efficient than MOVSSconst/MOVSDconst.

1. This optimization reduces 0.3KB of the total size of pkg/linux_386
(exlcuding cmd/compile).

2. There is little regression in the go1 benchmark.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.30s ± 3%     3.30s ± 2%    ~     (p=0.759 n=40+39)
Fannkuch11-4                3.53s ± 1%     3.54s ± 1%    ~     (p=0.168 n=40+40)
FmtFprintfEmpty-4          45.5ns ± 3%    45.6ns ± 3%    ~     (p=0.553 n=40+40)
FmtFprintfString-4         78.4ns ± 3%    78.3ns ± 3%    ~     (p=0.593 n=40+40)
FmtFprintfInt-4            88.8ns ± 2%    89.9ns ± 2%    ~     (p=0.083 n=40+33)
FmtFprintfIntInt-4          140ns ± 4%     140ns ± 4%    ~     (p=0.656 n=40+40)
FmtFprintfPrefixedInt-4     180ns ± 2%     181ns ± 3%  +0.53%  (p=0.050 n=40+40)
FmtFprintfFloat-4           408ns ± 4%     411ns ± 3%    ~     (p=0.112 n=40+40)
FmtManyArgs-4               599ns ± 3%     602ns ± 3%    ~     (p=0.784 n=40+40)
GobDecode-4                7.24ms ± 6%    7.30ms ± 5%    ~     (p=0.171 n=40+40)
GobEncode-4                6.98ms ± 5%    6.89ms ± 8%    ~     (p=0.107 n=40+40)
Gzip-4                      396ms ± 4%     396ms ± 3%    ~     (p=0.852 n=40+40)
Gunzip-4                   41.3ms ± 3%    41.5ms ± 4%    ~     (p=0.221 n=40+40)
HTTPClientServer-4         63.4µs ± 3%    63.4µs ± 2%    ~     (p=0.895 n=39+40)
JSONEncode-4               17.5ms ± 2%    17.5ms ± 3%    ~     (p=0.090 n=40+40)
JSONDecode-4               60.6ms ± 3%    60.1ms ± 4%    ~     (p=0.184 n=40+40)
Mandelbrot200-4            7.80ms ± 3%    7.78ms ± 2%    ~     (p=0.512 n=40+40)
GoParse-4                  3.30ms ± 3%    3.28ms ± 2%  -0.61%  (p=0.034 n=40+40)
RegexpMatchEasy0_32-4       104ns ± 4%     103ns ± 4%    ~     (p=0.118 n=40+40)
RegexpMatchEasy0_1K-4       850ns ± 2%     848ns ± 2%    ~     (p=0.370 n=40+40)
RegexpMatchEasy1_32-4       112ns ± 4%     112ns ± 4%    ~     (p=0.848 n=40+40)
RegexpMatchEasy1_1K-4      1.04µs ± 4%    1.03µs ± 4%    ~     (p=0.333 n=40+40)
RegexpMatchMedium_32-4      132ns ± 4%     131ns ± 3%    ~     (p=0.527 n=40+40)
RegexpMatchMedium_1K-4     43.4µs ± 3%    43.5µs ± 3%    ~     (p=0.111 n=40+40)
RegexpMatchHard_32-4       2.24µs ± 4%    2.24µs ± 4%    ~     (p=0.441 n=40+40)
RegexpMatchHard_1K-4       67.9µs ± 3%    68.0µs ± 3%    ~     (p=0.095 n=40+40)
Revcomp-4                   1.84s ± 2%     1.84s ± 2%    ~     (p=0.677 n=40+40)
Template-4                 68.4ms ± 3%    68.6ms ± 3%    ~     (p=0.345 n=40+40)
TimeParse-4                 433ns ± 3%     433ns ± 3%    ~     (p=0.403 n=40+40)
TimeFormat-4                407ns ± 3%     406ns ± 3%    ~     (p=0.900 n=40+40)
[Geo mean]                 67.1µs         67.2µs       +0.04%

name                     old speed      new speed      delta
GobDecode-4               106MB/s ± 5%   105MB/s ± 5%    ~     (p=0.173 n=40+40)
GobEncode-4               110MB/s ± 5%   112MB/s ± 9%    ~     (p=0.104 n=40+40)
Gzip-4                   49.0MB/s ± 4%  49.1MB/s ± 4%    ~     (p=0.836 n=40+40)
Gunzip-4                  471MB/s ± 3%   468MB/s ± 4%    ~     (p=0.218 n=40+40)
JSONEncode-4              111MB/s ± 2%   111MB/s ± 3%    ~     (p=0.090 n=40+40)
JSONDecode-4             32.0MB/s ± 3%  32.3MB/s ± 4%    ~     (p=0.194 n=40+40)
GoParse-4                17.6MB/s ± 3%  17.7MB/s ± 2%  +0.62%  (p=0.035 n=40+40)
RegexpMatchEasy0_32-4     307MB/s ± 4%   309MB/s ± 4%  +0.70%  (p=0.041 n=40+40)
RegexpMatchEasy0_1K-4    1.20GB/s ± 3%  1.21GB/s ± 2%    ~     (p=0.353 n=40+40)
RegexpMatchEasy1_32-4     285MB/s ± 3%   284MB/s ± 4%    ~     (p=0.384 n=40+40)
RegexpMatchEasy1_1K-4     988MB/s ± 4%   992MB/s ± 3%    ~     (p=0.335 n=40+40)
RegexpMatchMedium_32-4   7.56MB/s ± 4%  7.57MB/s ± 4%    ~     (p=0.314 n=40+40)
RegexpMatchMedium_1K-4   23.6MB/s ± 3%  23.6MB/s ± 3%    ~     (p=0.107 n=40+40)
RegexpMatchHard_32-4     14.3MB/s ± 4%  14.3MB/s ± 4%    ~     (p=0.429 n=40+40)
RegexpMatchHard_1K-4     15.1MB/s ± 3%  15.1MB/s ± 3%    ~     (p=0.099 n=40+40)
Revcomp-4                 138MB/s ± 2%   138MB/s ± 2%    ~     (p=0.658 n=40+40)
Template-4               28.4MB/s ± 3%  28.3MB/s ± 3%    ~     (p=0.331 n=40+40)
[Geo mean]               80.8MB/s       80.8MB/s       +0.09%

Change-Id: I0cb715eead68ade097a302e7fb80ccbd1d1b511e
Reviewed-on: https://go-review.googlesource.com/130975
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-25 02:39:49 +00:00
Ben Shi
3bc34385fa cmd/compile: introduce more read-modify-write operations for amd64 
Add suport of read-modify-write for AND/SUB/AND/OR/XOR on amd64.

1. The total size of pkg/linux_amd64 decreases about 4KB, excluding
cmd/compile.

2. The go1 benchmark shows a little improvement, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              2.63s ± 3%     2.65s ± 4%   +1.01%  (p=0.037 n=35+35)
Fannkuch11-4                2.33s ± 2%     2.39s ± 2%   +2.49%  (p=0.000 n=35+35)
FmtFprintfEmpty-4          45.4ns ± 5%    40.8ns ± 6%  -10.09%  (p=0.000 n=35+35)
FmtFprintfString-4         73.3ns ± 4%    70.9ns ± 3%   -3.23%  (p=0.000 n=30+35)
FmtFprintfInt-4            79.9ns ± 4%    79.5ns ± 3%     ~     (p=0.736 n=34+35)
FmtFprintfIntInt-4          126ns ± 4%     125ns ± 4%     ~     (p=0.083 n=35+35)
FmtFprintfPrefixedInt-4     152ns ± 6%     152ns ± 3%     ~     (p=0.855 n=34+35)
FmtFprintfFloat-4           215ns ± 4%     213ns ± 4%     ~     (p=0.066 n=35+35)
FmtManyArgs-4               522ns ± 3%     506ns ± 3%   -3.15%  (p=0.000 n=35+35)
GobDecode-4                6.45ms ± 8%    6.51ms ± 7%   +0.96%  (p=0.026 n=35+35)
GobEncode-4                6.10ms ± 6%    6.02ms ± 8%     ~     (p=0.160 n=35+35)
Gzip-4                      228ms ± 3%     221ms ± 3%   -2.92%  (p=0.000 n=35+35)
Gunzip-4                   37.5ms ± 4%    37.2ms ± 3%   -0.78%  (p=0.036 n=35+35)
HTTPClientServer-4         58.7µs ± 2%    59.2µs ± 1%   +0.80%  (p=0.000 n=33+33)
JSONEncode-4               12.0ms ± 3%    12.2ms ± 3%   +1.84%  (p=0.008 n=35+35)
JSONDecode-4               57.0ms ± 4%    56.6ms ± 3%     ~     (p=0.320 n=35+35)
Mandelbrot200-4            3.82ms ± 3%    3.79ms ± 3%     ~     (p=0.074 n=35+35)
GoParse-4                  3.21ms ± 5%    3.24ms ± 4%     ~     (p=0.119 n=35+35)
RegexpMatchEasy0_32-4      76.3ns ± 4%    75.4ns ± 4%   -1.14%  (p=0.014 n=34+33)
RegexpMatchEasy0_1K-4       251ns ± 4%     254ns ± 3%   +1.28%  (p=0.016 n=35+35)
RegexpMatchEasy1_32-4      69.6ns ± 3%    70.1ns ± 3%   +0.82%  (p=0.005 n=35+35)
RegexpMatchEasy1_1K-4       367ns ± 4%     376ns ± 4%   +2.47%  (p=0.000 n=35+35)
RegexpMatchMedium_32-4      108ns ± 5%     104ns ± 4%   -3.18%  (p=0.000 n=35+35)
RegexpMatchMedium_1K-4     33.8µs ± 3%    32.7µs ± 3%   -3.27%  (p=0.000 n=35+35)
RegexpMatchHard_32-4       1.55µs ± 3%    1.52µs ± 3%   -1.64%  (p=0.000 n=35+35)
RegexpMatchHard_1K-4       46.6µs ± 3%    46.6µs ± 4%     ~     (p=0.149 n=35+35)
Revcomp-4                   416ms ± 7%     412ms ± 6%   -0.95%  (p=0.033 n=33+35)
Template-4                 64.3ms ± 3%    62.4ms ± 7%   -2.94%  (p=0.000 n=35+35)
TimeParse-4                 320ns ± 2%     322ns ± 3%     ~     (p=0.589 n=35+35)
TimeFormat-4                300ns ± 3%     300ns ± 3%     ~     (p=0.597 n=35+35)
[Geo mean]                 47.4µs         47.0µs        -0.86%

name                     old speed      new speed      delta
GobDecode-4               119MB/s ± 7%   118MB/s ± 7%   -0.96%  (p=0.027 n=35+35)
GobEncode-4               126MB/s ± 7%   127MB/s ± 6%     ~     (p=0.157 n=34+34)
Gzip-4                   85.3MB/s ± 3%  87.9MB/s ± 3%   +3.02%  (p=0.000 n=35+35)
Gunzip-4                  518MB/s ± 4%   522MB/s ± 3%   +0.79%  (p=0.037 n=35+35)
JSONEncode-4              162MB/s ± 3%   159MB/s ± 3%   -1.81%  (p=0.009 n=35+35)
JSONDecode-4             34.1MB/s ± 4%  34.3MB/s ± 3%     ~     (p=0.318 n=35+35)
GoParse-4                18.0MB/s ± 5%  17.9MB/s ± 4%     ~     (p=0.117 n=35+35)
RegexpMatchEasy0_32-4     419MB/s ± 3%   425MB/s ± 4%   +1.46%  (p=0.003 n=32+33)
RegexpMatchEasy0_1K-4    4.07GB/s ± 4%  4.02GB/s ± 3%   -1.28%  (p=0.014 n=35+35)
RegexpMatchEasy1_32-4     460MB/s ± 3%   456MB/s ± 4%   -0.82%  (p=0.004 n=35+35)
RegexpMatchEasy1_1K-4    2.79GB/s ± 4%  2.72GB/s ± 4%   -2.39%  (p=0.000 n=35+35)
RegexpMatchMedium_32-4   9.23MB/s ± 4%  9.53MB/s ± 4%   +3.16%  (p=0.000 n=35+35)
RegexpMatchMedium_1K-4   30.3MB/s ± 3%  31.3MB/s ± 3%   +3.38%  (p=0.000 n=35+35)
RegexpMatchHard_32-4     20.7MB/s ± 3%  21.0MB/s ± 3%   +1.67%  (p=0.000 n=35+35)
RegexpMatchHard_1K-4     22.0MB/s ± 3%  21.9MB/s ± 4%     ~     (p=0.277 n=35+33)
Revcomp-4                 612MB/s ± 7%   618MB/s ± 6%   +0.96%  (p=0.034 n=33+35)
Template-4               30.2MB/s ± 3%  31.1MB/s ± 6%   +3.05%  (p=0.000 n=35+35)
[Geo mean]                123MB/s        124MB/s        +0.64%

Change-Id: Ia025da272e07d0069413824bfff3471b106d6280
Reviewed-on: https://go-review.googlesource.com/121535
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-24 23:38:25 +00:00
Ben Shi
a0a7e9fc0c cmd/compile: implement "OPC $imm, (mem)" for 386 
New read-modify-write operations are introduced in this CL for 386.

1. The total size of pkg/linux_386 decreases about 10KB (excluding
cmd/compile).

2. The go1 benchmark shows little regression.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.32s ± 4%     3.29s ± 2%    ~     (p=0.059 n=30+30)
Fannkuch11-4                3.49s ± 1%     3.46s ± 1%  -0.92%  (p=0.001 n=30+30)
FmtFprintfEmpty-4          47.7ns ± 2%    46.8ns ± 5%  -1.93%  (p=0.011 n=25+30)
FmtFprintfString-4         79.5ns ± 7%    80.2ns ± 3%  +0.89%  (p=0.001 n=28+29)
FmtFprintfInt-4            90.5ns ± 2%    92.1ns ± 2%  +1.82%  (p=0.014 n=22+30)
FmtFprintfIntInt-4          141ns ± 1%     144ns ± 3%  +2.23%  (p=0.013 n=22+30)
FmtFprintfPrefixedInt-4     183ns ± 2%     184ns ± 3%    ~     (p=0.080 n=21+30)
FmtFprintfFloat-4           409ns ± 3%     412ns ± 3%  +0.83%  (p=0.040 n=30+30)
FmtManyArgs-4               597ns ± 6%     607ns ± 4%  +1.71%  (p=0.006 n=30+30)
GobDecode-4                7.21ms ± 5%    7.18ms ± 6%    ~     (p=0.665 n=30+30)
GobEncode-4                7.17ms ± 6%    7.09ms ± 7%    ~     (p=0.117 n=29+30)
Gzip-4                      413ms ± 4%     399ms ± 4%  -3.48%  (p=0.000 n=30+30)
Gunzip-4                   41.3ms ± 4%    41.7ms ± 3%  +1.05%  (p=0.011 n=30+30)
HTTPClientServer-4         63.5µs ± 3%    62.9µs ± 2%  -0.97%  (p=0.017 n=30+27)
JSONEncode-4               20.3ms ± 5%    20.1ms ± 5%  -1.16%  (p=0.004 n=30+30)
JSONDecode-4               66.2ms ± 4%    67.7ms ± 4%  +2.21%  (p=0.000 n=30+30)
Mandelbrot200-4            5.16ms ± 3%    5.18ms ± 3%    ~     (p=0.123 n=30+30)
GoParse-4                  3.23ms ± 2%    3.27ms ± 2%  +1.08%  (p=0.006 n=30+30)
RegexpMatchEasy0_32-4      98.9ns ± 5%    97.1ns ± 4%  -1.83%  (p=0.006 n=30+30)
RegexpMatchEasy0_1K-4       842ns ± 3%     842ns ± 3%    ~     (p=0.550 n=30+30)
RegexpMatchEasy1_32-4       107ns ± 4%     105ns ± 4%  -1.93%  (p=0.012 n=30+30)
RegexpMatchEasy1_1K-4      1.03µs ± 4%    1.04µs ± 4%    ~     (p=0.304 n=30+30)
RegexpMatchMedium_32-4      132ns ± 2%     129ns ± 4%  -2.02%  (p=0.000 n=21+30)
RegexpMatchMedium_1K-4     44.1µs ± 4%    43.8µs ± 3%    ~     (p=0.641 n=30+30)
RegexpMatchHard_32-4       2.26µs ± 4%    2.23µs ± 4%  -1.28%  (p=0.023 n=30+30)
RegexpMatchHard_1K-4       68.1µs ± 3%    68.6µs ± 4%    ~     (p=0.089 n=30+30)
Revcomp-4                   1.85s ± 2%     1.84s ± 2%    ~     (p=0.072 n=30+30)
Template-4                 69.2ms ± 3%    68.5ms ± 3%  -1.04%  (p=0.012 n=30+30)
TimeParse-4                 441ns ± 3%     446ns ± 4%  +1.21%  (p=0.001 n=30+30)
TimeFormat-4                415ns ± 3%     415ns ± 3%    ~     (p=0.436 n=30+30)
[Geo mean]                 67.0µs         66.9µs       -0.17%

name                     old speed      new speed      delta
GobDecode-4               107MB/s ± 5%   107MB/s ± 6%    ~     (p=0.663 n=30+30)
GobEncode-4               107MB/s ± 6%   108MB/s ± 7%    ~     (p=0.117 n=29+30)
Gzip-4                   47.0MB/s ± 4%  48.7MB/s ± 4%  +3.61%  (p=0.000 n=30+30)
Gunzip-4                  470MB/s ± 4%   466MB/s ± 4%  -1.05%  (p=0.011 n=30+30)
JSONEncode-4             95.6MB/s ± 5%  96.7MB/s ± 5%  +1.16%  (p=0.005 n=30+30)
JSONDecode-4             29.3MB/s ± 4%  28.7MB/s ± 4%  -2.17%  (p=0.000 n=30+30)
GoParse-4                17.9MB/s ± 2%  17.7MB/s ± 2%  -1.06%  (p=0.007 n=30+30)
RegexpMatchEasy0_32-4     323MB/s ± 5%   329MB/s ± 4%  +1.93%  (p=0.006 n=30+30)
RegexpMatchEasy0_1K-4    1.22GB/s ± 3%  1.22GB/s ± 3%    ~     (p=0.496 n=30+30)
RegexpMatchEasy1_32-4     298MB/s ± 4%   303MB/s ± 4%  +1.84%  (p=0.017 n=30+30)
RegexpMatchEasy1_1K-4     995MB/s ± 4%   989MB/s ± 4%    ~     (p=0.307 n=30+30)
RegexpMatchMedium_32-4   7.56MB/s ± 4%  7.74MB/s ± 4%  +2.46%  (p=0.000 n=22+30)
RegexpMatchMedium_1K-4   23.2MB/s ± 4%  23.4MB/s ± 3%    ~     (p=0.651 n=30+30)
RegexpMatchHard_32-4     14.2MB/s ± 4%  14.3MB/s ± 4%  +1.29%  (p=0.021 n=30+30)
RegexpMatchHard_1K-4     15.0MB/s ± 3%  14.9MB/s ± 4%    ~     (p=0.069 n=30+29)
Revcomp-4                 138MB/s ± 2%   138MB/s ± 2%    ~     (p=0.072 n=30+30)
Template-4               28.1MB/s ± 3%  28.4MB/s ± 3%  +1.05%  (p=0.012 n=30+30)
[Geo mean]               79.7MB/s       80.2MB/s       +0.60%

Change-Id: I44a1dfc942c9a385904553c4fe1fa8e509c8aa31
Reviewed-on: https://go-review.googlesource.com/120916
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-22 04:12:42 +00:00
Ben Shi
90f2fa0037 cmd/compile: optimize 386 code with MULLload/DIVSSload/DIVSDload 
IMULL/DIVSS/DIVSD all can take the source operand from memory
directly. And this CL implement that optimization.

1. The total size of pkg/linux_386 decreases about 84KB (excluding
cmd/compile).

2. The go1 benchmark shows little regression in total (excluding noise).
name                     old time/op    new time/op    delta
BinaryTree17-4              3.29s ± 2%     3.27s ± 4%    ~     (p=0.192 n=30+30)
Fannkuch11-4                3.49s ± 2%     3.54s ± 1%  +1.48%  (p=0.000 n=30+30)
FmtFprintfEmpty-4          45.9ns ± 3%    46.3ns ± 4%  +0.89%  (p=0.037 n=30+30)
FmtFprintfString-4         78.8ns ± 3%    78.7ns ± 4%    ~     (p=0.209 n=30+27)
FmtFprintfInt-4            91.0ns ± 2%    90.3ns ± 2%  -0.82%  (p=0.031 n=30+27)
FmtFprintfIntInt-4          142ns ± 4%     143ns ± 4%    ~     (p=0.136 n=30+30)
FmtFprintfPrefixedInt-4     181ns ± 3%     183ns ± 4%  +1.40%  (p=0.005 n=30+30)
FmtFprintfFloat-4           404ns ± 4%     408ns ± 3%    ~     (p=0.397 n=30+30)
FmtManyArgs-4               601ns ± 3%     609ns ± 5%    ~     (p=0.059 n=30+30)
GobDecode-4                7.21ms ± 5%    7.24ms ± 5%    ~     (p=0.612 n=30+30)
GobEncode-4                6.91ms ± 6%    6.91ms ± 6%    ~     (p=0.797 n=30+30)
Gzip-4                      398ms ± 6%     399ms ± 4%    ~     (p=0.173 n=30+30)
Gunzip-4                   41.7ms ± 3%    41.8ms ± 3%    ~     (p=0.423 n=30+30)
HTTPClientServer-4         62.3µs ± 2%    62.7µs ± 3%    ~     (p=0.085 n=29+30)
JSONEncode-4               21.0ms ± 4%    20.7ms ± 5%  -1.39%  (p=0.014 n=30+30)
JSONDecode-4               66.3ms ± 3%    67.4ms ± 1%  +1.71%  (p=0.003 n=30+24)
Mandelbrot200-4            5.15ms ± 3%    5.16ms ± 3%    ~     (p=0.697 n=30+30)
GoParse-4                  3.24ms ± 3%    3.27ms ± 4%  +0.91%  (p=0.032 n=30+30)
RegexpMatchEasy0_32-4       101ns ± 5%      99ns ± 4%  -1.82%  (p=0.008 n=29+30)
RegexpMatchEasy0_1K-4       848ns ± 4%     841ns ± 2%  -0.77%  (p=0.043 n=30+30)
RegexpMatchEasy1_32-4       106ns ± 6%     106ns ± 3%    ~     (p=0.939 n=29+30)
RegexpMatchEasy1_1K-4      1.02µs ± 3%    1.03µs ± 4%    ~     (p=0.297 n=28+30)
RegexpMatchMedium_32-4      129ns ± 4%     127ns ± 4%    ~     (p=0.073 n=30+30)
RegexpMatchMedium_1K-4     43.9µs ± 3%    43.8µs ± 3%    ~     (p=0.186 n=30+30)
RegexpMatchHard_32-4       2.24µs ± 4%    2.22µs ± 4%    ~     (p=0.332 n=30+29)
RegexpMatchHard_1K-4       68.0µs ± 4%    67.5µs ± 3%    ~     (p=0.290 n=30+30)
Revcomp-4                   1.85s ± 3%     1.85s ± 3%    ~     (p=0.358 n=30+30)
Template-4                 69.6ms ± 3%    70.0ms ± 4%    ~     (p=0.273 n=30+30)
TimeParse-4                 445ns ± 3%     441ns ± 3%    ~     (p=0.494 n=30+30)
TimeFormat-4                412ns ± 3%     412ns ± 6%    ~     (p=0.841 n=30+30)
[Geo mean]                 66.7µs         66.8µs       +0.13%

name                     old speed      new speed      delta
GobDecode-4               107MB/s ± 5%   106MB/s ± 5%    ~     (p=0.615 n=30+30)
GobEncode-4               111MB/s ± 6%   111MB/s ± 6%    ~     (p=0.790 n=30+30)
Gzip-4                   48.8MB/s ± 6%  48.7MB/s ± 4%    ~     (p=0.167 n=30+30)
Gunzip-4                  465MB/s ± 3%   465MB/s ± 3%    ~     (p=0.420 n=30+30)
JSONEncode-4             92.4MB/s ± 4%  93.7MB/s ± 5%  +1.42%  (p=0.015 n=30+30)
JSONDecode-4             29.3MB/s ± 3%  28.8MB/s ± 1%  -1.72%  (p=0.003 n=30+24)
GoParse-4                17.9MB/s ± 3%  17.7MB/s ± 4%  -0.89%  (p=0.037 n=30+30)
RegexpMatchEasy0_32-4     317MB/s ± 8%   324MB/s ± 4%  +2.14%  (p=0.006 n=30+30)
RegexpMatchEasy0_1K-4    1.21GB/s ± 4%  1.22GB/s ± 2%  +0.77%  (p=0.036 n=30+30)
RegexpMatchEasy1_32-4     298MB/s ± 7%   299MB/s ± 4%    ~     (p=0.511 n=30+30)
RegexpMatchEasy1_1K-4    1.00GB/s ± 3%  1.00GB/s ± 4%    ~     (p=0.304 n=28+30)
RegexpMatchMedium_32-4   7.75MB/s ± 4%  7.82MB/s ± 4%    ~     (p=0.089 n=30+30)
RegexpMatchMedium_1K-4   23.3MB/s ± 3%  23.4MB/s ± 3%    ~     (p=0.181 n=30+30)
RegexpMatchHard_32-4     14.3MB/s ± 4%  14.4MB/s ± 4%    ~     (p=0.320 n=30+29)
RegexpMatchHard_1K-4     15.1MB/s ± 4%  15.2MB/s ± 3%    ~     (p=0.273 n=30+30)
Revcomp-4                 137MB/s ± 3%   137MB/s ± 3%    ~     (p=0.352 n=30+30)
Template-4               27.9MB/s ± 3%  27.7MB/s ± 4%    ~     (p=0.277 n=30+30)
[Geo mean]               79.9MB/s       80.1MB/s       +0.15%

Change-Id: I97333cd8ddabb3c7c88ca5aa9e14a005b74d306d
Reviewed-on: https://go-review.googlesource.com/120695
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-22 03:38:38 +00:00
Ben Shi
705f3c74e6 cmd/compile: optimize AMD64 with DIVSSload and DIVSDload 
DIVSSload & DIVSDload directly operate on a memory operand. And
binary size can be reduced by them, while the performance is
not affected.

The total size of pkg/linux_amd64 (excluding cmd/compile) decreases
about 6KB.

There is little regression in the go1 benchmark test (excluding noise).
name                     old time/op    new time/op    delta
BinaryTree17-4              2.63s ± 4%     2.62s ± 4%    ~     (p=0.809 n=30+30)
Fannkuch11-4                2.40s ± 2%     2.40s ± 2%    ~     (p=0.109 n=30+30)
FmtFprintfEmpty-4          43.1ns ± 4%    43.2ns ± 9%    ~     (p=0.168 n=30+30)
FmtFprintfString-4         73.6ns ± 4%    74.1ns ± 4%    ~     (p=0.069 n=30+30)
FmtFprintfInt-4            81.0ns ± 3%    81.4ns ± 5%    ~     (p=0.350 n=30+30)
FmtFprintfIntInt-4          127ns ± 4%     129ns ± 4%  +0.99%  (p=0.021 n=30+30)
FmtFprintfPrefixedInt-4     156ns ± 4%     155ns ± 4%    ~     (p=0.415 n=30+30)
FmtFprintfFloat-4           219ns ± 4%     218ns ± 4%    ~     (p=0.071 n=30+30)
FmtManyArgs-4               522ns ± 3%     518ns ± 3%  -0.68%  (p=0.034 n=30+30)
GobDecode-4                6.49ms ± 6%    6.52ms ± 6%    ~     (p=0.832 n=30+30)
GobEncode-4                6.10ms ± 9%    6.14ms ± 7%    ~     (p=0.485 n=30+30)
Gzip-4                      227ms ± 1%     224ms ± 4%    ~     (p=0.484 n=24+30)
Gunzip-4                   37.2ms ± 3%    36.8ms ± 4%    ~     (p=0.889 n=30+30)
HTTPClientServer-4         58.9µs ± 1%    58.7µs ± 2%  -0.42%  (p=0.003 n=28+28)
JSONEncode-4               12.0ms ± 3%    12.0ms ± 4%    ~     (p=0.523 n=30+30)
JSONDecode-4               54.6ms ± 4%    54.5ms ± 4%    ~     (p=0.708 n=30+30)
Mandelbrot200-4            3.78ms ± 4%    3.81ms ± 3%  +0.99%  (p=0.016 n=30+30)
GoParse-4                  3.20ms ± 4%    3.20ms ± 5%    ~     (p=0.994 n=30+30)
RegexpMatchEasy0_32-4      77.0ns ± 4%    75.9ns ± 3%  -1.39%  (p=0.006 n=29+30)
RegexpMatchEasy0_1K-4       255ns ± 4%     253ns ± 4%    ~     (p=0.091 n=30+30)
RegexpMatchEasy1_32-4      69.7ns ± 3%    70.3ns ± 4%    ~     (p=0.120 n=30+30)
RegexpMatchEasy1_1K-4       373ns ± 2%     378ns ± 3%  +1.43%  (p=0.000 n=21+26)
RegexpMatchMedium_32-4      107ns ± 2%     108ns ± 4%  +1.50%  (p=0.012 n=22+30)
RegexpMatchMedium_1K-4     34.0µs ± 1%    34.3µs ± 3%  +1.08%  (p=0.008 n=24+30)
RegexpMatchHard_32-4       1.53µs ± 3%    1.54µs ± 3%    ~     (p=0.234 n=30+30)
RegexpMatchHard_1K-4       46.7µs ± 4%    47.0µs ± 4%    ~     (p=0.420 n=30+30)
Revcomp-4                   411ms ± 7%     415ms ± 6%    ~     (p=0.059 n=30+30)
Template-4                 65.5ms ± 5%    66.9ms ± 4%  +2.21%  (p=0.001 n=30+30)
TimeParse-4                 317ns ± 3%     311ns ± 3%  -1.97%  (p=0.000 n=30+30)
TimeFormat-4                293ns ± 3%     294ns ± 3%    ~     (p=0.243 n=30+30)
[Geo mean]                 47.4µs         47.5µs       +0.17%

name                     old speed      new speed      delta
GobDecode-4               118MB/s ± 5%   118MB/s ± 6%    ~     (p=0.832 n=30+30)
GobEncode-4               125MB/s ± 7%   125MB/s ± 7%    ~     (p=0.625 n=29+30)
Gzip-4                   85.3MB/s ± 1%  86.6MB/s ± 4%    ~     (p=0.486 n=24+30)
Gunzip-4                  522MB/s ± 3%   527MB/s ± 4%    ~     (p=0.889 n=30+30)
JSONEncode-4              162MB/s ± 3%   162MB/s ± 4%    ~     (p=0.520 n=30+30)
JSONDecode-4             35.5MB/s ± 4%  35.6MB/s ± 4%    ~     (p=0.701 n=30+30)
GoParse-4                18.1MB/s ± 4%  18.1MB/s ± 4%    ~     (p=0.891 n=29+30)
RegexpMatchEasy0_32-4     416MB/s ± 4%   422MB/s ± 3%  +1.43%  (p=0.005 n=29+30)
RegexpMatchEasy0_1K-4    4.01GB/s ± 4%  4.04GB/s ± 4%    ~     (p=0.091 n=30+30)
RegexpMatchEasy1_32-4     460MB/s ± 3%   456MB/s ± 5%    ~     (p=0.123 n=30+30)
RegexpMatchEasy1_1K-4    2.74GB/s ± 2%  2.70GB/s ± 3%  -1.33%  (p=0.000 n=22+26)
RegexpMatchMedium_32-4   9.39MB/s ± 3%  9.19MB/s ± 4%  -2.06%  (p=0.001 n=28+30)
RegexpMatchMedium_1K-4   30.1MB/s ± 1%  29.8MB/s ± 3%  -1.04%  (p=0.008 n=24+30)
RegexpMatchHard_32-4     20.9MB/s ± 3%  20.8MB/s ± 3%    ~     (p=0.234 n=30+30)
RegexpMatchHard_1K-4     21.9MB/s ± 4%  21.8MB/s ± 4%    ~     (p=0.420 n=30+30)
Revcomp-4                 619MB/s ± 7%   612MB/s ± 7%    ~     (p=0.059 n=30+30)
Template-4               29.6MB/s ± 4%  29.0MB/s ± 4%  -2.16%  (p=0.002 n=30+30)
[Geo mean]                123MB/s        123MB/s       -0.33%

Change-Id: Ia59e077feae4f2824df79059daea4d0f678e3e4c
Reviewed-on: https://go-review.googlesource.com/120275
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2018-08-22 02:47:49 +00:00
Ilya Tocar
a3593685cf cmd/compile/internal/ssa: remove useless zero extension 
We generate MOVBLZX for byte-sized LoadReg, so
(MOVBQZX (LoadReg (Arg))) is the same as
(LoadReg (Arg)). Remove those zero extension where possible.
Triggers several times during all.bash.

Fixes #25378
Updates #15300

Change-Id: If50656e66f217832a13ee8f49c47997f4fcc093a
Reviewed-on: https://go-review.googlesource.com/115617
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-20 21:38:20 +00:00
Ilya Tocar
c292b32f33 cmd/compile: enable disjoint memmove inlining on amd64 
Memmove can use AVX/prefetches/other optional instructions, so
only do it for small sizes, when call overhead dominates.

Change-Id: Ice5e93deb11462217f7fb5fc350b703109bb4090
Reviewed-on: https://go-review.googlesource.com/112517
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
 2018-08-20 21:10:12 +00:00
Ben Shi
0a382e0b7f cmd/compile: optimize ARMv7 code 
"AND $0xffff0000, Rx" will be encoded to 12 bytes.
1. MOVWload from the constant pool to Rtmp
2. AND Rtmp, Rx
3. a 4-byte item in the constant pool

It can be simplified to 8 bytes on ARMv7, since ARMv7 has
"MOVW $imm-16, Rx".
1. MOVW $0xffff, Rtmp
2. BIC Rtmp, Rx

The above optimization also applies to BICconst, ADDconst and
SUBconst.

1. The total size of pkg/android_arm (excluding cmd/compile)
   decreases about 2KB.

2. The go1 benchmark shows no regression, exlcuding noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              25.5s ± 1%     25.2s ± 1%  -0.85%  (p=0.000 n=30+30)
Fannkuch11-4                13.3s ± 0%     13.3s ± 0%  +0.16%  (p=0.000 n=24+25)
FmtFprintfEmpty-4           397ns ± 0%     394ns ± 0%  -0.64%  (p=0.000 n=30+30)
FmtFprintfString-4          679ns ± 0%     678ns ± 0%    ~     (p=0.093 n=30+29)
FmtFprintfInt-4             708ns ± 0%     707ns ± 0%  -0.19%  (p=0.000 n=27+28)
FmtFprintfIntInt-4         1.05µs ± 0%    1.05µs ± 0%  -0.07%  (p=0.001 n=18+30)
FmtFprintfPrefixedInt-4    1.16µs ± 0%    1.15µs ± 0%  -0.41%  (p=0.000 n=29+30)
FmtFprintfFloat-4          2.26µs ± 0%    2.23µs ± 1%  -1.40%  (p=0.000 n=30+30)
FmtManyArgs-4              3.96µs ± 0%    3.95µs ± 0%  -0.29%  (p=0.000 n=29+30)
GobDecode-4                52.9ms ± 2%    53.4ms ± 2%  +0.92%  (p=0.004 n=28+30)
GobEncode-4                49.7ms ± 2%    49.8ms ± 2%    ~     (p=0.890 n=30+26)
Gzip-4                      2.61s ± 0%     2.60s ± 0%  -0.36%  (p=0.000 n=29+29)
Gunzip-4                    312ms ± 0%     311ms ± 0%  -0.13%  (p=0.000 n=30+28)
HTTPClientServer-4         1.02ms ± 8%    1.00ms ± 7%    ~     (p=0.224 n=29+26)
JSONEncode-4                125ms ± 1%     124ms ± 3%  -1.05%  (p=0.000 n=25+30)
JSONDecode-4                432ms ± 1%     436ms ± 2%    ~     (p=0.277 n=26+30)
Mandelbrot200-4            18.4ms ± 0%    18.4ms ± 0%  +0.02%  (p=0.001 n=28+25)
GoParse-4                  22.4ms ± 1%    22.3ms ± 1%  -0.41%  (p=0.000 n=28+28)
RegexpMatchEasy0_32-4       697ns ± 0%     706ns ± 0%  +1.23%  (p=0.000 n=19+30)
RegexpMatchEasy0_1K-4      4.27µs ± 0%    4.26µs ± 0%  -0.06%  (p=0.000 n=30+30)
RegexpMatchEasy1_32-4       741ns ± 0%     735ns ± 0%  -0.86%  (p=0.000 n=26+30)
RegexpMatchEasy1_1K-4      5.49µs ± 0%    5.49µs ± 0%  -0.03%  (p=0.023 n=25+30)
RegexpMatchMedium_32-4     1.05µs ± 2%    1.04µs ± 2%    ~     (p=0.893 n=30+30)
RegexpMatchMedium_1K-4      261µs ± 0%     261µs ± 0%  -0.11%  (p=0.000 n=29+30)
RegexpMatchHard_32-4       14.9µs ± 0%    14.9µs ± 0%  -0.36%  (p=0.000 n=23+29)
RegexpMatchHard_1K-4        446µs ± 0%     445µs ± 0%  -0.17%  (p=0.000 n=30+29)
Revcomp-4                  41.6ms ± 1%    41.7ms ± 1%  +0.27%  (p=0.040 n=28+30)
Template-4                  531ms ± 0%     532ms ± 1%    ~     (p=0.059 n=30+30)
TimeParse-4                3.40µs ± 0%    3.33µs ± 0%  -2.02%  (p=0.000 n=30+30)
TimeFormat-4               6.14µs ± 0%    6.11µs ± 0%  -0.45%  (p=0.000 n=27+29)
[Geo mean]                  384µs          383µs       -0.27%

name                     old speed      new speed      delta
GobDecode-4              14.5MB/s ± 2%  14.4MB/s ± 2%  -0.90%  (p=0.005 n=28+30)
GobEncode-4              15.4MB/s ± 2%  15.4MB/s ± 2%    ~     (p=0.741 n=30+25)
Gzip-4                   7.44MB/s ± 0%  7.47MB/s ± 1%  +0.37%  (p=0.000 n=25+30)
Gunzip-4                 62.3MB/s ± 0%  62.4MB/s ± 0%  +0.13%  (p=0.000 n=30+28)
JSONEncode-4             15.5MB/s ± 1%  15.6MB/s ± 3%  +1.07%  (p=0.000 n=25+30)
JSONDecode-4             4.48MB/s ± 0%  4.46MB/s ± 2%    ~     (p=0.655 n=23+30)
GoParse-4                2.58MB/s ± 1%  2.59MB/s ± 1%  +0.42%  (p=0.000 n=28+29)
RegexpMatchEasy0_32-4    45.9MB/s ± 0%  45.3MB/s ± 0%  -1.23%  (p=0.000 n=28+30)
RegexpMatchEasy0_1K-4     240MB/s ± 0%   240MB/s ± 0%  +0.07%  (p=0.000 n=30+30)
RegexpMatchEasy1_32-4    43.2MB/s ± 0%  43.5MB/s ± 0%  +0.85%  (p=0.000 n=30+28)
RegexpMatchEasy1_1K-4     186MB/s ± 0%   186MB/s ± 0%  +0.03%  (p=0.026 n=25+30)
RegexpMatchMedium_32-4    955kB/s ± 2%   960kB/s ± 2%    ~     (p=0.084 n=30+30)
RegexpMatchMedium_1K-4   3.92MB/s ± 0%  3.93MB/s ± 0%  +0.14%  (p=0.000 n=29+30)
RegexpMatchHard_32-4     2.14MB/s ± 0%  2.15MB/s ± 0%  +0.31%  (p=0.000 n=30+26)
RegexpMatchHard_1K-4     2.30MB/s ± 0%  2.30MB/s ± 0%    ~     (all equal)
Revcomp-4                61.1MB/s ± 1%  60.9MB/s ± 1%  -0.27%  (p=0.039 n=28+30)
Template-4               3.66MB/s ± 0%  3.65MB/s ± 1%  -0.14%  (p=0.045 n=30+30)
[Geo mean]               12.8MB/s       12.8MB/s       +0.04%

Change-Id: I02370e2584b4c041fddd324c97628fd6f0c12183
Reviewed-on: https://go-review.googlesource.com/123179
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-08-20 15:13:23 +00:00
Ben Shi
556971316f cmd/compile: optimize 386's comparison 
CMPL/CMPW/CMPB can take a memory operand on 386, and this CL
implements that optimization.

1. The total size of pkg/linux_386 decreases about 45KB, excluding
cmd/compile.

2. The go1 benchmark shows a little improvement.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.36s ± 2%     3.37s ± 3%    ~     (p=0.537 n=40+40)
Fannkuch11-4                3.59s ± 1%     3.53s ± 2%  -1.58%  (p=0.000 n=40+40)
FmtFprintfEmpty-4          46.0ns ± 3%    45.8ns ± 3%    ~     (p=0.249 n=40+40)
FmtFprintfString-4         80.0ns ± 4%    78.8ns ± 3%  -1.49%  (p=0.001 n=40+40)
FmtFprintfInt-4            89.7ns ± 2%    90.3ns ± 2%  +0.74%  (p=0.003 n=40+40)
FmtFprintfIntInt-4          144ns ± 3%     143ns ± 3%  -0.95%  (p=0.003 n=40+40)
FmtFprintfPrefixedInt-4     181ns ± 4%     180ns ± 2%    ~     (p=0.103 n=40+40)
FmtFprintfFloat-4           412ns ± 3%     408ns ± 4%  -0.97%  (p=0.018 n=40+40)
FmtManyArgs-4               607ns ± 4%     605ns ± 4%    ~     (p=0.148 n=40+40)
GobDecode-4                7.19ms ± 4%    7.24ms ± 5%    ~     (p=0.340 n=40+40)
GobEncode-4                7.04ms ± 9%    6.99ms ± 9%    ~     (p=0.289 n=40+40)
Gzip-4                      400ms ± 6%     398ms ± 5%    ~     (p=0.168 n=40+40)
Gunzip-4                   41.2ms ± 3%    41.7ms ± 3%  +1.40%  (p=0.001 n=40+40)
HTTPClientServer-4         62.5µs ± 1%    62.1µs ± 2%  -0.61%  (p=0.000 n=37+37)
JSONEncode-4               20.7ms ± 4%    20.4ms ± 3%  -1.60%  (p=0.000 n=40+40)
JSONDecode-4               69.4ms ± 4%    69.2ms ± 6%    ~     (p=0.177 n=40+40)
Mandelbrot200-4            5.22ms ± 6%    5.21ms ± 3%    ~     (p=0.531 n=40+40)
GoParse-4                  3.29ms ± 3%    3.28ms ± 3%    ~     (p=0.321 n=40+39)
RegexpMatchEasy0_32-4       104ns ± 4%     103ns ± 7%  -0.89%  (p=0.040 n=40+40)
RegexpMatchEasy0_1K-4       852ns ± 3%     853ns ± 2%    ~     (p=0.357 n=40+40)
RegexpMatchEasy1_32-4       113ns ± 8%     113ns ± 3%    ~     (p=0.906 n=40+40)
RegexpMatchEasy1_1K-4      1.03µs ± 4%    1.03µs ± 5%    ~     (p=0.326 n=40+40)
RegexpMatchMedium_32-4      136ns ± 3%     133ns ± 3%  -2.31%  (p=0.000 n=40+40)
RegexpMatchMedium_1K-4     44.0µs ± 3%    43.7µs ± 3%    ~     (p=0.053 n=40+40)
RegexpMatchHard_32-4       2.27µs ± 3%    2.26µs ± 4%    ~     (p=0.391 n=40+40)
RegexpMatchHard_1K-4       68.0µs ± 3%    68.9µs ± 3%  +1.28%  (p=0.000 n=40+40)
Revcomp-4                   1.86s ± 5%     1.86s ± 2%    ~     (p=0.950 n=40+40)
Template-4                 73.4ms ± 4%    69.9ms ± 7%  -4.78%  (p=0.000 n=40+40)
TimeParse-4                 449ns ± 4%     441ns ± 5%  -1.76%  (p=0.000 n=40+40)
TimeFormat-4                416ns ± 3%     417ns ± 4%    ~     (p=0.304 n=40+40)
[Geo mean]                 67.7µs         67.3µs       -0.55%

name                     old speed      new speed      delta
GobDecode-4               107MB/s ± 4%   106MB/s ± 5%    ~     (p=0.336 n=40+40)
GobEncode-4               109MB/s ± 5%   110MB/s ± 9%    ~     (p=0.142 n=38+40)
Gzip-4                   48.5MB/s ± 5%  48.8MB/s ± 5%    ~     (p=0.172 n=40+40)
Gunzip-4                  472MB/s ± 3%   465MB/s ± 3%  -1.39%  (p=0.001 n=40+40)
JSONEncode-4             93.6MB/s ± 4%  95.1MB/s ± 3%  +1.61%  (p=0.000 n=40+40)
JSONDecode-4             28.0MB/s ± 3%  28.1MB/s ± 6%    ~     (p=0.181 n=40+40)
GoParse-4                17.6MB/s ± 3%  17.7MB/s ± 3%    ~     (p=0.350 n=40+39)
RegexpMatchEasy0_32-4     308MB/s ± 4%   311MB/s ± 6%  +0.96%  (p=0.025 n=40+40)
RegexpMatchEasy0_1K-4    1.20GB/s ± 3%  1.20GB/s ± 2%    ~     (p=0.317 n=40+40)
RegexpMatchEasy1_32-4     282MB/s ± 7%   282MB/s ± 3%    ~     (p=0.516 n=40+40)
RegexpMatchEasy1_1K-4     994MB/s ± 4%   991MB/s ± 5%    ~     (p=0.319 n=40+40)
RegexpMatchMedium_32-4   7.31MB/s ± 3%  7.49MB/s ± 3%  +2.46%  (p=0.000 n=40+40)
RegexpMatchMedium_1K-4   23.3MB/s ± 3%  23.4MB/s ± 3%    ~     (p=0.052 n=40+40)
RegexpMatchHard_32-4     14.1MB/s ± 3%  14.1MB/s ± 4%    ~     (p=0.391 n=40+40)
RegexpMatchHard_1K-4     15.1MB/s ± 3%  14.9MB/s ± 3%  -1.27%  (p=0.000 n=40+40)
Revcomp-4                 137MB/s ± 5%   137MB/s ± 2%    ~     (p=0.942 n=40+40)
Template-4               26.5MB/s ± 4%  27.8MB/s ± 7%  +5.03%  (p=0.000 n=40+40)
[Geo mean]               78.6MB/s       79.0MB/s       +0.57%

Change-Id: Idcacc6881ef57cd7dc33aa87b711282842b72a53
Reviewed-on: https://go-review.googlesource.com/126618
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-08-20 14:23:22 +00:00
Ben Shi
b75c5c5992 cmd/compile: optimize AMD64 with more read-modify-write operations 
6 more operations which do read-modify-write with a constant
source operand are added.

1. The total size of pkg/linux_amd64 decreases about 3KB, excluding
cmd/compile.

2. The go1 benckmark shows a slight improvement.
name                     old time/op    new time/op    delta
BinaryTree17-4              2.61s ± 4%     2.67s ± 2%  +2.26%  (p=0.000 n=30+29)
Fannkuch11-4                2.39s ± 2%     2.32s ± 2%  -2.67%  (p=0.000 n=30+30)
FmtFprintfEmpty-4          44.0ns ± 4%    41.7ns ± 4%  -5.15%  (p=0.000 n=30+30)
FmtFprintfString-4         74.2ns ± 4%    72.3ns ± 4%  -2.59%  (p=0.000 n=30+30)
FmtFprintfInt-4            81.7ns ± 3%    78.8ns ± 4%  -3.54%  (p=0.000 n=27+30)
FmtFprintfIntInt-4          130ns ± 4%     124ns ± 5%  -4.60%  (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4     154ns ± 3%     152ns ± 3%  -1.13%  (p=0.012 n=30+30)
FmtFprintfFloat-4           215ns ± 4%     212ns ± 5%  -1.56%  (p=0.002 n=30+30)
FmtManyArgs-4               522ns ± 3%     512ns ± 3%  -1.84%  (p=0.001 n=30+30)
GobDecode-4                6.42ms ± 5%    6.49ms ± 7%    ~     (p=0.070 n=30+30)
GobEncode-4                6.07ms ± 8%    5.98ms ± 8%    ~     (p=0.150 n=30+30)
Gzip-4                      236ms ± 4%     223ms ± 4%  -5.57%  (p=0.000 n=30+30)
Gunzip-4                   37.4ms ± 3%    36.7ms ± 4%  -2.03%  (p=0.000 n=30+30)
HTTPClientServer-4         58.7µs ± 1%    58.5µs ± 2%  -0.37%  (p=0.018 n=30+29)
JSONEncode-4               12.0ms ± 4%    12.1ms ± 3%    ~     (p=0.112 n=30+30)
JSONDecode-4               54.5ms ± 3%    55.5ms ± 4%  +1.80%  (p=0.006 n=30+30)
Mandelbrot200-4            3.78ms ± 4%    3.78ms ± 4%    ~     (p=0.173 n=30+30)
GoParse-4                  3.16ms ± 5%    3.22ms ± 5%  +1.75%  (p=0.010 n=30+30)
RegexpMatchEasy0_32-4      76.6ns ± 1%    75.9ns ± 3%    ~     (p=0.672 n=25+30)
RegexpMatchEasy0_1K-4       252ns ± 3%     253ns ± 3%  +0.57%  (p=0.027 n=30+30)
RegexpMatchEasy1_32-4      69.8ns ± 4%    70.2ns ± 6%    ~     (p=0.539 n=30+30)
RegexpMatchEasy1_1K-4       374ns ± 3%     373ns ± 5%    ~     (p=0.263 n=30+30)
RegexpMatchMedium_32-4      107ns ± 4%     109ns ± 3%    ~     (p=0.067 n=30+30)
RegexpMatchMedium_1K-4     33.9µs ± 5%    34.1µs ± 4%    ~     (p=0.297 n=30+30)
RegexpMatchHard_32-4       1.54µs ± 3%    1.56µs ± 4%  +1.43%  (p=0.002 n=30+30)
RegexpMatchHard_1K-4       46.6µs ± 3%    47.0µs ± 3%    ~     (p=0.055 n=30+30)
Revcomp-4                   411ms ± 6%     407ms ± 6%    ~     (p=0.219 n=30+30)
Template-4                 66.8ms ± 3%    64.8ms ± 5%  -3.01%  (p=0.000 n=30+30)
TimeParse-4                 312ns ± 2%     319ns ± 3%  +2.50%  (p=0.000 n=30+30)
TimeFormat-4                296ns ± 5%     299ns ± 3%  +0.93%  (p=0.005 n=30+30)
[Geo mean]                 47.5µs         47.1µs       -0.75%

name                     old speed      new speed      delta
GobDecode-4               120MB/s ± 5%   118MB/s ± 6%    ~     (p=0.072 n=30+30)
GobEncode-4               127MB/s ± 8%   129MB/s ± 8%    ~     (p=0.150 n=30+30)
Gzip-4                   82.1MB/s ± 4%  87.0MB/s ± 4%  +5.90%  (p=0.000 n=30+30)
Gunzip-4                  519MB/s ± 4%   529MB/s ± 4%  +2.07%  (p=0.001 n=30+30)
JSONEncode-4              162MB/s ± 4%   161MB/s ± 3%    ~     (p=0.110 n=30+30)
JSONDecode-4             35.6MB/s ± 3%  35.0MB/s ± 4%  -1.77%  (p=0.007 n=30+30)
GoParse-4                18.3MB/s ± 4%  18.0MB/s ± 4%  -1.72%  (p=0.009 n=30+30)
RegexpMatchEasy0_32-4     418MB/s ± 1%   422MB/s ± 3%    ~     (p=0.645 n=25+30)
RegexpMatchEasy0_1K-4    4.06GB/s ± 3%  4.04GB/s ± 3%  -0.57%  (p=0.033 n=30+30)
RegexpMatchEasy1_32-4     459MB/s ± 4%   456MB/s ± 6%    ~     (p=0.530 n=30+30)
RegexpMatchEasy1_1K-4    2.73GB/s ± 3%  2.75GB/s ± 5%    ~     (p=0.279 n=30+30)
RegexpMatchMedium_32-4   9.28MB/s ± 5%  9.18MB/s ± 4%    ~     (p=0.086 n=30+30)
RegexpMatchMedium_1K-4   30.2MB/s ± 4%  30.0MB/s ± 4%    ~     (p=0.300 n=30+30)
RegexpMatchHard_32-4     20.8MB/s ± 3%  20.5MB/s ± 4%  -1.41%  (p=0.002 n=30+30)
RegexpMatchHard_1K-4     22.0MB/s ± 3%  21.8MB/s ± 3%    ~     (p=0.051 n=30+30)
Revcomp-4                 619MB/s ± 7%   625MB/s ± 7%    ~     (p=0.219 n=30+30)
Template-4               29.0MB/s ± 3%  29.9MB/s ± 4%  +3.11%  (p=0.000 n=30+30)
[Geo mean]                123MB/s        123MB/s       +0.28%

Change-Id: I850652cfd53329c1af804b7f57f4393d8097bb0d
Reviewed-on: https://go-review.googlesource.com/121135
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2018-08-20 14:18:39 +00:00
Ben Shi
de0e72610b test/codegen: add more combined store tests for arm64 
Some combined store optimization was already implemented
in go-1.11, but there is no corresponding test cases.

Change-Id: Iebdad186e92047942e53a74f2c20b390922e1e9c
Reviewed-on: https://go-review.googlesource.com/122915
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-08-02 04:23:45 +00:00
Ben Shi
f9800a9473 test/codegen: add more test cases for arm64 
More test cases of combined load for arm64.

Change-Id: I7a9f4dcec6930f161cbded1f47dbf7fcef1db4f1
Reviewed-on: https://go-review.googlesource.com/122582
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-07-10 15:41:15 +00:00
Ben Shi
8a85bce215 test/codegen: improve test cases for arm64 
1. Some incorrect test cases are disabled.
2. Some wrong test cases are corrected.
3. Some new test cases are added.

Change-Id: Ib5d0473d55159f233ddab79f96967eaec7b08597
Reviewed-on: https://go-review.googlesource.com/113736
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-05-22 14:50:41 +00:00
David Chase
c2c1822b12 cmd/compile: assign and preserve statement boundaries. 
A new pass run after ssa building (before any other
optimization) identifies the "first" ssa node for each
statement. Other "noise" nodes are tagged as being never
appropriate for a statement boundary (e.g., VarKill, VarDef,
Phi).

Rewrite, deadcode, cse, and nilcheck are modified to move
the statement boundaries forward whenever possible if a
boundary-tagged ssa value is removed; never-boundary nodes
are ignored in this search (some operations involving
constants are also tagged as never-boundary and also ignored
because they are likely to be moved or removed during
optimization).

Code generation treats all nodes except those explicitly
marked as statement boundaries as "not statement" nodes,
and floats statement boundaries to the beginning of each
same-line run of instructions found within a basic block.

Line number html conversion was modified to make statement
boundary nodes a bit more obvious by prepending a "+".

The code in fuse.go that glued together the value slices
of two blocks produced a result that depended on the
former capacities (not lengths) of the two slices.  This
causes differences in the 386 bootstrap, and also can
sometimes put values into an order that does a worse job
of preserving statement boundaries when values are removed.

Portions of two delve tests that had caught problems were
incorporated into ssa/debug_test.go.  There are some
opportunities to do better with optimized code, but the
next-ing is not lying or overly jumpy.

Over 4 CLs, compilebench geomean measured binary size
increase of 3.5% and compile user time increase of 3.8%
(this is after optimization to reuse a sparse map instead
of creating multiple maps.)

This CL worsens the optimized-debugging experience with
Delve; we need to work with the delve team so that
they can use the is_stmt marks that we're emitting now.

The reference output changes from time to time depending
on other changes in the compiler, sometimes better,
sometimes worse.

This CL now includes a test ensuring that 99+% of the lines
in the Go command itself (a handy optimized binary) include
is_stmt markers.

Change-Id: I359c94e06843f1eb41f9da437bd614885aa9644a
Reviewed-on: https://go-review.googlesource.com/102435
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
 2018-05-14 14:09:49 +00:00
Lynn Boger
e4172e5f5e cmd/compile/internal/ssa: initialize t.UInt in SetTypPtrs() 
Initialization of t.UInt is missing from SetTypPtrs in config.go,
preventing rules that use it from matching when they should.
This adds the initialization to allow those rules to work.

Updated test/codegen/rotate.go to test for this case, which
appears in math/bits RotateLeft32 and RotateLeft64. There had been
a testcase for this in go 1.10 but that went away when asm_test.go
was removed.

Change-Id: I82fc825ad8364df6fc36a69a1e448214d2e24ed5
Reviewed-on: https://go-review.googlesource.com/112518
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-05-10 14:50:30 +00:00
Michael Munday
6d00e8c478 cmd/compile: convert memmove call into Move when arguments are disjoint 
Move ops can be faster than memmove calls because the number of bytes
to be moved is fixed and they don't incur the overhead of a call.
This change allows memmove to be converted into a Move op when the
arguments are disjoint.

The optimization is only enabled on s390x at the moment, however
other architectures may also benefit from it in the future. The
memmove inlining rule triggers an extra 12 times when compiling the
standard library. It will most likely make more of a difference as the
disjoint function is improved over time (to recognize fresh heap
allocations for example).

Change-Id: I9af570dcfff28257b8e59e0ff584a46d8e248310
Reviewed-on: https://go-review.googlesource.com/110064
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2018-05-09 11:20:40 +00:00
Martin Möhrmann
aee71dd70b cmd/compile: optimize map-clearing range idiom 
replace map clears of the form:

        for k := range m {
                delete(m, k)
        }

(where m is map with key type that is reflexive for ==)
with a new runtime function that clears the maps backing
array with a memclr and reinitializes the hmap struct.

Map key types that for example contain floats are not
replaced by this optimization since NaN keys cannot
be deleted from maps using delete.

name                           old time/op  new time/op  delta
GoMapClear/Reflexive/1         92.2ns ± 1%  47.1ns ± 2%  -48.89%  (p=0.000 n=9+9)
GoMapClear/Reflexive/10         108ns ± 1%    48ns ± 2%  -55.68%  (p=0.000 n=10+10)
GoMapClear/Reflexive/100        303ns ± 2%   110ns ± 3%  -63.56%  (p=0.000 n=10+10)
GoMapClear/Reflexive/1000      3.58µs ± 3%  1.23µs ± 2%  -65.49%  (p=0.000 n=9+10)
GoMapClear/Reflexive/10000     28.2µs ± 3%  10.3µs ± 2%  -63.55%  (p=0.000 n=9+10)
GoMapClear/NonReflexive/1       121ns ± 2%   124ns ± 7%     ~     (p=0.097 n=10+10)
GoMapClear/NonReflexive/10      137ns ± 2%   139ns ± 3%   +1.53%  (p=0.033 n=10+10)
GoMapClear/NonReflexive/100     331ns ± 3%   334ns ± 2%     ~     (p=0.342 n=10+10)
GoMapClear/NonReflexive/1000   3.64µs ± 3%  3.64µs ± 2%     ~     (p=0.887 n=9+10)
GoMapClear/NonReflexive/10000  28.1µs ± 2%  28.4µs ± 3%     ~     (p=0.247 n=10+10)

Fixes #20138

Change-Id: I181332a8ef434a4f0d89659f492d8711db3f3213
Reviewed-on: https://go-review.googlesource.com/110055
Reviewed-by: Keith Randall <khr@golang.org>
 2018-05-08 21:15:16 +00:00
Michael Munday
8af0c77df3 cmd/compile: simplify shift lowering on s390x 
Use conditional moves instead of subtractions with borrow to handle
saturation cases. This allows us to delete the SUBE/SUBEW ops and
associated rules from the SSA backend. Using conditional moves also
means we can detect when shift values are masked so I've added some
new rules to constant fold the relevant comparisons and masking ops.

Also use the new shiftIsBounded() function to avoid generating code
to handle saturation cases where possible.

Updates #25167 for s390x.

Change-Id: Ief9991c91267c9151ce4c5ec07642abb4dcc1c0d
Reviewed-on: https://go-review.googlesource.com/110070
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-05-08 16:19:56 +00:00
Lynn Boger
28edaf4584 cmd/compile,test: combine byte loads and stores on ppc64le 
CL 74410 added rules to combine consecutive byte loads and
stores when the byte order was little endian for ppc64le. This
is the corresponding change for bytes that are in big endian order.
These rules are all intended for a little endian target arch.

This adds new testcases in test/codegen/memcombine.go

Fixes #22496
Updates #24242

Benchmark improvement for encoding/binary:
name                      old time/op    new time/op    delta
ReadSlice1000Int32s-16      11.0µs ± 0%     9.0µs ± 0%  -17.47%  (p=0.029 n=4+4)
ReadStruct-16               2.47µs ± 1%    2.48µs ± 0%   +0.67%  (p=0.114 n=4+4)
ReadInts-16                  642ns ± 1%     630ns ± 1%   -2.02%  (p=0.029 n=4+4)
WriteInts-16                 654ns ± 0%     653ns ± 1%   -0.08%  (p=0.629 n=4+4)
WriteSlice1000Int32s-16     8.75µs ± 0%    8.20µs ± 0%   -6.19%  (p=0.029 n=4+4)
PutUint16-16                1.16ns ± 0%    0.93ns ± 0%  -19.83%  (p=0.029 n=4+4)
PutUint32-16                1.16ns ± 0%    0.93ns ± 0%  -19.83%  (p=0.029 n=4+4)
PutUint64-16                1.85ns ± 0%    0.93ns ± 0%  -49.73%  (p=0.029 n=4+4)
LittleEndianPutUint16-16    1.03ns ± 0%    0.93ns ± 0%   -9.71%  (p=0.029 n=4+4)
LittleEndianPutUint32-16    0.93ns ± 0%    0.93ns ± 0%     ~     (all equal)
LittleEndianPutUint64-16    0.93ns ± 0%    0.93ns ± 0%     ~     (all equal)
PutUvarint32-16             43.0ns ± 0%    43.1ns ± 0%   +0.12%  (p=0.429 n=4+4)
PutUvarint64-16              174ns ± 0%     175ns ± 0%   +0.29%  (p=0.429 n=4+4)

Updates made to functions in gcm.go to enable their matching. An existing
testcase prevents these functions from being replaced by those in encoding/binary
due to import dependencies.

Change-Id: Idb3bd1e6e7b12d86cd828fb29cb095848a3e485a
Reviewed-on: https://go-review.googlesource.com/98136
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-05-08 13:15:39 +00:00
Michael Munday
f31a18ded4 cmd/compile: add some generic composite type optimizations 
Propagate values through some wide Zero/Move operations. Among
other things this allows us to optimize some kinds of array
initialization. For example, the following code no longer
requires a temporary be allocated on the stack. Instead it
writes the values directly into the return value.

func f(i uint32) [4]uint32 {
    return [4]uint32{i, i+1, i+2, i+3}
}

The return value is unnecessarily cleared but removing that is
probably a task for dead store analysis (I think it needs to
be able to match multiple Store ops to wide Zero ops).

In order to reliably remove stack variables that are rendered
unnecessary by these new rules I've added a new generic version
of the unread autos elimination pass.

These rules are triggered more than 5000 times when building and
testing the standard library.

Updates #15925 (fixes for arrays of up to 4 elements).
Updates #24386 (fixes for up to 4 kept elements).
Updates #24416.

compilebench results:

name       old time/op       new time/op       delta
Template         353ms ± 5%        359ms ± 3%    ~     (p=0.143 n=10+10)
Unicode          219ms ± 1%        217ms ± 4%    ~     (p=0.740 n=7+10)
GoTypes          1.26s ± 1%        1.26s ± 2%    ~     (p=0.549 n=9+10)
Compiler         6.00s ± 1%        6.08s ± 1%  +1.42%  (p=0.000 n=9+8)
SSA              15.3s ± 2%        15.6s ± 1%  +2.43%  (p=0.000 n=10+10)
Flate            237ms ± 2%        240ms ± 2%  +1.31%  (p=0.015 n=10+10)
GoParser         285ms ± 1%        285ms ± 1%    ~     (p=0.878 n=8+8)
Reflect          797ms ± 3%        807ms ± 2%    ~     (p=0.065 n=9+10)
Tar              334ms ± 0%        335ms ± 4%    ~     (p=0.460 n=8+10)
XML              419ms ± 0%        423ms ± 1%  +0.91%  (p=0.001 n=7+9)
StdCmd           46.0s ± 0%        46.4s ± 0%  +0.85%  (p=0.000 n=9+9)

name       old user-time/op  new user-time/op  delta
Template         337ms ± 3%        346ms ± 5%    ~     (p=0.053 n=9+10)
Unicode          205ms ±10%        205ms ± 8%    ~     (p=1.000 n=10+10)
GoTypes          1.22s ± 2%        1.21s ± 3%    ~     (p=0.436 n=10+10)
Compiler         5.85s ± 1%        5.93s ± 0%  +1.46%  (p=0.000 n=10+8)
SSA              14.9s ± 1%        15.3s ± 1%  +2.62%  (p=0.000 n=10+10)
Flate            229ms ± 4%        228ms ± 6%    ~     (p=0.796 n=10+10)
GoParser         271ms ± 3%        275ms ± 4%    ~     (p=0.165 n=10+10)
Reflect          779ms ± 5%        775ms ± 2%    ~     (p=0.971 n=10+10)
Tar              317ms ± 4%        319ms ± 5%    ~     (p=0.853 n=10+10)
XML              404ms ± 4%        409ms ± 5%    ~     (p=0.436 n=10+10)

name       old alloc/op      new alloc/op      delta
Template        34.9MB ± 0%       35.0MB ± 0%  +0.26%  (p=0.000 n=10+10)
Unicode         29.3MB ± 0%       29.3MB ± 0%  +0.02%  (p=0.000 n=10+10)
GoTypes          115MB ± 0%        115MB ± 0%  +0.30%  (p=0.000 n=10+10)
Compiler         519MB ± 0%        521MB ± 0%  +0.30%  (p=0.000 n=10+10)
SSA             1.55GB ± 0%       1.57GB ± 0%  +1.34%  (p=0.000 n=10+9)
Flate           24.1MB ± 0%       24.2MB ± 0%  +0.10%  (p=0.000 n=10+10)
GoParser        28.1MB ± 0%       28.1MB ± 0%  +0.07%  (p=0.000 n=10+10)
Reflect         78.7MB ± 0%       78.7MB ± 0%  +0.03%  (p=0.000 n=8+10)
Tar             34.4MB ± 0%       34.5MB ± 0%  +0.12%  (p=0.000 n=10+10)
XML             43.2MB ± 0%       43.2MB ± 0%  +0.13%  (p=0.000 n=10+10)

name       old allocs/op     new allocs/op     delta
Template          330k ± 0%         330k ± 0%  -0.01%  (p=0.017 n=10+10)
Unicode           337k ± 0%         337k ± 0%  +0.01%  (p=0.000 n=9+10)
GoTypes          1.15M ± 0%        1.15M ± 0%  +0.03%  (p=0.000 n=10+10)
Compiler         4.77M ± 0%        4.77M ± 0%  +0.03%  (p=0.000 n=9+10)
SSA              12.5M ± 0%        12.6M ± 0%  +1.16%  (p=0.000 n=10+10)
Flate             221k ± 0%         221k ± 0%  +0.05%  (p=0.000 n=9+10)
GoParser          275k ± 0%         275k ± 0%  +0.01%  (p=0.014 n=10+9)
Reflect           944k ± 0%         944k ± 0%  -0.02%  (p=0.000 n=10+10)
Tar               324k ± 0%         323k ± 0%  -0.12%  (p=0.000 n=10+10)
XML               384k ± 0%         384k ± 0%  -0.01%  (p=0.001 n=10+10)

name       old object-bytes  new object-bytes  delta
Template         476kB ± 0%        476kB ± 0%  -0.04%  (p=0.000 n=10+10)
Unicode          218kB ± 0%        218kB ± 0%    ~     (all equal)
GoTypes         1.58MB ± 0%       1.58MB ± 0%  -0.04%  (p=0.000 n=10+10)
Compiler        6.25MB ± 0%       6.24MB ± 0%  -0.09%  (p=0.000 n=10+10)
SSA             15.9MB ± 0%       16.1MB ± 0%  +1.22%  (p=0.000 n=10+10)
Flate            304kB ± 0%        304kB ± 0%  -0.13%  (p=0.000 n=10+10)
GoParser         370kB ± 0%        370kB ± 0%  -0.00%  (p=0.000 n=10+10)
Reflect         1.27MB ± 0%       1.27MB ± 0%  -0.12%  (p=0.000 n=10+10)
Tar              421kB ± 0%        419kB ± 0%  -0.64%  (p=0.000 n=10+10)
XML              518kB ± 0%        517kB ± 0%  -0.12%  (p=0.000 n=10+10)

name       old export-bytes  new export-bytes  delta
Template        16.7kB ± 0%       16.7kB ± 0%    ~     (all equal)
Unicode         6.52kB ± 0%       6.52kB ± 0%    ~     (all equal)
GoTypes         29.2kB ± 0%       29.2kB ± 0%    ~     (all equal)
Compiler        88.0kB ± 0%       88.0kB ± 0%    ~     (all equal)
SSA              109kB ± 0%        109kB ± 0%    ~     (all equal)
Flate           4.49kB ± 0%       4.49kB ± 0%    ~     (all equal)
GoParser        8.10kB ± 0%       8.10kB ± 0%    ~     (all equal)
Reflect         7.71kB ± 0%       7.71kB ± 0%    ~     (all equal)
Tar             9.15kB ± 0%       9.15kB ± 0%    ~     (all equal)
XML             12.3kB ± 0%       12.3kB ± 0%    ~     (all equal)

name       old text-bytes    new text-bytes    delta
HelloSize        676kB ± 0%        672kB ± 0%  -0.59%  (p=0.000 n=10+10)
CmdGoSize       7.26MB ± 0%       7.24MB ± 0%  -0.18%  (p=0.000 n=10+10)

name       old data-bytes    new data-bytes    delta
HelloSize       10.2kB ± 0%       10.2kB ± 0%    ~     (all equal)
CmdGoSize        248kB ± 0%        248kB ± 0%    ~     (all equal)

name       old bss-bytes     new bss-bytes     delta
HelloSize        125kB ± 0%        125kB ± 0%    ~     (all equal)
CmdGoSize        145kB ± 0%        145kB ± 0%    ~     (all equal)

name       old exe-bytes     new exe-bytes     delta
HelloSize       1.46MB ± 0%       1.45MB ± 0%  -0.31%  (p=0.000 n=10+10)
CmdGoSize       14.7MB ± 0%       14.7MB ± 0%  -0.17%  (p=0.000 n=10+10)

Change-Id: Ic72b0c189dd542f391e1c9ab88a76e9148dc4285
Reviewed-on: https://go-review.googlesource.com/106495
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-05-08 10:31:21 +00:00
Ben Shi
098ca846c7 cmd/compile: emit more compact 386 instructions 
ADDL/SUBL/ANDL/ORL/XORL can have a memory operand as destination,
and this CL optimize the compiler to emit such instructions on
386 for more compact binary.

Here is test report:
1. The total size of pkg/linux_386/ and pkg/tool/linux_386/ decreases
about 14KB.
(pkg/linux_386/cmd/compile/ and pkg/tool/linux_386/compile are excluded)

2. The go1 benchmark shows little change, excluding ±2% noise.
name                     old time/op    new time/op    delta
BinaryTree17-4              3.34s ± 2%     3.38s ± 2%  +1.27%  (p=0.000 n=40+39)
Fannkuch11-4                3.55s ± 1%     3.51s ± 1%  -1.33%  (p=0.000 n=40+40)
FmtFprintfEmpty-4          46.3ns ± 3%    46.9ns ± 4%  +1.41%  (p=0.002 n=40+40)
FmtFprintfString-4         80.8ns ± 3%    80.4ns ± 6%  -0.54%  (p=0.044 n=40+40)
FmtFprintfInt-4            93.0ns ± 3%    92.2ns ± 4%  -0.88%  (p=0.007 n=39+40)
FmtFprintfIntInt-4          144ns ± 5%     145ns ± 2%  +0.78%  (p=0.015 n=40+40)
FmtFprintfPrefixedInt-4     184ns ± 2%     182ns ± 2%  -1.06%  (p=0.004 n=40+40)
FmtFprintfFloat-4           415ns ± 4%     419ns ± 4%    ~     (p=0.434 n=40+40)
FmtManyArgs-4               615ns ± 3%     619ns ± 3%    ~     (p=0.100 n=40+40)
GobDecode-4                7.30ms ± 6%    7.36ms ± 6%    ~     (p=0.074 n=40+40)
GobEncode-4                7.10ms ± 6%    7.21ms ± 5%    ~     (p=0.082 n=40+39)
Gzip-4                      364ms ± 3%     362ms ± 6%  -0.71%  (p=0.020 n=40+40)
Gunzip-4                   42.4ms ± 3%    42.2ms ± 3%    ~     (p=0.303 n=40+40)
HTTPClientServer-4         62.9µs ± 1%    62.9µs ± 1%    ~     (p=0.768 n=38+39)
JSONEncode-4               21.4ms ± 4%    21.5ms ± 5%    ~     (p=0.210 n=40+40)
JSONDecode-4               67.7ms ± 3%    67.9ms ± 4%    ~     (p=0.713 n=40+40)
Mandelbrot200-4            5.18ms ± 3%    5.21ms ± 3%  +0.59%  (p=0.021 n=40+40)
GoParse-4                  3.35ms ± 3%    3.34ms ± 2%    ~     (p=0.996 n=40+40)
RegexpMatchEasy0_32-4      98.5ns ± 5%    96.3ns ± 4%  -2.15%  (p=0.001 n=40+40)
RegexpMatchEasy0_1K-4       851ns ± 4%     850ns ± 5%    ~     (p=0.700 n=40+40)
RegexpMatchEasy1_32-4       105ns ± 7%     107ns ± 4%  +1.50%  (p=0.017 n=40+40)
RegexpMatchEasy1_1K-4      1.03µs ± 5%    1.03µs ± 4%    ~     (p=0.992 n=40+40)
RegexpMatchMedium_32-4      130ns ± 6%     128ns ± 4%  -1.66%  (p=0.012 n=40+40)
RegexpMatchMedium_1K-4     44.0µs ± 5%    43.6µs ± 3%    ~     (p=0.704 n=40+40)
RegexpMatchHard_32-4       2.29µs ± 3%    2.23µs ± 4%  -2.38%  (p=0.000 n=40+40)
RegexpMatchHard_1K-4       69.0µs ± 3%    68.1µs ± 3%  -1.28%  (p=0.003 n=40+40)
Revcomp-4                   1.85s ± 2%     1.87s ± 3%  +1.11%  (p=0.000 n=40+40)
Template-4                 69.8ms ± 3%    69.6ms ± 3%    ~     (p=0.125 n=40+40)
TimeParse-4                 442ns ± 5%     440ns ± 3%    ~     (p=0.585 n=40+40)
TimeFormat-4                419ns ± 3%     420ns ± 3%    ~     (p=0.824 n=40+40)
[Geo mean]                 67.3µs         67.2µs       -0.11%

name                     old speed      new speed      delta
GobDecode-4               105MB/s ± 6%   104MB/s ± 6%    ~     (p=0.074 n=40+40)
GobEncode-4               108MB/s ± 7%   107MB/s ± 5%    ~     (p=0.080 n=40+39)
Gzip-4                   53.3MB/s ± 3%  53.7MB/s ± 6%  +0.73%  (p=0.021 n=40+40)
Gunzip-4                  458MB/s ± 3%   460MB/s ± 3%    ~     (p=0.301 n=40+40)
JSONEncode-4             90.8MB/s ± 4%  90.3MB/s ± 4%    ~     (p=0.213 n=40+40)
JSONDecode-4             28.7MB/s ± 3%  28.6MB/s ± 4%    ~     (p=0.679 n=40+40)
GoParse-4                17.3MB/s ± 3%  17.3MB/s ± 2%    ~     (p=1.000 n=40+40)
RegexpMatchEasy0_32-4     325MB/s ± 5%   333MB/s ± 4%  +2.44%  (p=0.000 n=40+38)
RegexpMatchEasy0_1K-4    1.20GB/s ± 4%  1.21GB/s ± 5%    ~     (p=0.684 n=40+40)
RegexpMatchEasy1_32-4     303MB/s ± 7%   298MB/s ± 4%  -1.52%  (p=0.022 n=40+40)
RegexpMatchEasy1_1K-4     995MB/s ± 5%   996MB/s ± 4%    ~     (p=0.996 n=40+40)
RegexpMatchMedium_32-4   7.67MB/s ± 6%  7.80MB/s ± 4%  +1.68%  (p=0.011 n=40+40)
RegexpMatchMedium_1K-4   23.3MB/s ± 5%  23.5MB/s ± 3%    ~     (p=0.697 n=40+40)
RegexpMatchHard_32-4     14.0MB/s ± 3%  14.3MB/s ± 4%  +2.43%  (p=0.000 n=40+40)
RegexpMatchHard_1K-4     14.8MB/s ± 3%  15.0MB/s ± 3%  +1.30%  (p=0.003 n=40+40)
Revcomp-4                 137MB/s ± 2%   136MB/s ± 3%  -1.10%  (p=0.000 n=40+40)
Template-4               27.8MB/s ± 3%  27.9MB/s ± 3%    ~     (p=0.128 n=40+40)
[Geo mean]               79.6MB/s       79.9MB/s       +0.28%

Change-Id: I02a3efc125dc81e18fc8495eb2bf1bba59ab8733
Reviewed-on: https://go-review.googlesource.com/110157
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
 2018-05-08 06:44:54 +00:00
Martin Möhrmann
b9a59d9f2e cmd/compile: optimize len([]rune(string)) 
Adds a new runtime function to count runes in a string.
Modifies the compiler to detect the pattern len([]rune(string))
and replaces it with the new rune counting runtime function.

RuneCount/lenruneslice/ASCII                  27.8ns ± 2%  14.5ns ± 3%  -47.70%  (p=0.000 n=10+10)
RuneCount/lenruneslice/Japanese                126ns ± 2%    60ns ± 2%  -52.03%  (p=0.000 n=10+10)
RuneCount/lenruneslice/MixedLength             104ns ± 2%    50ns ± 1%  -51.71%  (p=0.000 n=10+9)

Fixes #24923

Change-Id: Ie9c7e7391a4e2cca675c5cdcc1e5ce7d523948b9
Reviewed-on: https://go-review.googlesource.com/108985
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2018-05-06 05:31:01 +00:00
Martin Möhrmann
a8a60ac2a7 cmd/compile: optimize append(x, make([]T, y)...) slice extension 
Changes the compiler to recognize the slice extension pattern

  append(x, make([]T, y)...)

and replace it with growslice and an optional memclr to avoid an allocation for make([]T, y).

Memclr is not called in case growslice already allocated a new cleared backing array
when T contains pointers.

amd64:
name                      old time/op    new time/op    delta
ExtendSlice/IntSlice         103ns ± 4%      57ns ± 4%   -44.55%  (p=0.000 n=18+18)
ExtendSlice/PointerSlice     155ns ± 3%      77ns ± 3%   -49.93%  (p=0.000 n=20+20)
ExtendSlice/NoGrow          50.2ns ± 3%     5.2ns ± 2%   -89.67%  (p=0.000 n=18+18)

name                      old alloc/op   new alloc/op   delta
ExtendSlice/IntSlice         64.0B ± 0%     32.0B ± 0%   -50.00%  (p=0.000 n=20+20)
ExtendSlice/PointerSlice     64.0B ± 0%     32.0B ± 0%   -50.00%  (p=0.000 n=20+20)
ExtendSlice/NoGrow           32.0B ± 0%      0.0B       -100.00%  (p=0.000 n=20+20)

name                      old allocs/op  new allocs/op  delta
ExtendSlice/IntSlice          2.00 ± 0%      1.00 ± 0%   -50.00%  (p=0.000 n=20+20)
ExtendSlice/PointerSlice      2.00 ± 0%      1.00 ± 0%   -50.00%  (p=0.000 n=20+20)
ExtendSlice/NoGrow            1.00 ± 0%      0.00       -100.00%  (p=0.000 n=20+20)

Fixes #21266

Change-Id: Idc3077665f63cbe89762b590c5967a864fd1c07f
Reviewed-on: https://go-review.googlesource.com/109517
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 2018-05-06 04:28:23 +00:00
Martin Möhrmann
500d79c410 cmd/compile: refactor memclrrange for arrays and slices 
Rename memclrrange to signify that it does not handle
all types of range clears.

Simplify checks to detect the range clear idiom for
arrays and slices.

Add tests to verify the optimization for the slice
range clear idiom is being applied by the compiler.

Change-Id: I5c3b7c9a479699ebdb4c407fde692f30f377860c
Reviewed-on: https://go-review.googlesource.com/110477
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-05-02 04:20:25 +00:00
Ben Shi
aaf73c6d1e cmd/compile: optimize ARM64 with shifted register indexed load/store 
ARM64 supports efficient instructions which combine shift, addition, load/store
together. Such as "MOVD (R0)(R1<<3), R2" and "MOVWU R6, (R4)(R1<<2)".

This CL optimizes the compiler to emit such efficient instuctions. And below
is some test data.

1. binary size before/after
binary                 size change
pkg/linux_arm64        +80.1KB
pkg/tool/linux_arm64   +121.9KB
go                     -4.3KB
gofmt                  -64KB

2. go1 benchmark
There is big improvement for the test case Fannkuch11, and slight
improvement for sme others, excluding noise.

name                     old time/op    new time/op    delta
BinaryTree17-4              43.9s ± 2%     44.0s ± 2%     ~     (p=0.820 n=30+30)
Fannkuch11-4                30.6s ± 2%     24.5s ± 3%  -19.93%  (p=0.000 n=25+30)
FmtFprintfEmpty-4           500ns ± 0%     499ns ± 0%   -0.11%  (p=0.000 n=23+25)
FmtFprintfString-4         1.03µs ± 0%    1.04µs ± 3%     ~     (p=0.065 n=29+30)
FmtFprintfInt-4            1.15µs ± 3%    1.15µs ± 4%   -0.56%  (p=0.000 n=30+30)
FmtFprintfIntInt-4         1.80µs ± 5%    1.82µs ± 0%     ~     (p=0.094 n=30+24)
FmtFprintfPrefixedInt-4    2.17µs ± 5%    2.20µs ± 0%     ~     (p=0.100 n=30+23)
FmtFprintfFloat-4          3.08µs ± 3%    3.09µs ± 4%     ~     (p=0.123 n=30+30)
FmtManyArgs-4              7.41µs ± 4%    7.17µs ± 1%   -3.26%  (p=0.000 n=30+23)
GobDecode-4                93.7ms ± 0%    94.7ms ± 4%     ~     (p=0.685 n=24+30)
GobEncode-4                78.7ms ± 7%    77.1ms ± 0%     ~     (p=0.729 n=30+23)
Gzip-4                      4.01s ± 0%     3.97s ± 5%   -1.11%  (p=0.037 n=24+30)
Gunzip-4                    389ms ± 4%     384ms ± 0%     ~     (p=0.155 n=30+23)
HTTPClientServer-4          536µs ± 1%     537µs ± 1%     ~     (p=0.236 n=30+30)
JSONEncode-4                179ms ± 1%     182ms ± 6%     ~     (p=0.763 n=24+30)
JSONDecode-4                843ms ± 0%     839ms ± 6%   -0.42%  (p=0.003 n=25+30)
Mandelbrot200-4            46.5ms ± 0%    46.5ms ± 0%   +0.02%  (p=0.000 n=26+26)
GoParse-4                  44.3ms ± 6%    43.3ms ± 0%     ~     (p=0.067 n=30+27)
RegexpMatchEasy0_32-4      1.07µs ± 7%    1.07µs ± 4%     ~     (p=0.835 n=30+30)
RegexpMatchEasy0_1K-4      5.51µs ± 0%    5.49µs ± 0%   -0.35%  (p=0.000 n=23+26)
RegexpMatchEasy1_32-4      1.01µs ± 0%    1.02µs ± 4%   +0.96%  (p=0.014 n=24+30)
RegexpMatchEasy1_1K-4      7.43µs ± 0%    7.18µs ± 0%   -3.41%  (p=0.000 n=23+24)
RegexpMatchMedium_32-4     1.78µs ± 0%    1.81µs ± 4%   +1.47%  (p=0.012 n=23+30)
RegexpMatchMedium_1K-4      547µs ± 1%     542µs ± 3%   -0.90%  (p=0.003 n=24+30)
RegexpMatchHard_32-4       30.4µs ± 0%    29.7µs ± 0%   -2.15%  (p=0.000 n=19+23)
RegexpMatchHard_1K-4        913µs ± 0%     915µs ± 6%   +0.25%  (p=0.012 n=24+30)
Revcomp-4                   6.32s ± 1%     6.42s ± 4%     ~     (p=0.342 n=25+30)
Template-4                  868ms ± 6%     878ms ± 6%   +1.15%  (p=0.000 n=30+30)
TimeParse-4                4.57µs ± 4%    4.59µs ± 3%   +0.65%  (p=0.010 n=29+30)
TimeFormat-4               4.51µs ± 0%    4.50µs ± 0%   -0.27%  (p=0.000 n=27+24)
[Geo mean]                  695µs          689µs        -0.92%

name                     old speed      new speed      delta
GobDecode-4              8.19MB/s ± 0%  8.12MB/s ± 4%     ~     (p=0.680 n=24+30)
GobEncode-4              9.76MB/s ± 7%  9.96MB/s ± 0%     ~     (p=0.616 n=30+23)
Gzip-4                   4.84MB/s ± 0%  4.89MB/s ± 4%   +1.16%  (p=0.030 n=24+30)
Gunzip-4                 49.9MB/s ± 4%  50.6MB/s ± 0%     ~     (p=0.162 n=30+23)
JSONEncode-4             10.9MB/s ± 1%  10.7MB/s ± 6%     ~     (p=0.575 n=24+30)
JSONDecode-4             2.30MB/s ± 0%  2.32MB/s ± 5%   +0.72%  (p=0.003 n=22+30)
GoParse-4                1.31MB/s ± 6%  1.34MB/s ± 0%   +2.26%  (p=0.002 n=30+27)
RegexpMatchEasy0_32-4    30.0MB/s ± 6%  30.0MB/s ± 4%     ~     (p=1.000 n=30+30)
RegexpMatchEasy0_1K-4     186MB/s ± 0%   187MB/s ± 0%   +0.35%  (p=0.000 n=23+26)
RegexpMatchEasy1_32-4    31.8MB/s ± 0%  31.5MB/s ± 4%   -0.92%  (p=0.012 n=25+30)
RegexpMatchEasy1_1K-4     138MB/s ± 0%   143MB/s ± 0%   +3.53%  (p=0.000 n=23+24)
RegexpMatchMedium_32-4    560kB/s ± 0%   553kB/s ± 4%   -1.19%  (p=0.005 n=23+30)
RegexpMatchMedium_1K-4   1.87MB/s ± 0%  1.89MB/s ± 3%   +1.04%  (p=0.002 n=24+30)
RegexpMatchHard_32-4     1.05MB/s ± 0%  1.08MB/s ± 0%   +2.40%  (p=0.000 n=19+23)
RegexpMatchHard_1K-4     1.12MB/s ± 0%  1.12MB/s ± 5%   +0.12%  (p=0.006 n=25+30)
Revcomp-4                40.2MB/s ± 1%  39.6MB/s ± 4%     ~     (p=0.242 n=25+30)
Template-4               2.24MB/s ± 6%  2.21MB/s ± 6%   -1.15%  (p=0.000 n=30+30)
[Geo mean]               7.87MB/s       7.91MB/s        +0.44%

Change-Id: If374cb7abf83537aa0a176f73c0f736f7800db03
Reviewed-on: https://go-review.googlesource.com/108735
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-04-27 20:02:05 +00:00
Milan Knezevic
2959128dc5 cmd/compile: add softfloat support to mips64{,le} 
mips64 softfloat support is based on mips implementation and introduces
new enviroment variable GOMIPS64.

GOMIPS64 is a GOARCH=mips64{,le} specific option, for a choice between
hard-float and soft-float. Valid values are 'hardfloat' (default) and
'softfloat'. It is passed to the assembler as
'GOMIPS64_{hardfloat,softfloat}'.

Change-Id: I7f73078627f7cb37c588a38fb5c997fe09c56134
Reviewed-on: https://go-review.googlesource.com/108475
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2018-04-27 14:50:17 +00:00
Josh Bleecher Snyder
d9a50a6531 cmd/compile: use prove pass to detect Ctz of non-zero values 
On amd64, Ctz must include special handling of zeros.
But the prove pass has enough information to detect whether the input
is non-zero, allowing a more efficient lowering.

Introduce new CtzNonZero ops to capture and use this information.

Benchmark code:

func BenchmarkVisitBits(b *testing.B) {
	b.Run("8", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			x := uint8(0xff)
			for x != 0 {
				sink = bits.TrailingZeros8(x)
				x &= x - 1
			}
		}
	})

    // and similarly so for 16, 32, 64
}

name            old time/op  new time/op  delta
VisitBits/8-8   7.27ns ± 4%  5.58ns ± 4%  -23.35%  (p=0.000 n=28+26)
VisitBits/16-8  14.7ns ± 7%  10.5ns ± 4%  -28.43%  (p=0.000 n=30+28)
VisitBits/32-8  27.6ns ± 8%  19.3ns ± 3%  -30.14%  (p=0.000 n=30+26)
VisitBits/64-8  44.0ns ±11%  38.0ns ± 5%  -13.48%  (p=0.000 n=30+30)

Fixes #25077

Change-Id: Ie6e5bd86baf39ee8a4ca7cadcf56d934e047f957
Reviewed-on: https://go-review.googlesource.com/109358
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-26 18:22:28 +00:00
Carlos Eduardo Seo
ebb67d993a cmd/compile, cmd/internal/obj/ppc64: make math.Round an intrinsic on ppc64x 
This change implements math.Round as an intrinsic on ppc64x so it can be
done using a single instruction.

benchmark                   old ns/op     new ns/op     delta
BenchmarkRound-16           2.60          0.69          -73.46%

Change-Id: I9408363e96201abdfc73ced7bcd5f0c29db006a8
Reviewed-on: https://go-review.googlesource.com/109395
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
 2018-04-26 14:12:09 +00:00
Josh Bleecher Snyder
c5f0104daf cmd/compile: use intrinsic for LeadingZeros8 on amd64 
The previous change sped up the pure computation form of LeadingZeros8.
This places it somewhat close to the table lookup form.
Depending on something that varies from toolchain to toolchain
(alignment, perhaps?), the slowdown from ditching the table lookup
is either 20% or 5%.

This benchmark is the best case scenario for the table lookup:
It is in the L1 cache already.

I think we're close enough that we can switch to the computational version,
and trust that the memory effects and binary size savings will be worth it.

Code:

func f8(x uint8)   { z = bits.LeadingZeros8(x) }

Before:

"".f8 STEXT nosplit size=34 args=0x8 locals=0x0
	0x0000 00000 (x.go:7)	TEXT	"".f8(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:7)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:7)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:7)	MOVBLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:7)	MOVBLZX	AL, AX
	0x0008 00008 (x.go:7)	LEAQ	math/bits.len8tab(SB), CX
	0x000f 00015 (x.go:7)	MOVBLZX	(CX)(AX*1), AX
	0x0013 00019 (x.go:7)	ADDQ	$-8, AX
	0x0017 00023 (x.go:7)	NEGQ	AX
	0x001a 00026 (x.go:7)	MOVQ	AX, "".z(SB)
	0x0021 00033 (x.go:7)	RET

After:

"".f8 STEXT nosplit size=30 args=0x8 locals=0x0
	0x0000 00000 (x.go:7)	TEXT	"".f8(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:7)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:7)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:7)	MOVBLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:7)	MOVBLZX	AL, AX
	0x0008 00008 (x.go:7)	LEAL	1(AX)(AX*1), AX
	0x000c 00012 (x.go:7)	BSRL	AX, AX
	0x000f 00015 (x.go:7)	ADDQ	$-8, AX
	0x0013 00019 (x.go:7)	NEGQ	AX
	0x0016 00022 (x.go:7)	MOVQ	AX, "".z(SB)
	0x001d 00029 (x.go:7)	RET

Change-Id: Icc7db50a7820fb9a3da8a816d6b6940d7f8e193e
Reviewed-on: https://go-review.googlesource.com/108942
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-25 21:34:15 +00:00
Josh Bleecher Snyder
1d321ada73 cmd/compile: optimize LeadingZeros(16|32) on amd64 
Introduce Len8 and Len16 ops and provide optimized lowerings for them.
amd64 only for this CL, although it wouldn't surprise me
if other architectures also admit of optimized lowerings.

Also use and optimize the Len32 lowering, along the same lines.

Leave Len8 unused for the moment; a subsequent CL will enable it.

For 16 and 32 bits, this leads to a speed-up.

name              old time/op  new time/op  delta
LeadingZeros16-8  1.42ns ± 5%  1.23ns ± 5%  -13.42%  (p=0.000 n=20+20)
LeadingZeros32-8  1.25ns ± 5%  1.03ns ± 5%  -17.63%  (p=0.000 n=20+16)

Code:

func f16(x uint16) { z = bits.LeadingZeros16(x) }
func f32(x uint32) { z = bits.LeadingZeros32(x) }

Before:

"".f16 STEXT nosplit size=38 args=0x8 locals=0x0
	0x0000 00000 (x.go:8)	TEXT	"".f16(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:8)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:8)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:8)	MOVWLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:8)	MOVWLZX	AX, AX
	0x0008 00008 (x.go:8)	BSRQ	AX, AX
	0x000c 00012 (x.go:8)	MOVQ	$-1, CX
	0x0013 00019 (x.go:8)	CMOVQEQ	CX, AX
	0x0017 00023 (x.go:8)	ADDQ	$-15, AX
	0x001b 00027 (x.go:8)	NEGQ	AX
	0x001e 00030 (x.go:8)	MOVQ	AX, "".z(SB)
	0x0025 00037 (x.go:8)	RET

"".f32 STEXT nosplit size=34 args=0x8 locals=0x0
	0x0000 00000 (x.go:9)	TEXT	"".f32(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:9)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:9)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:9)	MOVL	"".x+8(SP), AX
	0x0004 00004 (x.go:9)	BSRQ	AX, AX
	0x0008 00008 (x.go:9)	MOVQ	$-1, CX
	0x000f 00015 (x.go:9)	CMOVQEQ	CX, AX
	0x0013 00019 (x.go:9)	ADDQ	$-31, AX
	0x0017 00023 (x.go:9)	NEGQ	AX
	0x001a 00026 (x.go:9)	MOVQ	AX, "".z(SB)
	0x0021 00033 (x.go:9)	RET

After:

"".f16 STEXT nosplit size=30 args=0x8 locals=0x0
	0x0000 00000 (x.go:8)	TEXT	"".f16(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:8)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:8)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:8)	MOVWLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:8)	MOVWLZX	AX, AX
	0x0008 00008 (x.go:8)	LEAL	1(AX)(AX*1), AX
	0x000c 00012 (x.go:8)	BSRL	AX, AX
	0x000f 00015 (x.go:8)	ADDQ	$-16, AX
	0x0013 00019 (x.go:8)	NEGQ	AX
	0x0016 00022 (x.go:8)	MOVQ	AX, "".z(SB)
	0x001d 00029 (x.go:8)	RET

"".f32 STEXT nosplit size=28 args=0x8 locals=0x0
	0x0000 00000 (x.go:9)	TEXT	"".f32(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:9)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:9)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:9)	MOVL	"".x+8(SP), AX
	0x0004 00004 (x.go:9)	LEAQ	1(AX)(AX*1), AX
	0x0009 00009 (x.go:9)	BSRQ	AX, AX
	0x000d 00013 (x.go:9)	ADDQ	$-32, AX
	0x0011 00017 (x.go:9)	NEGQ	AX
	0x0014 00020 (x.go:9)	MOVQ	AX, "".z(SB)
	0x001b 00027 (x.go:9)	RET

Change-Id: I6c93c173752a7bfdeab8be30777ae05a736e1f4b
Reviewed-on: https://go-review.googlesource.com/108941
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-25 21:34:04 +00:00
Josh Bleecher Snyder
54dbab5221 cmd/compile: optimize TrailingZeros(8|16) on amd64 
Introduce Ctz8 and Ctz16 ops and provide optimized lowerings for them.
amd64 only for this CL, although it wouldn't surprise me
if other architectures also admit of optimized lowerings.

name               old time/op  new time/op  delta
TrailingZeros8-8   1.33ns ± 6%  0.84ns ± 3%  -36.90%  (p=0.000 n=20+20)
TrailingZeros16-8  1.26ns ± 5%  0.84ns ± 5%  -33.50%  (p=0.000 n=20+18)

Code:

func f8(x uint8)   { z = bits.TrailingZeros8(x) }
func f16(x uint16) { z = bits.TrailingZeros16(x) }

Before:

"".f8 STEXT nosplit size=34 args=0x8 locals=0x0
	0x0000 00000 (x.go:7)	TEXT	"".f8(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:7)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:7)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:7)	MOVBLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:7)	MOVBLZX	AL, AX
	0x0008 00008 (x.go:7)	BTSQ	$8, AX
	0x000d 00013 (x.go:7)	BSFQ	AX, AX
	0x0011 00017 (x.go:7)	MOVL	$64, CX
	0x0016 00022 (x.go:7)	CMOVQEQ	CX, AX
	0x001a 00026 (x.go:7)	MOVQ	AX, "".z(SB)
	0x0021 00033 (x.go:7)	RET

"".f16 STEXT nosplit size=34 args=0x8 locals=0x0
	0x0000 00000 (x.go:8)	TEXT	"".f16(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:8)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:8)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:8)	MOVWLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:8)	MOVWLZX	AX, AX
	0x0008 00008 (x.go:8)	BTSQ	$16, AX
	0x000d 00013 (x.go:8)	BSFQ	AX, AX
	0x0011 00017 (x.go:8)	MOVL	$64, CX
	0x0016 00022 (x.go:8)	CMOVQEQ	CX, AX
	0x001a 00026 (x.go:8)	MOVQ	AX, "".z(SB)
	0x0021 00033 (x.go:8)	RET

After:

"".f8 STEXT nosplit size=20 args=0x8 locals=0x0
	0x0000 00000 (x.go:7)	TEXT	"".f8(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:7)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:7)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:7)	MOVBLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:7)	BTSL	$8, AX
	0x0009 00009 (x.go:7)	BSFL	AX, AX
	0x000c 00012 (x.go:7)	MOVQ	AX, "".z(SB)
	0x0013 00019 (x.go:7)	RET

"".f16 STEXT nosplit size=20 args=0x8 locals=0x0
	0x0000 00000 (x.go:8)	TEXT	"".f16(SB), NOSPLIT, $0-8
	0x0000 00000 (x.go:8)	FUNCDATA	$0, gclocals·2a5305abe05176240e61b8620e19a815(SB)
	0x0000 00000 (x.go:8)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:8)	MOVWLZX	"".x+8(SP), AX
	0x0005 00005 (x.go:8)	BTSL	$16, AX
	0x0009 00009 (x.go:8)	BSFL	AX, AX
	0x000c 00012 (x.go:8)	MOVQ	AX, "".z(SB)
	0x0013 00019 (x.go:8)	RET

Change-Id: I0551e357348de2b724737d569afd6ac9f5c3aa11
Reviewed-on: https://go-review.googlesource.com/108940
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-25 21:33:52 +00:00
Josh Bleecher Snyder
d292f77e95 cmd/compile: rewrite 2*x+c into LEAx1 on amd64 
Rewrite x<<1+c into x+x+c, which can be expressed as a single LEAQ/LEAL.

Bit of a special case, but the single-instruction
LEA is both shorter and faster than SHL then ADD.

Triggers 293 times during make.bash.

Change-Id: I3f09c8e9a8f3859d1eeed336f095fc3ada79c2c1
Reviewed-on: https://go-review.googlesource.com/108938
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-23 22:40:10 +00:00
Ben Shi
34f5f8a580 cmd/compile: optimize ARM64 with register indexed load/store 
ARM64 supports load/store instructions with a memory operand that
the address is calculated by base register + index register.

In this CL,
1. Some rules are added to the compile's ARM64 backend to emit
such efficient instructions.
2. A wrong rule of load combination is fixed.

The go1 benchmark does show improvement.

name                     old time/op    new time/op    delta
BinaryTree17-4              44.5s ± 2%     44.1s ± 1%   -0.81%  (p=0.000 n=28+29)
Fannkuch11-4                32.7s ± 3%     30.5s ± 0%   -6.79%  (p=0.000 n=30+26)
FmtFprintfEmpty-4           499ns ± 0%     506ns ± 5%   +1.39%  (p=0.003 n=25+30)
FmtFprintfString-4         1.07µs ± 0%    1.04µs ± 4%   -3.17%  (p=0.000 n=23+30)
FmtFprintfInt-4            1.15µs ± 4%    1.13µs ± 0%   -1.55%  (p=0.000 n=30+23)
FmtFprintfIntInt-4         1.77µs ± 4%    1.74µs ± 0%   -1.71%  (p=0.000 n=30+24)
FmtFprintfPrefixedInt-4    2.37µs ± 5%    2.12µs ± 0%  -10.56%  (p=0.000 n=30+23)
FmtFprintfFloat-4          3.03µs ± 1%    3.03µs ± 4%   -0.13%  (p=0.003 n=25+30)
FmtManyArgs-4              7.38µs ± 1%    7.43µs ± 4%   +0.59%  (p=0.003 n=25+30)
GobDecode-4                 101ms ± 6%      95ms ± 5%   -5.55%  (p=0.000 n=30+30)
GobEncode-4                78.0ms ± 4%    78.8ms ± 6%   +1.05%  (p=0.000 n=30+30)
Gzip-4                      4.25s ± 0%     4.27s ± 4%   +0.45%  (p=0.003 n=24+30)
Gunzip-4                    428ms ± 1%     420ms ± 0%   -1.88%  (p=0.000 n=23+23)
HTTPClientServer-4          549µs ± 1%     541µs ± 1%   -1.56%  (p=0.000 n=29+29)
JSONEncode-4                194ms ± 0%     188ms ± 4%     ~     (p=0.417 n=23+30)
JSONDecode-4                890ms ± 5%     831ms ± 0%   -6.55%  (p=0.000 n=30+23)
Mandelbrot200-4            47.3ms ± 2%    46.5ms ± 0%     ~     (p=0.980 n=30+26)
GoParse-4                  43.1ms ± 6%    43.8ms ± 6%   +1.65%  (p=0.000 n=30+30)
RegexpMatchEasy0_32-4      1.06µs ± 0%    1.07µs ± 3%     ~     (p=0.092 n=23+30)
RegexpMatchEasy0_1K-4      5.53µs ± 0%    5.51µs ± 0%   -0.24%  (p=0.000 n=25+25)
RegexpMatchEasy1_32-4      1.02µs ± 3%    1.01µs ± 0%   -1.27%  (p=0.000 n=30+24)
RegexpMatchEasy1_1K-4      7.26µs ± 0%    7.33µs ± 0%   +0.95%  (p=0.000 n=23+26)
RegexpMatchMedium_32-4     1.84µs ± 7%    1.79µs ± 1%     ~     (p=0.333 n=30+23)
RegexpMatchMedium_1K-4      553µs ± 0%     547µs ± 0%   -1.14%  (p=0.000 n=24+22)
RegexpMatchHard_32-4       30.8µs ± 1%    30.3µs ± 0%   -1.40%  (p=0.000 n=24+24)
RegexpMatchHard_1K-4        928µs ± 0%     929µs ± 5%   +0.12%  (p=0.013 n=23+30)
Revcomp-4                   8.13s ± 4%     6.32s ± 1%  -22.23%  (p=0.000 n=30+23)
Template-4                  899ms ± 6%     854ms ± 1%   -5.01%  (p=0.000 n=30+24)
TimeParse-4                4.66µs ± 4%    4.59µs ± 1%   -1.57%  (p=0.000 n=30+23)
TimeFormat-4               4.58µs ± 0%    4.61µs ± 0%   +0.57%  (p=0.000 n=26+24)
[Geo mean]                  717µs          698µs        -2.55%

name                     old speed      new speed      delta
GobDecode-4              7.63MB/s ± 6%  8.08MB/s ± 5%   +5.88%  (p=0.000 n=30+30)
GobEncode-4              9.85MB/s ± 4%  9.75MB/s ± 6%   -1.04%  (p=0.000 n=30+30)
Gzip-4                   4.56MB/s ± 0%  4.55MB/s ± 4%   -0.36%  (p=0.003 n=24+30)
Gunzip-4                 45.3MB/s ± 1%  46.2MB/s ± 0%   +1.92%  (p=0.000 n=23+23)
JSONEncode-4             10.0MB/s ± 0%  10.4MB/s ± 4%     ~     (p=0.403 n=23+30)
JSONDecode-4             2.18MB/s ± 5%  2.33MB/s ± 0%   +6.91%  (p=0.000 n=30+23)
GoParse-4                1.34MB/s ± 5%  1.32MB/s ± 5%   -1.66%  (p=0.000 n=30+30)
RegexpMatchEasy0_32-4    30.2MB/s ± 0%  29.8MB/s ± 3%     ~     (p=0.099 n=23+30)
RegexpMatchEasy0_1K-4     185MB/s ± 0%   186MB/s ± 0%   +0.24%  (p=0.000 n=25+25)
RegexpMatchEasy1_32-4    31.4MB/s ± 3%  31.8MB/s ± 0%   +1.24%  (p=0.000 n=30+24)
RegexpMatchEasy1_1K-4     141MB/s ± 0%   140MB/s ± 0%   -0.94%  (p=0.000 n=23+26)
RegexpMatchMedium_32-4    541kB/s ± 6%   560kB/s ± 0%   +3.45%  (p=0.000 n=30+23)
RegexpMatchMedium_1K-4   1.85MB/s ± 0%  1.87MB/s ± 0%   +1.08%  (p=0.000 n=24+23)
RegexpMatchHard_32-4     1.04MB/s ± 1%  1.06MB/s ± 1%   +1.48%  (p=0.000 n=24+24)
RegexpMatchHard_1K-4     1.10MB/s ± 0%  1.10MB/s ± 5%   +0.15%  (p=0.004 n=23+30)
Revcomp-4                31.3MB/s ± 4%  40.2MB/s ± 1%  +28.52%  (p=0.000 n=30+23)
Template-4               2.16MB/s ± 6%  2.27MB/s ± 1%   +5.18%  (p=0.000 n=30+24)
[Geo mean]               7.57MB/s       7.79MB/s        +2.98%

fixes #24907

Change-Id: I94afd0e3f53d62a1cf5e452f3dd6daf61be21785
Reviewed-on: https://go-review.googlesource.com/107376
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
 2018-04-19 15:08:10 +00:00
Michael Munday
58cdecb9c8 cmd/compile: generate constants for NeqPtr, EqPtr and IsNonNil ops 
If both inputs are constant offsets from the same pointer then we
can evaluate NeqPtr and EqPtr at compile time. Triggers a few times
during all.bash. Removes a conditional branch in the following
code:

copy(x[1:], x[:])

This branch was recently added as an optimization in CL 94596. We
now skip the memmove if the pointers are equal. However, in the
above code we know at compile time that they are never equal.

Also, when the offset is variable, check if the offset is zero
rather than if the pointers are equal. For example:

copy(x[a:], x[:])

This would now skip the copy if a == 0, rather than if x + a == x.

Finally I've also added a rule to make IsNonNil true for pointers
to values on the stack. The nil check elimination pass will catch
these anyway, but eliminating them here might eliminate branches
earlier.

Change-Id: If72f436fef0a96ad0f4e296d3a1f8b6c3e712085
Reviewed-on: https://go-review.googlesource.com/106635
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-16 20:43:57 +00:00
Ben Shi
cd65bbc01b cmd/compile/internal/ssa: optimize 386's subtraction 
The SUBL instruction can take a memory operand, and this CL
implements this optimization.

The go1 benchmark shows a little improvement.

name                     old time/op    new time/op    delta
BinaryTree17-4              3.27s ± 2%     3.29s ± 3%    ~     (p=0.322 n=37+40)
Fannkuch11-4                3.49s ± 0%     3.53s ± 1%  +1.21%  (p=0.000 n=31+40)
FmtFprintfEmpty-4          46.2ns ± 3%    46.3ns ± 2%    ~     (p=0.351 n=40+28)
FmtFprintfString-4         82.0ns ± 3%    81.5ns ± 2%  -0.69%  (p=0.002 n=40+30)
FmtFprintfInt-4            94.6ns ± 3%    94.6ns ± 6%    ~     (p=0.913 n=39+37)
FmtFprintfIntInt-4          147ns ± 3%     150ns ± 2%  +1.72%  (p=0.000 n=40+25)
FmtFprintfPrefixedInt-4     186ns ± 3%     186ns ± 0%  -0.33%  (p=0.006 n=40+25)
FmtFprintfFloat-4           388ns ± 4%     388ns ± 4%    ~     (p=0.162 n=40+40)
FmtManyArgs-4               612ns ± 3%     616ns ± 4%    ~     (p=0.223 n=40+40)
GobDecode-4                7.35ms ± 5%    7.42ms ± 5%    ~     (p=0.095 n=40+40)
GobEncode-4                7.21ms ± 8%    7.23ms ± 4%    ~     (p=0.294 n=40+40)
Gzip-4                      360ms ± 4%     359ms ± 4%    ~     (p=0.097 n=40+40)
Gunzip-4                   46.1ms ± 3%    45.6ms ± 3%  -1.20%  (p=0.000 n=40+40)
HTTPClientServer-4         64.0µs ± 2%    64.1µs ± 2%    ~     (p=0.648 n=39+40)
JSONEncode-4               21.9ms ± 4%    22.1ms ± 5%    ~     (p=0.086 n=40+40)
JSONDecode-4               67.9ms ± 4%    66.7ms ± 4%  -1.63%  (p=0.000 n=40+40)
Mandelbrot200-4            5.19ms ± 3%    5.17ms ± 3%    ~     (p=0.881 n=40+40)
GoParse-4                  3.34ms ± 3%    3.28ms ± 2%  -1.78%  (p=0.000 n=40+40)
RegexpMatchEasy0_32-4       101ns ± 5%      99ns ± 3%  -2.40%  (p=0.000 n=40+40)
RegexpMatchEasy0_1K-4       851ns ± 1%     848ns ± 3%  -0.36%  (p=0.004 n=33+40)
RegexpMatchEasy1_32-4       109ns ± 5%     105ns ± 3%  -3.53%  (p=0.000 n=39+40)
RegexpMatchEasy1_1K-4      1.03µs ± 4%    1.03µs ± 3%    ~     (p=0.638 n=40+38)
RegexpMatchMedium_32-4      131ns ± 5%     127ns ± 4%  -3.36%  (p=0.000 n=38+40)
RegexpMatchMedium_1K-4     43.4µs ± 4%    43.2µs ± 3%  -0.46%  (p=0.008 n=40+40)
RegexpMatchHard_32-4       2.21µs ± 4%    2.23µs ± 1%  +0.77%  (p=0.014 n=40+28)
RegexpMatchHard_1K-4       67.6µs ± 4%    67.7µs ± 3%  +0.11%  (p=0.016 n=40+40)
Revcomp-4                   1.86s ± 3%     1.77s ± 2%  -4.81%  (p=0.000 n=40+40)
Template-4                 71.7ms ± 3%    71.6ms ± 4%    ~     (p=0.200 n=40+40)
TimeParse-4                 436ns ± 4%     433ns ± 3%    ~     (p=0.358 n=40+40)
TimeFormat-4                413ns ± 4%     412ns ± 3%    ~     (p=0.415 n=40+40)
[Geo mean]                 63.9µs         63.6µs       -0.49%

name                     old speed      new speed      delta
GobDecode-4               105MB/s ± 5%   104MB/s ± 5%    ~     (p=0.096 n=40+40)
GobEncode-4               106MB/s ± 7%   106MB/s ± 3%    ~     (p=0.385 n=39+40)
Gzip-4                   54.0MB/s ± 4%  54.0MB/s ± 4%    ~     (p=0.100 n=40+40)
Gunzip-4                  421MB/s ± 3%   426MB/s ± 3%  +1.21%  (p=0.000 n=40+40)
JSONEncode-4             88.5MB/s ± 5%  88.0MB/s ± 5%    ~     (p=0.083 n=40+40)
JSONDecode-4             28.6MB/s ± 4%  29.1MB/s ± 4%  +1.65%  (p=0.000 n=40+40)
GoParse-4                17.3MB/s ± 3%  17.7MB/s ± 2%  +1.82%  (p=0.000 n=40+40)
RegexpMatchEasy0_32-4     316MB/s ± 5%   323MB/s ± 4%  +2.44%  (p=0.000 n=40+40)
RegexpMatchEasy0_1K-4    1.20GB/s ± 1%  1.21GB/s ± 3%  +0.40%  (p=0.004 n=33+40)
RegexpMatchEasy1_32-4     291MB/s ± 7%   302MB/s ± 4%  +3.82%  (p=0.000 n=40+40)
RegexpMatchEasy1_1K-4     993MB/s ± 4%   990MB/s ± 3%    ~     (p=0.623 n=40+38)
RegexpMatchMedium_32-4   7.61MB/s ± 5%  7.87MB/s ± 4%  +3.36%  (p=0.000 n=38+40)
RegexpMatchMedium_1K-4   23.6MB/s ± 4%  23.7MB/s ± 4%  +0.46%  (p=0.007 n=40+40)
RegexpMatchHard_32-4     14.5MB/s ± 4%  14.3MB/s ± 1%  -0.79%  (p=0.017 n=40+28)
RegexpMatchHard_1K-4     15.1MB/s ± 4%  15.1MB/s ± 3%  -0.11%  (p=0.015 n=40+40)
Revcomp-4                 137MB/s ± 3%   144MB/s ± 3%  +5.06%  (p=0.000 n=40+40)
Template-4               27.1MB/s ± 3%  27.1MB/s ± 4%    ~     (p=0.211 n=40+40)
[Geo mean]               78.9MB/s       79.7MB/s       +1.01%

Change-Id: I638fa4fef85833e8605919d693f9570cc3cf7334
Reviewed-on: https://go-review.googlesource.com/107275
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-16 04:41:20 +00:00
Giovanni Bajo
e7b1d0a9cf test: add missing copyright header 
Change-Id: Ia64535492515f725fe3c4b59ea300363a0c4ce10
Reviewed-on: https://go-review.googlesource.com/107136
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-04-15 21:17:54 +00:00
Giovanni Bajo
284ba47b49 test: run codegen tests on all supported architecture variants 
This CL makes the codegen testsuite automatically test all
architecture variants for architecture specified in tests. For
instance, if a test file specifies a "arm" test, it will be
automatically run on all GOARM variants (5,6,7), to increase
the coverage.

The CL also introduces a syntax to specify only a specific
variant (eg: "arm/7") in case the test makes sense only there.
The same syntax also allows to specify the operating system
in case it matters (eg: "plan9/386/sse2").

Fixes #24658

Change-Id: I2eba8b918f51bb6a77a8431a309f8b71af07ea22
Reviewed-on: https://go-review.googlesource.com/107315
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-04-15 20:02:43 +00:00
Giovanni Bajo
01aa1d7dbe test: migrate plan9 tests to codegen 
And remove it from asmtest. Next CL will remove the whole
asmtest infrastructure.

Change-Id: I5851bf7c617456d62a3c6cffacf70252df7b056b
Reviewed-on: https://go-review.googlesource.com/107335
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-04-15 20:02:30 +00:00
Alberto Donizetti
467eca6076 test/codegen: port last stack and memcombining tests 
And delete them from asm_test.

Also delete an arm64 cmov test has been already ported to the new test
harness.

Change-Id: I4458721e1f512bc9ecbbe1c22a2c9c7109ad68fe
Reviewed-on: https://go-review.googlesource.com/106335
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
 2018-04-11 16:08:04 +00:00
Alberto Donizetti
188e2bf897 test/codegen: port arm64 BIC/EON/ORN and masking tests 
And delete them from asm_test.

Change-Id: I24f421b87e8cb4770c887a6dfd58eacd0088947d
Reviewed-on: https://go-review.googlesource.com/106056
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-10 10:57:50 +00:00
Alberto Donizetti
d5ff631e6b test/codegen: port last remaining misc bit/arithmetic tests 
And delete them from asm_test.

Change-Id: I9a75efe9858ef9d7ac86065f860c2ae3f25b0941
Reviewed-on: https://go-review.googlesource.com/105597
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
 2018-04-10 07:58:35 +00:00
Michael Munday
b65122f99a cmd/compile: optimize comparisons using load merging where available 
Multi-byte comparison operations were used on amd64, arm64, i386
and s390x for comparisons with constant arrays, but only amd64 and
i386 for comparisons with string constants. This CL combines the
check for platform capability, since they have the same requirements,
and also enables both on ppc64le which also supports load merging.

Note that these optimizations currently use little endian byte order
which results in byte reversal instructions on s390x. This should
be fixed at some point.

Change-Id: Ie612d13359b50c77f4d7c6e73fea4a59fa11f322
Reviewed-on: https://go-review.googlesource.com/102558
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2018-04-09 21:16:47 +00:00
Alberto Donizetti
54c3f56ee0 test/codegen: port various mem-combining tests 
And delete them from asm_test.

Change-Id: I0e33d58274951ab5acb67b0117b60ef617ea887a
Reviewed-on: https://go-review.googlesource.com/105735
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
 2018-04-09 12:00:06 +00:00