Inline atomic reads and writes on amd64. There's no reason
to pay the overhead of a call for these.
To keep atomic loads from being reordered, we make them
return a <value,memory> tuple.
Change the meaning of resultInArg0 for tuple-generating ops
to mean the first part of the result tuple, not the second.
This means we can always put the store part of the tuple last,
matching how arguments are laid out. This requires reordering
the outputs of add32carry and sub32carry and their descendents
in various architectures.
benchmark old ns/op new ns/op delta
BenchmarkAtomicLoad64-8 2.09 0.26 -87.56%
BenchmarkAtomicStore64-8 7.54 5.72 -24.14%
TBD (in a different CL): Cas, Or8, ...
Change-Id: I713ea88e7da3026c44ea5bdb56ed094b20bc5207
Reviewed-on: https://go-review.googlesource.com/27641
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Add missing function prototypes.
Fix function prototypes.
Use FP references instead of SP references.
Fix variable names.
Update comments.
Clean up whitespace. (Not for vet.)
All fairly minor fixes to make vet happy.
Updates #11041
Change-Id: Ifab2cdf235ff61cdc226ab1d84b8467b5ac9446c
Reviewed-on: https://go-review.googlesource.com/27713
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Factor out the regular file handling logic into handleRegularFile
from nextHeader. We will need to reuse this logic when fixing #15573
in a future CL.
Factor out the sparse file handling logic into handleSparseFile.
Currently this logic is split between nextHeader (for GNU sparse
files) and Next (for PAX sparse files). Instead, we move this
related code into a single method.
There is no overall logic change. Thus, no unit tests.
Updates #15573#15564
Change-Id: I3b8270d8b4e080e77d6c0df6a123d677c82cc466
Reviewed-on: https://go-review.googlesource.com/27454
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
RFC 7233, section 4.4 says:
>>>
For byte ranges, failing to overlap the current extent means that the
first-byte-pos of all of the byte-range-spec values were greater than the
current length of the selected representation. When this status code is
generated in response to a byte-range request, the sender SHOULD generate a
Content-Range header field specifying the current length of the selected
representation
<<<
Thus, we should send the Content-Range only if none of the ranges
overlap.
Fixes#15798.
Change-Id: Ic9a3e1b3a8730398b4bdff877a8f2fd2e30149e3
Reviewed-on: https://go-review.googlesource.com/24212
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This CL reworks walkcompare for clarity and concision.
It also makes one significant functional change.
(The functional change is hard to separate cleanly
from the cleanup, so I just did them together.)
When inlining and unrolling an equality comparison
for a small struct or array, compare the elements like:
a[0] == b[0] && a[1] == b[1]
rather than
pa := &a
pb := &b
pa[0] == pb[0] && pa[1] == pb[1]
The result is the same, but taking the address
and working through the indirect
forces the backends to generate less efficient code.
This is only an improvement with the SSA backend.
However, every port but s390x now has a working
SSA backend, and switching to the SSA backend
by default everywhere is a priority for Go 1.8.
It thus seems reasonable to start to prioritize
SSA performance over the old backend.
Updates #15303
Sample code:
type T struct {
a, b int8
}
func g(a T) bool {
return a == T{1, 2}
}
SSA before:
"".g t=1 size=80 args=0x10 locals=0x8
0x0000 00000 (badeq.go:7) TEXT "".g(SB), $8-16
0x0000 00000 (badeq.go:7) SUBQ $8, SP
0x0004 00004 (badeq.go:7) FUNCDATA $0, gclocals·23e8278e2b69a3a75fa59b23c49ed6ad(SB)
0x0004 00004 (badeq.go:7) FUNCDATA $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
0x0004 00004 (badeq.go:8) MOVBLZX "".a+16(FP), AX
0x0009 00009 (badeq.go:8) MOVB AL, "".autotmp_0+6(SP)
0x000d 00013 (badeq.go:8) MOVBLZX "".a+17(FP), AX
0x0012 00018 (badeq.go:8) MOVB AL, "".autotmp_0+7(SP)
0x0016 00022 (badeq.go:8) MOVB $0, "".autotmp_1+4(SP)
0x001b 00027 (badeq.go:8) MOVB $1, "".autotmp_1+4(SP)
0x0020 00032 (badeq.go:8) MOVB $2, "".autotmp_1+5(SP)
0x0025 00037 (badeq.go:8) MOVBLZX "".autotmp_0+6(SP), AX
0x002a 00042 (badeq.go:8) MOVBLZX "".autotmp_1+4(SP), CX
0x002f 00047 (badeq.go:8) CMPB AL, CL
0x0031 00049 (badeq.go:8) JNE 70
0x0033 00051 (badeq.go:8) MOVBLZX "".autotmp_0+7(SP), AX
0x0038 00056 (badeq.go:8) CMPB AL, $2
0x003a 00058 (badeq.go:8) SETEQ AL
0x003d 00061 (badeq.go:8) MOVB AL, "".~r1+24(FP)
0x0041 00065 (badeq.go:8) ADDQ $8, SP
0x0045 00069 (badeq.go:8) RET
0x0046 00070 (badeq.go:8) MOVB $0, AL
0x0048 00072 (badeq.go:8) JMP 61
SSA after:
"".g t=1 size=32 args=0x10 locals=0x0
0x0000 00000 (badeq.go:7) TEXT "".g(SB), $0-16
0x0000 00000 (badeq.go:7) NOP
0x0000 00000 (badeq.go:7) NOP
0x0000 00000 (badeq.go:7) FUNCDATA $0, gclocals·23e8278e2b69a3a75fa59b23c49ed6ad(SB)
0x0000 00000 (badeq.go:7) FUNCDATA $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
0x0000 00000 (badeq.go:8) MOVBLZX "".a+8(FP), AX
0x0005 00005 (badeq.go:8) CMPB AL, $1
0x0007 00007 (badeq.go:8) JNE 25
0x0009 00009 (badeq.go:8) MOVBLZX "".a+9(FP), CX
0x000e 00014 (badeq.go:8) CMPB CL, $2
0x0011 00017 (badeq.go:8) SETEQ AL
0x0014 00020 (badeq.go:8) MOVB AL, "".~r1+16(FP)
0x0018 00024 (badeq.go:8) RET
0x0019 00025 (badeq.go:8) MOVB $0, AL
0x001b 00027 (badeq.go:8) JMP 20
Change-Id: I120185d58012b7bbcdb1ec01225b5b08d0855d86
Reviewed-on: https://go-review.googlesource.com/22277
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
If the walker function called on a top-level file returns SkipDir,
then (before this change) Walk would return SkipDir, which the
documentation implies will not happen.
Fixes#16280.
Change-Id: I37d63bdcef7af4b56e342b624cf0d4b42e65c297
Reviewed-on: https://go-review.googlesource.com/24780
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Recreated original favicon with svg. Note, the rasterizations are hand
tweaked for crispness and straight export will not give the same results.
Fixes#6938
Change-Id: I9bf7b59028711361c29365b145932d90af419b69
Reviewed-on: https://go-review.googlesource.com/26850
Reviewed-by: Chris Broadfoot <cbro@golang.org>
- implement *, /, %, shifts, Zero, Move.
- fix mistakes in comparison.
- fix floating point rounding.
- handle RetJmp in assembler (which was not handled, as a consequence
Duff's device was disabled in the old backend.)
all.bash now passes with SSA on.
Updates #16359.
Change-Id: Ia14eed0ed1176b5d800592080c8f53dded7fe73f
Reviewed-on: https://go-review.googlesource.com/27592
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The type sigtabtt was introduced by an automated tool in
https://golang.org/cl/167550043. It was the Go version of the C type
SigTab. However, when the C code using SigTab was converted to Go in
https://golang.org/cl/168500044 it was rewritten to use a different Go
type, sigTabT, rather than sigtabtt (the difference being that sigTabT
uses string where sigtabtt uses *int8 from the C type char*). So this is
just a dreg from the conversion that was never actually used.
Change-Id: I2ec6eb4b25613bf5e5ad1dbba1f4b5ff20f80f55
Reviewed-on: https://go-review.googlesource.com/27691
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Replace the various calls to Fprintf(ctxt.Bso, ...) with a helper,
ctxt.Logf. This also addresses the various inconsistent flushing of
ctxt.Bso.
Because we have two Link structures, add Link.Logf in both places.
Change-Id: I23093f9b9b3bf33089a0ffd7f815f92dcd1a1fa1
Reviewed-on: https://go-review.googlesource.com/27730
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This change moves the ld.Cpos function to a method on coutbuf. This is
part of a larger change that makes ld.outbuf look more like a bio.Buf in
an effort to eventually replace the former with the latter.
Change-Id: I506f7131935a2aa903fa302a0fab0c5be50220fd
Reviewed-on: https://go-review.googlesource.com/27578
Run-TryBot: Dave Cheney <dave@cheney.net>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This should improve the precision of time.now() from microseconds
to nanoseconds.
Also, modify runtime.nanotime to keep it consistent with cleanup
done to time.now.
Updates #11222 for s390x.
Change-Id: I27864115ea1fee7299360d9003cd3a8355f624d3
Reviewed-on: https://go-review.googlesource.com/27710
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
In many places where ctx.Bso.Flush is used as the target for some debug
logging, ctx.Bso.Flush is called unconditionally. In the majority of
cases where debug logging is not enabled, this means Flush is called
many times when there is nothing to be flushed (it will be called anyway
when ctx.Bso is eventually closed), sometimes in a loop.
Avoid this by moving the ctx.Bso.Flush call into the same condition
block as the debug print. This pattern was previously applied
sporadically.
Change-Id: I0444cb235cc8b9bac51a59b2e44e59872db2be06
Reviewed-on: https://go-review.googlesource.com/27579
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Extract "cgo -dynimport" and "ld -r" logic into separate helper
methods to make (*builder).cgo somewhat more manageable.
Fixes#16650.
Change-Id: I3e4d77ff3791528b1233467060d3ea83cb854acb
Reviewed-on: https://go-review.googlesource.com/27270
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Prior to this CL, cmd/go invoked cmd/asm once
for every assembly file.
The exec and cmd/asm startup overhead dwarfed
the actual time spent assembling.
This CL adds support to cmd/asm to process
multiple input files and uses it in cmd/go.
This cuts 10% off the wall time for 'go build -a math'.
Fixes#15680
Change-Id: I12d2ee2c817207954961dc8f37b8f2b09f835550
Reviewed-on: https://go-review.googlesource.com/27636
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This increases the effectiveness of the
"integer-in-range" CL that follows.
Change-Id: I23b7b6809f0b2c25ed1d59dd2d5429c30f1db89c
Reviewed-on: https://go-review.googlesource.com/27651
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The enumerations didn't include the syntactic form where the lhs is
full variable declaration with type specification, as in:
var x, ok T = ...
Fixes#15782.
Change-Id: I0f7bafc37dc9dcf62cdb0894a0d157074ccd4b3e
Reviewed-on: https://go-review.googlesource.com/27670
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Functionality is present in bimport.go in slightly modified form.
Change-Id: I6be79d91588873e6ba70d6ab07ba2caa12346dfc
Reviewed-on: https://go-review.googlesource.com/27672
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Update goobj reader so it can provide all the information
necessary to disassemble .o (and .a) files.
Grab architecture of .o files from header.
.o files have relocations in them. This CL also contains a simple
mechanism to disassemble relocations and add relocation info as an extra
column in the output.
Fixes#13862
Change-Id: I608fd253ff1522ea47f18be650b38d528dae9054
Reviewed-on: https://go-review.googlesource.com/24818
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The net package sets a finalizer on *netFD. I looked through all the
uses of *netFD in the package, looking for each case where a *netFD
was passed as an argument and the final reference to the argument was
not a function or method call. I added a call to runtime.KeepAlive after
each such final reference (there were only three).
The code is safe today without the KeepAlive calls because the compiler
keeps arguments alive for the duration of the function. However, that is
not a language requirement, so adding the KeepAlive calls ensures that
this code remains safe even if the compiler changes in the future.
Change-Id: I4e2bd7c5a946035dc509ccefb4828f72335a9ee3
Reviewed-on: https://go-review.googlesource.com/27650
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The os package sets a finalizer on *Process. I looked through all the
uses of *Process in the package, looking for each case where a *Process
was passed as an argument and the final reference to the argument was
not a function or method call. I added a call to runtime.KeepAlive after
each such final reference (there were only three).
The code is safe today without the KeepAlive calls because the compiler
keeps arguments alive for the duration of the function. However, that is
not a language requirement, so adding the KeepAlive calls ensures that
this code remains safe even if the compiler changes in the future.
I also removed an existing unnecessry call to runtime.KeepAlive. The
syscall.Syscall function is handled specially by the compiler to keep
its arguments alive.
Change-Id: Ibd2ff20b31ed3de4f6a59dd1633c1b44001d91d9
Reviewed-on: https://go-review.googlesource.com/27637
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Updates the behavior of `go get` to return exit status 0 when a
requested package only contains test files.
Fixes#15093
Change-Id: I76b80517d58748090f5e8c6f41178361e2d7ca54
Reviewed-on: https://go-review.googlesource.com/23314
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Now that we have ops that can return 2 results, have BSF return a result
and flags. We can then get rid of the redundant comparison and use CMOV
instead of CMOVconst ops.
Get rid of a bunch of the ops we don't use. Ctz{8,16}, plus all the Clzs,
and CMOVNEs. I don't think we'll ever use them, and they would be easy
to add back if needed.
Change-Id: I8858a1d017903474ea7e4002fc76a6a86e7bd487
Reviewed-on: https://go-review.googlesource.com/27630
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Blank struct fields are regular unexported fields. Two
blank fields are different if they are from different
packages. In order to correctly differentiate them, the
compiler needs the package information. Add it to the
export data.
Fixes#15514.
Change-Id: I421aaca22b542fcd0d66b2d2db777249cad78df6
Reviewed-on: https://go-review.googlesource.com/27639
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The only previous mention of this property was in the String() method.
Since this is the only way to uniquely identify a type and we can't
change this property without breaking the Go 1 guarantee, it seems
better to document this property than hiding it on a method.
Fixes#16348
Change-Id: I3d25f7d6e6007e3c15c2e13010869888d0181fc2
Reviewed-on: https://go-review.googlesource.com/27170
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Change-Id: I4faf9a55414e217f0c48528efb13ab8fdcd9bb16
Reviewed-on: https://go-review.googlesource.com/24845
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Add a type conversion to uintptr for untyped constants
before the conversion to unsafe.Pointer.
Fixes#16317
Change-Id: Ib85feccad1019e687e7eb6135890b64b82fb87fb
Reviewed-on: https://go-review.googlesource.com/27441
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Some FmtSharp export formatting flag support was removed with
commit b4e9f70. Don't panic if FmtSharp is set, just ignore it.
Fixes#16820.
Change-Id: Ie0c3d3774bd55002f6d2781b1212d070f083e6b2
Reviewed-on: https://go-review.googlesource.com/27556
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
If a program wants to evaluate math.Sqrt for any constant value
(for example, math.Sqrt(3)), we can replace that expression with
its evaluation (1.7320508075688772) at compile time, instead of
generating a SQRT assembly command or equivalent.
Adds tests that math.Sqrt generates the correct values. I also
compiled a short program and verified that the Sqrt expression was
replaced by a constant value in the "after opt" step.
Adds a short doc to the top of generic.rules explaining what the file
does and how other files interact with it.
Fixes#15543.
Change-Id: I6b6e63ac61cec50763a09ba581024adeee03d4fa
Reviewed-on: https://go-review.googlesource.com/27457
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Tell msan that the arguments to the traceback functions are initialized,
in case the traceback functions are compiled with -fsanitize=memory.
Change-Id: I3ab0816604906c6cd7086245e6ae2e7fa62fe354
Reviewed-on: https://go-review.googlesource.com/24856
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
I've also unexported a few symbols that weren't used outside the
package.
Updates #16818
Change-Id: I39d9d87b3eec30b88b4a17c1333cfbbfa6b3518f
Reviewed-on: https://go-review.googlesource.com/27468
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Otherwise flag.PrintDefaults will fail when it tries to determine
whether the default is the zero value.
Fixes#16694.
Change-Id: I253fbf11ffc0a9069fd48c2c3cf3074df53e3a03
Reviewed-on: https://go-review.googlesource.com/27003
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The optional fractional seconds overrides any range error
from the second parsing. Instead don't look for optional fractional
seconds if a range error has occured.
Change-Id: I27e0a2432740f6753668bd8833e48b9495bc4036
Reviewed-on: https://go-review.googlesource.com/27590
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
