mirror of
https://github.com/golang/go
synced 2024-11-23 22:40:04 -07:00
ddc7d2a80c
Usually optimization rules have corresponding priorities, some need to
be run first, some run next, and some run last, which produces the best
code. But currently our optimization rules have no priority, this CL
adds a late lower pass that runs those rules that need to be run at last,
such as split unreasonable constant folding. This pass can be seen as
the second round of the lower pass.
For example:
func foo(a, b uint64) uint64 {
d := a+0x1234568
d1 := b+0x1234568
return d&d1
}
The code generated by the master branch:
0x0004 00004 ADD $19088744, R0, R2 // movz+movk+add
0x0010 00016 ADD $19088744, R1, R1 // movz+movk+add
0x001c 00028 AND R1, R2, R0
This is because the current constant folding optimization rules do not
take into account the range of constants, causing the constant to be
loaded repeatedly. This CL splits these unreasonable constants folding
in the late lower pass. With this CL the generated code:
0x0004 00004 MOVD $19088744, R2 // movz+movk
0x000c 00012 ADD R0, R2, R3
0x0010 00016 ADD R1, R2, R1
0x0014 00020 AND R1, R3, R0
This CL also adds constant folding optimization for ADDS instruction.
In addition, in order not to introduce the codegen regression, an
optimization rule is added to change the addition of a negative number
into a subtraction of a positive number.
go1 benchmarks:
name old time/op new time/op delta
BinaryTree17-8 1.22s ± 1% 1.24s ± 0% +1.56% (p=0.008 n=5+5)
Fannkuch11-8 1.54s ± 0% 1.53s ± 0% -0.69% (p=0.016 n=4+5)
FmtFprintfEmpty-8 14.1ns ± 0% 14.1ns ± 0% ~ (p=0.079 n=4+5)
FmtFprintfString-8 26.0ns ± 0% 26.1ns ± 0% +0.23% (p=0.008 n=5+5)
FmtFprintfInt-8 32.3ns ± 0% 32.9ns ± 1% +1.72% (p=0.008 n=5+5)
FmtFprintfIntInt-8 54.5ns ± 0% 55.5ns ± 0% +1.83% (p=0.008 n=5+5)
FmtFprintfPrefixedInt-8 61.5ns ± 0% 62.0ns ± 0% +0.93% (p=0.008 n=5+5)
FmtFprintfFloat-8 72.0ns ± 0% 73.6ns ± 0% +2.24% (p=0.008 n=5+5)
FmtManyArgs-8 221ns ± 0% 224ns ± 0% +1.22% (p=0.008 n=5+5)
GobDecode-8 1.91ms ± 0% 1.93ms ± 0% +0.98% (p=0.008 n=5+5)
GobEncode-8 1.40ms ± 1% 1.39ms ± 0% -0.79% (p=0.032 n=5+5)
Gzip-8 115ms ± 0% 117ms ± 1% +1.17% (p=0.008 n=5+5)
Gunzip-8 19.4ms ± 1% 19.3ms ± 0% -0.71% (p=0.016 n=5+4)
HTTPClientServer-8 27.0µs ± 0% 27.3µs ± 0% +0.80% (p=0.008 n=5+5)
JSONEncode-8 3.36ms ± 1% 3.33ms ± 0% ~ (p=0.056 n=5+5)
JSONDecode-8 17.5ms ± 2% 17.8ms ± 0% +1.71% (p=0.016 n=5+4)
Mandelbrot200-8 2.29ms ± 0% 2.29ms ± 0% ~ (p=0.151 n=5+5)
GoParse-8 1.35ms ± 1% 1.36ms ± 1% ~ (p=0.056 n=5+5)
RegexpMatchEasy0_32-8 24.5ns ± 0% 24.5ns ± 0% ~ (p=0.444 n=4+5)
RegexpMatchEasy0_1K-8 131ns ±11% 118ns ± 6% ~ (p=0.056 n=5+5)
RegexpMatchEasy1_32-8 22.9ns ± 0% 22.9ns ± 0% ~ (p=0.905 n=4+5)
RegexpMatchEasy1_1K-8 126ns ± 0% 127ns ± 0% ~ (p=0.063 n=4+5)
RegexpMatchMedium_32-8 486ns ± 5% 483ns ± 0% ~ (p=0.381 n=5+4)
RegexpMatchMedium_1K-8 15.4µs ± 1% 15.5µs ± 0% ~ (p=0.151 n=5+5)
RegexpMatchHard_32-8 687ns ± 0% 686ns ± 0% ~ (p=0.103 n=5+5)
RegexpMatchHard_1K-8 20.7µs ± 0% 20.7µs ± 1% ~ (p=0.151 n=5+5)
Revcomp-8 175ms ± 2% 176ms ± 3% ~ (p=1.000 n=5+5)
Template-8 20.4ms ± 6% 20.1ms ± 2% ~ (p=0.151 n=5+5)
TimeParse-8 112ns ± 0% 113ns ± 0% +0.97% (p=0.016 n=5+4)
TimeFormat-8 156ns ± 0% 145ns ± 0% -7.14% (p=0.029 n=4+4)
Change-Id: I3ced26e89041f873ac989586514ccc5ee09f13da
Reviewed-on: https://go-review.googlesource.com/c/go/+/425134
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Eric Fang <eric.fang@arm.com>
377 lines
6.2 KiB
Go
377 lines
6.2 KiB
Go
// asmcheck
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package codegen
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import "math/bits"
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/************************************
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* 64-bit instructions
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************************************/
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func bitcheck64_constleft(a uint64) (n int) {
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// amd64:"BTQ\t[$]63"
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if a&(1<<63) != 0 {
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return 1
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}
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// amd64:"BTQ\t[$]60"
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if a&(1<<60) != 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if a&(1<<0) != 0 {
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return 1
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}
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return 0
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}
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func bitcheck64_constright(a [8]uint64) (n int) {
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// amd64:"BTQ\t[$]63"
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if (a[0]>>63)&1 != 0 {
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return 1
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}
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// amd64:"BTQ\t[$]63"
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if a[1]>>63 != 0 {
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return 1
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}
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// amd64:"BTQ\t[$]63"
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if a[2]>>63 == 0 {
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return 1
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}
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// amd64:"BTQ\t[$]60"
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if (a[3]>>60)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]1"
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if (a[4]>>1)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if (a[5]>>0)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]7"
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if (a[6]>>5)&4 == 0 {
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return 1
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}
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return 0
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}
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func bitcheck64_var(a, b uint64) (n int) {
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// amd64:"BTQ"
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if a&(1<<(b&63)) != 0 {
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return 1
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}
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// amd64:"BTQ",-"BT.\t[$]0"
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if (b>>(a&63))&1 != 0 {
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return 1
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}
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return 0
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}
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func bitcheck64_mask(a uint64) (n int) {
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// amd64:"BTQ\t[$]63"
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if a&0x8000000000000000 != 0 {
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return 1
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}
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// amd64:"BTQ\t[$]59"
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if a&0x800000000000000 != 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if a&0x1 != 0 {
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return 1
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}
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return 0
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}
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func biton64(a, b uint64) (n uint64) {
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// amd64:"BTSQ"
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n += b | (1 << (a & 63))
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// amd64:"BTSQ\t[$]63"
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n += a | (1 << 63)
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// amd64:"BTSQ\t[$]60"
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n += a | (1 << 60)
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// amd64:"ORQ\t[$]1"
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n += a | (1 << 0)
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return n
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}
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func bitoff64(a, b uint64) (n uint64) {
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// amd64:"BTRQ"
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n += b &^ (1 << (a & 63))
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// amd64:"BTRQ\t[$]63"
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n += a &^ (1 << 63)
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// amd64:"BTRQ\t[$]60"
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n += a &^ (1 << 60)
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// amd64:"ANDQ\t[$]-2"
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n += a &^ (1 << 0)
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return n
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}
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func bitcompl64(a, b uint64) (n uint64) {
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// amd64:"BTCQ"
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n += b ^ (1 << (a & 63))
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// amd64:"BTCQ\t[$]63"
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n += a ^ (1 << 63)
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// amd64:"BTCQ\t[$]60"
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n += a ^ (1 << 60)
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// amd64:"XORQ\t[$]1"
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n += a ^ (1 << 0)
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return n
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}
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/************************************
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* 32-bit instructions
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************************************/
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func bitcheck32_constleft(a uint32) (n int) {
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// amd64:"BTL\t[$]31"
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if a&(1<<31) != 0 {
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return 1
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}
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// amd64:"BTL\t[$]28"
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if a&(1<<28) != 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if a&(1<<0) != 0 {
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return 1
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}
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return 0
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}
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func bitcheck32_constright(a [8]uint32) (n int) {
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// amd64:"BTL\t[$]31"
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if (a[0]>>31)&1 != 0 {
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return 1
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}
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// amd64:"BTL\t[$]31"
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if a[1]>>31 != 0 {
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return 1
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}
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// amd64:"BTL\t[$]31"
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if a[2]>>31 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]28"
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if (a[3]>>28)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]1"
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if (a[4]>>1)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if (a[5]>>0)&1 == 0 {
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return 1
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}
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// amd64:"BTL\t[$]7"
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if (a[6]>>5)&4 == 0 {
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return 1
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}
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return 0
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}
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func bitcheck32_var(a, b uint32) (n int) {
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// amd64:"BTL"
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if a&(1<<(b&31)) != 0 {
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return 1
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}
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// amd64:"BTL",-"BT.\t[$]0"
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if (b>>(a&31))&1 != 0 {
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return 1
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}
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return 0
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}
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func bitcheck32_mask(a uint32) (n int) {
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// amd64:"BTL\t[$]31"
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if a&0x80000000 != 0 {
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return 1
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}
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// amd64:"BTL\t[$]27"
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if a&0x8000000 != 0 {
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return 1
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}
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// amd64:"BTL\t[$]0"
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if a&0x1 != 0 {
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return 1
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}
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return 0
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}
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func biton32(a, b uint32) (n uint32) {
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// amd64:"BTSL"
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n += b | (1 << (a & 31))
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// amd64:"BTSL\t[$]31"
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n += a | (1 << 31)
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// amd64:"BTSL\t[$]28"
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n += a | (1 << 28)
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// amd64:"ORL\t[$]1"
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n += a | (1 << 0)
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return n
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}
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func bitoff32(a, b uint32) (n uint32) {
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// amd64:"BTRL"
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n += b &^ (1 << (a & 31))
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// amd64:"BTRL\t[$]31"
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n += a &^ (1 << 31)
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// amd64:"BTRL\t[$]28"
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n += a &^ (1 << 28)
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// amd64:"ANDL\t[$]-2"
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n += a &^ (1 << 0)
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return n
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}
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func bitcompl32(a, b uint32) (n uint32) {
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// amd64:"BTCL"
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n += b ^ (1 << (a & 31))
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// amd64:"BTCL\t[$]31"
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n += a ^ (1 << 31)
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// amd64:"BTCL\t[$]28"
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n += a ^ (1 << 28)
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// amd64:"XORL\t[$]1"
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n += a ^ (1 << 0)
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return n
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}
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// check direct operation on memory with constant and shifted constant sources
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func bitOpOnMem(a []uint32, b, c, d uint32) {
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// amd64:`ANDL\s[$]200,\s\([A-Z][A-Z0-9]+\)`
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a[0] &= 200
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// amd64:`ORL\s[$]220,\s4\([A-Z][A-Z0-9]+\)`
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a[1] |= 220
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// amd64:`XORL\s[$]240,\s8\([A-Z][A-Z0-9]+\)`
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a[2] ^= 240
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}
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func bitcheckMostNegative(b uint8) bool {
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// amd64:"TESTB"
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return b&0x80 == 0x80
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}
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// Check AND masking on arm64 (Issue #19857)
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func and_mask_1(a uint64) uint64 {
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// arm64:`AND\t`
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return a & ((1 << 63) - 1)
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}
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func and_mask_2(a uint64) uint64 {
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// arm64:`AND\t`
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return a & (1 << 63)
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}
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func and_mask_3(a, b uint32) (uint32, uint32) {
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// arm/7:`BIC`,-`AND`
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a &= 0xffffaaaa
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// arm/7:`BFC`,-`AND`,-`BIC`
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b &= 0xffc003ff
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return a, b
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}
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// Check generation of arm64 BIC/EON/ORN instructions
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func op_bic(x, y uint32) uint32 {
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// arm64:`BIC\t`,-`AND`
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return x &^ y
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}
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func op_eon(x, y, z uint32, a []uint32, n, m uint64) uint64 {
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// arm64:`EON\t`,-`EOR`,-`MVN`
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a[0] = x ^ (y ^ 0xffffffff)
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// arm64:`EON\t`,-`EOR`,-`MVN`
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a[1] = ^(y ^ z)
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// arm64:`EON\t`,-`XOR`
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a[2] = x ^ ^z
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// arm64:`EON\t`,-`EOR`,-`MVN`
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return n ^ (m ^ 0xffffffffffffffff)
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}
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func op_orn(x, y uint32) uint32 {
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// arm64:`ORN\t`,-`ORR`
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return x | ^y
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}
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// check bitsets
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func bitSetPowerOf2Test(x int) bool {
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// amd64:"BTL\t[$]3"
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return x&8 == 8
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}
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func bitSetTest(x int) bool {
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// amd64:"ANDL\t[$]9, AX"
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// amd64:"CMPQ\tAX, [$]9"
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return x&9 == 9
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}
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// mask contiguous one bits
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func cont1Mask64U(x uint64) uint64 {
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// s390x:"RISBGZ\t[$]16, [$]47, [$]0,"
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return x & 0x0000ffffffff0000
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}
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// mask contiguous zero bits
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func cont0Mask64U(x uint64) uint64 {
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// s390x:"RISBGZ\t[$]48, [$]15, [$]0,"
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return x & 0xffff00000000ffff
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}
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func issue44228a(a []int64, i int) bool {
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// amd64: "BTQ", -"SHL"
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return a[i>>6]&(1<<(i&63)) != 0
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}
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func issue44228b(a []int32, i int) bool {
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// amd64: "BTL", -"SHL"
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return a[i>>5]&(1<<(i&31)) != 0
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}
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func issue48467(x, y uint64) uint64 {
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// arm64: -"NEG"
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d, borrow := bits.Sub64(x, y, 0)
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return x - d&(-borrow)
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}
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func foldConst(x, y uint64) uint64 {
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// arm64: "ADDS\t[$]7",-"MOVD\t[$]7"
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d, b := bits.Add64(x, 7, 0)
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return b & d
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}
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func foldConstOutOfRange(a uint64) uint64 {
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// arm64: "MOVD\t[$]19088744",-"ADD\t[$]19088744"
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return a + 0x1234568
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}
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