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| author | Meng Zhuo <mengzhuo@iscas.ac.cn> | 2025-11-14 12:47:35 +0800 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2025-11-14 11:01:22 -0800 |
| commit | 2cdcc4150bc577e0b40a9cedaaa7c8301f2860cd (patch) | |
| tree | c1188dadb485a884faa11ffc50a5f9c5ec590fd6 /test/codegen | |
| parent | b57962b7c7de2b70fa943e66cd26b2cce631b7f8 (diff) | |
| download | go-2cdcc4150bc577e0b40a9cedaaa7c8301f2860cd.tar.xz | |
cmd/compile: fold negation into multiplication
goos: linux
goarch: riscv64
pkg: cmd/compile/internal/test
cpu: Spacemit(R) X60
│ /root/mul.base.log │ /root/mul.new.log │
│ sec/op │ sec/op vs base │
MulNeg 6.426µ ± 0% 4.501µ ± 0% -29.96% (p=0.000 n=10)
Mul2Neg 9.000µ ± 0% 6.431µ ± 0% -28.54% (p=0.000 n=10)
Mul2 1.263µ ± 0% 1.263µ ± 0% ~ (p=1.000 n=10)
MulNeg2 1.577µ ± 0% 1.577µ ± 0% ~ (p=0.211 n=10)
geomean 3.276µ 2.756µ -15.89%
goos: linux
goarch: amd64
pkg: cmd/compile/internal/test
cpu: AMD EPYC 7532 32-Core Processor
│ /root/base │ /root/new │
│ sec/op │ sec/op vs base │
MulNeg 691.9n ± 1% 319.4n ± 0% -53.83% (p=0.000 n=10)
Mul2Neg 630.0n ± 0% 629.6n ± 0% -0.07% (p=0.000 n=10)
Mul2 438.1n ± 0% 438.1n ± 0% ~ (p=0.728 n=10)
MulNeg2 439.3n ± 0% 439.4n ± 0% ~ (p=0.656 n=10)
geomean 538.2n 443.6n -17.58%
Change-Id: Ice8e6c8d1e8e3009ba8a0b1b689205174e199019
Reviewed-on: https://go-review.googlesource.com/c/go/+/720180
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Diffstat (limited to 'test/codegen')
| -rw-r--r-- | test/codegen/arithmetic.go | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/test/codegen/arithmetic.go b/test/codegen/arithmetic.go index 42d5d2ef65..6b2c5529e1 100644 --- a/test/codegen/arithmetic.go +++ b/test/codegen/arithmetic.go @@ -318,13 +318,19 @@ func MergeMuls5(a, n int) int { // Multiplications folded negation func FoldNegMul(a int) int { - // loong64:"SUBVU" "ALSLV [$]2" "ALSLV [$]1" - return (-a) * 11 + // amd64:"IMUL3Q [$]-11" -"NEGQ" + // arm64:"MOVD [$]-11" "MUL" -"NEG" + // loong64:"ALSLV [$]2" "SUBVU" "ALSLV [$]4" + // riscv64:"MOV [$]-11" "MUL" -"NEG" + return -a * 11 } func Fold2NegMul(a, b int) int { + // amd64:"IMULQ" -"NEGQ" + // arm64:"MUL" -"NEG" // loong64:"MULV" -"SUBVU R[0-9], R0," - return (-a) * (-b) + // riscv64:"MUL" -"NEG" + return -a * -b } // -------------- // |