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>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 4.0 Attribution license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Official binary distributions are available at https://go.dev/dl/.
After downloading a binary release, visit https://go.dev/doc/install for installation instructions.
If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.
Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.