mirror of
https://github.com/golang/go.git
synced 2025-05-05 15:43:04 +00:00
a4d0269a4f
Checking that the lengths are equal and panicking teaches the compiler that it can assume “i in range for z” implies “i in range for x”, letting us simplify the actual loops a bit. It also turns up a few places in math/big that were playing maybe a little too fast and loose with slice lengths. Update those to explicitly set all the input slices to the same length. These speedups are basically irrelevant, since they only happen in real code if people are compiling with -tags math_big_pure_go. But at least the code is clearer. benchmark \ system c3h88 c2s16 s7 386 s7-386 c4as16 mac arm loong64 ppc64le riscv64 s390x AddVV/words=1/impl=go ~ +11.20% +5.11% -7.67% -7.77% +1.90% +10.76% -33.22% ~ +10.98% ~ +6.60% AddVV/words=10/impl=go -22.12% -13.48% -10.37% -17.95% -18.07% -24.58% -22.04% -29.95% -14.22% ~ -6.33% +3.66% AddVV/words=16/impl=go -9.75% -13.73% ~ -21.90% -18.66% -30.03% -20.45% -28.09% -17.33% -7.15% -8.96% +12.55% AddVV/words=100/impl=go -5.91% -1.02% ~ -29.23% -22.18% -25.62% -6.49% -23.59% -22.31% -1.88% -14.13% +9.23% AddVV/words=1000/impl=go -0.52% -0.19% -3.58% -33.89% -23.46% -22.46% ~ -24.00% -24.73% +0.93% -15.79% +12.32% AddVV/words=10000/impl=go ~ ~ ~ -33.79% -23.72% -23.79% -5.98% -23.92% ~ +0.78% -15.45% +8.59% AddVV/words=100000/impl=go ~ ~ ~ -33.90% -24.25% -22.82% -4.09% -24.63% ~ +1.00% -13.56% ~ SubVV/words=1/impl=go ~ +11.64% +14.05% ~ -4.07% ~ +10.79% -33.69% ~ ~ +3.89% +12.33% SubVV/words=10/impl=go -10.31% -14.09% -7.38% +13.76% -13.25% -18.05% -20.08% -24.97% -14.15% +10.13% -0.97% -2.51% SubVV/words=16/impl=go -8.06% -13.73% -5.70% +17.00% -12.83% -23.76% -17.52% -25.25% -17.30% -2.80% -4.96% -18.25% SubVV/words=100/impl=go -9.22% -1.30% -2.76% +20.88% -14.35% -15.29% -8.49% -19.64% -22.31% -0.68% -14.30% -9.04% SubVV/words=1000/impl=go -0.60% ~ -3.43% +23.08% -16.14% -11.96% ~ -28.52% -24.73% ~ -15.95% -9.91% SubVV/words=10000/impl=go ~ ~ ~ +26.01% -15.24% -11.92% ~ -28.26% +4.25% ~ -15.42% -5.95% SubVV/words=100000/impl=go ~ ~ ~ +25.71% -15.83% -12.13% ~ -27.88% -1.27% ~ -13.57% -6.72% LshVU/words=1/impl=go +0.56% +0.36% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ LshVU/words=10/impl=go +13.37% +4.63% ~ ~ ~ ~ ~ -2.90% ~ ~ ~ ~ LshVU/words=16/impl=go +22.83% +6.47% ~ ~ ~ ~ ~ ~ +0.80% ~ ~ +5.88% LshVU/words=100/impl=go +7.56% +13.95% ~ ~ ~ ~ ~ ~ +0.33% -2.50% ~ ~ LshVU/words=1000/impl=go +0.64% +17.92% ~ ~ ~ ~ ~ -6.52% ~ -2.58% ~ ~ LshVU/words=10000/impl=go ~ +17.60% ~ ~ ~ ~ ~ -6.64% -6.22% -1.40% ~ ~ LshVU/words=100000/impl=go ~ +14.57% ~ ~ ~ ~ ~ ~ -5.47% ~ ~ ~ RshVU/words=1/impl=go ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ +2.72% RshVU/words=10/impl=go ~ ~ ~ ~ ~ ~ ~ +2.50% ~ ~ ~ ~ RshVU/words=16/impl=go ~ +0.53% ~ ~ ~ ~ ~ +3.82% ~ ~ ~ ~ RshVU/words=100/impl=go ~ ~ ~ ~ ~ ~ ~ +6.18% ~ ~ ~ ~ RshVU/words=1000/impl=go ~ ~ ~ ~ ~ ~ ~ +7.00% ~ ~ ~ ~ RshVU/words=10000/impl=go ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ RshVU/words=100000/impl=go ~ ~ ~ ~ ~ ~ ~ +7.05% ~ ~ ~ ~ MulAddVWW/words=1/impl=go -10.34% +4.43% +10.62% -1.62% -4.74% -2.86% +11.75% ~ -8.00% +8.89% +3.87% ~ MulAddVWW/words=10/impl=go -1.61% -5.87% ~ -8.30% -4.55% +0.87% ~ -5.28% -20.82% ~ ~ -2.32% MulAddVWW/words=16/impl=go -2.96% -5.28% ~ -9.22% -5.28% ~ ~ -3.74% -19.52% -1.48% -2.53% -9.52% MulAddVWW/words=100/impl=go -3.89% -7.53% +1.93% -10.49% -4.87% -8.27% ~ ~ -0.65% -0.61% -7.59% -20.61% MulAddVWW/words=1000/impl=go -0.45% -3.91% +4.54% -11.46% -4.69% -8.53% ~ ~ -0.05% ~ -8.88% -19.77% MulAddVWW/words=10000/impl=go ~ -3.30% +4.10% -11.34% -4.10% -9.43% ~ -0.61% ~ -0.55% -8.21% -18.48% MulAddVWW/words=100000/impl=go -0.30% -3.03% +4.31% -11.55% -4.41% -9.74% ~ -0.75% +0.63% ~ -7.80% -19.82% AddMulVVWW/words=1/impl=go ~ +13.09% +12.50% -7.05% -10.41% +2.53% +13.32% -3.49% ~ +15.56% +3.62% ~ AddMulVVWW/words=10/impl=go -15.96% -9.06% -5.06% -14.56% -11.83% -5.44% -26.30% -14.23% -11.44% -1.79% -5.93% -6.60% AddMulVVWW/words=16/impl=go -19.05% -12.43% -6.19% -14.24% -12.67% -8.65% -18.64% -16.56% -10.64% -3.00% -7.61% -12.80% AddMulVVWW/words=100/impl=go -22.13% -16.59% -13.04% -13.79% -11.46% -12.01% -6.46% -21.80% -5.08% -3.13% -13.60% -22.53% AddMulVVWW/words=1000/impl=go -17.07% -17.05% -14.08% -13.59% -12.13% -11.21% ~ -22.81% -4.27% -1.27% -16.35% -23.47% AddMulVVWW/words=10000/impl=go -15.03% -16.78% -14.23% -13.86% -11.84% -11.69% ~ -22.75% -13.39% -1.10% -14.37% -22.01% AddMulVVWW/words=100000/impl=go -13.70% -14.90% -14.26% -13.55% -12.04% -11.63% ~ -22.61% ~ -2.53% -10.42% -23.16% Change-Id: Ic6f64344484a762b818c7090d1396afceb638607 Reviewed-on: https://go-review.googlesource.com/c/go/+/665155 Auto-Submit: Russ Cox <rsc@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Alan Donovan <adonovan@google.com>
The Go Programming Language
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.
Download and Install
Binary Distributions
Official binary distributions are available at https://go.dev/dl/.
After downloading a binary release, visit https://go.dev/doc/install for installation instructions.
Install From Source
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.
Contributing
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.