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The Go programming language
programming-language language go
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@benshi001 @bradfitz
benshi001 and bradfitz cmd/compile: optimize ARM's math.bits.RotateLeft32 
This CL optimizes math.bits.RotateLeft32 to inline
"MOVW Rx@>Ry, Rd" on ARM.

The benchmark results of math/bits show some improvements.
name               old time/op  new time/op  delta
RotateLeft-4       9.42ns ± 0%  6.91ns ± 0%  -26.66%  (p=0.000 n=40+33)
RotateLeft8-4      8.79ns ± 0%  8.79ns ± 0%   -0.04%  (p=0.000 n=40+31)
RotateLeft16-4     8.79ns ± 0%  8.79ns ± 0%   -0.04%  (p=0.000 n=40+32)
RotateLeft32-4     8.16ns ± 0%  7.54ns ± 0%   -7.68%  (p=0.000 n=40+40)
RotateLeft64-4     15.7ns ± 0%  15.7ns ± 0%     ~     (all equal)

updates #31265

Change-Id: I77bc1c2c702d5323fc7cad5264a8e2d5666bf712
Reviewed-on: https://go-review.googlesource.com/c/go/+/188697
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Latest commit 3cfd003 Aug 2, 2019
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.github .github: don't render author-facing text in ISSUE_TEMPLATE Nov 2, 2018
api api/go1.13: add debug/elf.Symbol fields added in CL 184099 Aug 8, 2019
doc crypto/tls: make SSLv3 again disabled by default Aug 27, 2019
lib/time lib/time: update tz data to 2019b Jul 3, 2019
misc runtime,syscall/js: reuse wasm memory DataView Aug 28, 2019
src cmd/compile: optimize ARM's math.bits.RotateLeft32 Aug 28, 2019
test cmd/compile: optimize ARM's math.bits.RotateLeft32 Aug 28, 2019
.gitattributes .gitattributes: prevent all magic line ending changes Dec 12, 2014
.gitignore .gitignore: ignore src/cmd/dist/dist Oct 28, 2017
AUTHORS A: Add Maya Rashish (individual CLA) Apr 23, 2019
CONTRIBUTING.md all: restore changes from faulty merge/revert Feb 12, 2018
CONTRIBUTORS CONTRIBUTORS: first round of updates for Go 1.13 Jul 17, 2019
LICENSE doc: revert copyright date to 2009 Jun 1, 2016
PATENTS LICENSE: separate, change PATENTS text Dec 6, 2010
README.md README: linkify some paths Jun 6, 2018
SECURITY.md SECURITY.md: add security file May 23, 2019
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions 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://golang.org/dl/.

After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.

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