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erifan01 de28555c0b internal/bytealg: optimize Equal on arm64 Currently the 16-byte loop chunk16_loop is implemented with NEON instructions LD1, VMOV and VCMEQ. Using scalar instructions LDP and CMP to achieve this loop can reduce the number of clock cycles. For cases where the length of strings are between 4 to 15 bytes, loading the last 8 or 4 bytes at a time to reduce the number of comparisons. Benchmarks: name old time/op new time/op delta Equal/0-8 5.51ns ± 0% 5.84ns ±14% ~ (p=0.246 n=7+8) Equal/1-8 10.5ns ± 0% 10.5ns ± 0% ~ (all equal) Equal/6-8 14.0ns ± 0% 12.5ns ± 0% -10.71% (p=0.000 n=8+8) Equal/9-8 13.5ns ± 0% 12.5ns ± 0% -7.41% (p=0.000 n=8+8) Equal/15-8 15.5ns ± 0% 12.5ns ± 0% -19.35% (p=0.000 n=8+8) Equal/16-8 14.0ns ± 0% 13.0ns ± 0% -7.14% (p=0.000 n=8+8) Equal/20-8 16.5ns ± 0% 16.0ns ± 0% -3.03% (p=0.000 n=8+8) Equal/32-8 16.5ns ± 0% 15.3ns ± 0% -7.27% (p=0.000 n=8+8) Equal/4K-8 552ns ± 0% 553ns ± 0% ~ (p=0.315 n=8+8) Equal/4M-8 1.13ms ±23% 1.20ms ±27% ~ (p=0.442 n=8+8) Equal/64M-8 32.9ms ± 0% 32.6ms ± 0% -1.15% (p=0.000 n=8+8) CompareBytesEqual-8 12.0ns ± 0% 12.0ns ± 0% ~ (all equal) Change-Id: If317ecdcc98e31883d37fd7d42b113b548c5bd2a Reviewed-on: https://go-review.googlesource.com/112496 Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com>		2018-09-12 19:56:55 +00:00
.github	.github: use HTTPS for Stack Overflow link in SUPPORT.md	2018-06-12 11:08:14 +00:00
api	syscall: implement Unix Socket for Windows	2018-08-28 09:26:45 +00:00
doc	doc: make golang-nuts discussion list more prominent	2018-09-08 19:47:06 +00:00
lib/time	lib/time: update vendored tzdata to release 2018e	2018-06-11 14:47:06 +00:00
misc	misc/cgo/testplugin: disable DWARF tests on darwin	2018-09-05 11:27:37 +00:00
src	internal/bytealg: optimize Equal on arm64	2018-09-12 19:56:55 +00:00
test	test: fix the wrong test of math.Copysign(c, -1) for arm64	2018-09-12 15:34:20 +00:00
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.gitignore	.gitignore: ignore src/cmd/dist/dist	2017-10-28 21:55:49 +00:00
AUTHORS	A+C: add VMware as author, Venil Noronha as contributor	2018-08-31 02:14:24 +00:00
CONTRIBUTING.md	all: restore changes from faulty merge/revert	2018-02-12 20:13:59 +00:00
CONTRIBUTORS	A+C: add VMware as author, Venil Noronha as contributor	2018-08-31 02:14:24 +00:00
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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 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.