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9a14cd9e75
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Wei Xiao 9a14cd9e75 bytes: add optimized countByte for arm64 
Use SIMD instructions when counting a single byte.
Inspired from runtime IndexByte implementation.

Benchmark results of bytes, where 1 byte in every 8 is the one we are looking:

name               old time/op   new time/op    delta
CountSingle/10-8    96.1ns ± 1%    38.8ns ± 0%    -59.64%  (p=0.000 n=9+7)
CountSingle/32-8     172ns ± 2%      36ns ± 1%    -79.27%  (p=0.000 n=10+10)
CountSingle/4K-8    18.2µs ± 1%     0.9µs ± 0%    -95.17%  (p=0.000 n=9+10)
CountSingle/4M-8    18.4ms ± 0%     0.9ms ± 0%    -95.00%  (p=0.000 n=10+9)
CountSingle/64M-8    284ms ± 4%      19ms ± 0%    -93.40%  (p=0.000 n=10+10)

name               old speed     new speed      delta
CountSingle/10-8   104MB/s ± 1%   258MB/s ± 0%   +147.99%  (p=0.000 n=9+10)
CountSingle/32-8   185MB/s ± 1%   897MB/s ± 1%   +385.33%  (p=0.000 n=9+10)
CountSingle/4K-8   225MB/s ± 1%  4658MB/s ± 0%  +1967.40%  (p=0.000 n=9+10)
CountSingle/4M-8   228MB/s ± 0%  4555MB/s ± 0%  +1901.71%  (p=0.000 n=10+9)
CountSingle/64M-8  236MB/s ± 4%  3575MB/s ± 0%  +1414.69%  (p=0.000 n=10+10)

Change-Id: Ifccb51b3c8658c49773fe05147c3cf3aead361e5
Reviewed-on: https://go-review.googlesource.com/71111
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-11-21 19:07:38 +00:00
.github doc: add a link to the code of conduct 2017-11-13 16:48:04 +00:00
api api: update next.txt 2017-11-15 21:29:55 +00:00
doc doc/contrib.html: add Go 1.10 to release list 2017-11-15 21:26:27 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc cmd/cgo: special case C ptr types to use uintptr 2017-11-17 22:11:03 +00:00
src bytes: add optimized countByte for arm64 2017-11-21 19:07:38 +00:00
test cmd/compile: hint on wrong case-field names in composite literals 2017-11-20 20:29:43 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
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LICENSE
PATENTS
README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +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 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.

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

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

Note that the Go project does not use GitHub pull requests, and that we use 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.