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The Go programming language
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Ilya Tocar e53cc7ae93 runtime: avoid division in growslice 
Add a special case for power-of-2 sized elements.
We can replace div/mul with left/right shift and avoid expensive operation.
growslice is hotter for short slices of small elements, such as int16, so
add an int16 version for GrowSlice benchmark.

name                   old time/op  new time/op  delta
GrowSlice/Byte-6       61.3ns ± 3%  60.5ns ± 4%  -1.33%  (p=0.002 n=30+30)
GrowSlice/Int16-6      94.0ns ± 4%  84.7ns ± 2%  -9.82%  (p=0.000 n=30+30)
GrowSlice/Int-6         100ns ± 1%    99ns ± 1%  -0.25%  (p=0.032 n=29+28)
GrowSlice/Ptr-6         197ns ± 2%   195ns ± 2%  -0.94%  (p=0.001 n=30+29)
GrowSlice/Struct/24-6   168ns ± 1%   166ns ± 2%  -1.09%  (p=0.000 n=25+30)
GrowSlice/Struct/32-6   187ns ± 2%   180ns ± 1%  -3.59%  (p=0.000 n=30+30)
GrowSlice/Struct/40-6   241ns ± 2%   238ns ± 2%  -1.41%  (p=0.000 n=30+30)

Change-Id: I31e8388d73fd9356e2dcc091d8d92eef3e3ccdbc
Reviewed-on: https://go-review.googlesource.com/102279
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
 		2018-04-13 21:33:52 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api api: remove unnecessary lines from except.txt 2018-04-09 21:19:11 +00:00
doc doc/install.html: address comments from review of previous edit 2018-04-11 05:24:49 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/ios: speed up the iOS exec wrapper 2018-04-12 19:30:54 +00:00
src runtime: avoid division in growslice 2018-04-13 21:33:52 +00:00
test all: use new softfloat on GOARM=5 2018-04-13 16:39:39 +00:00
.gitattributes
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update my name and spelling 2018-02-21 04:12:57 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Filippo Valsorda's @golang.org email 2018-03-12 22:29:04 +00:00
LICENSE
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README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +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.

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.