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The Go programming language
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df70982825
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Ilya Tocar df70982825 cmd/compile/internal/ssa: use sse to zero on amd64 
Use 16-byte stores instead of 8-byte stores to zero small blocks.
Also switch to duffzero for 65+ bytes only, because for each
duffzero call we also save/restore BP, so call requires 4 instructions
and replacing it with 4 sse stores doesn't cause code-bloat.
Also switch duffzero to use leaq, instead of addq to avoid clobbering flags.

ClearFat8-6     0.54ns ± 0%  0.54ns ± 0%     ~     (all equal)
ClearFat12-6    1.07ns ± 0%  1.07ns ± 0%     ~     (all equal)
ClearFat16-6    1.07ns ± 0%  0.69ns ± 0%  -35.51%  (p=0.001 n=8+9)
ClearFat24-6    1.61ns ± 1%  1.07ns ± 0%  -33.33%  (p=0.000 n=10+10)
ClearFat32-6    2.14ns ± 0%  1.07ns ± 0%  -50.00%  (p=0.001 n=8+9)
ClearFat40-6    2.67ns ± 1%  1.61ns ± 0%  -39.72%  (p=0.000 n=10+8)
ClearFat48-6    3.75ns ± 0%  2.68ns ± 0%  -28.59%  (p=0.000 n=9+9)
ClearFat56-6    4.29ns ± 0%  3.22ns ± 0%  -25.10%  (p=0.000 n=9+9)
ClearFat64-6    4.30ns ± 0%  3.22ns ± 0%  -25.15%  (p=0.000 n=8+8)
ClearFat128-6   7.50ns ± 1%  7.51ns ± 0%     ~     (p=0.767 n=10+9)
ClearFat256-6   13.9ns ± 1%  13.9ns ± 1%     ~     (p=0.257 n=10+10)
ClearFat512-6   26.8ns ± 0%  26.8ns ± 0%     ~     (p=0.467 n=8+8)
ClearFat1024-6  52.5ns ± 0%  52.5ns ± 0%     ~     (p=1.000 n=8+8)

Also shaves ~20kb from go tool:

go_old 10384994
go_new 10364514 [-20480 bytes]

section differences
global text (code) = -20585 bytes (-0.532047%)
read-only data = -302 bytes (-0.018101%)
Total difference -20887 bytes (-0.348731%)

Change-Id: I15854e87544545c1af24775df895e38e16e12694
Reviewed-on: https://go-review.googlesource.com/54410
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2017-08-16 15:52:27 +00:00
.github .github: add .md extension to SUPPORT file 2017-07-30 21:46:28 +00:00
api doc, api: add syscall.SysProcAttr.AmbientCaps change to 1.9 notes, API 2017-06-29 03:29:46 +00:00
doc spec: better comment in example for type definition 2017-08-14 13:35:43 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc misc/cgo/testshared: call flag.Parse in TestMain 2017-08-15 13:58:48 +00:00
src cmd/compile/internal/ssa: use sse to zero on amd64 2017-08-16 15:52:27 +00:00
test cmd/compile: generate makechan calls with int arguments 2017-08-15 05:54:24 +00:00
.gitattributes
.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +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
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE
PATENTS
README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
robots.txt

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 hundreds of contributors. We appreciate your help!

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.