qbit/go: The Go programming language - go

qbit/go

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The Go programming language

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Keith Randall 6021449236 runtime: faster x86 memmove (a.k.a. built-in copy()) REP instructions have a high startup cost, so we handle small sizes with some straightline code. The REP MOVSx instructions are really fast for large sizes. The cutover is approximately 1K. We implement up to 128/256 because that is the maximum SSE register load (loading all data into registers before any stores lets us ignore copy direction). (on a Sandy Bridge E5-1650 @ 3.20GHz) benchmark old ns/op new ns/op delta BenchmarkMemmove0 3 3 +0.86% BenchmarkMemmove1 5 5 +5.40% BenchmarkMemmove2 18 8 -56.84% BenchmarkMemmove3 18 7 -58.45% BenchmarkMemmove4 36 7 -78.63% BenchmarkMemmove5 36 8 -77.91% BenchmarkMemmove6 36 8 -77.76% BenchmarkMemmove7 36 8 -77.82% BenchmarkMemmove8 18 8 -56.33% BenchmarkMemmove9 18 7 -58.34% BenchmarkMemmove10 18 7 -58.34% BenchmarkMemmove11 18 7 -58.45% BenchmarkMemmove12 36 7 -78.51% BenchmarkMemmove13 36 7 -78.48% BenchmarkMemmove14 36 7 -78.56% BenchmarkMemmove15 36 7 -78.56% BenchmarkMemmove16 18 7 -58.24% BenchmarkMemmove32 18 8 -54.33% BenchmarkMemmove64 18 8 -53.37% BenchmarkMemmove128 20 9 -55.93% BenchmarkMemmove256 25 11 -55.16% BenchmarkMemmove512 33 33 -1.19% BenchmarkMemmove1024 43 44 +2.06% BenchmarkMemmove2048 61 61 +0.16% BenchmarkMemmove4096 95 95 +0.00% R=golang-dev, bradfitz, remyoudompheng, khr, iant, dominik.honnef CC=golang-dev https://golang.org/cl/9038048		2013-05-17 12:53:49 -07:00
api	api: add go1.1.txt; update cmd/api to use it	2013-05-06 17:25:09 -07:00
doc	doc/go_spec: fix typos	2013-05-15 03:50:27 +08:00
include	include/plan9/libc.h: fix Plan 9 build	2013-03-30 19:05:00 +08:00
lib	lib/time: update to IANA 2013c	2013-04-22 16:28:42 -07:00
misc	misc/cgo/test: deflake TestParallelSleep once more	2013-05-18 02:55:44 +08:00
src	runtime: faster x86 memmove (a.k.a. built-in copy())	2013-05-17 12:53:49 -07:00
test	cmd/gc: repair make(T) in export data for inlining.	2013-05-16 09:01:43 +02:00
.hgignore	build: update Makefile to track source code dependencies better	2012-03-13 03:31:11 +08:00
.hgtags	tag go1.1	2013-05-13 13:04:08 -07:00
AUTHORS	A+C: Alberto García Hierro (individual CLA)	2013-05-14 15:31:46 -07:00
CONTRIBUTORS	A+C: Alberto García Hierro (individual CLA)	2013-05-14 15:31:46 -07:00
favicon.ico	godoc: update favicon	2012-10-11 17:02:36 +11:00
LICENSE	doc: update licensing text one more time	2012-03-27 15:09:13 +11:00
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README
robots.txt

README

This is the source code repository for the Go programming language.  

For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.

After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.

Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.

--

Binary Distribution Notes

If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README).  You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.

For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:

    export GOROOT=$HOME/go
    export PATH=$PATH:$GOROOT/bin

See doc/install.html for more details.