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60ffae25bc
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Nigel Tao 60ffae25bc hash/adler32: optimize. 
The bulk of the gains come from hoisting the modulo ops outside of
the inner loop.

Reducing the digest type from 8 bytes to 4 bytes gains another 1% on
the hash/adler32 micro-benchmark.

Benchmarks for $GOOS,$GOARCH = linux,amd64 below.

hash/adler32 benchmark:
benchmark             old ns/op    new ns/op    delta
BenchmarkAdler32KB         1660         1364  -17.83%

image/png benchmark:
benchmark                       old ns/op    new ns/op    delta
BenchmarkDecodeGray               2466909      2425539   -1.68%
BenchmarkDecodeNRGBAGradient      9884500      9751705   -1.34%
BenchmarkDecodeNRGBAOpaque        8511615      8379800   -1.55%
BenchmarkDecodePaletted           1366683      1330677   -2.63%
BenchmarkDecodeRGB                6987496      6884974   -1.47%
BenchmarkEncodePaletted           6292408      6040052   -4.01%
BenchmarkEncodeRGBOpaque         19780680     19178440   -3.04%
BenchmarkEncodeRGBA              80738600     79076800   -2.06%

Wall time for Denis Cheremisov's PNG-decoding program given in
https://groups.google.com/group/golang-nuts/browse_thread/thread/22aa8a05040fdd49
Before: 2.44s
After:  2.26s
Delta:  -7%

R=rsc
CC=golang-dev
https://golang.org/cl/6251044
2012-05-25 09:58:38 +10:00
api archive/tar: add FileInfoHeader function 2012-05-24 14:10:54 -07:00
doc spec: clarify evaluation order of "i, x[i] = range ..." 2012-05-24 10:59:48 -07:00
include build: remove unnecessary pragmas 2012-02-06 12:45:23 -05:00
lib codereview: support mercurial 2.2.1 2012-05-17 02:54:03 +08:00
misc misc/chrome/gophertool: lower CL number's lower bound and fix input focus on Mac 2012-05-17 04:22:44 +08:00
src hash/adler32: optimize. 2012-05-25 09:58:38 +10:00
test cmd/gc: faster code, mainly for rotate 2012-05-24 17:20:07 -04:00
.hgignore build: update Makefile to track source code dependencies better 2012-03-13 03:31:11 +08:00
.hgtags re-tag go1.0.1 2012-04-26 12:51:55 -07:00
AUTHORS A+C: add James Gray (Individual CLA) 2012-05-18 10:32:54 -07:00
CONTRIBUTORS C: Bill Thiede (Google CLA) 2012-05-25 09:18:12 +10:00
favicon.ico add a favicon plus a couple of hi-res versions of gordon 2009-10-26 10:13:07 -07:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README build: update, streamline documentation for new $GOBIN 2010-08-24 20:00:50 -04:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

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.