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The Go programming language
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daf43ba476
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Nigel Tao daf43ba476 image/jpeg: change block from [64]int to [64]int32. 
On 6g/linux:
benchmark                     old ns/op    new ns/op    delta
BenchmarkFDCT                      4606         4241   -7.92%
BenchmarkIDCT                      4187         3923   -6.31%
BenchmarkDecodeBaseline         3154864      3170224   +0.49%
BenchmarkDecodeProgressive      4072812      4017132   -1.37%
BenchmarkEncode                39406920     34596760  -12.21%

Stack requirements before (from 'go tool 6g -S'):
(scan.go:37) TEXT    (*decoder).processSOS+0(SB),$1352-32
(writer.go:448) TEXT    (*encoder).writeSOS+0(SB),$5344-24

after:
(scan.go:37) TEXT    (*decoder).processSOS+0(SB),$1064-32
(writer.go:448) TEXT    (*encoder).writeSOS+0(SB),$2520-24

Also, in encoder.writeSOS, re-use the yBlock scratch buffer for Cb and
Cr. This reduces the stack requirement slightly, but also avoids an
unlucky coincidence where a BenchmarkEncode stack split lands between
encoder.writeByte and bufio.Writer.WriteByte, which occurs very often
during Huffman encoding and is otherwise disasterous for the final
benchmark number. FWIW, the yBlock re-use *without* the s/int/int32/
change does not have a noticable effect on the benchmarks.

R=r
CC=golang-dev, rsc
https://golang.org/cl/6823043
2012-10-30 11:10:08 +11:00
api cmd/api: add exception file 2012-10-04 11:35:17 +10:00
doc doc: remove misplaced articles from references page 2012-10-25 11:05:42 +11:00
include lib9, cmd/dist, cmd/5l: embed GOARM into cmd/5l and auto detect GOARM 2012-10-22 14:26:36 +08:00
lib codereview: protect against read-only upstream repository 2012-10-20 17:23:48 +08:00
misc misc/vim: fix reimport guard and remove K mapping. 2012-10-29 22:10:59 +11:00
src image/jpeg: change block from [64]int to [64]int32. 2012-10-30 11:10:08 +11:00
test cmd/gc: escape analysis to track flow of in to out parameters. 2012-10-29 13:38:21 +01:00
.hgignore build: update Makefile to track source code dependencies better 2012-03-13 03:31:11 +08:00
.hgtags tag go1.0.3 2012-09-24 13:15:33 -05:00
AUTHORS A+C: Andrey Radev (individual CLA). 2012-10-29 22:10:45 +11:00
CONTRIBUTORS CONTRIBUTORS: add Pawel Szczur (Google CLA) 2012-10-29 17:54:22 +01:00
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
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.