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0b9fe6d24e
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Nigel Tao 0b9fe6d24e image/jpeg: move the level-shift and clip out of the idct function, 
to be consistent with the fdct function, and to ease any future
idct rewrites in assembly.

The BenchmarkIDCT delta is obviously just an accounting change and not
a real saving, but it does give an indication of what proportion of
time was spent in the actual IDCT and what proportion was in shift and
clip. The idct time taken is now comparable to fdct.

The BenchmarkFDCT delta is an estimate of benchmark noise.

benchmark                   old ns/op    new ns/op    delta
BenchmarkFDCT                    3842         3837   -0.13%
BenchmarkIDCT                    5611         3478  -38.01%
BenchmarkDecodeRGBOpaque      2932785      2929751   -0.10%

R=r
CC=golang-dev
https://golang.org/cl/6625057
2012-10-07 11:32:02 +11:00
api cmd/api: add exception file 2012-10-04 11:35:17 +10:00
doc doc/debugging_with_gdb: fix minor typo (space before comma) 2012-10-07 11:24:14 +11:00
include src: Add support for 64-bit version of Plan 9 2012-08-31 13:21:13 -04:00
lib lib/godoc/godoc.html: try Google hosted jQuery first, fallback to locally hosted one 2012-10-04 15:14:20 +08:00
misc misc/dashboard: set charset utf-8 on build log downloads 2012-10-03 08:16:27 -07:00
src image/jpeg: move the level-shift and clip out of the idct function, 2012-10-07 11:32:02 +11:00
test cmd/gc: avoid clobbering the AST in cgen_callmeth. 2012-10-07 00:52:40 +02:00
.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: add Jeff Wendling (Individual CLA) 2012-10-01 16:49:29 -04:00
CONTRIBUTORS A+C: add Jeff Wendling (Individual CLA) 2012-10-01 16:49:29 -04:00
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LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS
README
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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.