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b505ff6279
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Russ Cox b505ff6279 crypto/rc4: faster amd64 implementation 
XOR key into data 128 bits at a time instead of 64 bits
and pipeline half of state loads. Rotate loop to allow
single-register indexing for state[i].

On a MacBookPro10,2 (Core i5):

benchmark           old ns/op    new ns/op    delta
BenchmarkRC4_128          412          224  -45.63%
BenchmarkRC4_1K          3179         1613  -49.26%
BenchmarkRC4_8K         25223        12545  -50.26%

benchmark            old MB/s     new MB/s  speedup
BenchmarkRC4_128       310.51       570.42    1.84x
BenchmarkRC4_1K        322.09       634.48    1.97x
BenchmarkRC4_8K        320.97       645.32    2.01x

For comparison, on the same machine, openssl 0.9.8r reports
its rc4 speed as somewhat under 350 MB/s for both 1K and 8K
(it is operating 64 bits at a time).

On an Intel Xeon E5520:

benchmark           old ns/op    new ns/op    delta
BenchmarkRC4_128          418          259  -38.04%
BenchmarkRC4_1K          3200         1884  -41.12%
BenchmarkRC4_8K         25173        14529  -42.28%

benchmark            old MB/s     new MB/s  speedup
BenchmarkRC4_128       306.04       492.48    1.61x
BenchmarkRC4_1K        319.93       543.26    1.70x
BenchmarkRC4_8K        321.61       557.20    1.73x

For comparison, on the same machine, openssl 1.0.1
reports its rc4 speed as 587 MB/s for 1K and 601 MB/s for 8K.

R=agl
CC=golang-dev
https://golang.org/cl/7865046
2013-03-21 16:38:57 -04:00
api api/next.txt: remove references to go/types, now in separate repo 2013-03-12 14:42:37 -07:00
doc spec: fix description of initialization 2013-03-20 15:05:28 -07:00
include build: fix for 32-bit windows builds on 64-bit windows system 2013-03-15 12:30:14 -04:00
lib go/doc, godoc: improved note reading 2013-03-19 11:14:35 -07:00
misc misc/swig: remove old broken Makefile 2013-03-20 08:06:58 -07:00
src crypto/rc4: faster amd64 implementation 2013-03-21 16:38:57 -04:00
test cmd/gc: fix escape analysis of method values 2013-03-20 23:53:27 -04:00
.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: Herbert Georg Fischer (individual CLA) 2013-03-15 13:43:29 -07:00
CONTRIBUTORS A+C: Herbert Georg Fischer (individual CLA) 2013-03-15 13:43:29 -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
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.