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Nigel Tao 4de6687554 cmd/gc: recognize (a.b[0]<<1 | a.b[0]>>31) as a rotate, not just 
(x<<1 | x>>31).

Fixes #5084.

On the SHA3 benchmark proposals at
https://golang.org/cl/7760044/

benchmark                       old ns/op    new ns/op    delta
BenchmarkPermutationFunction         1288         1191   -7.53%
BenchmarkSingleByteWrite             5795         5811   +0.28%
BenchmarkBlockWrite512                178          179   +0.56%
BenchmarkBlockWrite384                230          233   +1.30%
BenchmarkBlockWrite256                282          286   +1.42%
BenchmarkBlockWrite224                301          306   +1.66%
BenchmarkBulkHashSHA3_512          326885       304548   -6.83%
BenchmarkBulkHashSHA3_384          234839       220074   -6.29%
BenchmarkBulkHashSHA3_256          186969       175790   -5.98%
BenchmarkBulkHashSHA3_224          178133       167489   -5.98%

For a function like

func g() {
        x = a[3]<<20 | a[3]>>12
}

the asm goes from

0006 (main.go:10) TEXT    g+0(SB),$0-0
0007 (main.go:10) MOVL    a+12(SB),BP
0008 (main.go:10) LOCALS  ,$0
0009 (main.go:11) MOVL    BP,BX
0010 (main.go:11) SHLL    $20,BX
0011 (main.go:11) SHRL    $12,BP
0012 (main.go:11) ORL     BP,BX
0013 (main.go:11) MOVL    BX,x+0(SB)
0014 (main.go:12) RET     ,

to

0006 (main.go:10) TEXT    g+0(SB),$0-0
0007 (main.go:10) LOCALS  ,$0
0008 (main.go:11) MOVL    a+12(SB),BX
0009 (main.go:11) ROLL    $20,BX
0010 (main.go:11) MOVL    BX,x+0(SB)
0011 (main.go:12) RET     ,

R=rsc, iant, remyoudompheng
CC=golang-dev, jcb
https://golang.org/cl/7944043
2013-04-02 21:14:34 +11:00
api api: remove Zone of net.IPNet from next.txt 2013-03-29 15:07:38 +09:00
doc doc/go1.1.html: add a note about additional platforms 2013-04-02 15:08:28 +11:00
include include/plan9/libc.h: fix Plan 9 build 2013-03-30 19:05:00 +08:00
lib cmd/godoc: provide a link from notes to source location 2013-03-28 14:40:59 -07:00
misc misc/emacs: Enable compilation-mode for gofmt error buffer before displaying it. 2013-03-30 09:54:08 -07:00
src cmd/gc: recognize (a.b[0]<<1 | a.b[0]>>31) as a rotate, not just 2013-04-02 21:14:34 +11:00
test cmd/gc: do not reuse bool temporaries for composite equality. 2013-04-01 21:01:50 +02:00
.hgignore
.hgtags
AUTHORS A+C: Robert Obryk (individual CLA) 2013-03-29 14:16:41 -07:00
CONTRIBUTORS A+C: Robert Obryk (individual CLA) 2013-03-29 14:16:41 -07:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE
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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.