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a712e20a1d
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Rui Ueyama a712e20a1d runtime: speed up amd64 memmove 
MOV with SSE registers seems faster than REP MOVSQ if the
size being copied is less than about 2K. Previously we
didn't use MOV if the memory region is larger than 256
byte. This patch improves the performance of 257 ~ 2048
byte non-overlapping copy by using MOV.

Here is the benchmark result on Intel Xeon 3.5GHz (Nehalem).

benchmark               old ns/op    new ns/op    delta
BenchmarkMemmove16              4            4   +0.42%
BenchmarkMemmove32              5            5   -0.20%
BenchmarkMemmove64              6            6   -0.81%
BenchmarkMemmove128             7            7   -0.82%
BenchmarkMemmove256            10           10   +1.92%
BenchmarkMemmove512            29           16  -44.90%
BenchmarkMemmove1024           37           25  -31.55%
BenchmarkMemmove2048           55           44  -19.46%
BenchmarkMemmove4096           92           91   -0.76%

benchmark                old MB/s     new MB/s  speedup
BenchmarkMemmove16        3370.61      3356.88    1.00x
BenchmarkMemmove32        6368.68      6386.99    1.00x
BenchmarkMemmove64       10367.37     10462.62    1.01x
BenchmarkMemmove128      17551.16     17713.48    1.01x
BenchmarkMemmove256      24692.81     24142.99    0.98x
BenchmarkMemmove512      17428.70     31687.72    1.82x
BenchmarkMemmove1024     27401.82     40009.45    1.46x
BenchmarkMemmove2048     36884.86     45766.98    1.24x
BenchmarkMemmove4096     44295.91     44627.86    1.01x

LGTM=khr
R=golang-codereviews, gobot, khr
CC=golang-codereviews
https://golang.org/cl/90500043
2014-06-23 12:06:26 -07:00
api api: add go1.3.txt 2014-06-02 11:45:00 +09:00
doc doc: say that race detector is supported on freebsd 2014-06-21 20:19:49 +04:00
include liblink: fix field tracking 2014-05-20 00:30:58 -04:00
lib lib/codereview: fix doc/go1.*.txt exception 2014-06-12 20:12:50 -04:00
misc misc/emacs: add new function godoc-at-point 2014-06-17 15:52:29 -04:00
src runtime: speed up amd64 memmove 2014-06-23 12:06:26 -07:00
test test: add test case for issue 8074. 2014-06-22 17:33:00 +10:00
.hgignore lib9: enable on Plan 9 2014-02-13 20:06:41 +01:00
.hgtags tag go1.3 2014-06-19 11:21:35 +10:00
AUTHORS A+C: Alan Shreve (individual CLA) 2014-06-13 21:09:23 -07:00
CONTRIBUTORS A+C: Alan Shreve (individual CLA) 2014-06-13 21:09:23 -07:00
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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-source.html
in your web browser.

After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.

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.