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7b36acc4ac
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Dave Cheney 7b36acc4ac cmd/5g: avoid temporary during constant binary op 
This CL is an attempt to backport the abop code generation from 6g. This improves the generation of the range offset if the increment can be encoded directly via Operand2 shift encoding.

0023 (/home/dfc/src/range.go:7) BGE     ,29(APC)
0024 (/home/dfc/src/range.go:7) MOVW    0(R3),R5
0025 (/home/dfc/src/range.go:7) MOVW    $4,R1
0026 (/home/dfc/src/range.go:7) ADD     R1,R3,R3
0027 (/home/dfc/src/range.go:8) ADD     R5,R4,R4
0028 (/home/dfc/src/range.go:7) B       ,17(APC)

becomes

0023 (/home/dfc/src/range.go:7) BGE     ,28(APC)
0024 (/home/dfc/src/range.go:7) MOVW    0(R3),R0
0025 (/home/dfc/src/range.go:7) ADD     $4,R3,R3
0026 (/home/dfc/src/range.go:8) ADD     R0,R4,R4
0027 (/home/dfc/src/range.go:7) B       ,17(APC)

Benchmarks are unimpressive

dfc@qnap:~/go/test/bench/go1$ ~/go/misc/benchcmp {old,new}.txt
benchmark                 old ns/op    new ns/op    delta
BenchmarkBinaryTree17    2147483647   2147483647   +0.93%
BenchmarkFannkuch11      2147483647   2147483647   -2.52%
BenchmarkGobDecode        196135200    195842000   -0.15%
BenchmarkGobEncode         78581650     76734450   -2.35%
BenchmarkGzip            2147483647   2147483647   -0.47%
BenchmarkGunzip          1087243000   1070254000   -1.56%
BenchmarkJSONEncode      1107558000   1146077000   +3.48%
BenchmarkJSONDecode      2147483647   2147483647   -0.07%
BenchmarkMandelbrot200   2147483647   2147483647   -0.77%
BenchmarkParse             74328550     71653400   -3.60%
BenchmarkRevcomp          111123900    109325950   -1.62%
BenchmarkTemplate        2147483647   2147483647   -0.82%

benchmark                  old MB/s     new MB/s  speedup
BenchmarkGobDecode             3.91         3.92    1.00x
BenchmarkGobEncode             9.77        10.00    1.02x
BenchmarkGzip                  3.65         3.66    1.00x
BenchmarkGunzip               17.85        18.13    1.02x
BenchmarkJSONEncode            1.75         1.69    0.97x
BenchmarkJSONDecode            0.83         0.83    1.00x
BenchmarkParse                 0.78         0.81    1.04x
BenchmarkRevcomp              22.87        23.25    1.02x
BenchmarkTemplate              0.84         0.85    1.01x

R=remyoudompheng, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6564067
2012-10-02 08:12:39 +10:00
api api: fix build; regenerate api.txt with fixed signatures 2012-09-18 22:04:07 -07:00
doc go spec: arguments for append may overlap 2012-09-28 15:55:38 -07:00
include src: Add support for 64-bit version of Plan 9 2012-08-31 13:21:13 -04:00
lib codereview: use subprocess.call() instead of os.spawnvp() for portability 2012-09-27 01:50:59 +08:00
misc misc/cgo: prepare for 64-bit ints 2012-09-24 14:58:45 -04:00
src cmd/5g: avoid temporary during constant binary op 2012-10-02 08:12:39 +10:00
test test/fixedbugs: forgotten test cases for issues 3907 and 4156. 2012-09-30 10:35:09 +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
favicon.ico add a favicon plus a couple of hi-res versions of gordon 2009-10-26 10:13:07 -07:00
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.