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Nick Craig-Wood eae09a59a0 math/big: Optimise ARM assembler Tweak the ARM assembler to improve its performance. * Use TEQ instead of CMP which preserves the carry flag. This means we can avoid saving and restoring CPSR which is very slow. * Use conditional instructions to read the value of the carry flag. * Use 3 argument ARM instructions to save instructions * Improve scheduling for MOVW instructions (LDR) * Use RSB constant to save an instruction in bitLen Results of -test.bench 'VV\|VW\|VU\|WW\|Bit' -test.benchtime 3s on Samsung Exynos5 Chromebook. There are a few small regressions in the benchmarks which I believe to be noise, perhaps due to different cacheline alignment. The changes to bitLen are apparently no faster, however less instructions means less I-cache usage which is a win. I suspect it will be a win on older ARM processors. benchmark old ns/op new ns/op delta BenchmarkAddVV_1 48 14 -70.84% BenchmarkAddVV_2 87 17 -80.25% BenchmarkAddVV_3 126 20 -83.97% BenchmarkAddVV_4 165 23 -86.00% BenchmarkAddVV_5 204 26 -87.21% BenchmarkAddVV_1e1 399 41 -89.72% BenchmarkAddVV_1e2 3921 315 -91.97% BenchmarkAddVV_1e3 39085 2972 -92.40% BenchmarkAddVV_1e4 390330 29623 -92.41% BenchmarkAddVV_1e5 3935366 343431 -91.27% BenchmarkAddVW_1 20 10 -49.04% BenchmarkAddVW_2 60 14 -76.53% BenchmarkAddVW_3 99 16 -83.38% BenchmarkAddVW_4 140 18 -86.50% BenchmarkAddVW_5 179 21 -88.04% BenchmarkAddVW_1e1 376 33 -91.20% BenchmarkAddVW_1e2 3933 256 -93.49% BenchmarkAddVW_1e3 39630 2378 -94.00% BenchmarkAddVW_1e4 396218 23623 -94.04% BenchmarkAddVW_1e5 3972901 238403 -94.00% BenchmarkAddMulVVW_1 11 11 -4.27% BenchmarkAddMulVVW_2 15 15 +0.00% BenchmarkAddMulVVW_3 18 19 +4.37% BenchmarkAddMulVVW_4 21 21 +4.29% BenchmarkAddMulVVW_5 24 24 -0.82% BenchmarkAddMulVVW_1e1 40 39 -2.70% BenchmarkAddMulVVW_1e2 329 326 -0.91% BenchmarkAddMulVVW_1e3 3200 3098 -3.19% BenchmarkAddMulVVW_1e4 38457 40013 +4.05% BenchmarkAddMulVVW_1e5 461880 428580 -7.21% BenchmarkBitLen0 5 5 -0.19% BenchmarkBitLen1 5 5 +0.00% BenchmarkBitLen2 5 5 -0.56% BenchmarkBitLen3 5 5 +0.38% BenchmarkBitLen4 5 5 +0.19% BenchmarkBitLen5 5 5 +0.56% BenchmarkBitLen8 5 5 -0.19% BenchmarkBitLen9 5 5 -0.56% BenchmarkBitLen16 5 5 -0.19% BenchmarkBitLen17 5 5 -0.37% BenchmarkBitLen31 5 5 -1.30% BenchmarkBitset 72 70 -2.49% BenchmarkBitsetNeg 1584 396 -75.00% BenchmarkBitsetOrig 1990 1980 -0.50% BenchmarkBitsetNegOrig 4031 2877 -28.63% benchmark old MB/s new MB/s speedup BenchmarkAddVV_1 657.71 2251.28 3.42x BenchmarkAddVV_2 730.65 3700.37 5.06x BenchmarkAddVV_3 757.29 4754.30 6.28x BenchmarkAddVV_4 772.95 5541.58 7.17x BenchmarkAddVV_5 781.30 6125.59 7.84x BenchmarkAddVV_1e1 800.33 7814.14 9.76x BenchmarkAddVV_1e2 815.98 10129.62 12.41x BenchmarkAddVV_1e3 818.73 10767.07 13.15x BenchmarkAddVV_1e4 819.82 10802.12 13.18x BenchmarkAddVV_1e5 813.14 9317.73 11.46x BenchmarkAddVW_1 1539.56 3006.13 1.95x BenchmarkAddVW_2 1057.66 4502.20 4.26x BenchmarkAddVW_3 960.67 5797.65 6.04x BenchmarkAddVW_4 913.19 6776.86 7.42x BenchmarkAddVW_5 891.72 7467.82 8.37x BenchmarkAddVW_1e1 850.12 9681.85 11.39x BenchmarkAddVW_1e2 813.48 12494.27 15.36x BenchmarkAddVW_1e3 807.45 13451.80 16.66x BenchmarkAddVW_1e4 807.64 13545.64 16.77x BenchmarkAddVW_1e5 805.46 13422.64 16.66x BenchmarkAddMulVVW_1 2727.29 2847.66 1.04x BenchmarkAddMulVVW_2 4162.30 4158.69 1.00x BenchmarkAddMulVVW_3 5236.91 5015.98 0.96x BenchmarkAddMulVVW_4 6090.27 5837.52 0.96x BenchmarkAddMulVVW_5 6549.86 6598.60 1.01x BenchmarkAddMulVVW_1e1 7850.72 8068.00 1.03x BenchmarkAddMulVVW_1e2 9724.38 9794.40 1.01x BenchmarkAddMulVVW_1e3 9997.18 10328.58 1.03x BenchmarkAddMulVVW_1e4 8320.88 7997.39 0.96x BenchmarkAddMulVVW_1e5 6928.20 7466.50 1.08x LGTM=gri R=golang-codereviews, dave, gri CC=golang-codereviews https://golang.org/cl/61290043		2014-02-13 16:19:38 -08:00
api	api: update next.txt	2014-02-11 19:37:36 -05:00
doc	cmd/go, go/build: support .m files	2014-02-13 10:11:44 -08:00
include	lib9: enable on Plan 9	2014-02-13 20:06:41 +01:00
lib	codereview: warn about 'hg upload' not uploading	2014-02-13 05:06:46 +00:00
misc	runtime: more precise mprof sampling	2014-02-12 22:36:45 +04:00
src	math/big: Optimise ARM assembler	2014-02-13 16:19:38 -08:00
test	cmd/gc: for loop init statement misanalyzed by escape analysis	2014-02-13 19:04:43 +00:00
.hgignore	lib9: enable on Plan 9	2014-02-13 20:06:41 +01:00
.hgtags	tag go1.2	2013-12-02 09:06:41 +11:00
AUTHORS	A+C: Mikhail Panchenko (individual CLA)	2014-02-13 15:34:30 +11:00
CONTRIBUTORS	A+C: Mikhail Panchenko (individual CLA)	2014-02-13 15:34:30 +11:00
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	README: Fix installation instructions	2013-11-20 13:47:37 -08:00
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-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.