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2899c3e8cb
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Ben Shi 2899c3e8cb cmd/compile: optimize ARM code with NMULF/NMULD 
NMULF and NMULD are efficient FP instructions, and the go compiler can
use them to generate better code.

The benchmark tests of my patch did not show general change, but big
improvement in special cases.

1.A special test case improved 12.6%.
https://github.com/benshi001/ugo1/blob/master/fpmul_test.go
name                     old time/op    new time/op    delta
FPMul-4                     398µs ± 1%     348µs ± 1%  -12.64%  (p=0.000 n=40+40)

2. the compilecmp test showed little change.
name        old time/op       new time/op       delta
Template          2.30s ± 1%        2.31s ± 1%    ~     (p=0.754 n=17+19)
Unicode           1.31s ± 3%        1.32s ± 5%    ~     (p=0.265 n=20+20)
GoTypes           7.73s ± 2%        7.73s ± 1%    ~     (p=0.925 n=20+20)
Compiler          37.0s ± 1%        37.3s ± 2%  +0.79%  (p=0.002 n=19+20)
SSA               83.8s ± 4%        83.5s ± 2%    ~     (p=0.964 n=20+17)
Flate             1.43s ± 2%        1.44s ± 1%    ~     (p=0.602 n=20+20)
GoParser          1.82s ± 2%        1.81s ± 2%    ~     (p=0.141 n=19+20)
Reflect           5.08s ± 2%        5.08s ± 3%    ~     (p=0.835 n=20+19)
Tar               2.36s ± 1%        2.35s ± 1%    ~     (p=0.195 n=18+17)
XML               2.57s ± 2%        2.56s ± 1%    ~     (p=0.283 n=20+17)
[Geo mean]        4.74s             4.75s       +0.05%

name        old user-time/op  new user-time/op  delta
Template          2.75s ± 2%        2.75s ± 0%    ~     (p=0.620 n=20+15)
Unicode           1.59s ± 4%        1.60s ± 4%    ~     (p=0.479 n=20+19)
GoTypes           9.48s ± 1%        9.47s ± 1%    ~     (p=0.743 n=20+20)
Compiler          45.7s ± 1%        45.7s ± 1%    ~     (p=0.482 n=19+20)
SSA                109s ± 1%         109s ± 2%    ~     (p=0.800 n=18+20)
Flate             1.67s ± 3%        1.67s ± 3%    ~     (p=0.598 n=19+18)
GoParser          2.15s ± 4%        2.13s ± 3%    ~     (p=0.153 n=20+20)
Reflect           5.95s ± 2%        5.95s ± 2%    ~     (p=0.961 n=19+20)
Tar               2.93s ± 2%        2.92s ± 3%    ~     (p=0.242 n=20+19)
XML               3.02s ± 3%        3.04s ± 3%    ~     (p=0.233 n=19+18)
[Geo mean]        5.74s             5.74s       -0.04%

name        old text-bytes    new text-bytes    delta
HelloSize         588kB ± 0%        588kB ± 0%    ~     (all equal)

name        old data-bytes    new data-bytes    delta
HelloSize        5.46kB ± 0%       5.46kB ± 0%    ~     (all equal)

name        old bss-bytes     new bss-bytes     delta
HelloSize        72.9kB ± 0%       72.9kB ± 0%    ~     (all equal)

name        old exe-bytes     new exe-bytes     delta
HelloSize        1.03MB ± 0%       1.03MB ± 0%    ~     (all equal)

3. The go1 benchmark showed little change in total.
name                     old time/op    new time/op    delta
BinaryTree17-4              41.8s ± 1%     41.8s ± 1%    ~     (p=0.388 n=40+39)
Fannkuch11-4                24.1s ± 1%     24.1s ± 1%    ~     (p=0.077 n=40+40)
FmtFprintfEmpty-4           834ns ± 1%     831ns ± 1%  -0.31%  (p=0.002 n=40+37)
FmtFprintfString-4         1.34µs ± 1%    1.34µs ± 0%    ~     (p=0.387 n=40+40)
FmtFprintfInt-4            1.44µs ± 1%    1.44µs ± 1%    ~     (p=0.421 n=40+40)
FmtFprintfIntInt-4         2.09µs ± 0%    2.09µs ± 1%    ~     (p=0.589 n=40+39)
FmtFprintfPrefixedInt-4    2.32µs ± 1%    2.33µs ± 1%  +0.15%  (p=0.001 n=40+40)
FmtFprintfFloat-4          4.51µs ± 0%    4.44µs ± 1%  -1.50%  (p=0.000 n=40+40)
FmtManyArgs-4              7.94µs ± 0%    7.97µs ± 0%  +0.36%  (p=0.001 n=32+40)
GobDecode-4                 104ms ± 1%     102ms ± 2%  -1.27%  (p=0.000 n=39+37)
GobEncode-4                90.5ms ± 1%    90.9ms ± 2%  +0.40%  (p=0.006 n=37+40)
Gzip-4                      4.10s ± 2%     4.08s ± 1%  -0.30%  (p=0.004 n=40+40)
Gunzip-4                    603ms ± 0%     602ms ± 1%    ~     (p=0.303 n=37+40)
HTTPClientServer-4          672µs ± 3%     658µs ± 2%  -2.08%  (p=0.000 n=39+37)
JSONEncode-4                238ms ± 1%     239ms ± 0%  +0.26%  (p=0.001 n=40+25)
JSONDecode-4                884ms ± 1%     885ms ± 1%  +0.16%  (p=0.012 n=40+40)
Mandelbrot200-4            49.3ms ± 0%    49.3ms ± 0%    ~     (p=0.588 n=40+38)
GoParse-4                  46.3ms ± 1%    46.4ms ± 2%    ~     (p=0.487 n=40+40)
RegexpMatchEasy0_32-4      1.28µs ± 1%    1.28µs ± 0%  +0.12%  (p=0.003 n=40+40)
RegexpMatchEasy0_1K-4      7.78µs ± 5%    7.78µs ± 4%    ~     (p=0.825 n=40+40)
RegexpMatchEasy1_32-4      1.29µs ± 1%    1.29µs ± 0%    ~     (p=0.659 n=40+40)
RegexpMatchEasy1_1K-4      10.3µs ± 3%    10.4µs ± 2%    ~     (p=0.266 n=40+40)
RegexpMatchMedium_32-4     2.05µs ± 1%    2.05µs ± 0%  -0.18%  (p=0.002 n=40+28)
RegexpMatchMedium_1K-4      533µs ± 1%     534µs ± 1%    ~     (p=0.397 n=37+40)
RegexpMatchHard_32-4       28.9µs ± 1%    28.9µs ± 1%  -0.22%  (p=0.002 n=40+40)
RegexpMatchHard_1K-4        868µs ± 1%     870µs ± 1%  +0.21%  (p=0.015 n=40+40)
Revcomp-4                  67.3ms ± 1%    67.2ms ± 2%    ~     (p=0.262 n=38+39)
Template-4                  1.07s ± 1%     1.07s ± 1%    ~     (p=0.276 n=40+40)
TimeParse-4                7.16µs ± 1%    7.16µs ± 1%    ~     (p=0.610 n=39+40)
TimeFormat-4               13.3µs ± 1%    13.3µs ± 1%    ~     (p=0.617 n=38+40)
[Geo mean]                  720µs          719µs       -0.13%

name                     old speed      new speed      delta
GobDecode-4              7.39MB/s ± 1%  7.49MB/s ± 2%  +1.25%  (p=0.000 n=39+38)
GobEncode-4              8.48MB/s ± 1%  8.45MB/s ± 2%  -0.40%  (p=0.005 n=37+40)
Gzip-4                   4.74MB/s ± 2%  4.75MB/s ± 1%  +0.30%  (p=0.018 n=40+40)
Gunzip-4                 32.2MB/s ± 0%  32.2MB/s ± 1%    ~     (p=0.272 n=36+40)
JSONEncode-4             8.15MB/s ± 1%  8.13MB/s ± 0%  -0.26%  (p=0.003 n=40+25)
JSONDecode-4             2.19MB/s ± 1%  2.19MB/s ± 1%    ~     (p=0.676 n=40+40)
GoParse-4                1.25MB/s ± 2%  1.25MB/s ± 2%    ~     (p=0.823 n=40+40)
RegexpMatchEasy0_32-4    25.1MB/s ± 1%  25.1MB/s ± 0%  -0.12%  (p=0.006 n=40+40)
RegexpMatchEasy0_1K-4     132MB/s ± 5%   132MB/s ± 5%    ~     (p=0.821 n=40+40)
RegexpMatchEasy1_32-4    24.7MB/s ± 1%  24.7MB/s ± 0%    ~     (p=0.630 n=40+40)
RegexpMatchEasy1_1K-4    99.1MB/s ± 3%  98.8MB/s ± 2%    ~     (p=0.268 n=40+40)
RegexpMatchMedium_32-4    487kB/s ± 2%   490kB/s ± 0%  +0.51%  (p=0.001 n=40+40)
RegexpMatchMedium_1K-4   1.92MB/s ± 1%  1.92MB/s ± 1%    ~     (p=0.208 n=39+40)
RegexpMatchHard_32-4     1.11MB/s ± 1%  1.11MB/s ± 0%  +0.36%  (p=0.000 n=40+33)
RegexpMatchHard_1K-4     1.18MB/s ± 1%  1.18MB/s ± 1%    ~     (p=0.207 n=40+37)
Revcomp-4                37.8MB/s ± 1%  37.8MB/s ± 2%    ~     (p=0.276 n=38+39)
Template-4               1.82MB/s ± 1%  1.81MB/s ± 1%    ~     (p=0.122 n=38+40)
[Geo mean]               6.81MB/s       6.81MB/s       +0.06%

fixes #19843

Change-Id: Ief3a0c2b15f59d40c7b40f2784eeb71196685b59
Reviewed-on: https://go-review.googlesource.com/61150
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-09-11 13:10:33 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api doc, api: add syscall.SysProcAttr.AmbientCaps change to 1.9 notes, API 2017-06-29 03:29:46 +00:00
doc doc: fix typo in the diagnostics guide 2017-09-11 07:54:34 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc misc/cgo/testcshared: actually run test executable on android 2017-09-11 09:22:44 +00:00
src cmd/compile: optimize ARM code with NMULF/NMULD 2017-09-11 13:10:33 +00:00
test test: add test case that gccgo crashed on 2017-09-11 06:03:39 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
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