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9732485851
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Ben Shi 9732485851 cmd/compile: optimized ARM code with BFX/BFXU 
BFX&BFXU were introduced in ARMv6T2. A single BFX or BFXU is
more efficiently than a pair of left-shift/right-shift in bit
field extraction.

This patch implements this optimization. And the benchmark tests
show big improvement in special cases and little change in total.

1. There is big improvement in a special test case.
name                     old time/op    new time/op    delta
BFX-4                       665µs ± 1%     595µs ± 0%  -10.61%  (p=0.000 n=20+20)
(The test case: https://github.com/benshi001/ugo1/blob/master/bfx_test.go)

2. The compilecmp benchmark shows no regression.
name        old time/op       new time/op       delta
Template          2.33s ± 2%        2.34s ± 2%    ~     (p=0.356 n=9+10)
Unicode           1.32s ± 2%        1.30s ± 2%    ~     (p=0.139 n=9+8)
GoTypes           7.77s ± 1%        7.76s ± 1%    ~     (p=0.780 n=10+9)
Compiler          37.3s ± 1%        37.1s ± 1%    ~     (p=0.211 n=10+9)
SSA               84.3s ± 2%        84.3s ± 2%    ~     (p=0.842 n=10+9)
Flate             1.45s ± 1%        1.45s ± 3%    ~     (p=0.853 n=10+10)
GoParser          1.83s ± 2%        1.83s ± 2%    ~     (p=0.739 n=10+10)
Reflect           5.08s ± 2%        5.09s ± 2%    ~     (p=0.720 n=9+10)
Tar               2.44s ± 1%        2.44s ± 2%    ~     (p=0.684 n=10+10)
XML               2.62s ± 2%        2.62s ± 2%    ~     (p=0.529 n=10+10)
[Geo mean]        4.80s             4.79s       -0.06%

name        old user-time/op  new user-time/op  delta
Template          2.76s ± 2%        2.75s ± 3%    ~     (p=0.893 n=10+10)
Unicode           1.63s ± 1%        1.60s ± 1%  -2.07%  (p=0.000 n=8+9)
GoTypes           9.54s ± 1%        9.52s ± 1%    ~     (p=0.215 n=10+10)
Compiler          46.0s ± 1%        46.0s ± 1%    ~     (p=0.853 n=10+10)
SSA                110s ± 1%         110s ± 1%    ~     (p=0.838 n=10+10)
Flate             1.69s ± 3%        1.69s ± 5%    ~     (p=0.957 n=10+10)
GoParser          2.15s ± 2%        2.15s ± 2%    ~     (p=0.749 n=10+10)
Reflect           6.03s ± 1%        5.99s ± 2%    ~     (p=0.060 n=9+10)
Tar               3.02s ± 2%        2.99s ± 2%    ~     (p=0.214 n=10+10)
XML               3.10s ± 2%        3.08s ± 2%    ~     (p=0.732 n=9+10)
[Geo mean]        5.82s             5.79s       -0.41%

name        old text-bytes    new text-bytes    delta
HelloSize         589kB ± 0%        589kB ± 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        76.9kB ± 0%       76.9kB ± 0%    ~     (all equal)

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

3. The go1 benchmark shows little change in total. (excluding noise)
name                     old time/op    new time/op    delta
BinaryTree17-4              41.5s ± 1%     41.6s ± 1%    ~     (p=0.373 n=30+26)
Fannkuch11-4                23.6s ± 1%     23.6s ± 1%  +0.28%  (p=0.003 n=29+30)
FmtFprintfEmpty-4           826ns ± 1%     827ns ± 1%    ~     (p=0.155 n=30+30)
FmtFprintfString-4         1.35µs ± 1%    1.35µs ± 1%    ~     (p=0.499 n=30+30)
FmtFprintfInt-4            1.43µs ± 1%    1.41µs ± 1%  -1.19%  (p=0.000 n=30+30)
FmtFprintfIntInt-4         2.15µs ± 1%    2.11µs ± 1%  -1.78%  (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4    2.21µs ± 1%    2.21µs ± 1%    ~     (p=0.881 n=30+30)
FmtFprintfFloat-4          4.41µs ± 1%    4.44µs ± 0%  +0.64%  (p=0.000 n=30+30)
FmtManyArgs-4              8.06µs ± 1%    8.06µs ± 0%    ~     (p=0.871 n=30+30)
GobDecode-4                 103ms ± 1%     104ms ± 2%  +0.54%  (p=0.013 n=28+29)
GobEncode-4                92.4ms ± 1%    92.6ms ± 1%    ~     (p=0.447 n=30+29)
Gzip-4                      4.17s ± 1%     4.06s ± 1%  -2.56%  (p=0.000 n=29+30)
Gunzip-4                    603ms ± 1%     602ms ± 1%    ~     (p=0.423 n=30+30)
HTTPClientServer-4          688µs ± 2%     674µs ± 3%  -2.09%  (p=0.000 n=29+30)
JSONEncode-4                237ms ± 1%     237ms ± 1%    ~     (p=0.061 n=29+30)
JSONDecode-4                907ms ± 1%     910ms ± 1%    ~     (p=0.061 n=30+30)
Mandelbrot200-4            41.7ms ± 0%    41.7ms ± 0%  +0.19%  (p=0.000 n=24+20)
GoParse-4                  45.7ms ± 2%    45.5ms ± 2%  -0.29%  (p=0.005 n=30+30)
RegexpMatchEasy0_32-4      1.27µs ± 0%    1.27µs ± 0%  +0.12%  (p=0.031 n=30+30)
RegexpMatchEasy0_1K-4      7.77µs ± 4%    7.73µs ± 3%    ~     (p=0.169 n=30+30)
RegexpMatchEasy1_32-4      1.29µs ± 1%    1.29µs ± 1%    ~     (p=0.126 n=30+30)
RegexpMatchEasy1_1K-4      10.4µs ± 3%    10.3µs ± 2%  -1.32%  (p=0.004 n=30+29)
RegexpMatchMedium_32-4     2.06µs ± 0%    2.06µs ± 0%    ~     (p=0.071 n=30+30)
RegexpMatchMedium_1K-4      531µs ± 1%     530µs ± 0%    ~     (p=0.121 n=30+23)
RegexpMatchHard_32-4       28.7µs ± 1%    28.6µs ± 1%  -0.21%  (p=0.001 n=30+27)
RegexpMatchHard_1K-4        860µs ± 1%     857µs ± 1%    ~     (p=0.105 n=30+27)
Revcomp-4                  67.3ms ± 2%    67.3ms ± 2%    ~     (p=0.805 n=29+29)
Template-4                  1.08s ± 1%     1.08s ± 1%    ~     (p=0.260 n=30+30)
TimeParse-4                7.04µs ± 0%    7.04µs ± 0%    ~     (p=0.315 n=30+30)
TimeFormat-4               13.2µs ± 1%    13.2µs ± 1%    ~     (p=0.077 n=30+30)
[Geo mean]                  715µs          713µs       -0.30%

name                     old speed      new speed      delta
GobDecode-4              7.42MB/s ± 1%  7.38MB/s ± 2%  -0.54%  (p=0.011 n=28+29)
GobEncode-4              8.30MB/s ± 1%  8.29MB/s ± 1%    ~     (p=0.484 n=30+29)
Gzip-4                   4.65MB/s ± 2%  4.78MB/s ± 1%  +2.73%  (p=0.000 n=30+30)
Gunzip-4                 32.2MB/s ± 1%  32.2MB/s ± 1%    ~     (p=0.357 n=30+30)
JSONEncode-4             8.18MB/s ± 1%  8.19MB/s ± 1%    ~     (p=0.052 n=29+30)
JSONDecode-4             2.14MB/s ± 1%  2.13MB/s ± 1%    ~     (p=0.074 n=30+29)
GoParse-4                1.27MB/s ± 1%  1.27MB/s ± 2%    ~     (p=0.618 n=24+30)
RegexpMatchEasy0_32-4    25.2MB/s ± 0%  25.2MB/s ± 0%  -0.12%  (p=0.031 n=30+30)
RegexpMatchEasy0_1K-4     132MB/s ± 5%   132MB/s ± 2%    ~     (p=0.171 n=30+30)
RegexpMatchEasy1_32-4    24.8MB/s ± 1%  24.9MB/s ± 1%    ~     (p=0.106 n=30+30)
RegexpMatchEasy1_1K-4    98.4MB/s ± 3%  99.6MB/s ± 4%  +1.19%  (p=0.011 n=30+30)
RegexpMatchMedium_32-4    483kB/s ± 1%   484kB/s ± 1%    ~     (p=0.426 n=30+30)
RegexpMatchMedium_1K-4   1.93MB/s ± 1%  1.93MB/s ± 0%    ~     (p=0.157 n=30+17)
RegexpMatchHard_32-4     1.12MB/s ± 1%  1.12MB/s ± 0%  +0.33%  (p=0.001 n=30+24)
RegexpMatchHard_1K-4     1.19MB/s ± 1%  1.19MB/s ± 1%    ~     (p=0.290 n=30+30)
Revcomp-4                37.8MB/s ± 2%  37.8MB/s ± 1%    ~     (p=0.815 n=29+29)
Template-4               1.80MB/s ± 1%  1.80MB/s ± 1%    ~     (p=0.586 n=30+30)
[Geo mean]               6.80MB/s       6.81MB/s       +0.25%

fixes #20966

Change-Id: Idb5567bbe988c875315b8c98c128957cd474ccc5
Reviewed-on: https://go-review.googlesource.com/64950
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
2017-09-21 12:41:04 +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 spec: state which predeclared types are defined or alias types (clarification) 2017-09-19 14:33:25 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc cmd/compile: fix large global variables in -linkshared mode on s390x 2017-09-20 20:20:46 +00:00
src cmd/compile: optimized ARM code with BFX/BFXU 2017-09-21 12:41:04 +00:00
test cmd/compile: refactor onebitwalktype1 2017-09-20 18:11:52 +00:00
.gitattributes
.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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