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348275cda6
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Cherry Zhang 348275cda6 cmd/compile: make a copy of Phi input if it is still live 
Register of Phi input is allocated to the Phi. So if the Phi
input is still live after Phi, we may need to use a spill. In
this case, copy the Phi input to a spare register to avoid a
spill.

Originally targeted the code in issue #16187, and this CL
indeed removes the spill, but doesn't seem to help on benchmark
result. It may help in general, though.

On AMD64:
name                      old time/op    new time/op    delta
BinaryTree17-12              2.79s ± 1%     2.76s ± 0%  -1.33%  (p=0.000 n=10+10)
Fannkuch11-12                3.02s ± 0%     3.14s ± 0%  +3.99%  (p=0.000 n=10+10)
FmtFprintfEmpty-12          51.2ns ± 0%    51.4ns ± 3%    ~      (p=0.368 n=8+10)
FmtFprintfString-12          145ns ± 0%     144ns ± 0%  -0.69%    (p=0.000 n=6+9)
FmtFprintfInt-12             127ns ± 1%     124ns ± 1%  -2.79%   (p=0.000 n=10+9)
FmtFprintfIntInt-12          186ns ± 0%     184ns ± 0%  -1.34%   (p=0.000 n=10+9)
FmtFprintfPrefixedInt-12     196ns ± 0%     194ns ± 0%  -0.97%    (p=0.000 n=9+9)
FmtFprintfFloat-12           293ns ± 2%     287ns ± 0%  -2.00%   (p=0.000 n=10+9)
FmtManyArgs-12               847ns ± 1%     829ns ± 0%  -2.17%   (p=0.000 n=10+7)
GobDecode-12                7.17ms ± 0%    7.18ms ± 0%    ~     (p=0.123 n=10+10)
GobEncode-12                6.08ms ± 1%    6.08ms ± 0%    ~      (p=0.497 n=10+9)
Gzip-12                      277ms ± 1%     275ms ± 1%  -0.47%   (p=0.028 n=10+9)
Gunzip-12                   39.1ms ± 2%    38.2ms ± 1%  -2.20%   (p=0.000 n=10+9)
HTTPClientServer-12         90.9µs ± 4%    87.7µs ± 2%  -3.51%   (p=0.001 n=9+10)
JSONEncode-12               17.3ms ± 1%    16.5ms ± 0%  -5.02%    (p=0.000 n=9+9)
JSONDecode-12               54.6ms ± 1%    54.1ms ± 0%  -0.99%    (p=0.000 n=9+9)
Mandelbrot200-12            4.45ms ± 0%    4.45ms ± 0%  -0.02%    (p=0.006 n=8+9)
GoParse-12                  3.44ms ± 0%    3.48ms ± 1%  +0.95%  (p=0.000 n=10+10)
RegexpMatchEasy0_32-12      84.9ns ± 0%    85.0ns ± 0%    ~       (p=0.241 n=8+8)
RegexpMatchEasy0_1K-12       867ns ± 3%     915ns ±11%  +5.55%  (p=0.037 n=10+10)
RegexpMatchEasy1_32-12      82.7ns ± 5%    83.9ns ± 4%    ~      (p=0.161 n=9+10)
RegexpMatchEasy1_1K-12       361ns ± 1%     363ns ± 0%    ~      (p=0.098 n=10+8)
RegexpMatchMedium_32-12      126ns ± 0%     126ns ± 1%    ~      (p=0.549 n=8+10)
RegexpMatchMedium_1K-12     38.8µs ± 0%    39.1µs ± 0%  +0.67%    (p=0.000 n=9+8)
RegexpMatchHard_32-12       1.95µs ± 0%    1.96µs ± 0%  +0.43%    (p=0.000 n=9+9)
RegexpMatchHard_1K-12       59.0µs ± 0%    59.1µs ± 0%  +0.27%   (p=0.000 n=10+9)
Revcomp-12                   436ms ± 1%     431ms ± 1%  -1.19%  (p=0.005 n=10+10)
Template-12                 56.7ms ± 1%    57.1ms ± 1%  +0.71%   (p=0.001 n=10+9)
TimeParse-12                 312ns ± 0%     310ns ± 0%  -0.80%   (p=0.000 n=10+9)
TimeFormat-12                336ns ± 0%     332ns ± 0%  -1.19%    (p=0.000 n=8+7)
[Geo mean]                  59.2µs         58.9µs       -0.42%

On PPC64:
name                     old time/op    new time/op    delta
BinaryTree17-2              4.67s ± 2%     4.71s ± 1%    ~     (p=0.421 n=5+5)
Fannkuch11-2                3.92s ± 1%     3.94s ± 0%  +0.46%  (p=0.032 n=5+5)
FmtFprintfEmpty-2           122ns ± 0%     120ns ± 2%  -1.80%  (p=0.016 n=4+5)
FmtFprintfString-2          305ns ± 1%     299ns ± 1%  -1.84%  (p=0.008 n=5+5)
FmtFprintfInt-2             243ns ± 0%     241ns ± 1%  -0.66%  (p=0.016 n=4+5)
FmtFprintfIntInt-2          361ns ± 1%     356ns ± 1%  -1.49%  (p=0.016 n=5+5)
FmtFprintfPrefixedInt-2     355ns ± 1%     357ns ± 1%    ~     (p=0.333 n=5+5)
FmtFprintfFloat-2           502ns ± 2%     498ns ± 1%    ~     (p=0.151 n=5+5)
FmtManyArgs-2              1.55µs ± 2%    1.59µs ± 1%  +2.52%  (p=0.008 n=5+5)
GobDecode-2                13.0ms ± 1%    13.0ms ± 1%    ~     (p=0.841 n=5+5)
GobEncode-2                11.8ms ± 1%    11.8ms ± 1%    ~     (p=0.690 n=5+5)
Gzip-2                      499ms ± 1%     503ms ± 0%    ~     (p=0.421 n=5+5)
Gunzip-2                   86.5ms ± 0%    86.4ms ± 1%    ~     (p=0.841 n=5+5)
HTTPClientServer-2         68.2µs ± 2%    69.6µs ± 3%    ~     (p=0.151 n=5+5)
JSONEncode-2               39.0ms ± 1%    37.2ms ± 1%  -4.65%  (p=0.008 n=5+5)
JSONDecode-2                122ms ± 1%     126ms ± 1%  +2.63%  (p=0.008 n=5+5)
Mandelbrot200-2            6.08ms ± 1%    5.89ms ± 1%  -3.06%  (p=0.008 n=5+5)
GoParse-2                  5.95ms ± 2%    5.98ms ± 1%    ~     (p=0.421 n=5+5)
RegexpMatchEasy0_32-2       331ns ± 1%     328ns ± 1%    ~     (p=0.056 n=5+5)
RegexpMatchEasy0_1K-2      1.45µs ± 0%    1.47µs ± 0%  +1.13%  (p=0.008 n=5+5)
RegexpMatchEasy1_32-2       359ns ± 0%     353ns ± 0%  -1.84%  (p=0.008 n=5+5)
RegexpMatchEasy1_1K-2      1.79µs ± 0%    1.81µs ± 1%  +1.16%  (p=0.008 n=5+5)
RegexpMatchMedium_32-2      420ns ± 2%     413ns ± 0%  -1.72%  (p=0.008 n=5+5)
RegexpMatchMedium_1K-2     70.2µs ± 1%    69.5µs ± 1%  -1.09%  (p=0.032 n=5+5)
RegexpMatchHard_32-2       3.87µs ± 1%    3.65µs ± 0%  -5.86%  (p=0.008 n=5+5)
RegexpMatchHard_1K-2        111µs ± 0%     105µs ± 0%  -5.49%  (p=0.016 n=5+4)
Revcomp-2                   1.00s ± 1%     1.01s ± 2%    ~     (p=0.151 n=5+5)
Template-2                  113ms ± 1%     113ms ± 2%    ~     (p=0.841 n=5+5)
TimeParse-2                 555ns ± 0%     550ns ± 1%  -0.87%  (p=0.032 n=5+5)
TimeFormat-2                736ns ± 1%     704ns ± 1%  -4.35%  (p=0.008 n=5+5)
[Geo mean]                  120µs          119µs       -0.77%

Reduce "spilled value remains" by 0.6% in cmd/go on AMD64.

Change-Id: If655df343b0f30d1a49ab1ab644f10c698b96f3e
Reviewed-on: https://go-review.googlesource.com/32442
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2016-11-18 13:56:23 +00:00
.github doc: improve issue template 2016-08-29 03:33:28 +00:00
api api, doc: update go1.8.txt and next.txt 2016-11-16 01:19:56 +00:00
doc doc: add FAQ: why no conversion from []T1 to []T2? 2016-11-17 00:18:12 +00:00
lib/time lib/time: update tzdata to 2016i 2016-11-10 19:14:51 +00:00
misc runtime: handle SIGPIPE in c-archive and c-shared programs 2016-11-18 01:19:11 +00:00
src cmd/compile: make a copy of Phi input if it is still live 2016-11-18 13:56:23 +00:00
test test: add test case that failed when built with gccgo 2016-11-15 21:25:44 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore cmd/go: fail with nice error message on bad GOOS/GOARCH pair 2016-05-06 01:18:07 +00:00
AUTHORS A+C: update for Go 1.8 2016-11-10 19:35:02 +00:00
CONTRIBUTING.md doc: use new Gerrit URL and mention our instance in CONTRIBUTING.md 2016-03-09 00:52:42 +00:00
CONTRIBUTORS A+C: update for Go 1.8 2016-11-10 19:35:02 +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: emphasize issue tracker is for bugs/proposals 2015-10-02 18:44:14 +00:00
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