cmd/compile: optimize ARM's comparision
Since MULA&MULS cost more CPU cycles than MUL, so
MUL Rx, Ry, Rd
CMP Ra, Rd
cost less cycles than
MULA Rx, Ry, Ra, Rd
CMP $0, Rd
This CL implement that optimization, and the GobEncode-4 of the go1 benchmark
got a little improvement, while other cases got little impact (noise excluded).
name old time/op new time/op delta
BinaryTree17-4 25.2s ± 1% 25.2s ± 0% ~ (p=0.420 n=30+29)
Fannkuch11-4 13.3s ± 0% 13.3s ± 0% +0.03% (p=0.003 n=27+30)
FmtFprintfEmpty-4 406ns ± 0% 405ns ± 0% ~ (p=0.309 n=30+30)
FmtFprintfString-4 672ns ± 0% 670ns ± 0% -0.32% (p=0.000 n=29+29)
FmtFprintfInt-4 717ns ± 0% 714ns ± 0% -0.42% (p=0.000 n=27+22)
FmtFprintfIntInt-4 1.07µs ± 0% 1.07µs ± 0% +0.11% (p=0.000 n=19+30)
FmtFprintfPrefixedInt-4 1.12µs ± 0% 1.12µs ± 0% -0.43% (p=0.000 n=23+30)
FmtFprintfFloat-4 2.25µs ± 0% 2.25µs ± 0% ~ (p=0.509 n=29+29)
FmtManyArgs-4 4.01µs ± 1% 4.00µs ± 0% -0.35% (p=0.000 n=30+30)
GobDecode-4 53.6ms ± 4% 51.9ms ± 2% -3.17% (p=0.000 n=30+30)
GobEncode-4 51.1ms ± 2% 50.6ms ± 2% -0.98% (p=0.000 n=30+30)
Gzip-4 2.61s ± 0% 2.61s ± 0% ~ (p=0.504 n=30+30)
Gunzip-4 312ms ± 0% 312ms ± 0% ~ (p=0.866 n=30+30)
HTTPClientServer-4 977µs ± 7% 974µs ± 8% ~ (p=0.804 n=30+29)
JSONEncode-4 127ms ± 1% 125ms ± 2% -1.88% (p=0.000 n=29+29)
JSONDecode-4 435ms ± 3% 431ms ± 2% -0.80% (p=0.005 n=30+30)
Mandelbrot200-4 18.4ms ± 0% 18.4ms ± 0% -0.02% (p=0.006 n=29+25)
GoParse-4 22.4ms ± 0% 22.4ms ± 0% ~ (p=0.105 n=27+29)
RegexpMatchEasy0_32-4 753ns ± 0% 753ns ± 0% ~ (all equal)
RegexpMatchEasy0_1K-4 4.32µs ± 0% 4.32µs ± 0% ~ (p=0.554 n=29+28)
RegexpMatchEasy1_32-4 788ns ± 0% 788ns ± 0% ~ (all equal)
RegexpMatchEasy1_1K-4 5.54µs ± 0% 5.55µs ± 0% +0.03% (p=0.013 n=29+30)
RegexpMatchMedium_32-4 1.08µs ± 0% 1.08µs ± 0% ~ (p=0.443 n=28+28)
RegexpMatchMedium_1K-4 258µs ± 0% 258µs ± 0% ~ (p=0.932 n=30+28)
RegexpMatchHard_32-4 14.8µs ± 0% 14.8µs ± 0% -0.06% (p=0.021 n=30+30)
RegexpMatchHard_1K-4 442µs ± 0% 442µs ± 0% ~ (p=0.554 n=29+30)
Revcomp-4 41.7ms ± 1% 41.7ms ± 1% ~ (p=0.763 n=28+30)
Template-4 528ms ± 1% 528ms ± 0% ~ (p=0.072 n=30+29)
TimeParse-4 3.31µs ± 0% 3.31µs ± 0% ~ (p=0.215 n=30+30)
TimeFormat-4 6.07µs ± 0% 6.07µs ± 0% ~ (p=0.733 n=30+30)
[Geo mean] 386µs 385µs -0.29%
name old speed new speed delta
GobDecode-4 14.3MB/s ± 4% 14.8MB/s ± 2% +3.23% (p=0.000 n=30+30)
GobEncode-4 15.0MB/s ± 2% 15.2MB/s ± 2% +0.99% (p=0.000 n=30+30)
Gzip-4 7.44MB/s ± 0% 7.44MB/s ± 0% ~ (p=0.328 n=29+30)
Gunzip-4 62.2MB/s ± 0% 62.2MB/s ± 0% ~ (p=0.905 n=30+30)
JSONEncode-4 15.2MB/s ± 1% 15.5MB/s ± 2% +1.93% (p=0.000 n=29+29)
JSONDecode-4 4.46MB/s ± 3% 4.50MB/s ± 2% +0.79% (p=0.007 n=30+30)
GoParse-4 2.58MB/s ± 1% 2.58MB/s ± 1% ~ (p=0.223 n=29+30)
RegexpMatchEasy0_32-4 42.5MB/s ± 0% 42.5MB/s ± 0% ~ (p=0.964 n=30+30)
RegexpMatchEasy0_1K-4 237MB/s ± 0% 237MB/s ± 0% ~ (p=0.392 n=29+28)
RegexpMatchEasy1_32-4 40.6MB/s ± 0% 40.6MB/s ± 0% ~ (p=0.974 n=30+29)
RegexpMatchEasy1_1K-4 185MB/s ± 0% 185MB/s ± 0% -0.03% (p=0.012 n=29+30)
RegexpMatchMedium_32-4 920kB/s ± 0% 920kB/s ± 0% ~ (all equal)
RegexpMatchMedium_1K-4 3.97MB/s ± 0% 3.97MB/s ± 0% ~ (all equal)
RegexpMatchHard_32-4 2.17MB/s ± 0% 2.17MB/s ± 0% +0.18% (p=0.000 n=30+28)
RegexpMatchHard_1K-4 2.32MB/s ± 0% 2.32MB/s ± 0% ~ (all equal)
Revcomp-4 61.0MB/s ± 1% 61.0MB/s ± 1% ~ (p=0.744 n=28+30)
Template-4 3.68MB/s ± 1% 3.67MB/s ± 0% ~ (p=0.147 n=30+29)
[Geo mean] 12.7MB/s 12.7MB/s +0.41%
Change-Id: Ic6053c350c94e9bf57db16542e1370b848155342
Reviewed-on: https://go-review.googlesource.com/129535
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>