cmd/compile: optimize 386's comparison
CMPL/CMPW/CMPB can take a memory operand on 386, and this CL
implements that optimization.
1. The total size of pkg/linux_386 decreases about 45KB, excluding
cmd/compile.
2. The go1 benchmark shows a little improvement.
name old time/op new time/op delta
BinaryTree17-4 3.36s ± 2% 3.37s ± 3% ~ (p=0.537 n=40+40)
Fannkuch11-4 3.59s ± 1% 3.53s ± 2% -1.58% (p=0.000 n=40+40)
FmtFprintfEmpty-4 46.0ns ± 3% 45.8ns ± 3% ~ (p=0.249 n=40+40)
FmtFprintfString-4 80.0ns ± 4% 78.8ns ± 3% -1.49% (p=0.001 n=40+40)
FmtFprintfInt-4 89.7ns ± 2% 90.3ns ± 2% +0.74% (p=0.003 n=40+40)
FmtFprintfIntInt-4 144ns ± 3% 143ns ± 3% -0.95% (p=0.003 n=40+40)
FmtFprintfPrefixedInt-4 181ns ± 4% 180ns ± 2% ~ (p=0.103 n=40+40)
FmtFprintfFloat-4 412ns ± 3% 408ns ± 4% -0.97% (p=0.018 n=40+40)
FmtManyArgs-4 607ns ± 4% 605ns ± 4% ~ (p=0.148 n=40+40)
GobDecode-4 7.19ms ± 4% 7.24ms ± 5% ~ (p=0.340 n=40+40)
GobEncode-4 7.04ms ± 9% 6.99ms ± 9% ~ (p=0.289 n=40+40)
Gzip-4 400ms ± 6% 398ms ± 5% ~ (p=0.168 n=40+40)
Gunzip-4 41.2ms ± 3% 41.7ms ± 3% +1.40% (p=0.001 n=40+40)
HTTPClientServer-4 62.5µs ± 1% 62.1µs ± 2% -0.61% (p=0.000 n=37+37)
JSONEncode-4 20.7ms ± 4% 20.4ms ± 3% -1.60% (p=0.000 n=40+40)
JSONDecode-4 69.4ms ± 4% 69.2ms ± 6% ~ (p=0.177 n=40+40)
Mandelbrot200-4 5.22ms ± 6% 5.21ms ± 3% ~ (p=0.531 n=40+40)
GoParse-4 3.29ms ± 3% 3.28ms ± 3% ~ (p=0.321 n=40+39)
RegexpMatchEasy0_32-4 104ns ± 4% 103ns ± 7% -0.89% (p=0.040 n=40+40)
RegexpMatchEasy0_1K-4 852ns ± 3% 853ns ± 2% ~ (p=0.357 n=40+40)
RegexpMatchEasy1_32-4 113ns ± 8% 113ns ± 3% ~ (p=0.906 n=40+40)
RegexpMatchEasy1_1K-4 1.03µs ± 4% 1.03µs ± 5% ~ (p=0.326 n=40+40)
RegexpMatchMedium_32-4 136ns ± 3% 133ns ± 3% -2.31% (p=0.000 n=40+40)
RegexpMatchMedium_1K-4 44.0µs ± 3% 43.7µs ± 3% ~ (p=0.053 n=40+40)
RegexpMatchHard_32-4 2.27µs ± 3% 2.26µs ± 4% ~ (p=0.391 n=40+40)
RegexpMatchHard_1K-4 68.0µs ± 3% 68.9µs ± 3% +1.28% (p=0.000 n=40+40)
Revcomp-4 1.86s ± 5% 1.86s ± 2% ~ (p=0.950 n=40+40)
Template-4 73.4ms ± 4% 69.9ms ± 7% -4.78% (p=0.000 n=40+40)
TimeParse-4 449ns ± 4% 441ns ± 5% -1.76% (p=0.000 n=40+40)
TimeFormat-4 416ns ± 3% 417ns ± 4% ~ (p=0.304 n=40+40)
[Geo mean] 67.7µs 67.3µs -0.55%
name old speed new speed delta
GobDecode-4 107MB/s ± 4% 106MB/s ± 5% ~ (p=0.336 n=40+40)
GobEncode-4 109MB/s ± 5% 110MB/s ± 9% ~ (p=0.142 n=38+40)
Gzip-4 48.5MB/s ± 5% 48.8MB/s ± 5% ~ (p=0.172 n=40+40)
Gunzip-4 472MB/s ± 3% 465MB/s ± 3% -1.39% (p=0.001 n=40+40)
JSONEncode-4 93.6MB/s ± 4% 95.1MB/s ± 3% +1.61% (p=0.000 n=40+40)
JSONDecode-4 28.0MB/s ± 3% 28.1MB/s ± 6% ~ (p=0.181 n=40+40)
GoParse-4 17.6MB/s ± 3% 17.7MB/s ± 3% ~ (p=0.350 n=40+39)
RegexpMatchEasy0_32-4 308MB/s ± 4% 311MB/s ± 6% +0.96% (p=0.025 n=40+40)
RegexpMatchEasy0_1K-4 1.20GB/s ± 3% 1.20GB/s ± 2% ~ (p=0.317 n=40+40)
RegexpMatchEasy1_32-4 282MB/s ± 7% 282MB/s ± 3% ~ (p=0.516 n=40+40)
RegexpMatchEasy1_1K-4 994MB/s ± 4% 991MB/s ± 5% ~ (p=0.319 n=40+40)
RegexpMatchMedium_32-4 7.31MB/s ± 3% 7.49MB/s ± 3% +2.46% (p=0.000 n=40+40)
RegexpMatchMedium_1K-4 23.3MB/s ± 3% 23.4MB/s ± 3% ~ (p=0.052 n=40+40)
RegexpMatchHard_32-4 14.1MB/s ± 3% 14.1MB/s ± 4% ~ (p=0.391 n=40+40)
RegexpMatchHard_1K-4 15.1MB/s ± 3% 14.9MB/s ± 3% -1.27% (p=0.000 n=40+40)
Revcomp-4 137MB/s ± 5% 137MB/s ± 2% ~ (p=0.942 n=40+40)
Template-4 26.5MB/s ± 4% 27.8MB/s ± 7% +5.03% (p=0.000 n=40+40)
[Geo mean] 78.6MB/s 79.0MB/s +0.57%
Change-Id: Idcacc6881ef57cd7dc33aa87b711282842b72a53
Reviewed-on: https://go-review.googlesource.com/126618
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>