cmd/internal/obj/arm64: simplify ADD and SUB
Currently "ADD $0x123456, Rs, Rd" will load pre-stored 0x123456
from the constant pool and use it for the addition. Total 12 bytes
are cost. And so does SUB.
This CL breaks it to "ADD 0x123000, Rs, Rd" + "ADD 0x000456, Rd, Rd".
Both "0x123000" and "0x000456" can be directly encoded into the
instruction binary code. So 4 bytes are saved.
1. The total size of pkg/android_arm64 decreases about 0.3KB.
2. The go1 benchmark show little regression (excluding noise).
name old time/op new time/op delta
BinaryTree17-4 15.9s ± 0% 15.9s ± 1% +0.10% (p=0.044 n=29+29)
Fannkuch11-4 8.72s ± 0% 8.75s ± 0% +0.34% (p=0.000 n=30+24)
FmtFprintfEmpty-4 173ns ± 0% 173ns ± 0% ~ (all equal)
FmtFprintfString-4 368ns ± 0% 368ns ± 0% ~ (p=0.593 n=30+30)
FmtFprintfInt-4 417ns ± 0% 417ns ± 0% ~ (all equal)
FmtFprintfIntInt-4 673ns ± 0% 661ns ± 1% -1.70% (p=0.000 n=30+30)
FmtFprintfPrefixedInt-4 805ns ± 0% 805ns ± 0% +0.10% (p=0.011 n=30+30)
FmtFprintfFloat-4 1.09µs ± 0% 1.09µs ± 0% ~ (p=0.125 n=30+29)
FmtManyArgs-4 2.68µs ± 0% 2.68µs ± 0% +0.07% (p=0.004 n=30+30)
GobDecode-4 32.9ms ± 0% 33.2ms ± 1% +1.07% (p=0.000 n=29+29)
GobEncode-4 29.5ms ± 0% 29.6ms ± 0% +0.26% (p=0.000 n=28+28)
Gzip-4 1.38s ± 1% 1.35s ± 3% -1.94% (p=0.000 n=28+30)
Gunzip-4 139ms ± 0% 139ms ± 0% +0.10% (p=0.000 n=28+29)
HTTPClientServer-4 745µs ± 5% 742µs ± 3% ~ (p=0.405 n=28+29)
JSONEncode-4 49.5ms ± 1% 49.9ms ± 0% +0.89% (p=0.000 n=30+30)
JSONDecode-4 264ms ± 1% 264ms ± 0% +0.25% (p=0.001 n=30+30)
Mandelbrot200-4 16.6ms ± 0% 16.6ms ± 0% ~ (p=0.507 n=29+29)
GoParse-4 15.9ms ± 0% 16.0ms ± 1% +0.91% (p=0.002 n=23+30)
RegexpMatchEasy0_32-4 379ns ± 0% 379ns ± 0% ~ (all equal)
RegexpMatchEasy0_1K-4 1.31µs ± 0% 1.31µs ± 0% +0.09% (p=0.008 n=27+30)
RegexpMatchEasy1_32-4 357ns ± 0% 358ns ± 0% +0.28% (p=0.000 n=28+29)
RegexpMatchEasy1_1K-4 2.04µs ± 0% 2.04µs ± 0% ~ (p=0.850 n=30+30)
RegexpMatchMedium_32-4 587ns ± 0% 589ns ± 0% +0.33% (p=0.000 n=30+30)
RegexpMatchMedium_1K-4 162µs ± 0% 163µs ± 0% ~ (p=0.351 n=30+29)
RegexpMatchHard_32-4 9.54µs ± 0% 9.60µs ± 0% +0.59% (p=0.000 n=28+30)
RegexpMatchHard_1K-4 287µs ± 0% 287µs ± 0% +0.11% (p=0.000 n=26+29)
Revcomp-4 2.50s ± 0% 2.50s ± 0% -0.13% (p=0.012 n=28+27)
Template-4 312ms ± 1% 312ms ± 1% +0.20% (p=0.015 n=27+30)
TimeParse-4 1.68µs ± 0% 1.68µs ± 0% -0.35% (p=0.000 n=30+30)
TimeFormat-4 1.66µs ± 0% 1.64µs ± 0% -1.20% (p=0.000 n=25+29)
[Geo mean] 246µs 246µs -0.00%
name old speed new speed delta
GobDecode-4 23.3MB/s ± 0% 23.1MB/s ± 1% -1.05% (p=0.000 n=29+29)
GobEncode-4 26.0MB/s ± 0% 25.9MB/s ± 0% -0.25% (p=0.000 n=29+28)
Gzip-4 14.1MB/s ± 1% 14.4MB/s ± 3% +1.94% (p=0.000 n=27+30)
Gunzip-4 139MB/s ± 0% 139MB/s ± 0% -0.10% (p=0.000 n=28+29)
JSONEncode-4 39.2MB/s ± 1% 38.9MB/s ± 0% -0.88% (p=0.000 n=30+30)
JSONDecode-4 7.37MB/s ± 0% 7.35MB/s ± 0% -0.26% (p=0.001 n=30+30)
GoParse-4 3.65MB/s ± 0% 3.62MB/s ± 1% -0.86% (p=0.001 n=23+30)
RegexpMatchEasy0_32-4 84.3MB/s ± 0% 84.3MB/s ± 0% ~ (p=0.126 n=27+26)
RegexpMatchEasy0_1K-4 784MB/s ± 0% 783MB/s ± 0% -0.10% (p=0.003 n=27+30)
RegexpMatchEasy1_32-4 89.5MB/s ± 0% 89.3MB/s ± 0% -0.20% (p=0.000 n=27+29)
RegexpMatchEasy1_1K-4 502MB/s ± 0% 502MB/s ± 0% ~ (p=0.858 n=30+28)
RegexpMatchMedium_32-4 1.70MB/s ± 0% 1.70MB/s ± 0% -0.25% (p=0.000 n=30+30)
RegexpMatchMedium_1K-4 6.30MB/s ± 0% 6.30MB/s ± 0% ~ (all equal)
RegexpMatchHard_32-4 3.35MB/s ± 0% 3.33MB/s ± 0% -0.47% (p=0.000 n=30+30)
RegexpMatchHard_1K-4 3.57MB/s ± 0% 3.56MB/s ± 0% -0.20% (p=0.000 n=27+30)
Revcomp-4 102MB/s ± 0% 102MB/s ± 0% +0.14% (p=0.008 n=28+28)
Template-4 6.23MB/s ± 0% 6.21MB/s ± 1% -0.21% (p=0.009 n=21+30)
[Geo mean] 24.1MB/s 24.0MB/s -0.16%
Change-Id: Ifcef3edb667540e2d86e586c23afcfbc2cf1340b
Reviewed-on: https://go-review.googlesource.com/c/134536
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>