cmd/internal/obj/arm64: reclassify 32-bit/64-bit constants
Current assembler saves constants in Offset which type is int64, causing 32-bit constants have a incorrect class. This CL reclassifies constants when opcodes are 32-bit variant, like MOVW, ANDW and ADDW, etc. Besides, this CL encodes some constants of ADDCON class as MOVs instructions. This CL changes the assembler behavior as follows. 1. go assembler ADDW $MOVCON, Rn, Rd previous version: MOVD $MOVCON, Rtmp; ADDW Rtmp, Rn, Rd current version: MOVW $MOVCON, Rtmp; ADDW Rtmp, Rn, Rd 2. go assembly MOVW $0xaaaaffff, R1 previous version: treats $0xaaaaffff as VCON, encodes it as MOVW 0x994, R1 (loads it from pool). current version: treats $0xaaaaffff as MOVCON, and encodes it into MOVW instructions. 3. go assembly MOVD $0x210000, R1 previous version: treats $0x210000 as ADDCON, loads it from pool current version: treats $0x210000 as MOVCON, and encodes it into MOVD instructions. Add the test cases. 1. Binary size before/after. binary size change pkg/linux_arm64 -1.534KB pkg/tool/linux_arm64 -0.718KB go -0.32KB gofmt no change 2. go1 benchmark result. name old time/op new time/op delta BinaryTree17-8 6.26s ± 1% 6.28s ± 1% ~ (p=0.105 n=10+10) Fannkuch11-8 5.40s ± 0% 5.39s ± 0% -0.29% (p=0.028 n=9+10) FmtFprintfEmpty-8 94.5ns ± 0% 95.0ns ± 0% +0.51% (p=0.000 n=10+9) FmtFprintfString-8 163ns ± 1% 159ns ± 1% -2.06% (p=0.000 n=10+9) FmtFprintfInt-8 200ns ± 1% 196ns ± 1% -1.99% (p=0.000 n=9+10) FmtFprintfIntInt-8 292ns ± 3% 284ns ± 1% -2.87% (p=0.001 n=10+9) FmtFprintfPrefixedInt-8 422ns ± 1% 420ns ± 1% -0.59% (p=0.015 n=10+10) FmtFprintfFloat-8 458ns ± 0% 463ns ± 1% +1.19% (p=0.000 n=9+10) FmtManyArgs-8 1.37µs ± 1% 1.35µs ± 1% -1.85% (p=0.000 n=10+10) GobDecode-8 15.5ms ± 1% 15.3ms ± 1% -1.82% (p=0.000 n=10+10) GobEncode-8 11.7ms ± 5% 11.7ms ± 2% ~ (p=0.549 n=10+9) Gzip-8 622ms ± 0% 624ms ± 0% +0.23% (p=0.000 n=10+9) Gunzip-8 73.6ms ± 0% 73.8ms ± 1% ~ (p=0.077 n=9+9) HTTPClientServer-8 115µs ± 1% 115µs ± 1% ~ (p=0.796 n=10+10) JSONEncode-8 31.1ms ± 2% 28.7ms ± 1% -7.98% (p=0.000 n=10+9) JSONDecode-8 145ms ± 0% 145ms ± 1% ~ (p=0.447 n=9+10) Mandelbrot200-8 9.67ms ± 0% 9.60ms ± 0% -0.76% (p=0.000 n=9+9) GoParse-8 7.56ms ± 1% 7.58ms ± 0% +0.21% (p=0.035 n=10+9) RegexpMatchEasy0_32-8 208ns ±10% 222ns ± 0% ~ (p=0.531 n=10+6) RegexpMatchEasy0_1K-8 699ns ± 4% 694ns ± 4% ~ (p=0.868 n=10+10) RegexpMatchEasy1_32-8 186ns ± 8% 190ns ±12% ~ (p=0.955 n=10+10) RegexpMatchEasy1_1K-8 1.13µs ± 1% 1.05µs ± 2% -6.64% (p=0.000 n=10+10) RegexpMatchMedium_32-8 316ns ± 7% 288ns ± 1% -8.68% (p=0.000 n=10+7) RegexpMatchMedium_1K-8 90.2µs ± 0% 85.5µs ± 2% -5.19% (p=0.000 n=10+10) RegexpMatchHard_32-8 5.53µs ± 0% 3.90µs ± 0% -29.52% (p=0.000 n=10+10) RegexpMatchHard_1K-8 119µs ± 0% 124µs ± 0% +4.29% (p=0.000 n=9+10) Revcomp-8 1.07s ± 0% 1.07s ± 0% ~ (p=0.094 n=9+9) Template-8 162ms ± 1% 160ms ± 2% ~ (p=0.089 n=10+10) TimeParse-8 756ns ± 2% 763ns ± 1% ~ (p=0.158 n=10+10) TimeFormat-8 758ns ± 1% 746ns ± 1% -1.52% (p=0.000 n=10+10) name old speed new speed delta GobDecode-8 49.4MB/s ± 1% 50.3MB/s ± 1% +1.84% (p=0.000 n=10+10) GobEncode-8 65.6MB/s ± 5% 65.4MB/s ± 2% ~ (p=0.549 n=10+9) Gzip-8 31.2MB/s ± 0% 31.1MB/s ± 0% -0.24% (p=0.000 n=9+9) Gunzip-8 264MB/s ± 0% 263MB/s ± 1% ~ (p=0.073 n=9+9) JSONEncode-8 62.3MB/s ± 2% 67.7MB/s ± 1% +8.67% (p=0.000 n=10+9) JSONDecode-8 13.4MB/s ± 0% 13.4MB/s ± 1% ~ (p=0.508 n=9+10) GoParse-8 7.66MB/s ± 1% 7.64MB/s ± 0% -0.23% (p=0.049 n=10+9) RegexpMatchEasy0_32-8 154MB/s ± 9% 143MB/s ± 3% ~ (p=0.303 n=10+7) RegexpMatchEasy0_1K-8 1.46GB/s ± 4% 1.47GB/s ± 4% ~ (p=0.912 n=10+10) RegexpMatchEasy1_32-8 172MB/s ± 9% 170MB/s ±12% ~ (p=0.971 n=10+10) RegexpMatchEasy1_1K-8 908MB/s ± 1% 972MB/s ± 2% +7.12% (p=0.000 n=10+10) RegexpMatchMedium_32-8 3.17MB/s ± 7% 3.46MB/s ± 1% +9.14% (p=0.000 n=10+7) RegexpMatchMedium_1K-8 11.3MB/s ± 0% 12.0MB/s ± 2% +5.51% (p=0.000 n=10+10) RegexpMatchHard_32-8 5.78MB/s ± 0% 8.21MB/s ± 0% +41.93% (p=0.000 n=9+10) RegexpMatchHard_1K-8 8.62MB/s ± 0% 8.27MB/s ± 0% -4.11% (p=0.000 n=9+10) Revcomp-8 237MB/s ± 0% 237MB/s ± 0% ~ (p=0.081 n=9+9) Template-8 12.0MB/s ± 1% 12.1MB/s ± 2% ~ (p=0.072 n=10+10) Change-Id: I080801f520366b42d5f9699954bd33106976a81b Reviewed-on: https://go-review.googlesource.com/c/120661 Run-TryBot: Ben Shi <powerman1st@163.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Cherry Zhang <cherryyz@google.com>
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