3c8b824453
A pair of MUL/NEG instructions can be combined to a single MNEG on ARM64. This CL implements this optimization. 1. A special test case gets big improvement. (https://github.com/benshi001/ugo1/blob/master/mneg_test.go) name old time/op new time/op delta MNEG-4 315µs ± 0% 260µs ± 0% -17.39% (p=0.000 n=24+25) 2. There is little change in the go1 benchmark, excluding noise. name old time/op new time/op delta BinaryTree17-4 42.2s ± 2% 41.9s ± 2% -0.82% (p=0.001 n=30+26) Fannkuch11-4 32.9s ± 0% 32.9s ± 0% -0.01% (p=0.006 n=20+26) FmtFprintfEmpty-4 541ns ± 3% 534ns ± 0% -1.24% (p=0.003 n=30+26) FmtFprintfString-4 1.09µs ± 0% 1.10µs ± 3% ~ (p=0.142 n=23+30) FmtFprintfInt-4 1.14µs ± 0% 1.14µs ± 0% ~ (p=0.435 n=24+24) FmtFprintfIntInt-4 1.76µs ± 0% 1.76µs ± 0% ~ (p=0.508 n=24+26) FmtFprintfPrefixedInt-4 2.20µs ± 3% 2.17µs ± 0% -1.10% (p=0.017 n=30+24) FmtFprintfFloat-4 3.28µs ± 0% 3.28µs ± 0% ~ (p=0.579 n=24+24) FmtManyArgs-4 7.30µs ± 0% 7.30µs ± 0% ~ (p=0.662 n=26+27) GobDecode-4 94.8ms ± 0% 94.8ms ± 0% +0.07% (p=0.010 n=25+23) GobEncode-4 80.9ms ± 4% 80.6ms ± 4% ~ (p=0.901 n=30+30) Gzip-4 4.45s ± 0% 4.49s ± 0% +0.98% (p=0.000 n=25+24) Gunzip-4 450ms ± 3% 443ms ± 0% ~ (p=0.942 n=30+26) HTTPClientServer-4 548µs ± 1% 551µs ± 1% +0.60% (p=0.000 n=29+30) JSONEncode-4 210ms ± 0% 211ms ± 0% +0.03% (p=0.000 n=23+25) JSONDecode-4 866ms ± 5% 877ms ± 5% ~ (p=0.187 n=30+30) Mandelbrot200-4 51.4ms ± 0% 52.0ms ± 3% +1.15% (p=0.001 n=24+30) GoParse-4 42.9ms ± 5% 41.9ms ± 0% -2.24% (p=0.000 n=30+26) RegexpMatchEasy0_32-4 1.02µs ± 3% 1.01µs ± 0% ~ (p=0.247 n=30+26) RegexpMatchEasy0_1K-4 3.90µs ± 0% 3.90µs ± 0% ~ (p=0.062 n=24+24) RegexpMatchEasy1_32-4 955ns ± 0% 956ns ± 0% +0.16% (p=0.000 n=25+23) RegexpMatchEasy1_1K-4 6.42µs ± 3% 6.37µs ± 0% -0.81% (p=0.012 n=30+24) RegexpMatchMedium_32-4 1.77µs ± 3% 1.79µs ± 0% +1.28% (p=0.003 n=30+24) RegexpMatchMedium_1K-4 561µs ± 0% 569µs ± 3% +1.50% (p=0.000 n=25+30) RegexpMatchHard_32-4 31.0µs ± 4% 30.8µs ± 0% ~ (p=1.000 n=26+26) RegexpMatchHard_1K-4 945µs ± 3% 945µs ± 3% ~ (p=0.513 n=30+30) Revcomp-4 7.76s ± 4% 7.68s ± 0% ~ (p=0.464 n=29+23) Template-4 903ms ± 5% 904ms ± 5% ~ (p=0.248 n=30+30) TimeParse-4 4.80µs ± 0% 4.80µs ± 0% ~ (p=0.081 n=25+26) TimeFormat-4 4.70µs ± 1% 4.70µs ± 1% ~ (p=0.763 n=24+26) [Geo mean] 709µs 708µs -0.09% name old speed new speed delta GobDecode-4 8.10MB/s ± 0% 8.09MB/s ± 0% ~ (p=0.160 n=25+23) GobEncode-4 9.49MB/s ± 4% 9.53MB/s ± 4% ~ (p=0.360 n=30+30) Gzip-4 4.36MB/s ± 0% 4.32MB/s ± 0% -0.92% (p=0.000 n=25+24) Gunzip-4 43.2MB/s ± 3% 43.8MB/s ± 0% ~ (p=0.980 n=30+26) JSONEncode-4 9.22MB/s ± 0% 9.22MB/s ± 0% -0.04% (p=0.005 n=23+25) JSONDecode-4 2.24MB/s ± 5% 2.21MB/s ± 4% ~ (p=0.252 n=30+30) GoParse-4 1.35MB/s ± 5% 1.38MB/s ± 0% +2.00% (p=0.003 n=30+26) RegexpMatchEasy0_32-4 31.5MB/s ± 3% 31.8MB/s ± 0% ~ (p=0.110 n=30+26) RegexpMatchEasy0_1K-4 263MB/s ± 0% 263MB/s ± 0% ~ (p=0.111 n=24+24) RegexpMatchEasy1_32-4 33.5MB/s ± 0% 33.4MB/s ± 0% -0.16% (p=0.003 n=25+23) RegexpMatchEasy1_1K-4 160MB/s ± 3% 161MB/s ± 0% +0.78% (p=0.012 n=30+24) RegexpMatchMedium_32-4 565kB/s ± 3% 560kB/s ± 0% -0.83% (p=0.001 n=30+24) RegexpMatchMedium_1K-4 1.83MB/s ± 0% 1.80MB/s ± 3% -1.56% (p=0.000 n=25+30) RegexpMatchHard_32-4 1.03MB/s ± 3% 1.04MB/s ± 0% +1.46% (p=0.000 n=30+26) RegexpMatchHard_1K-4 1.08MB/s ± 3% 1.09MB/s ± 3% ~ (p=0.444 n=30+30) Revcomp-4 32.8MB/s ± 4% 33.1MB/s ± 0% ~ (p=0.858 n=29+23) Template-4 2.15MB/s ± 5% 2.15MB/s ± 5% ~ (p=0.646 n=30+30) [Geo mean] 7.79MB/s 7.81MB/s +0.21% 3. There is no regression in the compilecmp benchmark. name old time/op new time/op delta Template 2.35s ± 4% 2.33s ± 3% ~ (p=0.796 n=10+10) Unicode 1.35s ± 6% 1.35s ± 5% ~ (p=1.000 n=9+10) GoTypes 8.10s ± 3% 8.14s ± 3% ~ (p=0.604 n=9+10) Compiler 40.5s ± 2% 40.2s ± 2% ~ (p=0.065 n=10+9) SSA 115s ± 2% 115s ± 2% ~ (p=0.447 n=9+10) Flate 1.45s ± 3% 1.45s ± 4% ~ (p=0.739 n=10+10) GoParser 1.85s ± 3% 1.86s ± 2% ~ (p=0.853 n=10+10) Reflect 5.11s ± 2% 5.10s ± 2% ~ (p=0.971 n=10+10) Tar 2.23s ± 5% 2.23s ± 3% ~ (p=0.796 n=10+10) XML 2.67s ± 2% 2.69s ± 2% ~ (p=0.549 n=9+10) [Geo mean] 5.00s 5.00s +0.02% name old user-time/op new user-time/op delta Template 2.88s ± 2% 2.86s ± 2% ~ (p=0.529 n=10+10) Unicode 1.70s ± 7% 1.69s ± 5% ~ (p=0.853 n=10+10) GoTypes 9.72s ± 1% 9.73s ± 1% ~ (p=0.684 n=10+10) Compiler 49.0s ± 1% 48.9s ± 1% ~ (p=0.631 n=10+10) SSA 144s ± 1% 144s ± 2% ~ (p=0.684 n=10+10) Flate 1.71s ± 4% 1.72s ± 4% ~ (p=0.853 n=10+10) GoParser 2.23s ± 2% 2.23s ± 2% ~ (p=0.971 n=10+10) Reflect 5.98s ± 2% 5.96s ± 2% ~ (p=0.481 n=10+10) Tar 2.68s ± 3% 2.67s ± 2% ~ (p=0.393 n=10+10) XML 3.21s ± 3% 3.22s ± 1% ~ (p=0.604 n=10+9) [Geo mean] 6.05s 6.05s -0.04% name old text-bytes new text-bytes delta HelloSize 641kB ± 0% 641kB ± 0% ~ (all equal) name old data-bytes new data-bytes delta HelloSize 9.46kB ± 0% 9.46kB ± 0% ~ (all equal) name old bss-bytes new bss-bytes delta HelloSize 125kB ± 0% 125kB ± 0% ~ (all equal) name old exe-bytes new exe-bytes delta HelloSize 1.24MB ± 0% 1.24MB ± 0% ~ (all equal) Change-Id: I9ed9128f0114e0f1ebb08ca2d042c90fcb2b1dcd Reviewed-on: https://go-review.googlesource.com/95075 Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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