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The Go programming language
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While working on #30645, I noticed that many instances in which the walkinrange optimization could apply were not even being considered. This was because of extraneous blocks in the CFG, of the type that shortcircuit normally removes. The change improves the shortcircuit pass to handle most of those cases. (There are a few that can only be reasonably detected later in compilation, after other optimizations have been run, but not enough to be worth chasing.) Notable changes: * Instead of calculating live-across-blocks values, use v.Uses == 1. This is cheaper and more straightforward. v.Uses did not exist when this pass was initially written. * Incorporate a fusePlain and loop until stable. This is necessary to find many of the instances. * Allow Copy and Not wrappers around Phi values. This significantly increases effectiveness. * Allow removal of all preds, creating a dead block. The previous pass stopped unnecessarily at one pred. * Use phielimValue during cleanup instead of manually setting the op to OpCopy. The result is marginally faster compilation and smaller code. name old time/op new time/op delta Template 213ms ± 2% 212ms ± 2% -0.63% (p=0.002 n=49+48) Unicode 90.0ms ± 2% 89.8ms ± 2% ~ (p=0.122 n=48+48) GoTypes 710ms ± 3% 711ms ± 2% ~ (p=0.433 n=45+49) Compiler 3.23s ± 2% 3.22s ± 2% ~ (p=0.124 n=47+49) SSA 10.0s ± 1% 10.0s ± 1% -0.43% (p=0.000 n=48+50) Flate 135ms ± 3% 135ms ± 2% ~ (p=0.311 n=49+49) GoParser 158ms ± 2% 158ms ± 2% ~ (p=0.757 n=48+48) Reflect 447ms ± 2% 447ms ± 2% ~ (p=0.815 n=49+48) Tar 189ms ± 2% 189ms ± 3% ~ (p=0.530 n=47+49) XML 251ms ± 3% 250ms ± 1% -0.75% (p=0.002 n=49+48) [Geo mean] 427ms 426ms -0.25% name old user-time/op new user-time/op delta Template 265ms ± 2% 265ms ± 2% ~ (p=0.969 n=48+50) Unicode 119ms ± 6% 119ms ± 6% ~ (p=0.738 n=50+50) GoTypes 923ms ± 2% 925ms ± 2% ~ (p=0.057 n=43+47) Compiler 4.37s ± 2% 4.37s ± 2% ~ (p=0.691 n=50+46) SSA 13.4s ± 1% 13.4s ± 1% ~ (p=0.282 n=42+49) Flate 162ms ± 2% 162ms ± 2% ~ (p=0.774 n=48+50) GoParser 186ms ± 2% 186ms ± 3% ~ (p=0.213 n=47+47) Reflect 572ms ± 2% 573ms ± 3% ~ (p=0.303 n=50+49) Tar 240ms ± 3% 240ms ± 2% ~ (p=0.939 n=46+44) XML 302ms ± 2% 302ms ± 2% ~ (p=0.399 n=47+47) [Geo mean] 540ms 541ms +0.07% name old alloc/op new alloc/op delta Template 36.8MB ± 0% 36.7MB ± 0% -0.42% (p=0.008 n=5+5) Unicode 28.1MB ± 0% 28.1MB ± 0% ~ (p=0.151 n=5+5) GoTypes 124MB ± 0% 124MB ± 0% -0.26% (p=0.008 n=5+5) Compiler 571MB ± 0% 566MB ± 0% -0.84% (p=0.008 n=5+5) SSA 1.86GB ± 0% 1.85GB ± 0% -0.58% (p=0.008 n=5+5) Flate 22.8MB ± 0% 22.8MB ± 0% -0.17% (p=0.008 n=5+5) GoParser 27.3MB ± 0% 27.3MB ± 0% -0.20% (p=0.008 n=5+5) Reflect 79.5MB ± 0% 79.3MB ± 0% -0.20% (p=0.008 n=5+5) Tar 34.7MB ± 0% 34.6MB ± 0% -0.42% (p=0.008 n=5+5) XML 45.4MB ± 0% 45.3MB ± 0% -0.29% (p=0.008 n=5+5) [Geo mean] 80.0MB 79.7MB -0.34% name old allocs/op new allocs/op delta Template 378k ± 0% 377k ± 0% -0.22% (p=0.008 n=5+5) Unicode 339k ± 0% 339k ± 0% ~ (p=0.643 n=5+5) GoTypes 1.36M ± 0% 1.36M ± 0% -0.10% (p=0.008 n=5+5) Compiler 5.51M ± 0% 5.50M ± 0% -0.13% (p=0.008 n=5+5) SSA 17.5M ± 0% 17.5M ± 0% -0.14% (p=0.008 n=5+5) Flate 234k ± 0% 234k ± 0% -0.04% (p=0.008 n=5+5) GoParser 299k ± 0% 299k ± 0% -0.05% (p=0.008 n=5+5) Reflect 978k ± 0% 979k ± 0% +0.02% (p=0.016 n=5+5) Tar 351k ± 0% 351k ± 0% -0.04% (p=0.008 n=5+5) XML 435k ± 0% 435k ± 0% -0.11% (p=0.008 n=5+5) [Geo mean] 840k 840k -0.08% file before after Δ % go 14794788 14770212 -24576 -0.166% addr2line 4203688 4199592 -4096 -0.097% api 5954056 5941768 -12288 -0.206% asm 4862704 4846320 -16384 -0.337% cgo 4778920 4770728 -8192 -0.171% compile 24001568 23923792 -77776 -0.324% cover 5198440 5190248 -8192 -0.158% dist 3595248 3587056 -8192 -0.228% doc 4618504 4610312 -8192 -0.177% fix 3337416 3333320 -4096 -0.123% link 6120408 6116312 -4096 -0.067% nm 4149064 4140872 -8192 -0.197% objdump 4555608 4547416 -8192 -0.180% pprof 14616324 14595844 -20480 -0.140% test2json 2766328 2762232 -4096 -0.148% trace 11638844 11622460 -16384 -0.141% vet 8274936 8258552 -16384 -0.198% total 132520780 132270972 -249808 -0.189% Change-Id: Ifcd235a2a6e5f13ed5c93e62523e2ef61321fccf Reviewed-on: https://go-review.googlesource.com/c/go/+/178197 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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The Go Programming Language
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