c03e75e539
This CL introduces yet another compiler pass, which checks for correct control flow constructs prior to converting from AST to SSA form. It cannot be integrated with walk, since walk rewrites switch and select statements on the fly. To reduce code duplication, this CL also does some minor refactoring. With this pass in place, the AST to SSA converter can now stop generating SSA for any known-dead code. This minor savings pays for the minor cost of the new pass. Performance is almost a wash: name old time/op new time/op delta Template 206ms ± 4% 205ms ± 4% ~ (p=0.108 n=43+43) Unicode 84.0ms ± 4% 84.0ms ± 4% ~ (p=0.979 n=43+43) GoTypes 550ms ± 3% 553ms ± 3% ~ (p=0.065 n=40+41) Compiler 2.57s ± 4% 2.58s ± 2% ~ (p=0.103 n=44+41) SSA 3.94s ± 3% 3.93s ± 2% ~ (p=0.833 n=44+42) Flate 126ms ± 6% 125ms ± 4% ~ (p=0.941 n=43+39) GoParser 147ms ± 4% 148ms ± 3% ~ (p=0.164 n=42+39) Reflect 359ms ± 3% 357ms ± 5% ~ (p=0.241 n=43+44) Tar 106ms ± 5% 106ms ± 7% ~ (p=0.853 n=40+43) XML 202ms ± 3% 203ms ± 3% ~ (p=0.488 n=42+41) name old user-ns/op new user-ns/op delta Template 240M ± 4% 239M ± 4% ~ (p=0.844 n=42+43) Unicode 107M ± 5% 107M ± 4% ~ (p=0.332 n=40+43) GoTypes 735M ± 3% 731M ± 4% ~ (p=0.141 n=43+44) Compiler 3.51G ± 3% 3.52G ± 3% ~ (p=0.208 n=42+43) SSA 5.72G ± 4% 5.72G ± 3% ~ (p=0.928 n=44+42) Flate 151M ± 7% 150M ± 8% ~ (p=0.662 n=44+43) GoParser 181M ± 5% 181M ± 4% ~ (p=0.379 n=41+44) Reflect 447M ± 4% 445M ± 4% ~ (p=0.344 n=43+43) Tar 125M ± 7% 124M ± 6% ~ (p=0.353 n=43+43) XML 248M ± 4% 250M ± 6% ~ (p=0.158 n=44+44) name old alloc/op new alloc/op delta Template 40.3MB ± 0% 40.2MB ± 0% -0.27% (p=0.000 n=10+10) Unicode 30.3MB ± 0% 30.2MB ± 0% -0.10% (p=0.015 n=10+10) GoTypes 114MB ± 0% 114MB ± 0% -0.06% (p=0.000 n=7+9) Compiler 480MB ± 0% 481MB ± 0% +0.07% (p=0.000 n=10+10) SSA 864MB ± 0% 862MB ± 0% -0.25% (p=0.000 n=9+10) Flate 25.9MB ± 0% 25.9MB ± 0% ~ (p=0.123 n=10+10) GoParser 32.1MB ± 0% 32.1MB ± 0% ~ (p=0.631 n=10+10) Reflect 79.9MB ± 0% 79.6MB ± 0% -0.39% (p=0.000 n=10+9) Tar 27.1MB ± 0% 27.0MB ± 0% -0.18% (p=0.003 n=10+10) XML 42.6MB ± 0% 42.6MB ± 0% ~ (p=0.143 n=10+10) name old allocs/op new allocs/op delta Template 401k ± 0% 401k ± 1% ~ (p=0.353 n=10+10) Unicode 322k ± 0% 322k ± 0% ~ (p=0.739 n=10+10) GoTypes 1.18M ± 0% 1.18M ± 0% +0.25% (p=0.001 n=7+8) Compiler 4.51M ± 0% 4.53M ± 0% +0.37% (p=0.000 n=10+10) SSA 7.91M ± 0% 7.93M ± 0% +0.20% (p=0.000 n=9+10) Flate 244k ± 0% 245k ± 0% ~ (p=0.123 n=10+10) GoParser 323k ± 1% 324k ± 1% +0.40% (p=0.035 n=10+10) Reflect 1.01M ± 0% 1.02M ± 0% +0.37% (p=0.000 n=10+9) Tar 258k ± 1% 258k ± 1% ~ (p=0.661 n=10+9) XML 403k ± 0% 405k ± 0% +0.47% (p=0.004 n=10+10) Updates #15756 Updates #19250 Change-Id: I647bfbb745c35630447eb79dfcaa994b490ce942 Reviewed-on: https://go-review.googlesource.com/38159 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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