cmd/compile: reduce some SSA garbage
It's pretty hard to get reliable CPU numbers, even with 50 runs on an otherwise-idle physical Linux machine, but the garbage reduction numbers are nice. To get useful time/op numbers, I modified compilebench to report user CPU time instead of wall time: name old time/op new time/op delta Template 547ms ± 6% 557ms ± 5% +1.80% (p=0.001 n=49+49) Unicode 360ms ± 9% 365ms ± 6% ~ (p=0.094 n=50+45) GoTypes 1.84s ± 3% 1.82s ± 3% -1.50% (p=0.000 n=50+49) Compiler 9.19s ± 2% 9.02s ± 2% -1.87% (p=0.000 n=45+50) name old alloc/op new alloc/op delta Template 63.3MB ± 0% 59.1MB ± 0% -6.72% (p=0.000 n=50+50) Unicode 43.1MB ± 0% 42.9MB ± 0% -0.47% (p=0.000 n=50+49) GoTypes 220MB ± 0% 200MB ± 0% -9.00% (p=0.000 n=50+50) Compiler 1.00GB ± 0% 0.89GB ± 0% -10.09% (p=0.000 n=50+49) name old allocs/op new allocs/op delta Template 681k ± 0% 680k ± 0% -0.16% (p=0.000 n=50+48) Unicode 541k ± 0% 541k ± 0% -0.02% (p=0.011 n=48+50) GoTypes 2.08M ± 0% 2.08M ± 0% -0.19% (p=0.000 n=48+50) Compiler 9.24M ± 0% 9.23M ± 0% -0.11% (p=0.000 n=50+50) Change-Id: I1fac4ebf85a1783e3289c3ffb1ed365442837643 Reviewed-on: https://go-review.googlesource.com/20995 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net> Reviewed-by: Keith Randall <khr@golang.org>
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