42d4df9459
Complete a long-standing TODO in the code. Exit blocks are cold code, so we lay them out at the end of the function. Blocks that are post-dominated by exit blocks are also ipso facto exit blocks. Treat them as such. Implement using a simple loop, because there are generally very few exit blocks. In addition to improved instruction cache, this empirically yields better register allocation. Binary size impact: file before after Δ % cgo 4812872 4808776 -4096 -0.085% fix 3370072 3365976 -4096 -0.122% vet 8252280 8248184 -4096 -0.050% total 115052984 115040696 -12288 -0.011% This also appears to improve compiler performance (-0.15% geomean time/op, -1.20% geomean user time/op), but that could just be alignment effects. Compiler benchmarking hasn't been super reliably recently, and there's no particular reason to think this should speed up the compiler that much. Change-Id: I3d262c4f5cb80626a67a5c17285e2fa09f423c00 Reviewed-on: https://go-review.googlesource.com/c/go/+/227217 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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