mirror of
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b8fdaaf028
The change contains 3 spot optimizations to scan loop: 1. Don't use byte vars, use uintptr's instead. This seems to alleviate some codegen issue, and alone accounts to a half of speedup. 2. Remove bitmap cache. Currently we cache only 1 byte, so caching is not particularly effective anyway. Removal of the cache simplifies code and positively affects regalloc. 3. Replace BitsMultiword switch with if and do debug checks only in Debug mode. I've benchmarked changes separately and ensured that each of them provides speedup on top of the previous one. This change as a whole fixes the unintentional regressions of scan loop that were introduced during development cycle. Fixes #8625. Fixes #8565. On go.benchmarks/garbage benchmark: GOMAXPROCS=1 time: -3.13% cputime: -3.22% gc-pause-one: -15.71% gc-pause-total: -15.71% GOMAXPROCS=32 time: -1.96% cputime: -4.43% gc-pause-one: -6.22% gc-pause-total: -6.22% LGTM=khr, rsc R=golang-codereviews, khr CC=golang-codereviews, rlh, rsc https://golang.org/cl/153990043 |
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