22355d6cd2
This CL optimizes math.bits.TrailingZeros16 on 386 with a pair of BSFL and ORL instrcutions. The case TrailingZeros16-4 of the benchmark test in math/bits shows big improvement. name old time/op new time/op delta TrailingZeros16-4 1.55ns ± 1% 0.87ns ± 1% -43.87% (p=0.000 n=50+49) Change-Id: Ia899975b0e46f45dcd20223b713ed632bc32740b Reviewed-on: https://go-review.googlesource.com/c/go/+/189277 Run-TryBot: Ben Shi <powerman1st@163.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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