commit | 204cc14bddf6bdd553fd6139e395b1e203ce1d48 | [log] [tgz] |
---|---|---|
author | erifan01 <eric.fang@arm.com> | Sat Jun 30 06:48:51 2018 +0000 |
committer | Cherry Zhang <cherryyz@google.com> | Fri Sep 07 14:52:02 2018 +0000 |
tree | ae06b9f1a251a979c4ca70c7f119e567aa77974b | |
parent | d8c8a1421837e86d5b5a20f2925b783c594ef9d6 [diff] |
cmd/compile: implement non-constant rotates using ROR on arm64 Add some rules to match the Go code like: y &= 63 x << y | x >> (64-y) or y &= 63 x >> y | x << (64-y) as a ROR instruction. Make math/bits.RotateLeft faster on arm64. Extends CL 132435 to arm64. Benchmarks of math/bits.RotateLeftxxN: name old time/op new time/op delta RotateLeft-8 3.548750ns +- 1% 2.003750ns +- 0% -43.54% (p=0.000 n=8+8) RotateLeft8-8 3.925000ns +- 0% 3.925000ns +- 0% ~ (p=1.000 n=8+8) RotateLeft16-8 3.925000ns +- 0% 3.927500ns +- 0% ~ (p=0.608 n=8+8) RotateLeft32-8 3.925000ns +- 0% 2.002500ns +- 0% -48.98% (p=0.000 n=8+8) RotateLeft64-8 3.536250ns +- 0% 2.003750ns +- 0% -43.34% (p=0.000 n=8+8) Change-Id: I77622cd7f39b917427e060647321f5513973232c Reviewed-on: https://go-review.googlesource.com/122542 Run-TryBot: Ben Shi <powerman1st@163.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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