| commit | 3cfd003a8a89c6662b4b63d837a8cfae95e6762a | [log] [tgz] |
|---|---|---|
| author | Ben Shi <powerman1st@163.com> | Fri Aug 02 02:20:38 2019 +0000 |
| committer | Brad Fitzpatrick <bradfitz@golang.org> | Wed Aug 28 15:41:58 2019 +0000 |
| tree | 6df2765928100a13e6e1f01d8335c1e865f08ac6 | |
| parent | c683ab8128e3d26a9894f315793b32fb80e4b5b3 [diff] |
cmd/compile: optimize ARM's math.bits.RotateLeft32 This CL optimizes math.bits.RotateLeft32 to inline "MOVW Rx@>Ry, Rd" on ARM. The benchmark results of math/bits show some improvements. name old time/op new time/op delta RotateLeft-4 9.42ns ± 0% 6.91ns ± 0% -26.66% (p=0.000 n=40+33) RotateLeft8-4 8.79ns ± 0% 8.79ns ± 0% -0.04% (p=0.000 n=40+31) RotateLeft16-4 8.79ns ± 0% 8.79ns ± 0% -0.04% (p=0.000 n=40+32) RotateLeft32-4 8.16ns ± 0% 7.54ns ± 0% -7.68% (p=0.000 n=40+40) RotateLeft64-4 15.7ns ± 0% 15.7ns ± 0% ~ (all equal) updates #31265 Change-Id: I77bc1c2c702d5323fc7cad5264a8e2d5666bf712 Reviewed-on: https://go-review.googlesource.com/c/go/+/188697 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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