| commit | 8149db4f64aa72407d8be2184d0b414b535cd124 | [log] [tgz] |
|---|---|---|
| author | erifan01 <eric.fang@arm.com> | Tue May 22 06:58:32 2018 +0000 |
| committer | Cherry Zhang <cherryyz@google.com> | Thu Sep 13 14:52:51 2018 +0000 |
| tree | 0c0699f22bd284fe467d05df24c489bce827e745 | |
| parent | a2a3dd00c934fa15ad880ee5fe1f64308cbc73a7 [diff] |
cmd/compile: intrinsify math.RoundToEven and math.Abs on arm64 math.RoundToEven can be done by one arm64 instruction FRINTND, intrinsify it to improve performance. The current pure Go implementation of the function Abs is translated into five instructions on arm64: str, ldr, and, str, ldr. The intrinsic implementation requires only one instruction, so in terms of performance, intrinsify it is worthwhile. Benchmarks: name old time/op new time/op delta Abs-8 3.50ns ± 0% 1.50ns ± 0% -57.14% (p=0.000 n=10+10) RoundToEven-8 9.26ns ± 0% 1.50ns ± 0% -83.80% (p=0.000 n=10+10) Change-Id: I9456b26ab282b544dfac0154fc86f17aed96ac3d Reviewed-on: https://go-review.googlesource.com/116535 Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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