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| author | Ben Shi <powerman1st@163.com> | 2017-01-24 09:48:58 +0000 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2017-03-31 15:10:24 +0000 |
| commit | 8577f81a10f4e5b5736119cdd960c44a5ad600f5 (patch) | |
| tree | 05249e6f6e1fe9052d785b5973a1220221ec2c64 /src/cmd/compile/internal/ssa/rewritedec.go | |
| parent | 4a1140472b3093edf9cd653666242393d7f4c2bd (diff) | |
| download | go-8577f81a10f4e5b5736119cdd960c44a5ad600f5.tar.gz go-8577f81a10f4e5b5736119cdd960c44a5ad600f5.zip | |
cmd/compile/internal: Optimization with RBIT and REV
By checking GOARM in ssa/gen/ARM.rules, each intermediate operator
can be implemented via different instruction serials.
It is up to the user to choose between compitability and efficiency.
The Bswap32(x) is optimized to REV(x) when GOARM >= 6.
The CTZ(x) is optimized to CLZ(RBIT x) when GOARM == 7.
Change-Id: Ie9ee645fa39333fa79ad84ed4d1cefac30422814
Reviewed-on: https://go-review.googlesource.com/35610
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/compile/internal/ssa/rewritedec.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewritedec.go | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/rewritedec.go b/src/cmd/compile/internal/ssa/rewritedec.go index 2782316c7e..f82a26a417 100644 --- a/src/cmd/compile/internal/ssa/rewritedec.go +++ b/src/cmd/compile/internal/ssa/rewritedec.go @@ -4,8 +4,10 @@ package ssa import "math" +import "cmd/internal/obj" var _ = math.MinInt8 // in case not otherwise used +var _ = obj.ANOP // in case not otherwise used func rewriteValuedec(v *Value) bool { switch v.Op { case OpComplexImag: |