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| author | fanzha02 <fannie.zhang@arm.com> | 2020-12-07 19:15:15 +0800 |
|---|---|---|
| committer | fannie zhang <Fannie.Zhang@arm.com> | 2021-03-02 06:38:07 +0000 |
| commit | 2b50ab2aee75d3c361fcd1eb39e830e2e73056b6 (patch) | |
| tree | 86c8adabbab0b962827eebb995e054fc5ac6098d /src/cmd/compile/internal/ssa/rewriteAMD64.go | |
| parent | ebb92dfed96fadb3c563ff11cead85bbb7536793 (diff) | |
| download | go-2b50ab2aee75d3c361fcd1eb39e830e2e73056b6.tar.gz go-2b50ab2aee75d3c361fcd1eb39e830e2e73056b6.zip | |
cmd/compile: optimize single-precision floating point square root
Add generic rule to rewrite the single-precision square root expression
with one single-precision instruction. The optimization will reduce two
times of precision converting between double-precision and single-precision.
On arm64 flatform.
previous:
FCVTSD F0, F0
FSQRTD F0, F0
FCVTDS F0, F0
optimized:
FSQRTS S0, S0
And this patch adds the test case to check the correctness.
This patch refers to CL 241877, contributed by Alice Xu
(dianhong.xu@arm.com)
Change-Id: I6de5d02281c693017ac4bd4c10963dd55989bd7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/276873
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/cmd/compile/internal/ssa/rewriteAMD64.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteAMD64.go | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/rewriteAMD64.go b/src/cmd/compile/internal/ssa/rewriteAMD64.go index 599137c806..52d0fd095d 100644 --- a/src/cmd/compile/internal/ssa/rewriteAMD64.go +++ b/src/cmd/compile/internal/ssa/rewriteAMD64.go @@ -1089,6 +1089,9 @@ func rewriteValueAMD64(v *Value) bool { case OpSqrt: v.Op = OpAMD64SQRTSD return true + case OpSqrt32: + v.Op = OpAMD64SQRTSS + return true case OpStaticCall: v.Op = OpAMD64CALLstatic return true |