diff options
| author | Michael Munday <mike.munday@ibm.com> | 2018-09-12 12:16:50 +0100 |
|---|---|---|
| committer | Michael Munday <mike.munday@ibm.com> | 2018-09-17 14:37:45 +0000 |
| commit | 2db1a7f929892695696eebf685fc484841c08cb4 (patch) | |
| tree | 36799ecb58734b34a8aafcbecd91f44bde676ceb /src/cmd/compile/internal/ssa/gen/386.rules | |
| parent | 859cf7fc0f4535ab3cdec15c81860f5fd2ae5b01 (diff) | |
| download | go-git-2db1a7f929892695696eebf685fc484841c08cb4.tar.gz | |
cmd/compile: avoid more float32 <-> float64 conversions in compiler
Use the new custom truncate/extension code when storing or extracting
float32 values from AuxInts to avoid the value being changed by the
host platform's floating point conversion instructions (e.g. sNaN ->
qNaN).
Updates #27516.
Change-Id: Id39650f1431ef74af088c895cf4738ea5fa87974
Reviewed-on: https://go-review.googlesource.com/134855
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/386.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/386.rules | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/386.rules b/src/cmd/compile/internal/ssa/gen/386.rules index 2a05732c98..f6aa37e884 100644 --- a/src/cmd/compile/internal/ssa/gen/386.rules +++ b/src/cmd/compile/internal/ssa/gen/386.rules @@ -44,8 +44,8 @@ (Xor(32|16|8) x y) -> (XORL x y) (Neg(32|16|8) x) -> (NEGL x) -(Neg32F x) && !config.use387 -> (PXOR x (MOVSSconst <typ.Float32> [f2i(math.Copysign(0, -1))])) -(Neg64F x) && !config.use387 -> (PXOR x (MOVSDconst <typ.Float64> [f2i(math.Copysign(0, -1))])) +(Neg32F x) && !config.use387 -> (PXOR x (MOVSSconst <typ.Float32> [auxFrom32F(float32(math.Copysign(0, -1)))])) +(Neg64F x) && !config.use387 -> (PXOR x (MOVSDconst <typ.Float64> [auxFrom64F(math.Copysign(0, -1))])) (Neg32F x) && config.use387 -> (FCHS x) (Neg64F x) && config.use387 -> (FCHS x) |