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[dev.ssa] cmd/compile/internal/ssa: treat -0.0 literal as 0.0

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This matches existing behavior, see issue #2196

Change-Id: Ifa9359b7c821115389f337a57de355c5ec23be8f
Reviewed-on: https://go-review.googlesource.com/14261
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Todd Neal 2015-09-08 07:50:25 -04:00
parent 2a29576562
commit adba6c4fdf
2 changed files with 11 additions and 13 deletions
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16
src/cmd/compile/internal/gc/ssa.go
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@ -1254,9 +1254,11 @@ func (s *state) expr(n *Node) *ssa.Value {
f := n.Val().U.(*Mpflt)
switch n.Type.Size() {
case 4:
return s.constFloat32(n.Type, mpgetflt32(f))
// -0.0 literals need to be treated as if they were 0.0, adding 0.0 here
// accomplishes this while not affecting other values.
return s.constFloat32(n.Type, mpgetflt32(f)+0.0)
case 8:
return s.constFloat64(n.Type, mpgetflt(f))
return s.constFloat64(n.Type, mpgetflt(f)+0.0)
default:
s.Fatalf("bad float size %d", n.Type.Size())
return nil
@ -1269,16 +1271,18 @@ func (s *state) expr(n *Node) *ssa.Value {
case 8:
{
pt := Types[TFLOAT32]
// -0.0 literals need to be treated as if they were 0.0, adding 0.0 here
// accomplishes this while not affecting other values.
return s.newValue2(ssa.OpComplexMake, n.Type,
s.constFloat32(pt, mpgetflt32(r)),
s.constFloat32(pt, mpgetflt32(i)))
s.constFloat32(pt, mpgetflt32(r)+0.0),
s.constFloat32(pt, mpgetflt32(i)+0.0))
}
case 16:
{
pt := Types[TFLOAT64]
return s.newValue2(ssa.OpComplexMake, n.Type,
s.constFloat64(pt, mpgetflt(r)),
s.constFloat64(pt, mpgetflt(i)))
s.constFloat64(pt, mpgetflt(r)+0.0),
s.constFloat64(pt, mpgetflt(i)+0.0))
}
default:
s.Fatalf("bad float size %d", n.Type.Size())