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cmd/internal/obj/mips: materialize float constant 0 from zero register

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Materialize float constant 0 from integer zero register, instead
of loading from constant pool.

Change-Id: Ie4728895b9d617bec2a29d15729c0efaa10eedbb
Reviewed-on: https://go-review.googlesource.com/32109
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2016-10-27 17:52:53 -04:00
parent 0acefdbea0
commit 4f1ca8b6f9
1 changed files with 12 additions and 0 deletions
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12
src/cmd/internal/obj/mips/obj0.go
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@ -58,6 +58,12 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
if p.From.Type == obj.TYPE_FCONST {
f32 := float32(p.From.Val.(float64))
i32 := math.Float32bits(f32)
if i32 == 0 {
p.As = AMOVV
p.From.Type = obj.TYPE_REG
p.From.Reg = REGZERO
break
}
literal := fmt.Sprintf("$f32.%08x", i32)
s := obj.Linklookup(ctxt, literal, 0)
s.Size = 4
@ -70,6 +76,12 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
case AMOVD:
if p.From.Type == obj.TYPE_FCONST {
i64 := math.Float64bits(p.From.Val.(float64))
if i64 == 0 {
p.As = AMOVV
p.From.Type = obj.TYPE_REG
p.From.Reg = REGZERO
break
}
literal := fmt.Sprintf("$f64.%016x", i64)
s := obj.Linklookup(ctxt, literal, 0)
s.Size = 8