From 4f1ca8b6f92d69a889a6884d3b8393fdcf530e2b Mon Sep 17 00:00:00 2001 From: Cherry Zhang Date: Thu, 27 Oct 2016 17:52:53 -0400 Subject: [PATCH] cmd/internal/obj/mips: materialize float constant 0 from zero register 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 TryBot-Result: Gobot Gobot Reviewed-by: David Chase --- src/cmd/internal/obj/mips/obj0.go | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/src/cmd/internal/obj/mips/obj0.go b/src/cmd/internal/obj/mips/obj0.go index 402b65eb27..651da23955 100644 --- a/src/cmd/internal/obj/mips/obj0.go +++ b/src/cmd/internal/obj/mips/obj0.go @@ -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 -- 2.48.1