1 files changed, 79 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/softfloat.go b/src/cmd/compile/internal/ssa/softfloat.go
new file mode 100644
index 0000000..a8a8f83
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/softfloat.go
@@ -0,0 +1,79 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ssa
+
+import (
+	"cmd/compile/internal/types"
+	"math"
+)
+
+func softfloat(f *Func) {
+	if !f.Config.SoftFloat {
+		return
+	}
+	newInt64 := false
+
+	for _, b := range f.Blocks {
+		for _, v := range b.Values {
+			if v.Type.IsFloat() {
+				f.unCache(v)
+				switch v.Op {
+				case OpPhi, OpLoad, OpArg:
+					if v.Type.Size() == 4 {
+						v.Type = f.Config.Types.UInt32
+					} else {
+						v.Type = f.Config.Types.UInt64
+					}
+				case OpConst32F:
+					v.Op = OpConst32
+					v.Type = f.Config.Types.UInt32
+					v.AuxInt = int64(int32(math.Float32bits(auxTo32F(v.AuxInt))))
+				case OpConst64F:
+					v.Op = OpConst64
+					v.Type = f.Config.Types.UInt64
+				case OpNeg32F:
+					arg0 := v.Args[0]
+					v.reset(OpXor32)
+					v.Type = f.Config.Types.UInt32
+					v.AddArg(arg0)
+					mask := v.Block.NewValue0(v.Pos, OpConst32, v.Type)
+					mask.AuxInt = -0x80000000
+					v.AddArg(mask)
+				case OpNeg64F:
+					arg0 := v.Args[0]
+					v.reset(OpXor64)
+					v.Type = f.Config.Types.UInt64
+					v.AddArg(arg0)
+					mask := v.Block.NewValue0(v.Pos, OpConst64, v.Type)
+					mask.AuxInt = -0x8000000000000000
+					v.AddArg(mask)
+				case OpRound32F:
+					v.Op = OpCopy
+					v.Type = f.Config.Types.UInt32
+				case OpRound64F:
+					v.Op = OpCopy
+					v.Type = f.Config.Types.UInt64
+				}
+				newInt64 = newInt64 || v.Type.Size() == 8
+			} else if (v.Op == OpStore || v.Op == OpZero || v.Op == OpMove) && v.Aux.(*types.Type).IsFloat() {
+				switch size := v.Aux.(*types.Type).Size(); size {
+				case 4:
+					v.Aux = f.Config.Types.UInt32
+				case 8:
+					v.Aux = f.Config.Types.UInt64
+				default:
+					v.Fatalf("bad float type with size %d", size)
+				}
+			}
+		}
+	}
+
+	if newInt64 && f.Config.RegSize == 4 {
+		// On 32bit arch, decompose Uint64 introduced in the switch above.
+		decomposeBuiltIn(f)
+		applyRewrite(f, rewriteBlockdec64, rewriteValuedec64, removeDeadValues)
+	}
+
+}