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