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Code Editor : phiopt.go
// Copyright 2016 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 // phiopt eliminates boolean Phis based on the previous if. // // Main use case is to transform: // x := false // if b { // x = true // } // into x = b. // // In SSA code this appears as // // b0 // If b -> b1 b2 // b1 // Plain -> b2 // b2 // x = (OpPhi (ConstBool [true]) (ConstBool [false])) // // In this case we can replace x with a copy of b. func phiopt(f *Func) { sdom := f.Sdom() for _, b := range f.Blocks { if len(b.Preds) != 2 || len(b.Values) == 0 { // TODO: handle more than 2 predecessors, e.g. a || b || c. continue } pb0, b0 := b, b.Preds[0].b for len(b0.Succs) == 1 && len(b0.Preds) == 1 { pb0, b0 = b0, b0.Preds[0].b } if b0.Kind != BlockIf { continue } pb1, b1 := b, b.Preds[1].b for len(b1.Succs) == 1 && len(b1.Preds) == 1 { pb1, b1 = b1, b1.Preds[0].b } if b1 != b0 { continue } // b0 is the if block giving the boolean value. // reverse is the predecessor from which the truth value comes. var reverse int if b0.Succs[0].b == pb0 && b0.Succs[1].b == pb1 { reverse = 0 } else if b0.Succs[0].b == pb1 && b0.Succs[1].b == pb0 { reverse = 1 } else { b.Fatalf("invalid predecessors\n") } for _, v := range b.Values { if v.Op != OpPhi { continue } // Look for conversions from bool to 0/1. if v.Type.IsInteger() { phioptint(v, b0, reverse) } if !v.Type.IsBoolean() { continue } // Replaces // if a { x = true } else { x = false } with x = a // and // if a { x = false } else { x = true } with x = !a if v.Args[0].Op == OpConstBool && v.Args[1].Op == OpConstBool { if v.Args[reverse].AuxInt != v.Args[1-reverse].AuxInt { ops := [2]Op{OpNot, OpCopy} v.reset(ops[v.Args[reverse].AuxInt]) v.AddArg(b0.Controls[0]) if f.pass.debug > 0 { f.Warnl(b.Pos, "converted OpPhi to %v", v.Op) } continue } } // Replaces // if a { x = true } else { x = value } with x = a || value. // Requires that value dominates x, meaning that regardless of a, // value is always computed. This guarantees that the side effects // of value are not seen if a is false. if v.Args[reverse].Op == OpConstBool && v.Args[reverse].AuxInt == 1 { if tmp := v.Args[1-reverse]; sdom.IsAncestorEq(tmp.Block, b) { v.reset(OpOrB) v.SetArgs2(b0.Controls[0], tmp) if f.pass.debug > 0 { f.Warnl(b.Pos, "converted OpPhi to %v", v.Op) } continue } } // Replaces // if a { x = value } else { x = false } with x = a && value. // Requires that value dominates x, meaning that regardless of a, // value is always computed. This guarantees that the side effects // of value are not seen if a is false. if v.Args[1-reverse].Op == OpConstBool && v.Args[1-reverse].AuxInt == 0 { if tmp := v.Args[reverse]; sdom.IsAncestorEq(tmp.Block, b) { v.reset(OpAndB) v.SetArgs2(b0.Controls[0], tmp) if f.pass.debug > 0 { f.Warnl(b.Pos, "converted OpPhi to %v", v.Op) } continue } } } } } func phioptint(v *Value, b0 *Block, reverse int) { a0 := v.Args[0] a1 := v.Args[1] if a0.Op != a1.Op { return } switch a0.Op { case OpConst8, OpConst16, OpConst32, OpConst64: default: return } negate := false switch { case a0.AuxInt == 0 && a1.AuxInt == 1: negate = true case a0.AuxInt == 1 && a1.AuxInt == 0: default: return } if reverse == 1 { negate = !negate } switch v.Type.Size() { case 1: v.reset(OpCopy) case 2: v.reset(OpZeroExt8to16) case 4: v.reset(OpZeroExt8to32) case 8: v.reset(OpZeroExt8to64) default: v.Fatalf("bad int size %d", v.Type.Size()) } a := b0.Controls[0] if negate { a = v.Block.NewValue1(v.Pos, OpNot, a.Type, a) } v.AddArg(a) f := b0.Func if f.pass.debug > 0 { f.Warnl(v.Block.Pos, "converted OpPhi bool -> int%d", v.Type.Size()*8) } }
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