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Code Editor : zcse.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 import "cmd/compile/internal/types" // zcse does an initial pass of common-subexpression elimination on the // function for values with zero arguments to allow the more expensive cse // to begin with a reduced number of values. Values are just relinked, // nothing is deleted. A subsequent deadcode pass is required to actually // remove duplicate expressions. func zcse(f *Func) { vals := make(map[vkey]*Value) for _, b := range f.Blocks { for i := 0; i < len(b.Values); { v := b.Values[i] next := true if opcodeTable[v.Op].argLen == 0 { key := vkey{v.Op, keyFor(v), v.Aux, v.Type} if vals[key] == nil { vals[key] = v if b != f.Entry { // Move v to the entry block so it will dominate every block // where we might use it. This prevents the need for any dominator // calculations in this pass. v.Block = f.Entry f.Entry.Values = append(f.Entry.Values, v) last := len(b.Values) - 1 b.Values[i] = b.Values[last] b.Values[last] = nil b.Values = b.Values[:last] // process b.Values[i] again next = false } } } if next { i++ } } } for _, b := range f.Blocks { for _, v := range b.Values { for i, a := range v.Args { if opcodeTable[a.Op].argLen == 0 { key := vkey{a.Op, keyFor(a), a.Aux, a.Type} if rv, ok := vals[key]; ok { v.SetArg(i, rv) } } } } } } // vkey is a type used to uniquely identify a zero arg value. type vkey struct { op Op ai int64 // aux int ax interface{} // aux t *types.Type // type } // keyFor returns the AuxInt portion of a key structure uniquely identifying a // zero arg value for the supported ops. func keyFor(v *Value) int64 { switch v.Op { case OpConst64, OpConst64F, OpConst32F: return v.AuxInt case OpConst32: return int64(int32(v.AuxInt)) case OpConst16: return int64(int16(v.AuxInt)) case OpConst8, OpConstBool: return int64(int8(v.AuxInt)) default: return v.AuxInt } }
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