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Code Editor : copyelim.go
// Copyright 2015 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 // copyelim removes all uses of OpCopy values from f. // A subsequent deadcode pass is needed to actually remove the copies. func copyelim(f *Func) { // Modify all values so no arg (including args // of OpCopy) is a copy. for _, b := range f.Blocks { for _, v := range b.Values { copyelimValue(v) } } // Update block control values. for _, b := range f.Blocks { for i, v := range b.ControlValues() { if v.Op == OpCopy { b.ReplaceControl(i, v.Args[0]) } } } // Update named values. for _, name := range f.Names { values := f.NamedValues[name] for i, v := range values { if v.Op == OpCopy { values[i] = v.Args[0] } } } } // copySource returns the (non-copy) op which is the // ultimate source of v. v must be a copy op. func copySource(v *Value) *Value { w := v.Args[0] // This loop is just: // for w.Op == OpCopy { // w = w.Args[0] // } // but we take some extra care to make sure we // don't get stuck in an infinite loop. // Infinite copy loops may happen in unreachable code. // (TODO: or can they? Needs a test.) slow := w var advance bool for w.Op == OpCopy { w = w.Args[0] if w == slow { w.reset(OpUnknown) break } if advance { slow = slow.Args[0] } advance = !advance } // The answer is w. Update all the copies we saw // to point directly to w. Doing this update makes // sure that we don't end up doing O(n^2) work // for a chain of n copies. for v != w { x := v.Args[0] v.SetArg(0, w) v = x } return w } // copyelimValue ensures that no args of v are copies. func copyelimValue(v *Value) { for i, a := range v.Args { if a.Op == OpCopy { v.SetArg(i, copySource(a)) } } }
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