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Code Editor : critical.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 // critical splits critical edges (those that go from a block with // more than one outedge to a block with more than one inedge). // Regalloc wants a critical-edge-free CFG so it can implement phi values. func critical(f *Func) { // maps from phi arg ID to the new block created for that argument blocks := make([]*Block, f.NumValues()) // need to iterate over f.Blocks without range, as we might // need to split critical edges on newly constructed blocks for j := 0; j < len(f.Blocks); j++ { b := f.Blocks[j] if len(b.Preds) <= 1 { continue } var phi *Value // determine if we've only got a single phi in this // block, this is easier to handle than the general // case of a block with multiple phi values. for _, v := range b.Values { if v.Op == OpPhi { if phi != nil { phi = nil break } phi = v } } // reset our block map if phi != nil { for _, v := range phi.Args { blocks[v.ID] = nil } } // split input edges coming from multi-output blocks. for i := 0; i < len(b.Preds); { e := b.Preds[i] p := e.b pi := e.i if p.Kind == BlockPlain { i++ continue // only single output block } var d *Block // new block used to remove critical edge reusedBlock := false // if true, then this is not the first use of this block if phi != nil { argID := phi.Args[i].ID // find or record the block that we used to split // critical edges for this argument if d = blocks[argID]; d == nil { // splitting doesn't necessarily remove the critical edge, // since we're iterating over len(f.Blocks) above, this forces // the new blocks to be re-examined. d = f.NewBlock(BlockPlain) d.Pos = p.Pos blocks[argID] = d if f.pass.debug > 0 { f.Warnl(p.Pos, "split critical edge") } } else { reusedBlock = true } } else { // no existing block, so allocate a new block // to place on the edge d = f.NewBlock(BlockPlain) d.Pos = p.Pos if f.pass.debug > 0 { f.Warnl(p.Pos, "split critical edge") } } // if this not the first argument for the // block, then we need to remove the // corresponding elements from the block // predecessors and phi args if reusedBlock { // Add p->d edge p.Succs[pi] = Edge{d, len(d.Preds)} d.Preds = append(d.Preds, Edge{p, pi}) // Remove p as a predecessor from b. b.removePred(i) // Update corresponding phi args n := len(b.Preds) phi.Args[i].Uses-- phi.Args[i] = phi.Args[n] phi.Args[n] = nil phi.Args = phi.Args[:n] // splitting occasionally leads to a phi having // a single argument (occurs with -N) if n == 1 { phi.Op = OpCopy } // Don't increment i in this case because we moved // an unprocessed predecessor down into slot i. } else { // splice it in p.Succs[pi] = Edge{d, 0} b.Preds[i] = Edge{d, 0} d.Preds = append(d.Preds, Edge{p, pi}) d.Succs = append(d.Succs, Edge{b, i}) i++ } } } }
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