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opt / golang / 1.19.4 / src / cmd / compile / internal / ssa /

📁 ..
📄 README.md(8.14 KB)
📄 TODO(950 B)
📄 addressingmodes.go(23.64 KB)
📄 bench_test.go(531 B)
📄 biasedsparsemap.go(2.71 KB)
📄 block.go(11.1 KB)
📄 branchelim.go(11.98 KB)
📄 branchelim_test.go(5.21 KB)
📄 cache.go(2.46 KB)
📄 check.go(16.59 KB)
📄 checkbce.go(956 B)
📄 compile.go(18.19 KB)
📄 config.go(11.7 KB)
📄 copyelim.go(1.83 KB)
📄 copyelim_test.go(1.29 KB)
📄 critical.go(3.19 KB)
📄 cse.go(9.43 KB)
📄 cse_test.go(4.25 KB)
📄 deadcode.go(9.61 KB)
📄 deadcode_test.go(3.49 KB)
📄 deadstore.go(9.08 KB)
📄 deadstore_test.go(4.09 KB)
📄 debug.go(56.34 KB)
📄 debug_lines_test.go(8.29 KB)
📄 debug_test.go(28.75 KB)
📄 decompose.go(13.41 KB)
📄 dom.go(7.98 KB)
📄 dom_test.go(13.34 KB)
📄 expand_calls.go(63.5 KB)
📄 export_test.go(3.23 KB)
📄 flagalloc.go(6.68 KB)
📄 flags_amd64_test.s(533 B)
📄 flags_arm64_test.s(699 B)
📄 flags_test.go(2.49 KB)
📄 func.go(27.08 KB)
📄 func_test.go(13.07 KB)
📄 fuse.go(6.5 KB)
📄 fuse_branchredirect.go(3.24 KB)
📄 fuse_comparisons.go(4.04 KB)
📄 fuse_test.go(7.21 KB)
📁 gen
📄 html.go(34.72 KB)
📄 id.go(576 B)
📄 layout.go(4.82 KB)
📄 lca.go(3.77 KB)
📄 lca_test.go(1.65 KB)
📄 likelyadjust.go(15.24 KB)
📄 location.go(3.06 KB)
📄 loopbce.go(10.54 KB)
📄 loopreschedchecks.go(15.86 KB)
📄 looprotate.go(2.61 KB)
📄 lower.go(1.36 KB)
📄 magic.go(15.77 KB)
📄 magic_test.go(9.1 KB)
📄 nilcheck.go(11.06 KB)
📄 nilcheck_test.go(12.17 KB)
📄 numberlines.go(7.83 KB)
📄 op.go(18.65 KB)
📄 opGen.go(1.01 MB)
📄 opt.go(308 B)
📄 passbm_test.go(3.14 KB)
📄 phielim.go(1.48 KB)
📄 phiopt.go(8.08 KB)
📄 poset.go(37.2 KB)
📄 poset_test.go(18.14 KB)
📄 print.go(3.85 KB)
📄 prove.go(41.82 KB)
📄 regalloc.go(83.69 KB)
📄 regalloc_test.go(6.49 KB)
📄 rewrite.go(53.49 KB)
📄 rewrite386.go(289.01 KB)
📄 rewrite386splitload.go(4.05 KB)
📄 rewriteAMD64.go(888.95 KB)
📄 rewriteAMD64splitload.go(21.41 KB)
📄 rewriteARM.go(487.7 KB)
📄 rewriteARM64.go(751.84 KB)
📄 rewriteCond_test.go(10.62 KB)
📄 rewriteLOONG64.go(193.44 KB)
📄 rewriteMIPS.go(174.44 KB)
📄 rewriteMIPS64.go(195.55 KB)
📄 rewritePPC64.go(431.6 KB)
📄 rewriteRISCV64.go(159.66 KB)
📄 rewriteS390X.go(433.4 KB)
📄 rewriteWasm.go(109.86 KB)
📄 rewrite_test.go(6.91 KB)
📄 rewritedec.go(10.16 KB)
📄 rewritedec64.go(63.77 KB)
📄 rewritegeneric.go(617.96 KB)
📄 schedule.go(18.23 KB)
📄 schedule_test.go(2.91 KB)
📄 shift_test.go(4.05 KB)
📄 shortcircuit.go(12.63 KB)
📄 shortcircuit_test.go(1.31 KB)
📄 sizeof_test.go(855 B)
📄 softfloat.go(1.99 KB)
📄 sparsemap.go(1.98 KB)
📄 sparseset.go(1.54 KB)
📄 sparsetree.go(8.05 KB)
📄 stackalloc.go(12.79 KB)
📄 stackframe.go(290 B)
📄 stmtlines_test.go(2.96 KB)
📁 testdata
📄 tighten.go(4.3 KB)
📄 trim.go(4.24 KB)
📄 tuple.go(1.97 KB)
📄 value.go(15.21 KB)
📄 writebarrier.go(19.29 KB)
📄 writebarrier_test.go(1.75 KB)
📄 xposmap.go(3.29 KB)
📄 zcse.go(2.07 KB)
📄 zeroextension_test.go(1.66 KB)

Editing: 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
				b.removePhiArg(phi, i)

// splitting occasionally leads to a phi having
				// a single argument (occurs with -N)
				// TODO(cuonglm,khr): replace this with phielimValue, and
				//                    make removePhiArg incorporates that.
				if len(b.Preds) == 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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Editing: critical.go

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