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Code Editor : looprotate.go
// Copyright 2017 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 // loopRotate converts loops with a check-loop-condition-at-beginning // to loops with a check-loop-condition-at-end. // This helps loops avoid extra unnecessary jumps. // // loop: // CMPQ ... // JGE exit // ... // JMP loop // exit: // // JMP entry // loop: // ... // entry: // CMPQ ... // JLT loop func loopRotate(f *Func) { loopnest := f.loopnest() if loopnest.hasIrreducible { return } if len(loopnest.loops) == 0 { return } idToIdx := make([]int, f.NumBlocks()) for i, b := range f.Blocks { idToIdx[b.ID] = i } // Set of blocks we're moving, by ID. move := map[ID]struct{}{} // Map from block ID to the moving blocks that should // come right after it. after := map[ID][]*Block{} // Check each loop header and decide if we want to move it. for _, loop := range loopnest.loops { b := loop.header var p *Block // b's in-loop predecessor for _, e := range b.Preds { if e.b.Kind != BlockPlain { continue } if loopnest.b2l[e.b.ID] != loop { continue } p = e.b } if p == nil || p == b { continue } after[p.ID] = []*Block{b} for { nextIdx := idToIdx[b.ID] + 1 if nextIdx >= len(f.Blocks) { // reached end of function (maybe impossible?) break } nextb := f.Blocks[nextIdx] if nextb == p { // original loop predecessor is next break } if loopnest.b2l[nextb.ID] != loop { // about to leave loop break } after[p.ID] = append(after[p.ID], nextb) b = nextb } // Place b after p. for _, b := range after[p.ID] { move[b.ID] = struct{}{} } } // Move blocks to their destinations in a single pass. // We rely here on the fact that loop headers must come // before the rest of the loop. And that relies on the // fact that we only identify reducible loops. j := 0 for i, b := range f.Blocks { if _, ok := move[b.ID]; ok { continue } f.Blocks[j] = b j++ for _, a := range after[b.ID] { if j > i { f.Fatalf("head before tail in loop %s", b) } f.Blocks[j] = a j++ } } if j != len(f.Blocks) { f.Fatalf("bad reordering in looprotate") } }
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