1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "AirBreakCriticalEdges.h"
28
29#if ENABLE(B3_JIT)
30
31#include "AirBlockInsertionSet.h"
32#include "AirCode.h"
33#include "AirInstInlines.h"
34
35namespace JSC { namespace B3 { namespace Air {
36
37void breakCriticalEdges(Code& code)
38{
39 BlockInsertionSet insertionSet(code);
40
41 for (BasicBlock* block : code) {
42 if (block->numSuccessors() <= 1)
43 continue;
44
45 for (BasicBlock*& successor : block->successorBlocks()) {
46 if (successor->numPredecessors() <= 1)
47 continue;
48
49 BasicBlock* pad = insertionSet.insertBefore(successor, successor->frequency());
50 pad->append(Jump, successor->at(0).origin);
51 pad->setSuccessors(successor);
52 pad->addPredecessor(block);
53 successor->replacePredecessor(block, pad);
54 successor = pad;
55 }
56 }
57
58 insertionSet.execute();
59}
60
61} } } // namespace JSC::B3::Air
62
63#endif // ENABLE(B3_JIT)
64
65