1/*
2 * Copyright (C) 2016 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#pragma once
27
28#if ENABLE(B3_JIT)
29
30#include "B3ValueKey.h"
31#include <wtf/HashMap.h>
32#include <wtf/Vector.h>
33
34namespace JSC { namespace B3 {
35
36class BasicBlock;
37class Dominators;
38class Value;
39
40typedef Vector<Value*, 1> Matches;
41
42// This is a reusable utility for doing pure CSE. You can use it to do pure CSE on a program by just
43// proceeding in order and calling process().
44class PureCSE {
45public:
46 PureCSE();
47 ~PureCSE();
48
49 void clear();
50
51 Value* findMatch(const ValueKey&, BasicBlock*, Dominators&);
52
53 bool process(Value*, Dominators&);
54
55private:
56 HashMap<ValueKey, Matches> m_map;
57};
58
59bool pureCSE(Procedure&);
60
61} } // namespace JSC::B3
62
63#endif // ENABLE(B3_JIT)
64