1/*
2 * Copyright (C) 2014 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(FTL_JIT)
29
30#include "B3FrequencyClass.h"
31#include <wtf/MathExtras.h>
32#include <wtf/StdLibExtras.h>
33
34namespace JSC { namespace FTL {
35
36class Weight {
37public:
38 Weight()
39 : m_value(std::numeric_limits<float>::quiet_NaN())
40 {
41 }
42
43 explicit Weight(float value)
44 : m_value(value)
45 {
46 }
47
48 bool isSet() const { return m_value == m_value; }
49 bool operator!() const { return !isSet(); }
50
51 float value() const { return m_value; }
52
53 B3::FrequencyClass frequencyClass() const { return value() ? B3::FrequencyClass::Normal : B3::FrequencyClass::Rare; }
54
55 // Inverse weight for a two-target branch.
56 Weight inverse() const
57 {
58 if (!isSet())
59 return Weight();
60 if (value())
61 return Weight(0);
62 return Weight(1);
63 }
64
65private:
66 float m_value;
67};
68
69} } // namespace JSC::FTL
70
71#endif // ENABLE(FTL_JIT)
72