1/*
2 * Copyright (C) 2015 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
30namespace JSC { namespace B3 {
31
32enum class FrequencyClass : uint8_t {
33 // We don't have any hypothesis about the frequency of this control flow construct. This is
34 // the common case. We can still use basic block frequency in this case.
35 Normal,
36
37 // We expect that this control flow construct will be reached super rarely. It's valid to
38 // perform optimizations that punish Rare code. Note that there will be situations where you
39 // have to somehow construct a new frequency class from a merging of multiple classes. When
40 // this happens, never choose Rare; always go with Normal. This is necessary because we
41 // really do punish Rare code very badly.
42 Rare
43};
44
45inline FrequencyClass maxFrequency(FrequencyClass a, FrequencyClass b)
46{
47 if (a == FrequencyClass::Normal)
48 return FrequencyClass::Normal;
49 return b;
50}
51
52} } // namespace JSC::B3
53
54namespace WTF {
55
56class PrintStream;
57
58void printInternal(PrintStream&, JSC::B3::FrequencyClass);
59
60} // namespace WTF
61
62#endif // ENABLE(B3_JIT)
63