projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| b37bf2e1 | 1 | /* |
| 81345200 | 2 | * Copyright (C) 2014 Apple Inc. All rights reserved. |
| b37bf2e1 A |
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 | * | |
| 9dae56ea | 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| b37bf2e1 A |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 9dae56ea | 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| b37bf2e1 A |
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 | |
| 6fe7ccc8 | 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| b37bf2e1 A |
24 | */ |
| 25 | ||
| 81345200 A |
26 | #ifndef FTLWeight_h |
| 27 | #define FTLWeight_h | |
| 6fe7ccc8 | 28 | |
| 81345200 A |
29 | #if ENABLE(FTL_JIT) |
| 30 | ||
| 31 | #include <wtf/MathExtras.h> | |
| 6fe7ccc8 | 32 | #include <wtf/StdLibExtras.h> |
| b37bf2e1 | 33 | |
| 81345200 | 34 | namespace JSC { namespace FTL { |
| b37bf2e1 | 35 | |
| 81345200 A |
36 | class Weight { |
| 37 | public: | |
| 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 | unsigned scaleToTotal(double total) const | |
| 54 | { | |
| 55 | // LLVM accepts 32-bit unsigned branch weights but in dumps it might display them | |
| 56 | // as signed values. We don't need all 32 bits, so we just use the 31 bits. | |
| 57 | double result = static_cast<double>(m_value) * INT_MAX / total; | |
| 58 | if (result < 0) | |
| 59 | return 0; | |
| 60 | if (result > INT_MAX) | |
| 61 | return INT_MAX; | |
| 62 | return static_cast<unsigned>(result); | |
| 63 | } | |
| 64 | ||
| 65 | private: | |
| 66 | float m_value; | |
| 6fe7ccc8 | 67 | }; |
| b37bf2e1 | 68 | |
| 81345200 A |
69 | } } // namespace JSC::FTL |
| 70 | ||
| 71 | #endif // ENABLE(FTL_JIT) | |
| 9dae56ea | 72 | |
| 81345200 | 73 | #endif // FTLWeight_h |
| 6fe7ccc8 | 74 |