| | 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 | #ifndef FTLWeight_h |
| | 27 | #define FTLWeight_h |
| | 28 | |
| | 29 | #if ENABLE(FTL_JIT) |
| | 30 | |
| | 31 | #include <wtf/MathExtras.h> |
| | 32 | #include <wtf/StdLibExtras.h> |
| | 33 | |
| | 34 | namespace JSC { namespace FTL { |
| | 35 | |
| | 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; |
| | 67 | }; |
| | 68 | |
| | 69 | } } // namespace JSC::FTL |
| | 70 | |
| | 71 | #endif // ENABLE(FTL_JIT) |
| | 72 | |
| | 73 | #endif // FTLWeight_h |
| | 74 | |
projects / apple / javascriptcore.git / blame_incremental