mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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* Copyright (C) 2014 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(FTL_JIT)
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#include "B3FrequencyClass.h"
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#include <wtf/MathExtras.h>
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#include <wtf/StdLibExtras.h>
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namespace JSC { namespace FTL {
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class Weight {
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public:
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Weight()
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: m_value(std::numeric_limits<float>::quiet_NaN())
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{
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}
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explicit Weight(float value)
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: m_value(value)
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{
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}
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bool isSet() const { return m_value == m_value; }
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bool operator!() const { return !isSet(); }
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float value() const { return m_value; }
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B3::FrequencyClass frequencyClass() const { return value() ? B3::FrequencyClass::Normal : B3::FrequencyClass::Rare; }
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// Inverse weight for a two-target branch.
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Weight inverse() const
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{
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if (!isSet())
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return Weight();
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if (value())
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return Weight(0);
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return Weight(1);
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}
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private:
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float m_value;
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};
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} } // namespace JSC::FTL
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#endif // ENABLE(FTL_JIT)
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