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