/*
 * Copyright (C) 2015 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. 
 */

#ifndef B3FrequencyClass_h
#define B3FrequencyClass_h

#if ENABLE(B3_JIT)

namespace JSC { namespace B3 {

enum class FrequencyClass : uint8_t {
    // We don't have any hypothesis about the frequency of this control flow construct. This is
    // the common case. We can still use basic block frequency in this case.
    Normal,

    // We expect that this control flow construct will be reached super rarely. It's valid to
    // perform optimizations that punish Rare code. Note that there will be situations where you
    // have to somehow construct a new frequency class from a merging of multiple classes. When
    // this happens, never choose Rare; always go with Normal. This is necessary because we
    // really do punish Rare code very badly.
    Rare
};

inline FrequencyClass maxFrequency(FrequencyClass a, FrequencyClass b)
{
    if (a == FrequencyClass::Normal)
        return FrequencyClass::Normal;
    return b;
}

} } // namespace JSC::B3

namespace WTF {

class PrintStream;

void printInternal(PrintStream&, JSC::B3::FrequencyClass);

} // namespace WTF

#endif // ENABLE(B3_JIT)

#endif // B3FrequencyClass_h

