Source/JavaScriptCore/b3/air/AirAllocateRegistersByGraphColoring.h

/*
 * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *
 * 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
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#pragma once

#if ENABLE(B3_JIT)

#include "CPU.h"
#include "Options.h"

namespace JSC { namespace B3 { namespace Air {

class Code;

inline bool useIRC()
{
    return Options::airForceIRCAllocator()
        || (!isARM64() && !Options::airForceBriggsAllocator());
}

// We have two register allocators, both fundamentally derived from Chaitin's Yorktown
// allocator:
// http://cs.gmu.edu/~white/CS640/p98-chaitin.pdf
//
// We have an implementation of Briggs's optimistic allocator which is derivative of Chaitin's allocator:
// http://www.cs.utexas.edu/users/mckinley/380C/lecs/briggs-thesis-1992.pdf
//
// And an implementation of Andrew Appel's Iterated Register Coalescing which is derivative of Briggs's allocator.
// http://www.cs.cmu.edu/afs/cs/academic/class/15745-s07/www/papers/george.pdf
void allocateRegistersByGraphColoring(Code&);

} } } // namespace JSC::B3::Air

#endif // ENABLE(B3_JIT)