Source/JavaScriptCore/dfg/DFGFPRInfo.h

/*
 * Copyright (C) 2011 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 DFGFPRInfo_h
#define DFGFPRInfo_h

#if ENABLE(DFG_JIT)

#include <assembler/MacroAssembler.h>
#include <dfg/DFGRegisterBank.h>

namespace JSC { namespace DFG {

typedef MacroAssembler::FPRegisterID FPRReg;
#define InvalidFPRReg ((FPRReg)-1)

class FPRInfo {
public:
    typedef FPRReg RegisterType;
    static const unsigned numberOfRegisters = 6;

    // Temporary registers.
    static const FPRReg fpRegT0 = X86Registers::xmm0;
    static const FPRReg fpRegT1 = X86Registers::xmm1;
    static const FPRReg fpRegT2 = X86Registers::xmm2;
    static const FPRReg fpRegT3 = X86Registers::xmm3;
    static const FPRReg fpRegT4 = X86Registers::xmm4;
    static const FPRReg fpRegT5 = X86Registers::xmm5;
    // These constants provide the names for the general purpose argument & return value registers.
    static const FPRReg argumentFPR0 = X86Registers::xmm0; // fpRegT0
    static const FPRReg argumentFPR1 = X86Registers::xmm1; // fpRegT1
    static const FPRReg argumentFPR2 = X86Registers::xmm2; // fpRegT2
    static const FPRReg argumentFPR3 = X86Registers::xmm3; // fpRegT3
    static const FPRReg returnValueFPR = X86Registers::xmm0; // fpRegT0

    // FPRReg mapping is direct, the machine regsiter numbers can
    // be used directly as indices into the FPR RegisterBank.
    COMPILE_ASSERT(X86Registers::xmm0 == 0, xmm0_is_0);
    COMPILE_ASSERT(X86Registers::xmm1 == 1, xmm1_is_1);
    COMPILE_ASSERT(X86Registers::xmm2 == 2, xmm2_is_2);
    COMPILE_ASSERT(X86Registers::xmm3 == 3, xmm3_is_3);
    COMPILE_ASSERT(X86Registers::xmm4 == 4, xmm4_is_4);
    COMPILE_ASSERT(X86Registers::xmm5 == 5, xmm5_is_5);
    static FPRReg toRegister(unsigned index)
    {
        return (FPRReg)index;
    }
    static unsigned toIndex(FPRReg reg)
    {
        return (unsigned)reg;
    }

#ifndef NDEBUG
    static const char* debugName(FPRReg reg)
    {
        ASSERT(reg != InvalidFPRReg);
        ASSERT(reg < 16);
        static const char* nameForRegister[16] = {
            "xmm0", "xmm1", "xmm2", "xmm3",
            "xmm4", "xmm5", "xmm6", "xmm7",
            "xmm8", "xmm9", "xmm10", "xmm11",
            "xmm12", "xmm13", "xmm14", "xmm15"
        };
        return nameForRegister[reg];
    }
#endif
};

typedef RegisterBank<FPRInfo>::iterator fpr_iterator;

} } // namespace JSC::DFG

#endif
#endif