src/third_party/mozjs/js/src/jit/mips/Lowering-mips.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef jit_mips_Lowering_mips_h
#define jit_mips_Lowering_mips_h

#include "jit/shared/Lowering-shared.h"

namespace js {
namespace jit {

class LIRGeneratorMIPS : public LIRGeneratorShared
{
  protected:
    LIRGeneratorMIPS(MIRGenerator *gen, MIRGraph &graph, LIRGraph &lirGraph)
      : LIRGeneratorShared(gen, graph, lirGraph)
    { }

  protected:
    // Adds a box input to an instruction, setting operand |n| to the type and
    // |n+1| to the payload.
    bool useBox(LInstruction *lir, size_t n, MDefinition *mir,
                LUse::Policy policy = LUse::REGISTER, bool useAtStart = false);
    bool useBoxFixed(LInstruction *lir, size_t n, MDefinition *mir, Register reg1, Register reg2);

    // x86 has constraints on what registers can be formatted for 1-byte
    // stores and loads; on MIPS all registers are okay.
    LAllocation useByteOpRegister(MDefinition *mir);
    LAllocation useByteOpRegisterOrNonDoubleConstant(MDefinition *mir);

    inline LDefinition tempToUnbox() {
        return LDefinition::BogusTemp();
    }

    // MIPS has a scratch register, so no need for another temp for dispatch
    // ICs.
    LDefinition tempForDispatchCache(MIRType outputType = MIRType_None) {
        return LDefinition::BogusTemp();
    }

    void lowerUntypedPhiInput(MPhi *phi, uint32_t inputPosition, LBlock *block, size_t lirIndex);
    bool defineUntypedPhi(MPhi *phi, size_t lirIndex);
    bool lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
                       MDefinition *rhs);
    bool lowerUrshD(MUrsh *mir);

    bool lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir,
                     MDefinition *input);
    bool lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir,
                     MDefinition *lhs, MDefinition *rhs);

    bool lowerForFPU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir,
                     MDefinition *src);
    bool lowerForFPU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir,
                     MDefinition *lhs, MDefinition *rhs);
    bool lowerConstantDouble(double d, MInstruction *ins);
    bool lowerConstantFloat32(float d, MInstruction *ins);
    bool lowerTruncateDToInt32(MTruncateToInt32 *ins);
    bool lowerTruncateFToInt32(MTruncateToInt32 *ins);
    bool lowerDivI(MDiv *div);
    bool lowerModI(MMod *mod);
    bool lowerMulI(MMul *mul, MDefinition *lhs, MDefinition *rhs);
    bool lowerUDiv(MDiv *div);
    bool lowerUMod(MMod *mod);
    bool visitPowHalf(MPowHalf *ins);
    bool visitAsmJSNeg(MAsmJSNeg *ins);

    LTableSwitch *newLTableSwitch(const LAllocation &in, const LDefinition &inputCopy,
                                  MTableSwitch *ins);
    LTableSwitchV *newLTableSwitchV(MTableSwitch *ins);

  public:
    bool visitConstant(MConstant *ins);
    bool visitBox(MBox *box);
    bool visitUnbox(MUnbox *unbox);
    bool visitReturn(MReturn *ret);
    bool lowerPhi(MPhi *phi);
    bool visitGuardShape(MGuardShape *ins);
    bool visitGuardObjectType(MGuardObjectType *ins);
    bool visitAsmJSUnsignedToDouble(MAsmJSUnsignedToDouble *ins);
    bool visitAsmJSLoadHeap(MAsmJSLoadHeap *ins);
    bool visitAsmJSStoreHeap(MAsmJSStoreHeap *ins);
    bool visitAsmJSLoadFuncPtr(MAsmJSLoadFuncPtr *ins);
    bool visitStoreTypedArrayElementStatic(MStoreTypedArrayElementStatic *ins);
    bool visitAsmJSUDiv(MAsmJSUDiv* ins);
    bool visitAsmJSUMod(MAsmJSUDiv* ins);
    bool visitInterruptCheck(MInterruptCheck *ins);

    static bool allowFloat32Optimizations() {
        return true;
    }
};

typedef LIRGeneratorMIPS LIRGeneratorSpecific;

} // namespace jit
} // namespace js

#endif /* jit_mips_Lowering_mips_h */