path: root/js/src/jit/x86-shared/LIR-x86-shared.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * 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_x86_shared_LIR_x86_shared_h
#define jit_x86_shared_LIR_x86_shared_h

namespace js {
namespace jit {

class LDivI : public LBinaryMath<1> {
 public:
  LIR_HEADER(DivI)

  LDivI(const LAllocation& lhs, const LAllocation& rhs, const LDefinition& temp)
      : LBinaryMath(classOpcode) {
    setOperand(0, lhs);
    setOperand(1, rhs);
    setTemp(0, temp);
  }

  const char* extraName() const {
    if (mir()->isTruncated()) {
      if (mir()->canBeNegativeZero()) {
        return mir()->canBeNegativeOverflow()
                   ? "Truncate_NegativeZero_NegativeOverflow"
                   : "Truncate_NegativeZero";
      }
      return mir()->canBeNegativeOverflow() ? "Truncate_NegativeOverflow"
                                            : "Truncate";
    }
    if (mir()->canBeNegativeZero()) {
      return mir()->canBeNegativeOverflow() ? "NegativeZero_NegativeOverflow"
                                            : "NegativeZero";
    }
    return mir()->canBeNegativeOverflow() ? "NegativeOverflow" : nullptr;
  }

  const LDefinition* remainder() { return getTemp(0); }
  MDiv* mir() const { return mir_->toDiv(); }
};

// Signed division by a power-of-two constant.
class LDivPowTwoI : public LBinaryMath<0> {
  const int32_t shift_;
  const bool negativeDivisor_;

 public:
  LIR_HEADER(DivPowTwoI)

  LDivPowTwoI(const LAllocation& lhs, const LAllocation& lhsCopy, int32_t shift,
              bool negativeDivisor)
      : LBinaryMath(classOpcode),
        shift_(shift),
        negativeDivisor_(negativeDivisor) {
    setOperand(0, lhs);
    setOperand(1, lhsCopy);
  }

  const LAllocation* numerator() { return getOperand(0); }
  const LAllocation* numeratorCopy() { return getOperand(1); }
  int32_t shift() const { return shift_; }
  bool negativeDivisor() const { return negativeDivisor_; }
  MDiv* mir() const { return mir_->toDiv(); }
};

class LDivOrModConstantI : public LInstructionHelper<1, 1, 1> {
  const int32_t denominator_;

 public:
  LIR_HEADER(DivOrModConstantI)

  LDivOrModConstantI(const LAllocation& lhs, int32_t denominator,
                     const LDefinition& temp)
      : LInstructionHelper(classOpcode), denominator_(denominator) {
    setOperand(0, lhs);
    setTemp(0, temp);
  }

  const LAllocation* numerator() { return getOperand(0); }
  int32_t denominator() const { return denominator_; }
  MBinaryArithInstruction* mir() const {
    MOZ_ASSERT(mir_->isDiv() || mir_->isMod());
    return static_cast<MBinaryArithInstruction*>(mir_);
  }
  bool canBeNegativeDividend() const {
    if (mir_->isMod()) {
      return mir_->toMod()->canBeNegativeDividend();
    }
    return mir_->toDiv()->canBeNegativeDividend();
  }
};

class LModI : public LBinaryMath<1> {
 public:
  LIR_HEADER(ModI)

  LModI(const LAllocation& lhs, const LAllocation& rhs, const LDefinition& temp)
      : LBinaryMath(classOpcode) {
    setOperand(0, lhs);
    setOperand(1, rhs);
    setTemp(0, temp);
  }

  const char* extraName() const {
    return mir()->isTruncated() ? "Truncated" : nullptr;
  }

  const LDefinition* remainder() { return getDef(0); }
  MMod* mir() const { return mir_->toMod(); }
};

// This class performs a simple x86 'div', yielding either a quotient or
// remainder depending on whether this instruction is defined to output eax
// (quotient) or edx (remainder).
class LUDivOrMod : public LBinaryMath<1> {
 public:
  LIR_HEADER(UDivOrMod);

  LUDivOrMod(const LAllocation& lhs, const LAllocation& rhs,
             const LDefinition& temp)
      : LBinaryMath(classOpcode) {
    setOperand(0, lhs);
    setOperand(1, rhs);
    setTemp(0, temp);
  }

  const LDefinition* remainder() { return getTemp(0); }

  const char* extraName() const {
    return mir()->isTruncated() ? "Truncated" : nullptr;
  }

  MBinaryArithInstruction* mir() const {
    MOZ_ASSERT(mir_->isDiv() || mir_->isMod());
    return static_cast<MBinaryArithInstruction*>(mir_);
  }

  bool canBeDivideByZero() const {
    if (mir_->isMod()) {
      return mir_->toMod()->canBeDivideByZero();
    }
    return mir_->toDiv()->canBeDivideByZero();
  }

  bool trapOnError() const {
    if (mir_->isMod()) {
      return mir_->toMod()->trapOnError();
    }
    return mir_->toDiv()->trapOnError();
  }

  wasm::BytecodeOffset bytecodeOffset() const {
    if (mir_->isMod()) {
      return mir_->toMod()->bytecodeOffset();
    }
    return mir_->toDiv()->bytecodeOffset();
  }
};

class LUDivOrModConstant : public LInstructionHelper<1, 1, 1> {
  const uint32_t denominator_;

 public:
  LIR_HEADER(UDivOrModConstant)

  LUDivOrModConstant(const LAllocation& lhs, uint32_t denominator,
                     const LDefinition& temp)
      : LInstructionHelper(classOpcode), denominator_(denominator) {
    setOperand(0, lhs);
    setTemp(0, temp);
  }

  const LAllocation* numerator() { return getOperand(0); }
  uint32_t denominator() const { return denominator_; }
  MBinaryArithInstruction* mir() const {
    MOZ_ASSERT(mir_->isDiv() || mir_->isMod());
    return static_cast<MBinaryArithInstruction*>(mir_);
  }
  bool canBeNegativeDividend() const {
    if (mir_->isMod()) {
      return mir_->toMod()->canBeNegativeDividend();
    }
    return mir_->toDiv()->canBeNegativeDividend();
  }
  bool trapOnError() const {
    if (mir_->isMod()) {
      return mir_->toMod()->trapOnError();
    }
    return mir_->toDiv()->trapOnError();
  }
  wasm::BytecodeOffset bytecodeOffset() const {
    if (mir_->isMod()) {
      return mir_->toMod()->bytecodeOffset();
    }
    return mir_->toDiv()->bytecodeOffset();
  }
};

class LModPowTwoI : public LInstructionHelper<1, 1, 0> {
  const int32_t shift_;

 public:
  LIR_HEADER(ModPowTwoI)

  LModPowTwoI(const LAllocation& lhs, int32_t shift)
      : LInstructionHelper(classOpcode), shift_(shift) {
    setOperand(0, lhs);
  }

  int32_t shift() const { return shift_; }
  const LDefinition* remainder() { return getDef(0); }
  MMod* mir() const { return mir_->toMod(); }
};

// Takes a tableswitch with an integer to decide
class LTableSwitch : public LInstructionHelper<0, 1, 2> {
 public:
  LIR_HEADER(TableSwitch)

  LTableSwitch(const LAllocation& in, const LDefinition& inputCopy,
               const LDefinition& jumpTablePointer, MTableSwitch* ins)
      : LInstructionHelper(classOpcode) {
    setOperand(0, in);
    setTemp(0, inputCopy);
    setTemp(1, jumpTablePointer);
    setMir(ins);
  }

  MTableSwitch* mir() const { return mir_->toTableSwitch(); }

  const LAllocation* index() { return getOperand(0); }
  const LDefinition* tempInt() { return getTemp(0); }
  const LDefinition* tempPointer() { return getTemp(1); }
};

// Takes a tableswitch with a value to decide
class LTableSwitchV : public LInstructionHelper<0, BOX_PIECES, 3> {
 public:
  LIR_HEADER(TableSwitchV)

  LTableSwitchV(const LBoxAllocation& input, const LDefinition& inputCopy,
                const LDefinition& floatCopy,
                const LDefinition& jumpTablePointer, MTableSwitch* ins)
      : LInstructionHelper(classOpcode) {
    setBoxOperand(InputValue, input);
    setTemp(0, inputCopy);
    setTemp(1, floatCopy);
    setTemp(2, jumpTablePointer);
    setMir(ins);
  }

  MTableSwitch* mir() const { return mir_->toTableSwitch(); }

  static const size_t InputValue = 0;

  const LDefinition* tempInt() { return getTemp(0); }
  const LDefinition* tempFloat() { return getTemp(1); }
  const LDefinition* tempPointer() { return getTemp(2); }
};

class LMulI : public LBinaryMath<0, 1> {
 public:
  LIR_HEADER(MulI)

  LMulI(const LAllocation& lhs, const LAllocation& rhs,
        const LAllocation& lhsCopy)
      : LBinaryMath(classOpcode) {
    setOperand(0, lhs);
    setOperand(1, rhs);
    setOperand(2, lhsCopy);
  }

  const char* extraName() const {
    return (mir()->mode() == MMul::Integer)
               ? "Integer"
               : (mir()->canBeNegativeZero() ? "CanBeNegativeZero" : nullptr);
  }

  MMul* mir() const { return mir_->toMul(); }
  const LAllocation* lhsCopy() { return this->getOperand(2); }
};

class LInt64ToFloatingPoint : public LInstructionHelper<1, INT64_PIECES, 1> {
 public:
  LIR_HEADER(Int64ToFloatingPoint);

  LInt64ToFloatingPoint(const LInt64Allocation& in, const LDefinition& temp)
      : LInstructionHelper(classOpcode) {
    setInt64Operand(0, in);
    setTemp(0, temp);
  }

  MInt64ToFloatingPoint* mir() const { return mir_->toInt64ToFloatingPoint(); }

  const LDefinition* temp() { return getTemp(0); }
};

}  // namespace jit
}  // namespace js

#endif /* jit_x86_shared_LIR_x86_shared_h */