jit/mips64/Lowering-mips64.cpp

/* -*- 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/. */

#include "jit/mips64/Lowering-mips64.h"

#include "jit/Lowering.h"
#include "jit/mips64/Assembler-mips64.h"
#include "jit/MIR.h"

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

using namespace js;
using namespace js::jit;

void LIRGeneratorMIPS64::defineInt64Phi(MPhi* phi, size_t lirIndex) {
  defineTypedPhi(phi, lirIndex);
}

void LIRGeneratorMIPS64::lowerInt64PhiInput(MPhi* phi, uint32_t inputPosition,
                                            LBlock* block, size_t lirIndex) {
  lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
}

LBoxAllocation LIRGeneratorMIPS64::useBoxFixed(MDefinition* mir, Register reg1,
                                               Register reg2, bool useAtStart) {
  MOZ_ASSERT(mir->type() == MIRType::Value);

  ensureDefined(mir);
  return LBoxAllocation(LUse(reg1, mir->virtualRegister(), useAtStart));
}

void LIRGeneratorMIPS64::lowerDivI64(MDiv* div) {
  if (div->isUnsigned()) {
    lowerUDivI64(div);
    return;
  }

  LDivOrModI64* lir = new (alloc())
      LDivOrModI64(useRegister(div->lhs()), useRegister(div->rhs()), temp());
  defineInt64(lir, div);
}

void LIRGeneratorMIPS64::lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div) {
  MOZ_CRASH("We don't use runtime div for this architecture");
}

void LIRGeneratorMIPS64::lowerModI64(MMod* mod) {
  if (mod->isUnsigned()) {
    lowerUModI64(mod);
    return;
  }

  LDivOrModI64* lir = new (alloc())
      LDivOrModI64(useRegister(mod->lhs()), useRegister(mod->rhs()), temp());
  defineInt64(lir, mod);
}

void LIRGeneratorMIPS64::lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod) {
  MOZ_CRASH("We don't use runtime mod for this architecture");
}

void LIRGeneratorMIPS64::lowerUDivI64(MDiv* div) {
  LUDivOrModI64* lir = new (alloc())
      LUDivOrModI64(useRegister(div->lhs()), useRegister(div->rhs()), temp());
  defineInt64(lir, div);
}

void LIRGeneratorMIPS64::lowerUModI64(MMod* mod) {
  LUDivOrModI64* lir = new (alloc())
      LUDivOrModI64(useRegister(mod->lhs()), useRegister(mod->rhs()), temp());
  defineInt64(lir, mod);
}

void LIRGeneratorMIPS64::lowerBigIntDiv(MBigIntDiv* ins) {
  auto* lir = new (alloc()) LBigIntDiv(useRegister(ins->lhs()),
                                       useRegister(ins->rhs()), temp(), temp());
  define(lir, ins);
  assignSafepoint(lir, ins);
}

void LIRGeneratorMIPS64::lowerBigIntMod(MBigIntMod* ins) {
  auto* lir = new (alloc()) LBigIntMod(useRegister(ins->lhs()),
                                       useRegister(ins->rhs()), temp(), temp());
  define(lir, ins);
  assignSafepoint(lir, ins);
}

void LIRGeneratorMIPS64::lowerAtomicLoad64(MLoadUnboxedScalar* ins) {
  const LUse elements = useRegister(ins->elements());
  const LAllocation index =
      useRegisterOrIndexConstant(ins->index(), ins->storageType());

  auto* lir = new (alloc()) LAtomicLoad64(elements, index, temp(), tempInt64());
  define(lir, ins);
  assignSafepoint(lir, ins);
}

void LIRGeneratorMIPS64::lowerAtomicStore64(MStoreUnboxedScalar* ins) {
  LUse elements = useRegister(ins->elements());
  LAllocation index =
      useRegisterOrIndexConstant(ins->index(), ins->writeType());
  LAllocation value = useRegister(ins->value());

  add(new (alloc()) LAtomicStore64(elements, index, value, tempInt64()), ins);
}

void LIRGenerator::visitBox(MBox* box) {
  MDefinition* opd = box->getOperand(0);

  // If the operand is a constant, emit near its uses.
  if (opd->isConstant() && box->canEmitAtUses()) {
    emitAtUses(box);
    return;
  }

  if (opd->isConstant()) {
    define(new (alloc()) LValue(opd->toConstant()->toJSValue()), box,
           LDefinition(LDefinition::BOX));
  } else {
    LBox* ins = new (alloc()) LBox(useRegister(opd), opd->type());
    define(ins, box, LDefinition(LDefinition::BOX));
  }
}

void LIRGenerator::visitUnbox(MUnbox* unbox) {
  MDefinition* box = unbox->getOperand(0);
  MOZ_ASSERT(box->type() == MIRType::Value);

  LUnbox* lir;
  if (IsFloatingPointType(unbox->type())) {
    lir = new (alloc())
        LUnboxFloatingPoint(useRegisterAtStart(box), unbox->type());
  } else if (unbox->fallible()) {
    // If the unbox is fallible, load the Value in a register first to
    // avoid multiple loads.
    lir = new (alloc()) LUnbox(useRegisterAtStart(box));
  } else {
    lir = new (alloc()) LUnbox(useAtStart(box));
  }

  if (unbox->fallible()) {
    assignSnapshot(lir, unbox->bailoutKind());
  }

  define(lir, unbox);
}

void LIRGenerator::visitReturnImpl(MDefinition* opd, bool isGenerator) {
  MOZ_ASSERT(opd->type() == MIRType::Value);

  LReturn* ins = new (alloc()) LReturn(isGenerator);
  ins->setOperand(0, useFixed(opd, JSReturnReg));
  add(ins);
}

void LIRGeneratorMIPS64::lowerUntypedPhiInput(MPhi* phi, uint32_t inputPosition,
                                              LBlock* block, size_t lirIndex) {
  lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
}

void LIRGeneratorMIPS64::lowerTruncateDToInt32(MTruncateToInt32* ins) {
  MDefinition* opd = ins->input();
  MOZ_ASSERT(opd->type() == MIRType::Double);

  define(new (alloc()) LTruncateDToInt32(useRegister(opd), tempDouble()), ins);
}

void LIRGeneratorMIPS64::lowerTruncateFToInt32(MTruncateToInt32* ins) {
  MDefinition* opd = ins->input();
  MOZ_ASSERT(opd->type() == MIRType::Float32);

  define(new (alloc()) LTruncateFToInt32(useRegister(opd), tempFloat32()), ins);
}

void LIRGenerator::visitWasmTruncateToInt64(MWasmTruncateToInt64* ins) {
  MDefinition* opd = ins->input();
  MOZ_ASSERT(opd->type() == MIRType::Double || opd->type() == MIRType::Float32);

  defineInt64(new (alloc()) LWasmTruncateToInt64(useRegister(opd)), ins);
}

void LIRGeneratorMIPS64::lowerWasmBuiltinTruncateToInt64(
    MWasmBuiltinTruncateToInt64* ins) {
  MOZ_CRASH("We don't use it for this architecture");
}

void LIRGenerator::visitInt64ToFloatingPoint(MInt64ToFloatingPoint* ins) {
  MDefinition* opd = ins->input();
  MOZ_ASSERT(opd->type() == MIRType::Int64);
  MOZ_ASSERT(IsFloatingPointType(ins->type()));

  define(new (alloc()) LInt64ToFloatingPoint(useInt64Register(opd)), ins);
}

void LIRGeneratorMIPS64::lowerBuiltinInt64ToFloatingPoint(
    MBuiltinInt64ToFloatingPoint* ins) {
  MOZ_CRASH("We don't use it for this architecture");
}