Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1101 insertions, 0 deletions

diff --git a/js/src/jit/riscv64/Lowering-riscv64.cpp b/js/src/jit/riscv64/Lowering-riscv64.cpp
new file mode 100644
index 0000000000..d8c1a49e3d
--- /dev/null
+++ b/js/src/jit/riscv64/Lowering-riscv64.cpp
@@ -0,0 +1,1101 @@
+/* -*- 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/riscv64/Lowering-riscv64.h"
+
+#include "mozilla/MathAlgorithms.h"
+
+#include "jit/Lowering.h"
+#include "jit/MIR.h"
+#include "jit/riscv64/Assembler-riscv64.h"
+
+#include "jit/shared/Lowering-shared-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+using mozilla::FloorLog2;
+
+LTableSwitch* LIRGeneratorRiscv64::newLTableSwitch(const LAllocation& in,
+                                                   const LDefinition& inputCopy,
+                                                   MTableSwitch* tableswitch) {
+  return new (alloc()) LTableSwitch(in, inputCopy, temp(), tableswitch);
+}
+
+LTableSwitchV* LIRGeneratorRiscv64::newLTableSwitchV(
+    MTableSwitch* tableswitch) {
+  return new (alloc()) LTableSwitchV(useBox(tableswitch->getOperand(0)), temp(),
+                                     tempDouble(), temp(), tableswitch);
+}
+
+void LIRGeneratorRiscv64::lowerForShift(LInstructionHelper<1, 2, 0>* ins,
+                                        MDefinition* mir, MDefinition* lhs,
+                                        MDefinition* rhs) {
+  ins->setOperand(0, useRegister(lhs));
+  ins->setOperand(1, useRegisterOrConstant(rhs));
+  define(ins, mir);
+}
+
+template <size_t Temps>
+void LIRGeneratorRiscv64::lowerForShiftInt64(
+    LInstructionHelper<INT64_PIECES, INT64_PIECES + 1, Temps>* ins,
+    MDefinition* mir, MDefinition* lhs, MDefinition* rhs) {
+  ins->setInt64Operand(0, useInt64RegisterAtStart(lhs));
+
+  static_assert(LShiftI64::Rhs == INT64_PIECES,
+                "Assume Rhs is located at INT64_PIECES.");
+  static_assert(LRotateI64::Count == INT64_PIECES,
+                "Assume Count is located at INT64_PIECES.");
+
+  ins->setOperand(INT64_PIECES, useRegisterOrConstant(rhs));
+
+  defineInt64ReuseInput(ins, mir, 0);
+}
+
+template void LIRGeneratorRiscv64::lowerForShiftInt64(
+    LInstructionHelper<INT64_PIECES, INT64_PIECES + 1, 0>* ins,
+    MDefinition* mir, MDefinition* lhs, MDefinition* rhs);
+template void LIRGeneratorRiscv64::lowerForShiftInt64(
+    LInstructionHelper<INT64_PIECES, INT64_PIECES + 1, 1>* ins,
+    MDefinition* mir, MDefinition* lhs, MDefinition* rhs);
+
+// x = !y
+void LIRGeneratorRiscv64::lowerForALU(LInstructionHelper<1, 1, 0>* ins,
+                                      MDefinition* mir, MDefinition* input) {
+  ins->setOperand(0, useRegister(input));
+  define(
+      ins, mir,
+      LDefinition(LDefinition::TypeFrom(mir->type()), LDefinition::REGISTER));
+}
+
+// z = x + y
+void LIRGeneratorRiscv64::lowerForALU(LInstructionHelper<1, 2, 0>* ins,
+                                      MDefinition* mir, MDefinition* lhs,
+                                      MDefinition* rhs) {
+  ins->setOperand(0, useRegister(lhs));
+  ins->setOperand(1, useRegisterOrConstant(rhs));
+  define(
+      ins, mir,
+      LDefinition(LDefinition::TypeFrom(mir->type()), LDefinition::REGISTER));
+}
+
+void LIRGeneratorRiscv64::lowerForALUInt64(
+    LInstructionHelper<INT64_PIECES, INT64_PIECES, 0>* ins, MDefinition* mir,
+    MDefinition* input) {
+  ins->setInt64Operand(0, useInt64RegisterAtStart(input));
+  defineInt64ReuseInput(ins, mir, 0);
+}
+
+void LIRGeneratorRiscv64::lowerForALUInt64(
+    LInstructionHelper<INT64_PIECES, 2 * INT64_PIECES, 0>* ins,
+    MDefinition* mir, MDefinition* lhs, MDefinition* rhs) {
+  ins->setInt64Operand(0, useInt64RegisterAtStart(lhs));
+  ins->setInt64Operand(INT64_PIECES, willHaveDifferentLIRNodes(lhs, rhs)
+                                         ? useInt64OrConstant(rhs)
+                                         : useInt64OrConstantAtStart(rhs));
+  defineInt64ReuseInput(ins, mir, 0);
+}
+
+void LIRGeneratorRiscv64::lowerForMulInt64(LMulI64* ins, MMul* mir,
+                                           MDefinition* lhs, MDefinition* rhs) {
+  bool needsTemp = false;
+  bool cannotAliasRhs = false;
+  bool reuseInput = true;
+
+  ins->setInt64Operand(0, useInt64RegisterAtStart(lhs));
+  ins->setInt64Operand(INT64_PIECES,
+                       (willHaveDifferentLIRNodes(lhs, rhs) || cannotAliasRhs)
+                           ? useInt64OrConstant(rhs)
+                           : useInt64OrConstantAtStart(rhs));
+
+  if (needsTemp) {
+    ins->setTemp(0, temp());
+  }
+  if (reuseInput) {
+    defineInt64ReuseInput(ins, mir, 0);
+  } else {
+    defineInt64(ins, mir);
+  }
+}
+
+void LIRGeneratorRiscv64::lowerForFPU(LInstructionHelper<1, 1, 0>* ins,
+                                      MDefinition* mir, MDefinition* input) {
+  ins->setOperand(0, useRegister(input));
+  define(
+      ins, mir,
+      LDefinition(LDefinition::TypeFrom(mir->type()), LDefinition::REGISTER));
+}
+
+template <size_t Temps>
+void LIRGeneratorRiscv64::lowerForFPU(LInstructionHelper<1, 2, Temps>* ins,
+                                      MDefinition* mir, MDefinition* lhs,
+                                      MDefinition* rhs) {
+  ins->setOperand(0, useRegister(lhs));
+  ins->setOperand(1, useRegister(rhs));
+  define(
+      ins, mir,
+      LDefinition(LDefinition::TypeFrom(mir->type()), LDefinition::REGISTER));
+}
+
+template void LIRGeneratorRiscv64::lowerForFPU(LInstructionHelper<1, 2, 0>* ins,
+                                               MDefinition* mir,
+                                               MDefinition* lhs,
+                                               MDefinition* rhs);
+template void LIRGeneratorRiscv64::lowerForFPU(LInstructionHelper<1, 2, 1>* ins,
+                                               MDefinition* mir,
+                                               MDefinition* lhs,
+                                               MDefinition* rhs);
+
+void LIRGeneratorRiscv64::lowerForCompareI64AndBranch(
+    MTest* mir, MCompare* comp, JSOp op, MDefinition* left, MDefinition* right,
+    MBasicBlock* ifTrue, MBasicBlock* ifFalse) {
+  LCompareI64AndBranch* lir = new (alloc())
+      LCompareI64AndBranch(comp, op, useInt64Register(left),
+                           useInt64OrConstant(right), ifTrue, ifFalse);
+  add(lir, mir);
+}
+
+void LIRGeneratorRiscv64::lowerForBitAndAndBranch(LBitAndAndBranch* baab,
+                                                  MInstruction* mir,
+                                                  MDefinition* lhs,
+                                                  MDefinition* rhs) {
+  baab->setOperand(0, useRegisterAtStart(lhs));
+  baab->setOperand(1, useRegisterOrConstantAtStart(rhs));
+  add(baab, mir);
+}
+
+LBoxAllocation LIRGeneratorRiscv64::useBoxFixed(MDefinition* mir, Register reg1,
+                                                Register reg2,
+                                                bool useAtStart) {
+  MOZ_ASSERT(mir->type() == MIRType::Value);
+
+  ensureDefined(mir);
+  return LBoxAllocation(LUse(reg1, mir->virtualRegister(), useAtStart));
+}
+
+LAllocation LIRGeneratorRiscv64::useByteOpRegister(MDefinition* mir) {
+  return useRegister(mir);
+}
+
+LAllocation LIRGeneratorRiscv64::useByteOpRegisterAtStart(MDefinition* mir) {
+  return useRegisterAtStart(mir);
+}
+
+LAllocation LIRGeneratorRiscv64::useByteOpRegisterOrNonDoubleConstant(
+    MDefinition* mir) {
+  return useRegisterOrNonDoubleConstant(mir);
+}
+
+LDefinition LIRGeneratorRiscv64::tempByteOpRegister() { return temp(); }
+LDefinition LIRGeneratorRiscv64::tempToUnbox() { return temp(); }
+
+void LIRGeneratorRiscv64::lowerUntypedPhiInput(MPhi* phi,
+                                               uint32_t inputPosition,
+                                               LBlock* block, size_t lirIndex) {
+  lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
+}
+void LIRGeneratorRiscv64::lowerInt64PhiInput(MPhi* phi, uint32_t inputPosition,
+                                             LBlock* block, size_t lirIndex) {
+  lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
+}
+void LIRGeneratorRiscv64::defineInt64Phi(MPhi* phi, size_t lirIndex) {
+  defineTypedPhi(phi, lirIndex);
+}
+
+void LIRGeneratorRiscv64::lowerNegI(MInstruction* ins, MDefinition* input) {
+  define(new (alloc()) LNegI(useRegisterAtStart(input)), ins);
+}
+void LIRGeneratorRiscv64::lowerNegI64(MInstruction* ins, MDefinition* input) {
+  defineInt64ReuseInput(new (alloc()) LNegI64(useInt64RegisterAtStart(input)),
+                        ins, 0);
+}
+
+void LIRGeneratorRiscv64::lowerMulI(MMul* mul, MDefinition* lhs,
+                                    MDefinition* rhs) {
+  LMulI* lir = new (alloc()) LMulI;
+  if (mul->fallible()) {
+    assignSnapshot(lir, mul->bailoutKind());
+  }
+
+  lowerForALU(lir, mul, lhs, rhs);
+}
+
+void LIRGeneratorRiscv64::lowerDivI(MDiv* div) {
+  if (div->isUnsigned()) {
+    lowerUDiv(div);
+    return;
+  }
+
+  // Division instructions are slow. Division by constant denominators can be
+  // rewritten to use other instructions.
+  if (div->rhs()->isConstant()) {
+    int32_t rhs = div->rhs()->toConstant()->toInt32();
+    // Check for division by a positive power of two, which is an easy and
+    // important case to optimize. Note that other optimizations are also
+    // possible; division by negative powers of two can be optimized in a
+    // similar manner as positive powers of two, and division by other
+    // constants can be optimized by a reciprocal multiplication technique.
+    int32_t shift = FloorLog2(rhs);
+    if (rhs > 0 && 1 << shift == rhs) {
+      LDivPowTwoI* lir =
+          new (alloc()) LDivPowTwoI(useRegister(div->lhs()), shift, temp());
+      if (div->fallible()) {
+        assignSnapshot(lir, div->bailoutKind());
+      }
+      define(lir, div);
+      return;
+    }
+  }
+
+  LDivI* lir = new (alloc())
+      LDivI(useRegister(div->lhs()), useRegister(div->rhs()), temp());
+  if (div->fallible()) {
+    assignSnapshot(lir, div->bailoutKind());
+  }
+  define(lir, div);
+}
+
+void LIRGeneratorRiscv64::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 LIRGeneratorRiscv64::lowerModI(MMod* mod) {
+  if (mod->isUnsigned()) {
+    lowerUMod(mod);
+    return;
+  }
+
+  if (mod->rhs()->isConstant()) {
+    int32_t rhs = mod->rhs()->toConstant()->toInt32();
+    int32_t shift = FloorLog2(rhs);
+    if (rhs > 0 && 1 << shift == rhs) {
+      LModPowTwoI* lir =
+          new (alloc()) LModPowTwoI(useRegister(mod->lhs()), shift);
+      if (mod->fallible()) {
+        assignSnapshot(lir, mod->bailoutKind());
+      }
+      define(lir, mod);
+      return;
+    } else if (shift < 31 && (1 << (shift + 1)) - 1 == rhs) {
+      LModMaskI* lir = new (alloc())
+          LModMaskI(useRegister(mod->lhs()), temp(LDefinition::GENERAL),
+                    temp(LDefinition::GENERAL), shift + 1);
+      if (mod->fallible()) {
+        assignSnapshot(lir, mod->bailoutKind());
+      }
+      define(lir, mod);
+      return;
+    }
+  }
+  LModI* lir =
+      new (alloc()) LModI(useRegister(mod->lhs()), useRegister(mod->rhs()),
+                          temp(LDefinition::GENERAL));
+
+  if (mod->fallible()) {
+    assignSnapshot(lir, mod->bailoutKind());
+  }
+  define(lir, mod);
+}
+
+void LIRGeneratorRiscv64::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 LIRGeneratorRiscv64::lowerUDiv(MDiv* div) {
+  MDefinition* lhs = div->getOperand(0);
+  MDefinition* rhs = div->getOperand(1);
+
+  LUDivOrMod* lir = new (alloc()) LUDivOrMod;
+  lir->setOperand(0, useRegister(lhs));
+  lir->setOperand(1, useRegister(rhs));
+  if (div->fallible()) {
+    assignSnapshot(lir, div->bailoutKind());
+  }
+
+  define(lir, div);
+}
+
+void LIRGeneratorRiscv64::lowerUDivI64(MDiv* div) {
+  LUDivOrModI64* lir = new (alloc())
+      LUDivOrModI64(useRegister(div->lhs()), useRegister(div->rhs()), temp());
+  defineInt64(lir, div);
+}
+
+void LIRGeneratorRiscv64::lowerUMod(MMod* mod) {
+  MDefinition* lhs = mod->getOperand(0);
+  MDefinition* rhs = mod->getOperand(1);
+
+  LUDivOrMod* lir = new (alloc()) LUDivOrMod;
+  lir->setOperand(0, useRegister(lhs));
+  lir->setOperand(1, useRegister(rhs));
+  if (mod->fallible()) {
+    assignSnapshot(lir, mod->bailoutKind());
+  }
+
+  define(lir, mod);
+}
+
+void LIRGeneratorRiscv64::lowerUModI64(MMod* mod) {
+  LUDivOrModI64* lir = new (alloc())
+      LUDivOrModI64(useRegister(mod->lhs()), useRegister(mod->rhs()), temp());
+  defineInt64(lir, mod);
+}
+
+void LIRGeneratorRiscv64::lowerUrshD(MUrsh* mir) {
+  MDefinition* lhs = mir->lhs();
+  MDefinition* rhs = mir->rhs();
+
+  MOZ_ASSERT(lhs->type() == MIRType::Int32);
+  MOZ_ASSERT(rhs->type() == MIRType::Int32);
+
+  LUrshD* lir = new (alloc())
+      LUrshD(useRegister(lhs), useRegisterOrConstant(rhs), temp());
+  define(lir, mir);
+}
+
+void LIRGeneratorRiscv64::lowerPowOfTwoI(MPow* mir) {
+  int32_t base = mir->input()->toConstant()->toInt32();
+  MDefinition* power = mir->power();
+
+  auto* lir = new (alloc()) LPowOfTwoI(useRegister(power), base);
+  assignSnapshot(lir, mir->bailoutKind());
+  define(lir, mir);
+}
+
+void LIRGeneratorRiscv64::lowerBigIntDiv(MBigIntDiv* ins) {
+  auto* lir = new (alloc()) LBigIntDiv(useRegister(ins->lhs()),
+                                       useRegister(ins->rhs()), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorRiscv64::lowerBigIntMod(MBigIntMod* ins) {
+  auto* lir = new (alloc()) LBigIntMod(useRegister(ins->lhs()),
+                                       useRegister(ins->rhs()), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorRiscv64::lowerBigIntLsh(MBigIntLsh* ins) {
+  auto* lir = new (alloc()) LBigIntLsh(
+      useRegister(ins->lhs()), useRegister(ins->rhs()), temp(), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorRiscv64::lowerBigIntRsh(MBigIntRsh* ins) {
+  auto* lir = new (alloc()) LBigIntRsh(
+      useRegister(ins->lhs()), useRegister(ins->rhs()), temp(), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorRiscv64::lowerTruncateDToInt32(MTruncateToInt32* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Double);
+
+  define(new (alloc()) LTruncateDToInt32(useRegister(opd), tempDouble()), ins);
+}
+
+void LIRGeneratorRiscv64::lowerTruncateFToInt32(MTruncateToInt32* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Float32);
+
+  define(new (alloc()) LTruncateFToInt32(useRegister(opd), tempFloat32()), ins);
+}
+
+void LIRGeneratorRiscv64::lowerBuiltinInt64ToFloatingPoint(
+    MBuiltinInt64ToFloatingPoint* ins) {
+  MOZ_CRASH("We don't use it for this architecture");
+}
+
+void LIRGeneratorRiscv64::lowerWasmSelectI(MWasmSelect* select) {
+  auto* lir = new (alloc())
+      LWasmSelect(useRegisterAtStart(select->trueExpr()),
+                  useAny(select->falseExpr()), useRegister(select->condExpr()));
+  defineReuseInput(lir, select, LWasmSelect::TrueExprIndex);
+}
+
+void LIRGeneratorRiscv64::lowerWasmSelectI64(MWasmSelect* select) {
+  auto* lir = new (alloc()) LWasmSelectI64(
+      useInt64RegisterAtStart(select->trueExpr()),
+      useInt64(select->falseExpr()), useRegister(select->condExpr()));
+  defineInt64ReuseInput(lir, select, LWasmSelectI64::TrueExprIndex);
+}
+
+// On riscv we specialize the only cases where compare is {U,}Int32 and select
+// is {U,}Int32.
+bool LIRGeneratorShared::canSpecializeWasmCompareAndSelect(
+    MCompare::CompareType compTy, MIRType insTy) {
+  return insTy == MIRType::Int32 && (compTy == MCompare::Compare_Int32 ||
+                                     compTy == MCompare::Compare_UInt32);
+}
+
+void LIRGeneratorShared::lowerWasmCompareAndSelect(MWasmSelect* ins,
+                                                   MDefinition* lhs,
+                                                   MDefinition* rhs,
+                                                   MCompare::CompareType compTy,
+                                                   JSOp jsop) {
+  MOZ_ASSERT(canSpecializeWasmCompareAndSelect(compTy, ins->type()));
+  auto* lir = new (alloc()) LWasmCompareAndSelect(
+      useRegister(lhs), useRegister(rhs), compTy, jsop,
+      useRegisterAtStart(ins->trueExpr()), useRegister(ins->falseExpr()));
+  defineReuseInput(lir, ins, LWasmCompareAndSelect::IfTrueExprIndex);
+}
+
+void LIRGeneratorRiscv64::lowerWasmBuiltinTruncateToInt32(
+    MWasmBuiltinTruncateToInt32* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Double || opd->type() == MIRType::Float32);
+
+  if (opd->type() == MIRType::Double) {
+    define(new (alloc()) LWasmBuiltinTruncateDToInt32(
+               useRegister(opd), useFixed(ins->instance(), InstanceReg),
+               LDefinition::BogusTemp()),
+           ins);
+    return;
+  }
+
+  define(new (alloc()) LWasmBuiltinTruncateFToInt32(
+             useRegister(opd), useFixed(ins->instance(), InstanceReg),
+             LDefinition::BogusTemp()),
+         ins);
+}
+
+void LIRGeneratorRiscv64::lowerWasmBuiltinTruncateToInt64(
+    MWasmBuiltinTruncateToInt64* ins) {
+  MOZ_CRASH("We don't use it for this architecture");
+}
+
+void LIRGeneratorRiscv64::lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div) {
+  MOZ_CRASH("We don't use runtime div for this architecture");
+}
+
+void LIRGeneratorRiscv64::lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod) {
+  MOZ_CRASH("We don't use runtime mod for this architecture");
+}
+
+void LIRGeneratorRiscv64::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 LIRGeneratorRiscv64::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::visitAbs(MAbs* ins) {
+  define(allocateAbs(ins, useRegisterAtStart(ins->input())), ins);
+}
+
+void LIRGenerator::visitCopySign(MCopySign* ins) {
+  MDefinition* lhs = ins->lhs();
+  MDefinition* rhs = ins->rhs();
+
+  MOZ_ASSERT(IsFloatingPointType(lhs->type()));
+  MOZ_ASSERT(lhs->type() == rhs->type());
+  MOZ_ASSERT(lhs->type() == ins->type());
+
+  LInstructionHelper<1, 2, 2>* lir;
+  if (lhs->type() == MIRType::Double) {
+    lir = new (alloc()) LCopySignD();
+  } else {
+    lir = new (alloc()) LCopySignF();
+  }
+
+  lir->setTemp(0, temp());
+  lir->setTemp(1, temp());
+
+  lir->setOperand(0, useRegisterAtStart(lhs));
+  lir->setOperand(1, useRegister(rhs));
+  defineReuseInput(lir, ins, 0);
+}
+
+void LIRGenerator::visitPowHalf(MPowHalf* ins) {
+  MDefinition* input = ins->input();
+  MOZ_ASSERT(input->type() == MIRType::Double);
+  LPowHalfD* lir = new (alloc()) LPowHalfD(useRegisterAtStart(input));
+  defineReuseInput(lir, ins, 0);
+}
+
+void LIRGenerator::visitExtendInt32ToInt64(MExtendInt32ToInt64* ins) {
+  defineInt64(
+      new (alloc()) LExtendInt32ToInt64(useRegisterAtStart(ins->input())), ins);
+}
+
+void LIRGenerator::visitSignExtendInt64(MSignExtendInt64* ins) {
+  defineInt64(new (alloc())
+                  LSignExtendInt64(useInt64RegisterAtStart(ins->input())),
+              ins);
+}
+
+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 LIRGenerator::visitSubstr(MSubstr* ins) {
+  LSubstr* lir = new (alloc())
+      LSubstr(useRegister(ins->string()), useRegister(ins->begin()),
+              useRegister(ins->length()), temp(), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGenerator::visitCompareExchangeTypedArrayElement(
+    MCompareExchangeTypedArrayElement* ins) {
+  MOZ_ASSERT(ins->arrayType() != Scalar::Float32);
+  MOZ_ASSERT(ins->arrayType() != Scalar::Float64);
+
+  MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+  MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+  const LUse elements = useRegister(ins->elements());
+  const LAllocation index =
+      useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+
+  const LAllocation newval = useRegister(ins->newval());
+  const LAllocation oldval = useRegister(ins->oldval());
+
+  if (Scalar::isBigIntType(ins->arrayType())) {
+    LInt64Definition temp1 = tempInt64();
+    LInt64Definition temp2 = tempInt64();
+
+    auto* lir = new (alloc()) LCompareExchangeTypedArrayElement64(
+        elements, index, oldval, newval, temp1, temp2);
+    define(lir, ins);
+    assignSafepoint(lir, ins);
+    return;
+  }
+
+  // If the target is a floating register then we need a temp at the
+  // CodeGenerator level for creating the result.
+
+  LDefinition outTemp = LDefinition::BogusTemp();
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (ins->arrayType() == Scalar::Uint32 && IsFloatingPointType(ins->type())) {
+    outTemp = temp();
+  }
+
+  if (Scalar::byteSize(ins->arrayType()) < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  LCompareExchangeTypedArrayElement* lir = new (alloc())
+      LCompareExchangeTypedArrayElement(elements, index, oldval, newval,
+                                        outTemp, valueTemp, offsetTemp,
+                                        maskTemp);
+
+  define(lir, ins);
+}
+
+void LIRGenerator::visitAtomicExchangeTypedArrayElement(
+    MAtomicExchangeTypedArrayElement* ins) {
+  MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+  MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+  const LUse elements = useRegister(ins->elements());
+  const LAllocation index =
+      useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+
+  const LAllocation value = useRegister(ins->value());
+
+  if (Scalar::isBigIntType(ins->arrayType())) {
+    LInt64Definition temp1 = tempInt64();
+    LDefinition temp2 = temp();
+
+    auto* lir = new (alloc()) LAtomicExchangeTypedArrayElement64(
+        elements, index, value, temp1, temp2);
+    define(lir, ins);
+    assignSafepoint(lir, ins);
+    return;
+  }
+
+  // If the target is a floating register then we need a temp at the
+  // CodeGenerator level for creating the result.
+
+  MOZ_ASSERT(ins->arrayType() <= Scalar::Uint32);
+
+  LDefinition outTemp = LDefinition::BogusTemp();
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (ins->arrayType() == Scalar::Uint32) {
+    MOZ_ASSERT(ins->type() == MIRType::Double);
+    outTemp = temp();
+  }
+
+  if (Scalar::byteSize(ins->arrayType()) < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  LAtomicExchangeTypedArrayElement* lir =
+      new (alloc()) LAtomicExchangeTypedArrayElement(
+          elements, index, value, outTemp, valueTemp, offsetTemp, maskTemp);
+
+  define(lir, ins);
+}
+
+void LIRGenerator::visitAtomicTypedArrayElementBinop(
+    MAtomicTypedArrayElementBinop* ins) {
+  MOZ_ASSERT(ins->arrayType() != Scalar::Uint8Clamped);
+  MOZ_ASSERT(ins->arrayType() != Scalar::Float32);
+  MOZ_ASSERT(ins->arrayType() != Scalar::Float64);
+
+  MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+  MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+  const LUse elements = useRegister(ins->elements());
+  const LAllocation index =
+      useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+  const LAllocation value = useRegister(ins->value());
+
+  if (Scalar::isBigIntType(ins->arrayType())) {
+    LInt64Definition temp1 = tempInt64();
+    LInt64Definition temp2 = tempInt64();
+
+    // Case 1: the result of the operation is not used.
+    //
+    // We can omit allocating the result BigInt.
+
+    if (ins->isForEffect()) {
+      auto* lir = new (alloc()) LAtomicTypedArrayElementBinopForEffect64(
+          elements, index, value, temp1, temp2);
+      add(lir, ins);
+      return;
+    }
+
+    // Case 2: the result of the operation is used.
+
+    auto* lir = new (alloc())
+        LAtomicTypedArrayElementBinop64(elements, index, value, temp1, temp2);
+    define(lir, ins);
+    assignSafepoint(lir, ins);
+    return;
+  }
+
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (Scalar::byteSize(ins->arrayType()) < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  if (ins->isForEffect()) {
+    LAtomicTypedArrayElementBinopForEffect* lir =
+        new (alloc()) LAtomicTypedArrayElementBinopForEffect(
+            elements, index, value, valueTemp, offsetTemp, maskTemp);
+    add(lir, ins);
+    return;
+  }
+
+  // For a Uint32Array with a known double result we need a temp for
+  // the intermediate output.
+
+  LDefinition outTemp = LDefinition::BogusTemp();
+
+  if (ins->arrayType() == Scalar::Uint32 && IsFloatingPointType(ins->type())) {
+    outTemp = temp();
+  }
+
+  LAtomicTypedArrayElementBinop* lir =
+      new (alloc()) LAtomicTypedArrayElementBinop(
+          elements, index, value, outTemp, valueTemp, offsetTemp, maskTemp);
+  define(lir, ins);
+}
+
+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 LIRGenerator::visitAsmJSLoadHeap(MAsmJSLoadHeap* ins) {
+  MDefinition* base = ins->base();
+  MOZ_ASSERT(base->type() == MIRType::Int32);
+
+  MDefinition* boundsCheckLimit = ins->boundsCheckLimit();
+  MOZ_ASSERT_IF(ins->needsBoundsCheck(),
+                boundsCheckLimit->type() == MIRType::Int32);
+
+  LAllocation baseAlloc = useRegisterAtStart(base);
+
+  LAllocation limitAlloc = ins->needsBoundsCheck()
+                               ? useRegisterAtStart(boundsCheckLimit)
+                               : LAllocation();
+
+  // We have no memory-base value, meaning that HeapReg is to be used as the
+  // memory base.  This follows from the definition of
+  // FunctionCompiler::maybeLoadMemoryBase() in WasmIonCompile.cpp.
+  MOZ_ASSERT(!ins->hasMemoryBase());
+  auto* lir =
+      new (alloc()) LAsmJSLoadHeap(baseAlloc, limitAlloc, LAllocation());
+  define(lir, ins);
+}
+
+void LIRGenerator::visitAsmJSStoreHeap(MAsmJSStoreHeap* ins) {
+  MDefinition* base = ins->base();
+  MOZ_ASSERT(base->type() == MIRType::Int32);
+
+  MDefinition* boundsCheckLimit = ins->boundsCheckLimit();
+  MOZ_ASSERT_IF(ins->needsBoundsCheck(),
+                boundsCheckLimit->type() == MIRType::Int32);
+
+  LAllocation baseAlloc = useRegisterAtStart(base);
+
+  LAllocation limitAlloc = ins->needsBoundsCheck()
+                               ? useRegisterAtStart(boundsCheckLimit)
+                               : LAllocation();
+
+  // See comment in LIRGenerator::visitAsmJSStoreHeap just above.
+  MOZ_ASSERT(!ins->hasMemoryBase());
+  add(new (alloc()) LAsmJSStoreHeap(baseAlloc, useRegisterAtStart(ins->value()),
+                                    limitAlloc, LAllocation()),
+      ins);
+}
+
+void LIRGenerator::visitWasmLoad(MWasmLoad* ins) {
+  MDefinition* base = ins->base();
+  // 'base' is a GPR but may be of either type. If it is 32-bit, it is
+  // sign-extended on riscv64 platform and we should explicitly promote it
+  // to 64-bit by zero-extension when use it as an index register in memory
+  // accesses.
+  MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+  LAllocation memoryBase =
+      ins->hasMemoryBase() ? LAllocation(useRegisterAtStart(ins->memoryBase()))
+                           : LGeneralReg(HeapReg);
+  LAllocation ptr;
+  ptr = useRegisterAtStart(base);
+
+  if (ins->type() == MIRType::Int64) {
+    auto* lir = new (alloc()) LWasmLoadI64(ptr, memoryBase);
+    if (ins->access().offset()) {
+      lir->setTemp(0, tempCopy(base, 0));
+    }
+
+    defineInt64(lir, ins);
+    return;
+  }
+
+  auto* lir = new (alloc()) LWasmLoad(ptr, memoryBase);
+  if (ins->access().offset()) {
+    lir->setTemp(0, tempCopy(base, 0));
+  }
+
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmStore(MWasmStore* ins) {
+  MDefinition* base = ins->base();
+  // See comment in visitWasmLoad re the type of 'base'.
+  MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+  MDefinition* value = ins->value();
+
+  LAllocation memoryBase =
+      ins->hasMemoryBase() ? LAllocation(useRegisterAtStart(ins->memoryBase()))
+                           : LGeneralReg(HeapReg);
+
+  if (ins->access().type() == Scalar::Int64) {
+    LAllocation baseAlloc = useRegisterAtStart(base);
+    LInt64Allocation valueAlloc = useInt64RegisterAtStart(value);
+    auto* lir = new (alloc()) LWasmStoreI64(baseAlloc, valueAlloc, memoryBase);
+    if (ins->access().offset()) {
+      lir->setTemp(0, tempCopy(base, 0));
+    }
+
+    add(lir, ins);
+    return;
+  }
+
+  LAllocation baseAlloc = useRegisterAtStart(base);
+  LAllocation valueAlloc = useRegisterAtStart(value);
+  auto* lir = new (alloc()) LWasmStore(baseAlloc, valueAlloc, memoryBase);
+  if (ins->access().offset()) {
+    lir->setTemp(0, tempCopy(base, 0));
+  }
+
+  add(lir, ins);
+}
+
+void LIRGenerator::visitWasmNeg(MWasmNeg* ins) {
+  if (ins->type() == MIRType::Int32) {
+    define(new (alloc()) LNegI(useRegisterAtStart(ins->input())), ins);
+  } else if (ins->type() == MIRType::Float32) {
+    define(new (alloc()) LNegF(useRegisterAtStart(ins->input())), ins);
+  } else {
+    MOZ_ASSERT(ins->type() == MIRType::Double);
+    define(new (alloc()) LNegD(useRegisterAtStart(ins->input())), 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 LIRGenerator::visitWasmUnsignedToDouble(MWasmUnsignedToDouble* ins) {
+  MOZ_ASSERT(ins->input()->type() == MIRType::Int32);
+  LWasmUint32ToDouble* lir =
+      new (alloc()) LWasmUint32ToDouble(useRegisterAtStart(ins->input()));
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmUnsignedToFloat32(MWasmUnsignedToFloat32* ins) {
+  MOZ_ASSERT(ins->input()->type() == MIRType::Int32);
+  LWasmUint32ToFloat32* lir =
+      new (alloc()) LWasmUint32ToFloat32(useRegisterAtStart(ins->input()));
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmCompareExchangeHeap(MWasmCompareExchangeHeap* ins) {
+  MDefinition* base = ins->base();
+  // See comment in visitWasmLoad re the type of 'base'.
+  MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+  LAllocation memoryBase =
+      ins->hasMemoryBase() ? LAllocation(useRegisterAtStart(ins->memoryBase()))
+                           : LGeneralReg(HeapReg);
+  if (ins->access().type() == Scalar::Int64) {
+    auto* lir = new (alloc()) LWasmCompareExchangeI64(
+        useRegister(base), useInt64Register(ins->oldValue()),
+        useInt64Register(ins->newValue()), memoryBase);
+    defineInt64(lir, ins);
+    return;
+  }
+
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (ins->access().byteSize() < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  LWasmCompareExchangeHeap* lir = new (alloc())
+      LWasmCompareExchangeHeap(useRegister(base), useRegister(ins->oldValue()),
+                               useRegister(ins->newValue()), valueTemp,
+                               offsetTemp, maskTemp, memoryBase);
+
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmAtomicExchangeHeap(MWasmAtomicExchangeHeap* ins) {
+  MDefinition* base = ins->base();
+  // See comment in visitWasmLoad re the type of 'base'.
+  MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+  LAllocation memoryBase =
+      ins->hasMemoryBase() ? LAllocation(useRegisterAtStart(ins->memoryBase()))
+                           : LGeneralReg(HeapReg);
+
+  if (ins->access().type() == Scalar::Int64) {
+    auto* lir = new (alloc()) LWasmAtomicExchangeI64(
+        useRegister(base), useInt64Register(ins->value()), memoryBase);
+    defineInt64(lir, ins);
+    return;
+  }
+
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (ins->access().byteSize() < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  LWasmAtomicExchangeHeap* lir = new (alloc())
+      LWasmAtomicExchangeHeap(useRegister(base), useRegister(ins->value()),
+                              valueTemp, offsetTemp, maskTemp, memoryBase);
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmAtomicBinopHeap(MWasmAtomicBinopHeap* ins) {
+  MDefinition* base = ins->base();
+  // See comment in visitWasmLoad re the type of 'base'.
+  MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+  LAllocation memoryBase =
+      ins->hasMemoryBase() ? LAllocation(useRegisterAtStart(ins->memoryBase()))
+                           : LGeneralReg(HeapReg);
+
+  if (ins->access().type() == Scalar::Int64) {
+    auto* lir = new (alloc()) LWasmAtomicBinopI64(
+        useRegister(base), useInt64Register(ins->value()), memoryBase);
+    lir->setTemp(0, temp());
+    defineInt64(lir, ins);
+    return;
+  }
+
+  LDefinition valueTemp = LDefinition::BogusTemp();
+  LDefinition offsetTemp = LDefinition::BogusTemp();
+  LDefinition maskTemp = LDefinition::BogusTemp();
+
+  if (ins->access().byteSize() < 4) {
+    valueTemp = temp();
+    offsetTemp = temp();
+    maskTemp = temp();
+  }
+
+  if (!ins->hasUses()) {
+    LWasmAtomicBinopHeapForEffect* lir = new (alloc())
+        LWasmAtomicBinopHeapForEffect(useRegister(base),
+                                      useRegister(ins->value()), valueTemp,
+                                      offsetTemp, maskTemp, memoryBase);
+    add(lir, ins);
+    return;
+  }
+
+  LWasmAtomicBinopHeap* lir = new (alloc())
+      LWasmAtomicBinopHeap(useRegister(base), useRegister(ins->value()),
+                           valueTemp, offsetTemp, maskTemp, memoryBase);
+
+  define(lir, ins);
+}
+
+void LIRGenerator::visitWasmTernarySimd128(MWasmTernarySimd128* ins) {
+  MOZ_CRASH("ternary SIMD NYI");
+}
+
+void LIRGenerator::visitWasmBinarySimd128(MWasmBinarySimd128* ins) {
+  MOZ_CRASH("binary SIMD NYI");
+}
+
+#ifdef ENABLE_WASM_SIMD
+bool MWasmTernarySimd128::specializeBitselectConstantMaskAsShuffle(
+    int8_t shuffle[16]) {
+  return false;
+}
+#endif
+
+bool MWasmBinarySimd128::specializeForConstantRhs() {
+  // Probably many we want to do here
+  return false;
+}
+
+void LIRGenerator::visitWasmBinarySimd128WithConstant(
+    MWasmBinarySimd128WithConstant* ins) {
+  MOZ_CRASH("binary SIMD with constant NYI");
+}
+
+void LIRGenerator::visitWasmShiftSimd128(MWasmShiftSimd128* ins) {
+  MOZ_CRASH("shift SIMD NYI");
+}
+
+void LIRGenerator::visitWasmShuffleSimd128(MWasmShuffleSimd128* ins) {
+  MOZ_CRASH("shuffle SIMD NYI");
+}
+
+void LIRGenerator::visitWasmReplaceLaneSimd128(MWasmReplaceLaneSimd128* ins) {
+  MOZ_CRASH("replace-lane SIMD NYI");
+}
+
+void LIRGenerator::visitWasmScalarToSimd128(MWasmScalarToSimd128* ins) {
+  MOZ_CRASH("scalar-to-SIMD NYI");
+}
+
+void LIRGenerator::visitWasmUnarySimd128(MWasmUnarySimd128* ins) {
+  MOZ_CRASH("unary SIMD NYI");
+}
+
+void LIRGenerator::visitWasmReduceSimd128(MWasmReduceSimd128* ins) {
+  MOZ_CRASH("reduce-SIMD NYI");
+}
+
+void LIRGenerator::visitWasmLoadLaneSimd128(MWasmLoadLaneSimd128* ins) {
+  MOZ_CRASH("load-lane SIMD NYI");
+}
+
+void LIRGenerator::visitWasmStoreLaneSimd128(MWasmStoreLaneSimd128* ins) {
+  MOZ_CRASH("store-lane SIMD NYI");
+}