Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 2824 insertions, 0 deletions

diff --git a/js/src/jit/mips32/MacroAssembler-mips32.cpp b/js/src/jit/mips32/MacroAssembler-mips32.cpp
new file mode 100644
index 0000000000..1a96cc60fd
--- /dev/null
+++ b/js/src/jit/mips32/MacroAssembler-mips32.cpp
@@ -0,0 +1,2824 @@
+/* -*- 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/mips32/MacroAssembler-mips32.h"
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/MathAlgorithms.h"
+
+#include "jit/Bailouts.h"
+#include "jit/BaselineFrame.h"
+#include "jit/JitFrames.h"
+#include "jit/JitRuntime.h"
+#include "jit/MacroAssembler.h"
+#include "jit/mips32/Simulator-mips32.h"
+#include "jit/MoveEmitter.h"
+#include "jit/SharedICRegisters.h"
+#include "util/Memory.h"
+#include "vm/JitActivation.h"  // js::jit::JitActivation
+#include "vm/JSContext.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+using namespace js;
+using namespace jit;
+
+using mozilla::Abs;
+
+static const int32_t PAYLOAD_OFFSET = NUNBOX32_PAYLOAD_OFFSET;
+static const int32_t TAG_OFFSET = NUNBOX32_TYPE_OFFSET;
+
+static_assert(sizeof(intptr_t) == 4, "Not 64-bit clean.");
+
+void MacroAssemblerMIPSCompat::convertBoolToInt32(Register src, Register dest) {
+  // Note that C++ bool is only 1 byte, so zero extend it to clear the
+  // higher-order bits.
+  ma_and(dest, src, Imm32(0xff));
+}
+
+void MacroAssemblerMIPSCompat::convertInt32ToDouble(Register src,
+                                                    FloatRegister dest) {
+  as_mtc1(src, dest);
+  as_cvtdw(dest, dest);
+}
+
+void MacroAssemblerMIPSCompat::convertInt32ToDouble(const Address& src,
+                                                    FloatRegister dest) {
+  ma_ls(dest, src);
+  as_cvtdw(dest, dest);
+}
+
+void MacroAssemblerMIPSCompat::convertInt32ToDouble(const BaseIndex& src,
+                                                    FloatRegister dest) {
+  computeScaledAddress(src, ScratchRegister);
+  convertInt32ToDouble(Address(ScratchRegister, src.offset), dest);
+}
+
+void MacroAssemblerMIPSCompat::convertUInt32ToDouble(Register src,
+                                                     FloatRegister dest) {
+  Label positive, done;
+  ma_b(src, src, &positive, NotSigned, ShortJump);
+
+  const uint32_t kExponentShift =
+      mozilla::FloatingPoint<double>::kExponentShift - 32;
+  const uint32_t kExponent =
+      (31 + mozilla::FloatingPoint<double>::kExponentBias);
+
+  ma_ext(SecondScratchReg, src, 31 - kExponentShift, kExponentShift);
+  ma_li(ScratchRegister, Imm32(kExponent << kExponentShift));
+  ma_or(SecondScratchReg, ScratchRegister);
+  ma_sll(ScratchRegister, src, Imm32(kExponentShift + 1));
+  moveToDoubleHi(SecondScratchReg, dest);
+  moveToDoubleLo(ScratchRegister, dest);
+
+  ma_b(&done, ShortJump);
+
+  bind(&positive);
+  convertInt32ToDouble(src, dest);
+
+  bind(&done);
+}
+
+void MacroAssemblerMIPSCompat::convertUInt32ToFloat32(Register src,
+                                                      FloatRegister dest) {
+  Label positive, done;
+  ma_b(src, src, &positive, NotSigned, ShortJump);
+
+  const uint32_t kExponentShift =
+      mozilla::FloatingPoint<double>::kExponentShift - 32;
+  const uint32_t kExponent =
+      (31 + mozilla::FloatingPoint<double>::kExponentBias);
+
+  ma_ext(SecondScratchReg, src, 31 - kExponentShift, kExponentShift);
+  ma_li(ScratchRegister, Imm32(kExponent << kExponentShift));
+  ma_or(SecondScratchReg, ScratchRegister);
+  ma_sll(ScratchRegister, src, Imm32(kExponentShift + 1));
+  FloatRegister destDouble = dest.asDouble();
+  moveToDoubleHi(SecondScratchReg, destDouble);
+  moveToDoubleLo(ScratchRegister, destDouble);
+
+  convertDoubleToFloat32(destDouble, dest);
+
+  ma_b(&done, ShortJump);
+
+  bind(&positive);
+  convertInt32ToFloat32(src, dest);
+
+  bind(&done);
+}
+
+void MacroAssemblerMIPSCompat::convertDoubleToFloat32(FloatRegister src,
+                                                      FloatRegister dest) {
+  as_cvtsd(dest, src);
+}
+
+void MacroAssemblerMIPSCompat::convertDoubleToPtr(FloatRegister src,
+                                                  Register dest, Label* fail,
+                                                  bool negativeZeroCheck) {
+  convertDoubleToInt32(src, dest, fail, negativeZeroCheck);
+}
+
+const int CauseBitPos = int(Assembler::CauseI);
+const int CauseBitCount = 1 + int(Assembler::CauseV) - int(Assembler::CauseI);
+const int CauseIOrVMask = ((1 << int(Assembler::CauseI)) |
+                           (1 << int(Assembler::CauseV))) >>
+                          int(Assembler::CauseI);
+
+// Checks whether a double is representable as a 32-bit integer. If so, the
+// integer is written to the output register. Otherwise, a bailout is taken to
+// the given snapshot. This function overwrites the scratch float register.
+void MacroAssemblerMIPSCompat::convertDoubleToInt32(FloatRegister src,
+                                                    Register dest, Label* fail,
+                                                    bool negativeZeroCheck) {
+  if (negativeZeroCheck) {
+    moveFromDoubleHi(src, dest);
+    moveFromDoubleLo(src, SecondScratchReg);
+    ma_xor(dest, Imm32(INT32_MIN));
+    ma_or(dest, SecondScratchReg);
+    ma_b(dest, Imm32(0), fail, Assembler::Equal);
+  }
+
+  // Truncate double to int ; if result is inexact or invalid fail.
+  as_truncwd(ScratchFloat32Reg, src);
+  as_cfc1(ScratchRegister, Assembler::FCSR);
+  moveFromFloat32(ScratchFloat32Reg, dest);
+  ma_ext(ScratchRegister, ScratchRegister, CauseBitPos, CauseBitCount);
+  // Here adding the masking andi instruction just for a precaution.
+  // For the instruction of trunc.*.*, the Floating Point Exceptions can be
+  // only Inexact, Invalid Operation, Unimplemented Operation.
+  // Leaving it maybe is also ok.
+  as_andi(ScratchRegister, ScratchRegister, CauseIOrVMask);
+  ma_b(ScratchRegister, Imm32(0), fail, Assembler::NotEqual);
+}
+
+// Checks whether a float32 is representable as a 32-bit integer. If so, the
+// integer is written to the output register. Otherwise, a bailout is taken to
+// the given snapshot. This function overwrites the scratch float register.
+void MacroAssemblerMIPSCompat::convertFloat32ToInt32(FloatRegister src,
+                                                     Register dest, Label* fail,
+                                                     bool negativeZeroCheck) {
+  if (negativeZeroCheck) {
+    moveFromFloat32(src, dest);
+    ma_b(dest, Imm32(INT32_MIN), fail, Assembler::Equal);
+  }
+
+  as_truncws(ScratchFloat32Reg, src);
+  as_cfc1(ScratchRegister, Assembler::FCSR);
+  moveFromFloat32(ScratchFloat32Reg, dest);
+  ma_ext(ScratchRegister, ScratchRegister, CauseBitPos, CauseBitCount);
+  as_andi(ScratchRegister, ScratchRegister, CauseIOrVMask);
+  ma_b(ScratchRegister, Imm32(0), fail, Assembler::NotEqual);
+}
+
+void MacroAssemblerMIPSCompat::convertFloat32ToDouble(FloatRegister src,
+                                                      FloatRegister dest) {
+  as_cvtds(dest, src);
+}
+
+void MacroAssemblerMIPSCompat::convertInt32ToFloat32(Register src,
+                                                     FloatRegister dest) {
+  as_mtc1(src, dest);
+  as_cvtsw(dest, dest);
+}
+
+void MacroAssemblerMIPSCompat::convertInt32ToFloat32(const Address& src,
+                                                     FloatRegister dest) {
+  ma_ls(dest, src);
+  as_cvtsw(dest, dest);
+}
+
+void MacroAssemblerMIPS::ma_li(Register dest, CodeLabel* label) {
+  BufferOffset bo = m_buffer.nextOffset();
+  ma_liPatchable(dest, ImmWord(/* placeholder */ 0));
+  label->patchAt()->bind(bo.getOffset());
+  label->setLinkMode(CodeLabel::MoveImmediate);
+}
+
+void MacroAssemblerMIPS::ma_li(Register dest, ImmWord imm) {
+  ma_li(dest, Imm32(uint32_t(imm.value)));
+}
+
+void MacroAssemblerMIPS::ma_liPatchable(Register dest, ImmPtr imm) {
+  ma_liPatchable(dest, ImmWord(uintptr_t(imm.value)));
+}
+
+void MacroAssemblerMIPS::ma_liPatchable(Register dest, ImmWord imm) {
+  ma_liPatchable(dest, Imm32(int32_t(imm.value)));
+}
+
+// Arithmetic-based ops.
+
+// Add.
+void MacroAssemblerMIPS::ma_add32TestOverflow(Register rd, Register rs,
+                                              Register rt, Label* overflow) {
+  MOZ_ASSERT_IF(rs == rd, rs != rt);
+  MOZ_ASSERT(rs != ScratchRegister);
+  MOZ_ASSERT(rt != ScratchRegister);
+  MOZ_ASSERT(rd != rt);
+  MOZ_ASSERT(rd != ScratchRegister);
+  MOZ_ASSERT(rd != SecondScratchReg);
+
+  if (rs == rt) {
+    as_addu(rd, rs, rs);
+    as_xor(SecondScratchReg, rs, rd);
+    ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan);
+    return;
+  }
+
+  // If different sign, no overflow
+  as_xor(ScratchRegister, rs, rt);
+
+  as_addu(rd, rs, rt);
+  as_nor(ScratchRegister, ScratchRegister, zero);
+  // If different sign, then overflow
+  as_xor(SecondScratchReg, rt, rd);
+  as_and(SecondScratchReg, SecondScratchReg, ScratchRegister);
+  ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan);
+}
+
+void MacroAssemblerMIPS::ma_add32TestOverflow(Register rd, Register rs,
+                                              Imm32 imm, Label* overflow) {
+  MOZ_ASSERT(rs != ScratchRegister);
+  MOZ_ASSERT(rs != SecondScratchReg);
+  MOZ_ASSERT(rd != ScratchRegister);
+  MOZ_ASSERT(rd != SecondScratchReg);
+
+  Register rs_copy = rs;
+
+  if (imm.value > 0) {
+    as_nor(ScratchRegister, rs, zero);
+  } else if (rs == rd) {
+    ma_move(ScratchRegister, rs);
+    rs_copy = ScratchRegister;
+  }
+
+  if (Imm16::IsInSignedRange(imm.value)) {
+    as_addiu(rd, rs, imm.value);
+  } else {
+    ma_li(SecondScratchReg, imm);
+    as_addu(rd, rs, SecondScratchReg);
+  }
+
+  if (imm.value > 0) {
+    as_and(ScratchRegister, ScratchRegister, rd);
+  } else {
+    as_nor(SecondScratchReg, rd, zero);
+    as_and(ScratchRegister, rs_copy, SecondScratchReg);
+  }
+
+  ma_b(ScratchRegister, Imm32(0), overflow, Assembler::LessThan);
+}
+
+// Subtract.
+void MacroAssemblerMIPS::ma_sub32TestOverflow(Register rd, Register rs,
+                                              Register rt, Label* overflow) {
+  // The rs == rt case should probably be folded at MIR stage.
+  // Happens for Number_isInteger*. Not worth specializing here.
+  MOZ_ASSERT_IF(rs == rd, rs != rt);
+  MOZ_ASSERT(rs != SecondScratchReg);
+  MOZ_ASSERT(rt != SecondScratchReg);
+  MOZ_ASSERT(rd != rt);
+  MOZ_ASSERT(rd != ScratchRegister);
+  MOZ_ASSERT(rd != SecondScratchReg);
+
+  Register rs_copy = rs;
+
+  if (rs == rd) {
+    ma_move(SecondScratchReg, rs);
+    rs_copy = SecondScratchReg;
+  }
+
+  as_subu(rd, rs, rt);
+  // If same sign, no overflow
+  as_xor(ScratchRegister, rs_copy, rt);
+  // If different sign, then overflow
+  as_xor(SecondScratchReg, rs_copy, rd);
+  as_and(SecondScratchReg, SecondScratchReg, ScratchRegister);
+  ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan);
+}
+
+// Memory.
+
+void MacroAssemblerMIPS::ma_load(Register dest, Address address,
+                                 LoadStoreSize size,
+                                 LoadStoreExtension extension) {
+  int16_t encodedOffset;
+  Register base;
+
+  if (isLoongson() && ZeroExtend != extension &&
+      !Imm16::IsInSignedRange(address.offset)) {
+    ma_li(ScratchRegister, Imm32(address.offset));
+    base = address.base;
+
+    switch (size) {
+      case SizeByte:
+        as_gslbx(dest, base, ScratchRegister, 0);
+        break;
+      case SizeHalfWord:
+        as_gslhx(dest, base, ScratchRegister, 0);
+        break;
+      case SizeWord:
+        as_gslwx(dest, base, ScratchRegister, 0);
+        break;
+      case SizeDouble:
+        as_gsldx(dest, base, ScratchRegister, 0);
+        break;
+      default:
+        MOZ_CRASH("Invalid argument for ma_load");
+    }
+    return;
+  }
+
+  if (!Imm16::IsInSignedRange(address.offset)) {
+    ma_li(ScratchRegister, Imm32(address.offset));
+    as_addu(ScratchRegister, address.base, ScratchRegister);
+    base = ScratchRegister;
+    encodedOffset = Imm16(0).encode();
+  } else {
+    encodedOffset = Imm16(address.offset).encode();
+    base = address.base;
+  }
+
+  switch (size) {
+    case SizeByte:
+      if (ZeroExtend == extension) {
+        as_lbu(dest, base, encodedOffset);
+      } else {
+        as_lb(dest, base, encodedOffset);
+      }
+      break;
+    case SizeHalfWord:
+      if (ZeroExtend == extension) {
+        as_lhu(dest, base, encodedOffset);
+      } else {
+        as_lh(dest, base, encodedOffset);
+      }
+      break;
+    case SizeWord:
+      as_lw(dest, base, encodedOffset);
+      break;
+    default:
+      MOZ_CRASH("Invalid argument for ma_load");
+  }
+}
+
+void MacroAssemblerMIPS::ma_store(Register data, Address address,
+                                  LoadStoreSize size,
+                                  LoadStoreExtension extension) {
+  int16_t encodedOffset;
+  Register base;
+
+  if (isLoongson() && !Imm16::IsInSignedRange(address.offset)) {
+    ma_li(ScratchRegister, Imm32(address.offset));
+    base = address.base;
+
+    switch (size) {
+      case SizeByte:
+        as_gssbx(data, base, ScratchRegister, 0);
+        break;
+      case SizeHalfWord:
+        as_gsshx(data, base, ScratchRegister, 0);
+        break;
+      case SizeWord:
+        as_gsswx(data, base, ScratchRegister, 0);
+        break;
+      case SizeDouble:
+        as_gssdx(data, base, ScratchRegister, 0);
+        break;
+      default:
+        MOZ_CRASH("Invalid argument for ma_store");
+    }
+    return;
+  }
+
+  if (!Imm16::IsInSignedRange(address.offset)) {
+    ma_li(ScratchRegister, Imm32(address.offset));
+    as_addu(ScratchRegister, address.base, ScratchRegister);
+    base = ScratchRegister;
+    encodedOffset = Imm16(0).encode();
+  } else {
+    encodedOffset = Imm16(address.offset).encode();
+    base = address.base;
+  }
+
+  switch (size) {
+    case SizeByte:
+      as_sb(data, base, encodedOffset);
+      break;
+    case SizeHalfWord:
+      as_sh(data, base, encodedOffset);
+      break;
+    case SizeWord:
+      as_sw(data, base, encodedOffset);
+      break;
+    default:
+      MOZ_CRASH("Invalid argument for ma_store");
+  }
+}
+
+void MacroAssemblerMIPSCompat::computeScaledAddress(const BaseIndex& address,
+                                                    Register dest) {
+  int32_t shift = Imm32::ShiftOf(address.scale).value;
+  if (shift) {
+    ma_sll(ScratchRegister, address.index, Imm32(shift));
+    as_addu(dest, address.base, ScratchRegister);
+  } else {
+    as_addu(dest, address.base, address.index);
+  }
+}
+
+// Shortcut for when we know we're transferring 32 bits of data.
+void MacroAssemblerMIPS::ma_lw(Register data, Address address) {
+  ma_load(data, address, SizeWord);
+}
+
+void MacroAssemblerMIPS::ma_sw(Register data, Address address) {
+  ma_store(data, address, SizeWord);
+}
+
+void MacroAssemblerMIPS::ma_sw(Imm32 imm, Address address) {
+  MOZ_ASSERT(address.base != ScratchRegister);
+  ma_li(ScratchRegister, imm);
+
+  if (Imm16::IsInSignedRange(address.offset)) {
+    as_sw(ScratchRegister, address.base, address.offset);
+  } else {
+    MOZ_ASSERT(address.base != SecondScratchReg);
+
+    ma_li(SecondScratchReg, Imm32(address.offset));
+    as_addu(SecondScratchReg, address.base, SecondScratchReg);
+    as_sw(ScratchRegister, SecondScratchReg, 0);
+  }
+}
+
+void MacroAssemblerMIPS::ma_sw(Register data, BaseIndex& address) {
+  ma_store(data, address, SizeWord);
+}
+
+void MacroAssemblerMIPS::ma_pop(Register r) {
+  as_lw(r, StackPointer, 0);
+  as_addiu(StackPointer, StackPointer, sizeof(intptr_t));
+}
+
+void MacroAssemblerMIPS::ma_push(Register r) {
+  if (r == sp) {
+    // Pushing sp requires one more instruction.
+    ma_move(ScratchRegister, sp);
+    r = ScratchRegister;
+  }
+
+  as_addiu(StackPointer, StackPointer, -sizeof(intptr_t));
+  as_sw(r, StackPointer, 0);
+}
+
+// Branches when done from within mips-specific code.
+void MacroAssemblerMIPS::ma_b(Register lhs, Address addr, Label* label,
+                              Condition c, JumpKind jumpKind) {
+  MOZ_ASSERT(lhs != ScratchRegister);
+  ma_lw(ScratchRegister, addr);
+  ma_b(lhs, ScratchRegister, label, c, jumpKind);
+}
+
+void MacroAssemblerMIPS::ma_b(Address addr, Imm32 imm, Label* label,
+                              Condition c, JumpKind jumpKind) {
+  ma_lw(SecondScratchReg, addr);
+  ma_b(SecondScratchReg, imm, label, c, jumpKind);
+}
+
+void MacroAssemblerMIPS::ma_b(Address addr, ImmGCPtr imm, Label* label,
+                              Condition c, JumpKind jumpKind) {
+  ma_lw(SecondScratchReg, addr);
+  ma_b(SecondScratchReg, imm, label, c, jumpKind);
+}
+
+void MacroAssemblerMIPS::ma_bal(Label* label, DelaySlotFill delaySlotFill) {
+  spew("branch .Llabel %p\n", label);
+  if (label->bound()) {
+    // Generate the long jump for calls because return address has to be
+    // the address after the reserved block.
+    addLongJump(nextOffset(), BufferOffset(label->offset()));
+    ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET));
+    as_jalr(ScratchRegister);
+    if (delaySlotFill == FillDelaySlot) {
+      as_nop();
+    }
+    return;
+  }
+
+  // Second word holds a pointer to the next branch in label's chain.
+  uint32_t nextInChain =
+      label->used() ? label->offset() : LabelBase::INVALID_OFFSET;
+
+  // Make the whole branch continous in the buffer.
+  m_buffer.ensureSpace(4 * sizeof(uint32_t));
+
+  spew("bal .Llabel %p\n", label);
+  BufferOffset bo = writeInst(getBranchCode(BranchIsCall).encode());
+  writeInst(nextInChain);
+  if (!oom()) {
+    label->use(bo.getOffset());
+  }
+  // Leave space for long jump.
+  as_nop();
+  if (delaySlotFill == FillDelaySlot) {
+    as_nop();
+  }
+}
+
+void MacroAssemblerMIPS::branchWithCode(InstImm code, Label* label,
+                                        JumpKind jumpKind) {
+  spew("branch .Llabel %p", label);
+  MOZ_ASSERT(code.encode() !=
+             InstImm(op_regimm, zero, rt_bgezal, BOffImm16(0)).encode());
+  InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0));
+
+  if (label->bound()) {
+    int32_t offset = label->offset() - m_buffer.nextOffset().getOffset();
+
+    if (BOffImm16::IsInRange(offset)) {
+      jumpKind = ShortJump;
+    }
+
+    if (jumpKind == ShortJump) {
+      MOZ_ASSERT(BOffImm16::IsInRange(offset));
+      code.setBOffImm16(BOffImm16(offset));
+#ifdef JS_JITSPEW
+      decodeBranchInstAndSpew(code);
+#endif
+      writeInst(code.encode());
+      as_nop();
+      return;
+    }
+
+    if (code.encode() == inst_beq.encode()) {
+      // Handle long jump
+      addLongJump(nextOffset(), BufferOffset(label->offset()));
+      ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET));
+      as_jr(ScratchRegister);
+      as_nop();
+      return;
+    }
+
+    // Handle long conditional branch
+    spew("invert branch .Llabel %p", label);
+    InstImm code_r = invertBranch(code, BOffImm16(5 * sizeof(uint32_t)));
+#ifdef JS_JITSPEW
+    decodeBranchInstAndSpew(code_r);
+#endif
+    writeInst(code_r.encode());
+
+    // No need for a "nop" here because we can clobber scratch.
+    addLongJump(nextOffset(), BufferOffset(label->offset()));
+    ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET));
+    as_jr(ScratchRegister);
+    as_nop();
+    return;
+  }
+
+  // Generate open jump and link it to a label.
+
+  // Second word holds a pointer to the next branch in label's chain.
+  uint32_t nextInChain =
+      label->used() ? label->offset() : LabelBase::INVALID_OFFSET;
+
+  if (jumpKind == ShortJump) {
+    // Make the whole branch continous in the buffer.
+    m_buffer.ensureSpace(2 * sizeof(uint32_t));
+
+    // Indicate that this is short jump with offset 4.
+    code.setBOffImm16(BOffImm16(4));
+#ifdef JS_JITSPEW
+    decodeBranchInstAndSpew(code);
+#endif
+    BufferOffset bo = writeInst(code.encode());
+    writeInst(nextInChain);
+    if (!oom()) {
+      label->use(bo.getOffset());
+    }
+    return;
+  }
+
+  bool conditional = code.encode() != inst_beq.encode();
+
+  // Make the whole branch continous in the buffer.
+  m_buffer.ensureSpace((conditional ? 5 : 4) * sizeof(uint32_t));
+
+#ifdef JS_JITSPEW
+  decodeBranchInstAndSpew(code);
+#endif
+  BufferOffset bo = writeInst(code.encode());
+  writeInst(nextInChain);
+  if (!oom()) {
+    label->use(bo.getOffset());
+  }
+  // Leave space for potential long jump.
+  as_nop();
+  as_nop();
+  if (conditional) {
+    as_nop();
+  }
+}
+
+void MacroAssemblerMIPSCompat::cmp64Set(Condition cond, Register64 lhs,
+                                        Imm64 val, Register dest) {
+  if (val.value == 0) {
+    switch (cond) {
+      case Assembler::Equal:
+      case Assembler::BelowOrEqual:
+        as_or(dest, lhs.high, lhs.low);
+        as_sltiu(dest, dest, 1);
+        break;
+      case Assembler::NotEqual:
+      case Assembler::Above:
+        as_or(dest, lhs.high, lhs.low);
+        as_sltu(dest, zero, dest);
+        break;
+      case Assembler::LessThan:
+      case Assembler::GreaterThanOrEqual:
+        as_slt(dest, lhs.high, zero);
+        if (cond == Assembler::GreaterThanOrEqual) {
+          as_xori(dest, dest, 1);
+        }
+        break;
+      case Assembler::GreaterThan:
+      case Assembler::LessThanOrEqual:
+        as_or(SecondScratchReg, lhs.high, lhs.low);
+        as_sra(ScratchRegister, lhs.high, 31);
+        as_sltu(dest, ScratchRegister, SecondScratchReg);
+        if (cond == Assembler::LessThanOrEqual) {
+          as_xori(dest, dest, 1);
+        }
+        break;
+      case Assembler::Below:
+      case Assembler::AboveOrEqual:
+        as_ori(dest, zero, cond == Assembler::AboveOrEqual ? 1 : 0);
+        break;
+      default:
+        MOZ_CRASH("Condition code not supported");
+        break;
+    }
+    return;
+  }
+
+  Condition c = ma_cmp64(cond, lhs, val, dest);
+
+  switch (cond) {
+    // For Equal/NotEqual cond ma_cmp64 dest holds non boolean result.
+    case Assembler::Equal:
+      as_sltiu(dest, dest, 1);
+      break;
+    case Assembler::NotEqual:
+      as_sltu(dest, zero, dest);
+      break;
+    default:
+      if (c == Assembler::Zero) as_xori(dest, dest, 1);
+      break;
+  }
+}
+
+void MacroAssemblerMIPSCompat::cmp64Set(Condition cond, Register64 lhs,
+                                        Register64 rhs, Register dest) {
+  Condition c = ma_cmp64(cond, lhs, rhs, dest);
+
+  switch (cond) {
+    // For Equal/NotEqual cond ma_cmp64 dest holds non boolean result.
+    case Assembler::Equal:
+      as_sltiu(dest, dest, 1);
+      break;
+    case Assembler::NotEqual:
+      as_sltu(dest, zero, dest);
+      break;
+    default:
+      if (c == Assembler::Zero) as_xori(dest, dest, 1);
+      break;
+  }
+}
+
+Assembler::Condition MacroAssemblerMIPSCompat::ma_cmp64(Condition cond,
+                                                        Register64 lhs,
+                                                        Register64 rhs,
+                                                        Register dest) {
+  switch (cond) {
+    case Assembler::Equal:
+    case Assembler::NotEqual:
+      as_xor(SecondScratchReg, lhs.high, rhs.high);
+      as_xor(ScratchRegister, lhs.low, rhs.low);
+      as_or(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::Equal) ? Assembler::Zero : Assembler::NonZero;
+      break;
+    case Assembler::LessThan:
+    case Assembler::GreaterThanOrEqual:
+      as_slt(SecondScratchReg, rhs.high, lhs.high);
+      as_sltu(ScratchRegister, lhs.low, rhs.low);
+      as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      as_slt(ScratchRegister, lhs.high, rhs.high);
+      as_or(dest, ScratchRegister, SecondScratchReg);
+      return (cond == Assembler::GreaterThanOrEqual) ? Assembler::Zero
+                                                     : Assembler::NonZero;
+      break;
+    case Assembler::GreaterThan:
+    case Assembler::LessThanOrEqual:
+      as_slt(SecondScratchReg, lhs.high, rhs.high);
+      as_sltu(ScratchRegister, rhs.low, lhs.low);
+      as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      as_slt(ScratchRegister, rhs.high, lhs.high);
+      as_or(dest, ScratchRegister, SecondScratchReg);
+      return (cond == Assembler::LessThanOrEqual) ? Assembler::Zero
+                                                  : Assembler::NonZero;
+      break;
+    case Assembler::Below:
+    case Assembler::AboveOrEqual:
+      as_sltu(SecondScratchReg, rhs.high, lhs.high);
+      as_sltu(ScratchRegister, lhs.low, rhs.low);
+      as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      as_sltu(ScratchRegister, lhs.high, rhs.high);
+      as_or(dest, ScratchRegister, SecondScratchReg);
+      return (cond == Assembler::AboveOrEqual) ? Assembler::Zero
+                                               : Assembler::NonZero;
+      break;
+    case Assembler::Above:
+    case Assembler::BelowOrEqual:
+      as_sltu(SecondScratchReg, lhs.high, rhs.high);
+      as_sltu(ScratchRegister, rhs.low, lhs.low);
+      as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      as_sltu(ScratchRegister, rhs.high, lhs.high);
+      as_or(dest, ScratchRegister, SecondScratchReg);
+      return (cond == Assembler::BelowOrEqual) ? Assembler::Zero
+                                               : Assembler::NonZero;
+      break;
+    default:
+      MOZ_CRASH("Condition code not supported");
+      break;
+  }
+}
+
+Assembler::Condition MacroAssemblerMIPSCompat::ma_cmp64(Condition cond,
+                                                        Register64 lhs,
+                                                        Imm64 val,
+                                                        Register dest) {
+  MOZ_ASSERT(val.value != 0);
+
+  switch (cond) {
+    case Assembler::Equal:
+    case Assembler::NotEqual:
+      ma_xor(SecondScratchReg, lhs.high, val.hi());
+      ma_xor(ScratchRegister, lhs.low, val.low());
+      as_or(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::Equal) ? Assembler::Zero : Assembler::NonZero;
+      break;
+    case Assembler::LessThan:
+    case Assembler::GreaterThanOrEqual:
+      ma_li(SecondScratchReg, val.hi());
+      as_slt(ScratchRegister, lhs.high, SecondScratchReg);
+      as_slt(SecondScratchReg, SecondScratchReg, lhs.high);
+      as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      ma_li(ScratchRegister, val.low());
+      as_sltu(ScratchRegister, lhs.low, ScratchRegister);
+      as_slt(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::GreaterThanOrEqual) ? Assembler::Zero
+                                                     : Assembler::NonZero;
+      break;
+    case Assembler::GreaterThan:
+    case Assembler::LessThanOrEqual:
+      ma_li(SecondScratchReg, val.hi());
+      as_slt(ScratchRegister, SecondScratchReg, lhs.high);
+      as_slt(SecondScratchReg, lhs.high, SecondScratchReg);
+      as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      ma_li(ScratchRegister, val.low());
+      as_sltu(ScratchRegister, ScratchRegister, lhs.low);
+      as_slt(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::LessThanOrEqual) ? Assembler::Zero
+                                                  : Assembler::NonZero;
+      break;
+    case Assembler::Below:
+    case Assembler::AboveOrEqual:
+      ma_li(SecondScratchReg, val.hi());
+      as_sltu(ScratchRegister, lhs.high, SecondScratchReg);
+      as_sltu(SecondScratchReg, SecondScratchReg, lhs.high);
+      as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      ma_li(ScratchRegister, val.low());
+      as_sltu(ScratchRegister, lhs.low, ScratchRegister);
+      as_slt(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::AboveOrEqual) ? Assembler::Zero
+                                               : Assembler::NonZero;
+      break;
+    case Assembler::Above:
+    case Assembler::BelowOrEqual:
+      ma_li(SecondScratchReg, val.hi());
+      as_sltu(ScratchRegister, SecondScratchReg, lhs.high);
+      as_sltu(SecondScratchReg, lhs.high, SecondScratchReg);
+      as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister);
+      ma_li(ScratchRegister, val.low());
+      as_sltu(ScratchRegister, ScratchRegister, lhs.low);
+      as_slt(dest, SecondScratchReg, ScratchRegister);
+      return (cond == Assembler::BelowOrEqual) ? Assembler::Zero
+                                               : Assembler::NonZero;
+      break;
+    default:
+      MOZ_CRASH("Condition code not supported");
+      break;
+  }
+}
+
+// fp instructions
+void MacroAssemblerMIPS::ma_lid(FloatRegister dest, double value) {
+  struct DoubleStruct {
+    uint32_t lo;
+    uint32_t hi;
+  };
+  DoubleStruct intStruct = mozilla::BitwiseCast<DoubleStruct>(value);
+#if MOZ_BIG_ENDIAN()
+  std::swap(intStruct.hi, intStruct.lo);
+#endif
+
+  // put hi part of 64 bit value into the odd register
+  if (intStruct.hi == 0) {
+    moveToDoubleHi(zero, dest);
+  } else {
+    ma_li(ScratchRegister, Imm32(intStruct.hi));
+    moveToDoubleHi(ScratchRegister, dest);
+  }
+
+  // put low part of 64 bit value into the even register
+  if (intStruct.lo == 0) {
+    moveToDoubleLo(zero, dest);
+  } else {
+    ma_li(ScratchRegister, Imm32(intStruct.lo));
+    moveToDoubleLo(ScratchRegister, dest);
+  }
+}
+
+void MacroAssemblerMIPS::ma_mv(FloatRegister src, ValueOperand dest) {
+  moveFromDoubleLo(src, dest.payloadReg());
+  moveFromDoubleHi(src, dest.typeReg());
+}
+
+void MacroAssemblerMIPS::ma_mv(ValueOperand src, FloatRegister dest) {
+  moveToDoubleLo(src.payloadReg(), dest);
+  moveToDoubleHi(src.typeReg(), dest);
+}
+
+void MacroAssemblerMIPS::ma_ls(FloatRegister ft, Address address) {
+  if (Imm16::IsInSignedRange(address.offset)) {
+    as_lwc1(ft, address.base, address.offset);
+  } else {
+    MOZ_ASSERT(address.base != ScratchRegister);
+    ma_li(ScratchRegister, Imm32(address.offset));
+    if (isLoongson()) {
+      as_gslsx(ft, address.base, ScratchRegister, 0);
+    } else {
+      as_addu(ScratchRegister, address.base, ScratchRegister);
+      as_lwc1(ft, ScratchRegister, 0);
+    }
+  }
+}
+
+void MacroAssemblerMIPS::ma_ld(FloatRegister ft, Address address) {
+  if (Imm16::IsInSignedRange(address.offset)) {
+    as_ldc1(ft, address.base, address.offset);
+  } else {
+    MOZ_ASSERT(address.base != ScratchRegister);
+    ma_li(ScratchRegister, Imm32(address.offset));
+    if (isLoongson()) {
+      as_gsldx(ft, address.base, ScratchRegister, 0);
+    } else {
+      as_addu(ScratchRegister, address.base, ScratchRegister);
+      as_ldc1(ft, ScratchRegister, 0);
+    }
+  }
+}
+
+void MacroAssemblerMIPS::ma_sd(FloatRegister ft, Address address) {
+  if (Imm16::IsInSignedRange(address.offset)) {
+    as_sdc1(ft, address.base, address.offset);
+  } else {
+    MOZ_ASSERT(address.base != ScratchRegister);
+    ma_li(ScratchRegister, Imm32(address.offset));
+    if (isLoongson()) {
+      as_gssdx(ft, address.base, ScratchRegister, 0);
+    } else {
+      as_addu(ScratchRegister, address.base, ScratchRegister);
+      as_sdc1(ft, ScratchRegister, 0);
+    }
+  }
+}
+
+void MacroAssemblerMIPS::ma_ss(FloatRegister ft, Address address) {
+  if (Imm16::IsInSignedRange(address.offset)) {
+    as_swc1(ft, address.base, address.offset);
+  } else {
+    MOZ_ASSERT(address.base != ScratchRegister);
+    ma_li(ScratchRegister, Imm32(address.offset));
+    if (isLoongson()) {
+      as_gsssx(ft, address.base, ScratchRegister, 0);
+    } else {
+      as_addu(ScratchRegister, address.base, ScratchRegister);
+      as_swc1(ft, ScratchRegister, 0);
+    }
+  }
+}
+
+void MacroAssemblerMIPS::ma_ldc1WordAligned(FloatRegister ft, Register base,
+                                            int32_t off) {
+  MOZ_ASSERT(Imm16::IsInSignedRange(off + PAYLOAD_OFFSET) &&
+             Imm16::IsInSignedRange(off + TAG_OFFSET));
+
+  as_lwc1(ft, base, off + PAYLOAD_OFFSET);
+  as_lwc1(getOddPair(ft), base, off + TAG_OFFSET);
+}
+
+void MacroAssemblerMIPS::ma_sdc1WordAligned(FloatRegister ft, Register base,
+                                            int32_t off) {
+  MOZ_ASSERT(Imm16::IsInSignedRange(off + PAYLOAD_OFFSET) &&
+             Imm16::IsInSignedRange(off + TAG_OFFSET));
+
+  as_swc1(ft, base, off + PAYLOAD_OFFSET);
+  as_swc1(getOddPair(ft), base, off + TAG_OFFSET);
+}
+
+void MacroAssemblerMIPS::ma_pop(FloatRegister f) {
+  if (f.isDouble()) {
+    ma_ldc1WordAligned(f, StackPointer, 0);
+  } else {
+    as_lwc1(f, StackPointer, 0);
+  }
+
+  as_addiu(StackPointer, StackPointer, f.size());
+}
+
+void MacroAssemblerMIPS::ma_push(FloatRegister f) {
+  as_addiu(StackPointer, StackPointer, -f.size());
+
+  if (f.isDouble()) {
+    ma_sdc1WordAligned(f, StackPointer, 0);
+  } else {
+    as_swc1(f, StackPointer, 0);
+  }
+}
+
+bool MacroAssemblerMIPSCompat::buildOOLFakeExitFrame(void* fakeReturnAddr) {
+  uint32_t descriptor = MakeFrameDescriptor(
+      asMasm().framePushed(), FrameType::IonJS, ExitFrameLayout::Size());
+
+  asMasm().Push(Imm32(descriptor));  // descriptor_
+  asMasm().Push(ImmPtr(fakeReturnAddr));
+
+  return true;
+}
+
+void MacroAssemblerMIPSCompat::move32(Imm32 imm, Register dest) {
+  ma_li(dest, imm);
+}
+
+void MacroAssemblerMIPSCompat::move32(Register src, Register dest) {
+  ma_move(dest, src);
+}
+
+void MacroAssemblerMIPSCompat::movePtr(Register src, Register dest) {
+  ma_move(dest, src);
+}
+void MacroAssemblerMIPSCompat::movePtr(ImmWord imm, Register dest) {
+  ma_li(dest, imm);
+}
+
+void MacroAssemblerMIPSCompat::movePtr(ImmGCPtr imm, Register dest) {
+  ma_li(dest, imm);
+}
+
+void MacroAssemblerMIPSCompat::movePtr(ImmPtr imm, Register dest) {
+  movePtr(ImmWord(uintptr_t(imm.value)), dest);
+}
+void MacroAssemblerMIPSCompat::movePtr(wasm::SymbolicAddress imm,
+                                       Register dest) {
+  append(wasm::SymbolicAccess(CodeOffset(nextOffset().getOffset()), imm));
+  ma_liPatchable(dest, ImmWord(-1));
+}
+
+void MacroAssemblerMIPSCompat::load8ZeroExtend(const Address& address,
+                                               Register dest) {
+  ma_load(dest, address, SizeByte, ZeroExtend);
+}
+
+void MacroAssemblerMIPSCompat::load8ZeroExtend(const BaseIndex& src,
+                                               Register dest) {
+  ma_load(dest, src, SizeByte, ZeroExtend);
+}
+
+void MacroAssemblerMIPSCompat::load8SignExtend(const Address& address,
+                                               Register dest) {
+  ma_load(dest, address, SizeByte, SignExtend);
+}
+
+void MacroAssemblerMIPSCompat::load8SignExtend(const BaseIndex& src,
+                                               Register dest) {
+  ma_load(dest, src, SizeByte, SignExtend);
+}
+
+void MacroAssemblerMIPSCompat::load16ZeroExtend(const Address& address,
+                                                Register dest) {
+  ma_load(dest, address, SizeHalfWord, ZeroExtend);
+}
+
+void MacroAssemblerMIPSCompat::load16ZeroExtend(const BaseIndex& src,
+                                                Register dest) {
+  ma_load(dest, src, SizeHalfWord, ZeroExtend);
+}
+
+void MacroAssemblerMIPSCompat::load16SignExtend(const Address& address,
+                                                Register dest) {
+  ma_load(dest, address, SizeHalfWord, SignExtend);
+}
+
+void MacroAssemblerMIPSCompat::load16SignExtend(const BaseIndex& src,
+                                                Register dest) {
+  ma_load(dest, src, SizeHalfWord, SignExtend);
+}
+
+void MacroAssemblerMIPSCompat::load32(const Address& address, Register dest) {
+  ma_load(dest, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::load32(const BaseIndex& address, Register dest) {
+  ma_load(dest, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::load32(AbsoluteAddress address, Register dest) {
+  movePtr(ImmPtr(address.addr), ScratchRegister);
+  load32(Address(ScratchRegister, 0), dest);
+}
+
+void MacroAssemblerMIPSCompat::load32(wasm::SymbolicAddress address,
+                                      Register dest) {
+  movePtr(address, ScratchRegister);
+  load32(Address(ScratchRegister, 0), dest);
+}
+
+void MacroAssemblerMIPSCompat::loadPtr(const Address& address, Register dest) {
+  ma_load(dest, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::loadPtr(const BaseIndex& src, Register dest) {
+  ma_load(dest, src, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::loadPtr(AbsoluteAddress address, Register dest) {
+  movePtr(ImmPtr(address.addr), ScratchRegister);
+  loadPtr(Address(ScratchRegister, 0), dest);
+}
+
+void MacroAssemblerMIPSCompat::loadPtr(wasm::SymbolicAddress address,
+                                       Register dest) {
+  movePtr(address, ScratchRegister);
+  loadPtr(Address(ScratchRegister, 0), dest);
+}
+
+void MacroAssemblerMIPSCompat::loadPrivate(const Address& address,
+                                           Register dest) {
+  ma_lw(dest, Address(address.base, address.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::loadUnalignedDouble(
+    const wasm::MemoryAccessDesc& access, const BaseIndex& src, Register temp,
+    FloatRegister dest) {
+  MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian.");
+  computeScaledAddress(src, SecondScratchReg);
+
+  BufferOffset load;
+  if (Imm16::IsInSignedRange(src.offset) &&
+      Imm16::IsInSignedRange(src.offset + 7)) {
+    load = as_lwl(temp, SecondScratchReg, src.offset + INT64LOW_OFFSET + 3);
+    as_lwr(temp, SecondScratchReg, src.offset + INT64LOW_OFFSET);
+    append(access, load.getOffset());
+    moveToDoubleLo(temp, dest);
+    load = as_lwl(temp, SecondScratchReg, src.offset + INT64HIGH_OFFSET + 3);
+    as_lwr(temp, SecondScratchReg, src.offset + INT64HIGH_OFFSET);
+    append(access, load.getOffset());
+    moveToDoubleHi(temp, dest);
+  } else {
+    ma_li(ScratchRegister, Imm32(src.offset));
+    as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister);
+    load = as_lwl(temp, ScratchRegister, INT64LOW_OFFSET + 3);
+    as_lwr(temp, ScratchRegister, INT64LOW_OFFSET);
+    append(access, load.getOffset());
+    moveToDoubleLo(temp, dest);
+    load = as_lwl(temp, ScratchRegister, INT64HIGH_OFFSET + 3);
+    as_lwr(temp, ScratchRegister, INT64HIGH_OFFSET);
+    append(access, load.getOffset());
+    moveToDoubleHi(temp, dest);
+  }
+}
+
+void MacroAssemblerMIPSCompat::loadUnalignedFloat32(
+    const wasm::MemoryAccessDesc& access, const BaseIndex& src, Register temp,
+    FloatRegister dest) {
+  MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian.");
+  computeScaledAddress(src, SecondScratchReg);
+  BufferOffset load;
+  if (Imm16::IsInSignedRange(src.offset) &&
+      Imm16::IsInSignedRange(src.offset + 3)) {
+    load = as_lwl(temp, SecondScratchReg, src.offset + 3);
+    as_lwr(temp, SecondScratchReg, src.offset);
+  } else {
+    ma_li(ScratchRegister, Imm32(src.offset));
+    as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister);
+    load = as_lwl(temp, ScratchRegister, 3);
+    as_lwr(temp, ScratchRegister, 0);
+  }
+  append(access, load.getOffset());
+  moveToFloat32(temp, dest);
+}
+
+void MacroAssemblerMIPSCompat::store8(Imm32 imm, const Address& address) {
+  ma_li(SecondScratchReg, imm);
+  ma_store(SecondScratchReg, address, SizeByte);
+}
+
+void MacroAssemblerMIPSCompat::store8(Register src, const Address& address) {
+  ma_store(src, address, SizeByte);
+}
+
+void MacroAssemblerMIPSCompat::store8(Imm32 imm, const BaseIndex& dest) {
+  ma_store(imm, dest, SizeByte);
+}
+
+void MacroAssemblerMIPSCompat::store8(Register src, const BaseIndex& dest) {
+  ma_store(src, dest, SizeByte);
+}
+
+void MacroAssemblerMIPSCompat::store16(Imm32 imm, const Address& address) {
+  ma_li(SecondScratchReg, imm);
+  ma_store(SecondScratchReg, address, SizeHalfWord);
+}
+
+void MacroAssemblerMIPSCompat::store16(Register src, const Address& address) {
+  ma_store(src, address, SizeHalfWord);
+}
+
+void MacroAssemblerMIPSCompat::store16(Imm32 imm, const BaseIndex& dest) {
+  ma_store(imm, dest, SizeHalfWord);
+}
+
+void MacroAssemblerMIPSCompat::store16(Register src, const BaseIndex& address) {
+  ma_store(src, address, SizeHalfWord);
+}
+
+void MacroAssemblerMIPSCompat::store32(Register src, AbsoluteAddress address) {
+  movePtr(ImmPtr(address.addr), ScratchRegister);
+  store32(src, Address(ScratchRegister, 0));
+}
+
+void MacroAssemblerMIPSCompat::store32(Register src, const Address& address) {
+  ma_store(src, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::store32(Imm32 src, const Address& address) {
+  move32(src, SecondScratchReg);
+  ma_store(SecondScratchReg, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::store32(Imm32 imm, const BaseIndex& dest) {
+  ma_store(imm, dest, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::store32(Register src, const BaseIndex& dest) {
+  ma_store(src, dest, SizeWord);
+}
+
+template <typename T>
+void MacroAssemblerMIPSCompat::storePtr(ImmWord imm, T address) {
+  ma_li(SecondScratchReg, imm);
+  ma_store(SecondScratchReg, address, SizeWord);
+}
+
+template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmWord imm,
+                                                          Address address);
+template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmWord imm,
+                                                            BaseIndex address);
+
+template <typename T>
+void MacroAssemblerMIPSCompat::storePtr(ImmPtr imm, T address) {
+  storePtr(ImmWord(uintptr_t(imm.value)), address);
+}
+
+template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmPtr imm,
+                                                          Address address);
+template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmPtr imm,
+                                                            BaseIndex address);
+
+template <typename T>
+void MacroAssemblerMIPSCompat::storePtr(ImmGCPtr imm, T address) {
+  movePtr(imm, SecondScratchReg);
+  storePtr(SecondScratchReg, address);
+}
+
+template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmGCPtr imm,
+                                                          Address address);
+template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmGCPtr imm,
+                                                            BaseIndex address);
+
+void MacroAssemblerMIPSCompat::storePtr(Register src, const Address& address) {
+  ma_store(src, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::storePtr(Register src,
+                                        const BaseIndex& address) {
+  ma_store(src, address, SizeWord);
+}
+
+void MacroAssemblerMIPSCompat::storePtr(Register src, AbsoluteAddress dest) {
+  movePtr(ImmPtr(dest.addr), ScratchRegister);
+  storePtr(src, Address(ScratchRegister, 0));
+}
+
+void MacroAssemblerMIPSCompat::storeUnalignedFloat32(
+    const wasm::MemoryAccessDesc& access, FloatRegister src, Register temp,
+    const BaseIndex& dest) {
+  MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian.");
+  computeScaledAddress(dest, SecondScratchReg);
+  moveFromFloat32(src, temp);
+
+  BufferOffset store;
+  if (Imm16::IsInSignedRange(dest.offset) &&
+      Imm16::IsInSignedRange(dest.offset + 3)) {
+    store = as_swl(temp, SecondScratchReg, dest.offset + 3);
+    as_swr(temp, SecondScratchReg, dest.offset);
+  } else {
+    ma_li(ScratchRegister, Imm32(dest.offset));
+    as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister);
+    store = as_swl(temp, ScratchRegister, 3);
+    as_swr(temp, ScratchRegister, 0);
+  }
+  append(access, store.getOffset());
+}
+
+void MacroAssemblerMIPSCompat::storeUnalignedDouble(
+    const wasm::MemoryAccessDesc& access, FloatRegister src, Register temp,
+    const BaseIndex& dest) {
+  MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian.");
+  computeScaledAddress(dest, SecondScratchReg);
+
+  BufferOffset store;
+  if (Imm16::IsInSignedRange(dest.offset) &&
+      Imm16::IsInSignedRange(dest.offset + 7)) {
+    moveFromDoubleHi(src, temp);
+    store = as_swl(temp, SecondScratchReg, dest.offset + INT64HIGH_OFFSET + 3);
+    as_swr(temp, SecondScratchReg, dest.offset + INT64HIGH_OFFSET);
+    moveFromDoubleLo(src, temp);
+    as_swl(temp, SecondScratchReg, dest.offset + INT64LOW_OFFSET + 3);
+    as_swr(temp, SecondScratchReg, dest.offset + INT64LOW_OFFSET);
+
+  } else {
+    ma_li(ScratchRegister, Imm32(dest.offset));
+    as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister);
+    moveFromDoubleHi(src, temp);
+    store = as_swl(temp, ScratchRegister, INT64HIGH_OFFSET + 3);
+    as_swr(temp, ScratchRegister, INT64HIGH_OFFSET);
+    moveFromDoubleLo(src, temp);
+    as_swl(temp, ScratchRegister, INT64LOW_OFFSET + 3);
+    as_swr(temp, ScratchRegister, INT64LOW_OFFSET);
+  }
+  append(access, store.getOffset());
+}
+
+void MacroAssembler::clampDoubleToUint8(FloatRegister input, Register output) {
+  as_roundwd(ScratchDoubleReg, input);
+  ma_li(ScratchRegister, Imm32(255));
+  as_mfc1(output, ScratchDoubleReg);
+  zeroDouble(ScratchDoubleReg);
+  as_sltiu(SecondScratchReg, output, 255);
+  as_colt(DoubleFloat, ScratchDoubleReg, input);
+  // if res > 255; res = 255;
+  as_movz(output, ScratchRegister, SecondScratchReg);
+  // if !(input > 0); res = 0;
+  as_movf(output, zero);
+}
+
+// higher level tag testing code
+Operand MacroAssemblerMIPSCompat::ToPayload(Operand base) {
+  return Operand(Register::FromCode(base.base()), base.disp() + PAYLOAD_OFFSET);
+}
+
+Operand MacroAssemblerMIPSCompat::ToType(Operand base) {
+  return Operand(Register::FromCode(base.base()), base.disp() + TAG_OFFSET);
+}
+
+void MacroAssemblerMIPSCompat::testNullSet(Condition cond,
+                                           const ValueOperand& value,
+                                           Register dest) {
+  MOZ_ASSERT(cond == Equal || cond == NotEqual);
+  ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_NULL), cond);
+}
+
+void MacroAssemblerMIPSCompat::testObjectSet(Condition cond,
+                                             const ValueOperand& value,
+                                             Register dest) {
+  MOZ_ASSERT(cond == Equal || cond == NotEqual);
+  ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_OBJECT), cond);
+}
+
+void MacroAssemblerMIPSCompat::testUndefinedSet(Condition cond,
+                                                const ValueOperand& value,
+                                                Register dest) {
+  MOZ_ASSERT(cond == Equal || cond == NotEqual);
+  ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_UNDEFINED), cond);
+}
+
+// unboxing code
+void MacroAssemblerMIPSCompat::unboxNonDouble(const ValueOperand& operand,
+                                              Register dest, JSValueType) {
+  if (operand.payloadReg() != dest) {
+    ma_move(dest, operand.payloadReg());
+  }
+}
+
+void MacroAssemblerMIPSCompat::unboxNonDouble(const Address& src, Register dest,
+                                              JSValueType) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxNonDouble(const BaseIndex& src,
+                                              Register dest, JSValueType) {
+  computeScaledAddress(src, SecondScratchReg);
+  ma_lw(dest, Address(SecondScratchReg, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxInt32(const ValueOperand& operand,
+                                          Register dest) {
+  ma_move(dest, operand.payloadReg());
+}
+
+void MacroAssemblerMIPSCompat::unboxInt32(const Address& src, Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxBoolean(const ValueOperand& operand,
+                                            Register dest) {
+  ma_move(dest, operand.payloadReg());
+}
+
+void MacroAssemblerMIPSCompat::unboxBoolean(const Address& src, Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxDouble(const ValueOperand& operand,
+                                           FloatRegister dest) {
+  moveToDoubleLo(operand.payloadReg(), dest);
+  moveToDoubleHi(operand.typeReg(), dest);
+}
+
+void MacroAssemblerMIPSCompat::unboxDouble(const Address& src,
+                                           FloatRegister dest) {
+  ma_lw(ScratchRegister, Address(src.base, src.offset + PAYLOAD_OFFSET));
+  moveToDoubleLo(ScratchRegister, dest);
+  ma_lw(ScratchRegister, Address(src.base, src.offset + TAG_OFFSET));
+  moveToDoubleHi(ScratchRegister, dest);
+}
+
+void MacroAssemblerMIPSCompat::unboxDouble(const BaseIndex& src,
+                                           FloatRegister dest) {
+  loadDouble(src, dest);
+}
+
+void MacroAssemblerMIPSCompat::unboxString(const ValueOperand& operand,
+                                           Register dest) {
+  ma_move(dest, operand.payloadReg());
+}
+
+void MacroAssemblerMIPSCompat::unboxString(const Address& src, Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxBigInt(const ValueOperand& operand,
+                                           Register dest) {
+  ma_move(dest, operand.payloadReg());
+}
+
+void MacroAssemblerMIPSCompat::unboxBigInt(const Address& src, Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxObject(const ValueOperand& src,
+                                           Register dest) {
+  ma_move(dest, src.payloadReg());
+}
+
+void MacroAssemblerMIPSCompat::unboxObject(const Address& src, Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxObjectOrNull(const Address& src,
+                                                 Register dest) {
+  ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::unboxValue(const ValueOperand& src,
+                                          AnyRegister dest, JSValueType) {
+  if (dest.isFloat()) {
+    Label notInt32, end;
+    asMasm().branchTestInt32(Assembler::NotEqual, src, &notInt32);
+    convertInt32ToDouble(src.payloadReg(), dest.fpu());
+    ma_b(&end, ShortJump);
+    bind(&notInt32);
+    unboxDouble(src, dest.fpu());
+    bind(&end);
+  } else if (src.payloadReg() != dest.gpr()) {
+    ma_move(dest.gpr(), src.payloadReg());
+  }
+}
+
+void MacroAssemblerMIPSCompat::boxDouble(FloatRegister src,
+                                         const ValueOperand& dest,
+                                         FloatRegister) {
+  moveFromDoubleLo(src, dest.payloadReg());
+  moveFromDoubleHi(src, dest.typeReg());
+}
+
+void MacroAssemblerMIPSCompat::boxNonDouble(JSValueType type, Register src,
+                                            const ValueOperand& dest) {
+  if (src != dest.payloadReg()) {
+    ma_move(dest.payloadReg(), src);
+  }
+  ma_li(dest.typeReg(), ImmType(type));
+}
+
+void MacroAssemblerMIPSCompat::boolValueToDouble(const ValueOperand& operand,
+                                                 FloatRegister dest) {
+  convertBoolToInt32(operand.payloadReg(), ScratchRegister);
+  convertInt32ToDouble(ScratchRegister, dest);
+}
+
+void MacroAssemblerMIPSCompat::int32ValueToDouble(const ValueOperand& operand,
+                                                  FloatRegister dest) {
+  convertInt32ToDouble(operand.payloadReg(), dest);
+}
+
+void MacroAssemblerMIPSCompat::boolValueToFloat32(const ValueOperand& operand,
+                                                  FloatRegister dest) {
+  convertBoolToInt32(operand.payloadReg(), ScratchRegister);
+  convertInt32ToFloat32(ScratchRegister, dest);
+}
+
+void MacroAssemblerMIPSCompat::int32ValueToFloat32(const ValueOperand& operand,
+                                                   FloatRegister dest) {
+  convertInt32ToFloat32(operand.payloadReg(), dest);
+}
+
+void MacroAssemblerMIPSCompat::loadConstantFloat32(float f,
+                                                   FloatRegister dest) {
+  ma_lis(dest, f);
+}
+
+void MacroAssemblerMIPSCompat::loadInt32OrDouble(const Address& src,
+                                                 FloatRegister dest) {
+  Label notInt32, end;
+  // If it's an int, convert it to double.
+  ma_lw(SecondScratchReg, Address(src.base, src.offset + TAG_OFFSET));
+  asMasm().branchTestInt32(Assembler::NotEqual, SecondScratchReg, &notInt32);
+  ma_lw(SecondScratchReg, Address(src.base, src.offset + PAYLOAD_OFFSET));
+  convertInt32ToDouble(SecondScratchReg, dest);
+  ma_b(&end, ShortJump);
+
+  // Not an int, just load as double.
+  bind(&notInt32);
+  ma_ld(dest, src);
+  bind(&end);
+}
+
+void MacroAssemblerMIPSCompat::loadInt32OrDouble(Register base, Register index,
+                                                 FloatRegister dest,
+                                                 int32_t shift) {
+  Label notInt32, end;
+
+  // If it's an int, convert it to double.
+
+  computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)),
+                       SecondScratchReg);
+  // Since we only have one scratch, we need to stomp over it with the tag.
+  load32(Address(SecondScratchReg, TAG_OFFSET), SecondScratchReg);
+  asMasm().branchTestInt32(Assembler::NotEqual, SecondScratchReg, &notInt32);
+
+  computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)),
+                       SecondScratchReg);
+  load32(Address(SecondScratchReg, PAYLOAD_OFFSET), SecondScratchReg);
+  convertInt32ToDouble(SecondScratchReg, dest);
+  ma_b(&end, ShortJump);
+
+  // Not an int, just load as double.
+  bind(&notInt32);
+  // First, recompute the offset that had been stored in the scratch register
+  // since the scratch register was overwritten loading in the type.
+  computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)),
+                       SecondScratchReg);
+  loadDouble(Address(SecondScratchReg, 0), dest);
+  bind(&end);
+}
+
+void MacroAssemblerMIPSCompat::loadConstantDouble(double dp,
+                                                  FloatRegister dest) {
+  ma_lid(dest, dp);
+}
+
+Register MacroAssemblerMIPSCompat::extractObject(const Address& address,
+                                                 Register scratch) {
+  ma_lw(scratch, Address(address.base, address.offset + PAYLOAD_OFFSET));
+  return scratch;
+}
+
+Register MacroAssemblerMIPSCompat::extractTag(const Address& address,
+                                              Register scratch) {
+  ma_lw(scratch, Address(address.base, address.offset + TAG_OFFSET));
+  return scratch;
+}
+
+Register MacroAssemblerMIPSCompat::extractTag(const BaseIndex& address,
+                                              Register scratch) {
+  computeScaledAddress(address, scratch);
+  return extractTag(Address(scratch, address.offset), scratch);
+}
+
+uint32_t MacroAssemblerMIPSCompat::getType(const Value& val) {
+  return val.toNunboxTag();
+}
+
+void MacroAssemblerMIPSCompat::moveData(const Value& val, Register data) {
+  if (val.isGCThing()) {
+    ma_li(data, ImmGCPtr(val.toGCThing()));
+  } else {
+    ma_li(data, Imm32(val.toNunboxPayload()));
+  }
+}
+
+/////////////////////////////////////////////////////////////////
+// X86/X64-common/ARM/MIPS interface.
+/////////////////////////////////////////////////////////////////
+void MacroAssemblerMIPSCompat::storeValue(ValueOperand val, Operand dst) {
+  storeValue(val, Address(Register::FromCode(dst.base()), dst.disp()));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(ValueOperand val,
+                                          const BaseIndex& dest) {
+  computeScaledAddress(dest, SecondScratchReg);
+  storeValue(val, Address(SecondScratchReg, dest.offset));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(JSValueType type, Register reg,
+                                          BaseIndex dest) {
+  computeScaledAddress(dest, ScratchRegister);
+
+  // Make sure that ma_sw doesn't clobber ScratchRegister
+  int32_t offset = dest.offset;
+  if (!Imm16::IsInSignedRange(offset)) {
+    ma_li(SecondScratchReg, Imm32(offset));
+    as_addu(ScratchRegister, ScratchRegister, SecondScratchReg);
+    offset = 0;
+  }
+
+  storeValue(type, reg, Address(ScratchRegister, offset));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(ValueOperand val,
+                                          const Address& dest) {
+  ma_sw(val.payloadReg(), Address(dest.base, dest.offset + PAYLOAD_OFFSET));
+  ma_sw(val.typeReg(), Address(dest.base, dest.offset + TAG_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(JSValueType type, Register reg,
+                                          Address dest) {
+  MOZ_ASSERT(dest.base != SecondScratchReg);
+
+  ma_sw(reg, Address(dest.base, dest.offset + PAYLOAD_OFFSET));
+  ma_li(SecondScratchReg, ImmTag(JSVAL_TYPE_TO_TAG(type)));
+  ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(const Value& val, Address dest) {
+  MOZ_ASSERT(dest.base != SecondScratchReg);
+
+  ma_li(SecondScratchReg, Imm32(getType(val)));
+  ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET));
+  moveData(val, SecondScratchReg);
+  ma_sw(SecondScratchReg, Address(dest.base, dest.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::storeValue(const Value& val, BaseIndex dest) {
+  computeScaledAddress(dest, ScratchRegister);
+
+  // Make sure that ma_sw doesn't clobber ScratchRegister
+  int32_t offset = dest.offset;
+  if (!Imm16::IsInSignedRange(offset)) {
+    ma_li(SecondScratchReg, Imm32(offset));
+    as_addu(ScratchRegister, ScratchRegister, SecondScratchReg);
+    offset = 0;
+  }
+  storeValue(val, Address(ScratchRegister, offset));
+}
+
+void MacroAssemblerMIPSCompat::loadValue(const BaseIndex& addr,
+                                         ValueOperand val) {
+  computeScaledAddress(addr, SecondScratchReg);
+  loadValue(Address(SecondScratchReg, addr.offset), val);
+}
+
+void MacroAssemblerMIPSCompat::loadValue(Address src, ValueOperand val) {
+  // Ensure that loading the payload does not erase the pointer to the
+  // Value in memory.
+  if (src.base != val.payloadReg()) {
+    ma_lw(val.payloadReg(), Address(src.base, src.offset + PAYLOAD_OFFSET));
+    ma_lw(val.typeReg(), Address(src.base, src.offset + TAG_OFFSET));
+  } else {
+    ma_lw(val.typeReg(), Address(src.base, src.offset + TAG_OFFSET));
+    ma_lw(val.payloadReg(), Address(src.base, src.offset + PAYLOAD_OFFSET));
+  }
+}
+
+void MacroAssemblerMIPSCompat::tagValue(JSValueType type, Register payload,
+                                        ValueOperand dest) {
+  MOZ_ASSERT(dest.typeReg() != dest.payloadReg());
+  if (payload != dest.payloadReg()) {
+    ma_move(dest.payloadReg(), payload);
+  }
+  ma_li(dest.typeReg(), ImmType(type));
+}
+
+void MacroAssemblerMIPSCompat::pushValue(ValueOperand val) {
+  // Allocate stack slots for type and payload. One for each.
+  asMasm().subPtr(Imm32(sizeof(Value)), StackPointer);
+  // Store type and payload.
+  storeValue(val, Address(StackPointer, 0));
+}
+
+void MacroAssemblerMIPSCompat::pushValue(const Address& addr) {
+  // Allocate stack slots for type and payload. One for each.
+  ma_subu(StackPointer, StackPointer, Imm32(sizeof(Value)));
+  // If address is based on StackPointer its offset needs to be adjusted
+  // to accommodate for previous stack allocation.
+  int32_t offset =
+      addr.base != StackPointer ? addr.offset : addr.offset + sizeof(Value);
+  // Store type and payload.
+  ma_lw(ScratchRegister, Address(addr.base, offset + TAG_OFFSET));
+  ma_sw(ScratchRegister, Address(StackPointer, TAG_OFFSET));
+  ma_lw(ScratchRegister, Address(addr.base, offset + PAYLOAD_OFFSET));
+  ma_sw(ScratchRegister, Address(StackPointer, PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::popValue(ValueOperand val) {
+  // Load payload and type.
+  as_lw(val.payloadReg(), StackPointer, PAYLOAD_OFFSET);
+  as_lw(val.typeReg(), StackPointer, TAG_OFFSET);
+  // Free stack.
+  as_addiu(StackPointer, StackPointer, sizeof(Value));
+}
+
+void MacroAssemblerMIPSCompat::storePayload(const Value& val, Address dest) {
+  moveData(val, SecondScratchReg);
+  ma_sw(SecondScratchReg, Address(dest.base, dest.offset + PAYLOAD_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::storePayload(Register src, Address dest) {
+  ma_sw(src, Address(dest.base, dest.offset + PAYLOAD_OFFSET));
+  return;
+}
+
+void MacroAssemblerMIPSCompat::storePayload(const Value& val,
+                                            const BaseIndex& dest) {
+  MOZ_ASSERT(dest.offset == 0);
+
+  computeScaledAddress(dest, SecondScratchReg);
+
+  moveData(val, ScratchRegister);
+
+  as_sw(ScratchRegister, SecondScratchReg, NUNBOX32_PAYLOAD_OFFSET);
+}
+
+void MacroAssemblerMIPSCompat::storePayload(Register src,
+                                            const BaseIndex& dest) {
+  MOZ_ASSERT(dest.offset == 0);
+
+  computeScaledAddress(dest, SecondScratchReg);
+  as_sw(src, SecondScratchReg, NUNBOX32_PAYLOAD_OFFSET);
+}
+
+void MacroAssemblerMIPSCompat::storeTypeTag(ImmTag tag, Address dest) {
+  ma_li(SecondScratchReg, tag);
+  ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET));
+}
+
+void MacroAssemblerMIPSCompat::storeTypeTag(ImmTag tag, const BaseIndex& dest) {
+  MOZ_ASSERT(dest.offset == 0);
+
+  computeScaledAddress(dest, SecondScratchReg);
+  ma_li(ScratchRegister, tag);
+  as_sw(ScratchRegister, SecondScratchReg, TAG_OFFSET);
+}
+
+void MacroAssemblerMIPSCompat::breakpoint() { as_break(0); }
+
+void MacroAssemblerMIPSCompat::ensureDouble(const ValueOperand& source,
+                                            FloatRegister dest,
+                                            Label* failure) {
+  Label isDouble, done;
+  asMasm().branchTestDouble(Assembler::Equal, source.typeReg(), &isDouble);
+  asMasm().branchTestInt32(Assembler::NotEqual, source.typeReg(), failure);
+
+  convertInt32ToDouble(source.payloadReg(), dest);
+  jump(&done);
+
+  bind(&isDouble);
+  unboxDouble(source, dest);
+
+  bind(&done);
+}
+
+void MacroAssemblerMIPSCompat::checkStackAlignment() {
+#ifdef DEBUG
+  Label aligned;
+  as_andi(ScratchRegister, sp, ABIStackAlignment - 1);
+  ma_b(ScratchRegister, zero, &aligned, Equal, ShortJump);
+  as_break(BREAK_STACK_UNALIGNED);
+  bind(&aligned);
+#endif
+}
+
+void MacroAssemblerMIPSCompat::alignStackPointer() {
+  movePtr(StackPointer, SecondScratchReg);
+  asMasm().subPtr(Imm32(sizeof(intptr_t)), StackPointer);
+  asMasm().andPtr(Imm32(~(ABIStackAlignment - 1)), StackPointer);
+  storePtr(SecondScratchReg, Address(StackPointer, 0));
+}
+
+void MacroAssemblerMIPSCompat::restoreStackPointer() {
+  loadPtr(Address(StackPointer, 0), StackPointer);
+}
+
+void MacroAssemblerMIPSCompat::handleFailureWithHandlerTail(
+    Label* profilerExitTail) {
+  // Reserve space for exception information.
+  int size = (sizeof(ResumeFromException) + ABIStackAlignment) &
+             ~(ABIStackAlignment - 1);
+  asMasm().subPtr(Imm32(size), StackPointer);
+  ma_move(a0, StackPointer);  // Use a0 since it is a first function argument
+
+  // Call the handler.
+  using Fn = void (*)(ResumeFromException * rfe);
+  asMasm().setupUnalignedABICall(a1);
+  asMasm().passABIArg(a0);
+  asMasm().callWithABI<Fn, HandleException>(
+      MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckHasExitFrame);
+
+  Label entryFrame;
+  Label catch_;
+  Label finally;
+  Label returnBaseline;
+  Label returnIon;
+  Label bailout;
+  Label wasm;
+  Label wasmCatch;
+
+  // Already clobbered a0, so use it...
+  load32(Address(StackPointer, ResumeFromException::offsetOfKind()), a0);
+  asMasm().branch32(Assembler::Equal, a0,
+                    Imm32(ExceptionResumeKind::EntryFrame), &entryFrame);
+  asMasm().branch32(Assembler::Equal, a0, Imm32(ExceptionResumeKind::Catch),
+                    &catch_);
+  asMasm().branch32(Assembler::Equal, a0, Imm32(ExceptionResumeKind::Finally),
+                    &finally);
+  asMasm().branch32(Assembler::Equal, r0,
+                    Imm32(ExceptionResumeKind::ForcedReturnBaseline),
+                    &returnBaseline);
+  asMasm().branch32(Assembler::Equal, r0,
+                    Imm32(ExceptionResumeKind::ForcedReturnIon), &returnIon);
+  asMasm().branch32(Assembler::Equal, a0, Imm32(ExceptionResumeKind::Bailout),
+                    &bailout);
+  asMasm().branch32(Assembler::Equal, a0, Imm32(ExceptionResumeKind::Wasm),
+                    &wasm);
+  asMasm().branch32(Assembler::Equal, a0, Imm32(ExceptionResumeKind::WasmCatch),
+                    &wasmCatch);
+
+  breakpoint();  // Invalid kind.
+
+  // No exception handler. Load the error value, load the new stack pointer
+  // and return from the entry frame.
+  bind(&entryFrame);
+  asMasm().moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+
+  // We're going to be returning by the ion calling convention
+  ma_pop(ra);
+  as_jr(ra);
+  as_nop();
+
+  // If we found a catch handler, this must be a baseline frame. Restore
+  // state and jump to the catch block.
+  bind(&catch_);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfTarget()), a0);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+  jump(a0);
+
+  // If we found a finally block, this must be a baseline frame. Push two
+  // values expected by the finally block: the exception and BooleanValue(true).
+  bind(&finally);
+  ValueOperand exception = ValueOperand(a1, a2);
+  loadValue(Address(sp, ResumeFromException::offsetOfException()), exception);
+
+  loadPtr(Address(sp, ResumeFromException::offsetOfTarget()), a0);
+  loadPtr(Address(sp, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(sp, ResumeFromException::offsetOfStackPointer()), sp);
+
+  pushValue(exception);
+  pushValue(BooleanValue(true));
+  jump(a0);
+
+  // Return BaselineFrame->returnValue() to the caller.
+  // Used in debug mode and for GeneratorReturn.
+  Label profilingInstrumentation;
+  bind(&returnBaseline);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+  loadValue(Address(FramePointer, BaselineFrame::reverseOffsetOfReturnValue()),
+            JSReturnOperand);
+  ma_move(StackPointer, FramePointer);
+  pop(FramePointer);
+  jump(&profilingInstrumentation);
+
+  // Return the given value to the caller.
+  bind(&returnIon);
+  loadValue(Address(StackPointer, ResumeFromException::offsetOfException()),
+            JSReturnOperand);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+
+  // If profiling is enabled, then update the lastProfilingFrame to refer to
+  // caller frame before returning. This code is shared by ForcedReturnIon
+  // and ForcedReturnBaseline.
+  bind(&profilingInstrumentation);
+  {
+    Label skipProfilingInstrumentation;
+    // Test if profiler enabled.
+    AbsoluteAddress addressOfEnabled(
+        asMasm().runtime()->geckoProfiler().addressOfEnabled());
+    asMasm().branch32(Assembler::Equal, addressOfEnabled, Imm32(0),
+                      &skipProfilingInstrumentation);
+    jump(profilerExitTail);
+    bind(&skipProfilingInstrumentation);
+  }
+
+  ret();
+
+  // If we are bailing out to baseline to handle an exception, jump to
+  // the bailout tail stub. Load 1 (true) in ReturnReg to indicate success.
+  bind(&bailout);
+  loadPtr(Address(sp, ResumeFromException::offsetOfBailoutInfo()), a2);
+  ma_li(ReturnReg, Imm32(1));
+  loadPtr(Address(sp, ResumeFromException::offsetOfTarget()), a1);
+  jump(a1);
+
+  // If we are throwing and the innermost frame was a wasm frame, reset SP and
+  // FP; SP is pointing to the unwound return address to the wasm entry, so
+  // we can just ret().
+  bind(&wasm);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+  ret();
+
+  // Found a wasm catch handler, restore state and jump to it.
+  bind(&wasmCatch);
+  loadPtr(Address(sp, ResumeFromException::offsetOfTarget()), a1);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfFramePointer()),
+          FramePointer);
+  loadPtr(Address(StackPointer, ResumeFromException::offsetOfStackPointer()),
+          StackPointer);
+  jump(a1);
+}
+
+CodeOffset MacroAssemblerMIPSCompat::toggledJump(Label* label) {
+  CodeOffset ret(nextOffset().getOffset());
+  ma_b(label);
+  return ret;
+}
+
+CodeOffset MacroAssemblerMIPSCompat::toggledCall(JitCode* target,
+                                                 bool enabled) {
+  BufferOffset bo = nextOffset();
+  CodeOffset offset(bo.getOffset());
+  addPendingJump(bo, ImmPtr(target->raw()), RelocationKind::JITCODE);
+  ma_liPatchable(ScratchRegister, ImmPtr(target->raw()));
+  if (enabled) {
+    as_jalr(ScratchRegister);
+    as_nop();
+  } else {
+    as_nop();
+    as_nop();
+  }
+  MOZ_ASSERT_IF(!oom(), nextOffset().getOffset() - offset.offset() ==
+                            ToggledCallSize(nullptr));
+  return offset;
+}
+
+void MacroAssemblerMIPSCompat::profilerEnterFrame(Register framePtr,
+                                                  Register scratch) {
+  asMasm().loadJSContext(scratch);
+  loadPtr(Address(scratch, offsetof(JSContext, profilingActivation_)), scratch);
+  storePtr(framePtr,
+           Address(scratch, JitActivation::offsetOfLastProfilingFrame()));
+  storePtr(ImmPtr(nullptr),
+           Address(scratch, JitActivation::offsetOfLastProfilingCallSite()));
+}
+
+void MacroAssemblerMIPSCompat::profilerExitFrame() {
+  jump(asMasm().runtime()->jitRuntime()->getProfilerExitFrameTail());
+}
+
+void MacroAssembler::subFromStackPtr(Imm32 imm32) {
+  if (imm32.value) {
+    asMasm().subPtr(imm32, StackPointer);
+  }
+}
+
+//{{{ check_macroassembler_style
+// ===============================================================
+// Stack manipulation functions.
+
+size_t MacroAssembler::PushRegsInMaskSizeInBytes(LiveRegisterSet set) {
+  return set.gprs().size() * sizeof(intptr_t) + set.fpus().getPushSizeInBytes();
+}
+
+void MacroAssembler::PushRegsInMask(LiveRegisterSet set) {
+  int32_t diffF = set.fpus().getPushSizeInBytes();
+  int32_t diffG = set.gprs().size() * sizeof(intptr_t);
+
+  reserveStack(diffG);
+  for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) {
+    diffG -= sizeof(intptr_t);
+    storePtr(*iter, Address(StackPointer, diffG));
+  }
+  MOZ_ASSERT(diffG == 0);
+
+#ifdef ENABLE_WASM_SIMD
+#  error "Needs more careful logic if SIMD is enabled"
+#endif
+
+  if (diffF > 0) {
+    // Double values have to be aligned. We reserve extra space so that we can
+    // start writing from the first aligned location.
+    // We reserve a whole extra double so that the buffer has even size.
+    ma_and(SecondScratchReg, sp, Imm32(~(ABIStackAlignment - 1)));
+    reserveStack(diffF);
+
+    diffF -= sizeof(double);
+
+    for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush());
+         iter.more(); ++iter) {
+      as_sdc1(*iter, SecondScratchReg, -diffF);
+      diffF -= sizeof(double);
+    }
+
+    MOZ_ASSERT(diffF == 0);
+  }
+}
+
+void MacroAssembler::PopRegsInMaskIgnore(LiveRegisterSet set,
+                                         LiveRegisterSet ignore) {
+  int32_t diffG = set.gprs().size() * sizeof(intptr_t);
+  int32_t diffF = set.fpus().getPushSizeInBytes();
+  const int32_t reservedG = diffG;
+  const int32_t reservedF = diffF;
+
+#ifdef ENABLE_WASM_SIMD
+#  error "Needs more careful logic if SIMD is enabled"
+#endif
+
+  if (reservedF > 0) {
+    // Read the buffer form the first aligned location.
+    ma_addu(SecondScratchReg, sp, Imm32(reservedF));
+    ma_and(SecondScratchReg, SecondScratchReg, Imm32(~(ABIStackAlignment - 1)));
+
+    diffF -= sizeof(double);
+
+    LiveFloatRegisterSet fpignore(ignore.fpus().reduceSetForPush());
+    for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush());
+         iter.more(); ++iter) {
+      if (!ignore.has(*iter)) {
+        as_ldc1(*iter, SecondScratchReg, -diffF);
+      }
+      diffF -= sizeof(double);
+    }
+    freeStack(reservedF);
+    MOZ_ASSERT(diffF == 0);
+  }
+
+  for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) {
+    diffG -= sizeof(intptr_t);
+    if (!ignore.has(*iter)) {
+      loadPtr(Address(StackPointer, diffG), *iter);
+    }
+  }
+  freeStack(reservedG);
+  MOZ_ASSERT(diffG == 0);
+}
+
+void MacroAssembler::storeRegsInMask(LiveRegisterSet set, Address dest,
+                                     Register scratch) {
+  int32_t diffF = set.fpus().getPushSizeInBytes();
+  int32_t diffG = set.gprs().size() * sizeof(intptr_t);
+
+  MOZ_ASSERT(dest.offset >= diffG + diffF);
+  MOZ_ASSERT(dest.base == StackPointer);
+
+  for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) {
+    diffG -= sizeof(intptr_t);
+    dest.offset -= sizeof(intptr_t);
+    storePtr(*iter, dest);
+  }
+  MOZ_ASSERT(diffG == 0);
+
+#ifdef ENABLE_WASM_SIMD
+#  error "Needs more careful logic if SIMD is enabled"
+#endif
+
+  if (diffF > 0) {
+    computeEffectiveAddress(dest, scratch);
+    ma_and(scratch, scratch, Imm32(~(ABIStackAlignment - 1)));
+
+    diffF -= sizeof(double);
+
+    for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush());
+         iter.more(); ++iter) {
+      as_sdc1(*iter, scratch, -diffF);
+      diffF -= sizeof(double);
+    }
+    MOZ_ASSERT(diffF == 0);
+  }
+}
+// ===============================================================
+// ABI function calls.
+
+void MacroAssembler::setupUnalignedABICall(Register scratch) {
+  MOZ_ASSERT(!IsCompilingWasm(), "wasm should only use aligned ABI calls");
+  setupNativeABICall();
+  dynamicAlignment_ = true;
+
+  ma_move(scratch, StackPointer);
+
+  // Force sp to be aligned
+  asMasm().subPtr(Imm32(sizeof(uintptr_t)), StackPointer);
+  ma_and(StackPointer, StackPointer, Imm32(~(ABIStackAlignment - 1)));
+  storePtr(scratch, Address(StackPointer, 0));
+}
+
+void MacroAssembler::callWithABIPre(uint32_t* stackAdjust, bool callFromWasm) {
+  MOZ_ASSERT(inCall_);
+  uint32_t stackForCall = abiArgs_.stackBytesConsumedSoFar();
+
+  // Reserve place for $ra.
+  stackForCall += sizeof(intptr_t);
+
+  if (dynamicAlignment_) {
+    stackForCall += ComputeByteAlignment(stackForCall, ABIStackAlignment);
+  } else {
+    uint32_t alignmentAtPrologue = callFromWasm ? sizeof(wasm::Frame) : 0;
+    stackForCall += ComputeByteAlignment(
+        stackForCall + framePushed() + alignmentAtPrologue, ABIStackAlignment);
+  }
+
+  *stackAdjust = stackForCall;
+  reserveStack(stackForCall);
+
+  // Save $ra because call is going to clobber it. Restore it in
+  // callWithABIPost. NOTE: This is needed for calls from SharedIC.
+  // Maybe we can do this differently.
+  storePtr(ra, Address(StackPointer, stackForCall - sizeof(intptr_t)));
+
+  // Position all arguments.
+  {
+    enoughMemory_ &= moveResolver_.resolve();
+    if (!enoughMemory_) {
+      return;
+    }
+
+    MoveEmitter emitter(*this);
+    emitter.emit(moveResolver_);
+    emitter.finish();
+  }
+
+  assertStackAlignment(ABIStackAlignment);
+}
+
+void MacroAssembler::callWithABIPost(uint32_t stackAdjust, MoveOp::Type result,
+                                     bool callFromWasm) {
+  // Restore ra value (as stored in callWithABIPre()).
+  loadPtr(Address(StackPointer, stackAdjust - sizeof(intptr_t)), ra);
+
+  if (dynamicAlignment_) {
+    // Restore sp value from stack (as stored in setupUnalignedABICall()).
+    loadPtr(Address(StackPointer, stackAdjust), StackPointer);
+    // Use adjustFrame instead of freeStack because we already restored sp.
+    adjustFrame(-stackAdjust);
+  } else {
+    freeStack(stackAdjust);
+  }
+
+#ifdef DEBUG
+  MOZ_ASSERT(inCall_);
+  inCall_ = false;
+#endif
+}
+
+void MacroAssembler::callWithABINoProfiler(Register fun, MoveOp::Type result) {
+  // Load the callee in t9, no instruction between the lw and call
+  // should clobber it. Note that we can't use fun.base because it may
+  // be one of the IntArg registers clobbered before the call.
+  ma_move(t9, fun);
+  uint32_t stackAdjust;
+  callWithABIPre(&stackAdjust);
+  call(t9);
+  callWithABIPost(stackAdjust, result);
+}
+
+void MacroAssembler::callWithABINoProfiler(const Address& fun,
+                                           MoveOp::Type result) {
+  // Load the callee in t9, as above.
+  loadPtr(Address(fun.base, fun.offset), t9);
+  uint32_t stackAdjust;
+  callWithABIPre(&stackAdjust);
+  call(t9);
+  callWithABIPost(stackAdjust, result);
+}
+// ===============================================================
+// Move instructions
+
+void MacroAssembler::moveValue(const TypedOrValueRegister& src,
+                               const ValueOperand& dest) {
+  if (src.hasValue()) {
+    moveValue(src.valueReg(), dest);
+    return;
+  }
+
+  MIRType type = src.type();
+  AnyRegister reg = src.typedReg();
+
+  if (!IsFloatingPointType(type)) {
+    if (reg.gpr() != dest.payloadReg()) {
+      move32(reg.gpr(), dest.payloadReg());
+    }
+    mov(ImmWord(MIRTypeToTag(type)), dest.typeReg());
+    return;
+  }
+
+  ScratchDoubleScope scratch(*this);
+  FloatRegister freg = reg.fpu();
+  if (type == MIRType::Float32) {
+    convertFloat32ToDouble(freg, scratch);
+    freg = scratch;
+  }
+  boxDouble(freg, dest, scratch);
+}
+
+void MacroAssembler::moveValue(const ValueOperand& src,
+                               const ValueOperand& dest) {
+  Register s0 = src.typeReg();
+  Register s1 = src.payloadReg();
+  Register d0 = dest.typeReg();
+  Register d1 = dest.payloadReg();
+
+  // Either one or both of the source registers could be the same as a
+  // destination register.
+  if (s1 == d0) {
+    if (s0 == d1) {
+      // If both are, this is just a swap of two registers.
+      ScratchRegisterScope scratch(*this);
+      MOZ_ASSERT(d1 != scratch);
+      MOZ_ASSERT(d0 != scratch);
+      move32(d1, scratch);
+      move32(d0, d1);
+      move32(scratch, d0);
+      return;
+    }
+    // If only one is, copy that source first.
+    std::swap(s0, s1);
+    std::swap(d0, d1);
+  }
+
+  if (s0 != d0) {
+    move32(s0, d0);
+  }
+  if (s1 != d1) {
+    move32(s1, d1);
+  }
+}
+
+void MacroAssembler::moveValue(const Value& src, const ValueOperand& dest) {
+  move32(Imm32(src.toNunboxTag()), dest.typeReg());
+  if (src.isGCThing()) {
+    movePtr(ImmGCPtr(src.toGCThing()), dest.payloadReg());
+  } else {
+    move32(Imm32(src.toNunboxPayload()), dest.payloadReg());
+  }
+}
+
+// ===============================================================
+// Branch functions
+
+void MacroAssembler::branchValueIsNurseryCell(Condition cond,
+                                              const Address& address,
+                                              Register temp, Label* label) {
+  MOZ_ASSERT(cond == Assembler::Equal || cond == Assembler::NotEqual);
+
+  Label done;
+
+  branchTestGCThing(Assembler::NotEqual, address,
+                    cond == Assembler::Equal ? &done : label);
+
+  loadPtr(address, temp);
+  branchPtrInNurseryChunk(cond, temp, InvalidReg, label);
+
+  bind(&done);
+}
+
+void MacroAssembler::branchValueIsNurseryCell(Condition cond,
+                                              ValueOperand value, Register temp,
+                                              Label* label) {
+  MOZ_ASSERT(cond == Assembler::Equal || cond == Assembler::NotEqual);
+
+  Label done;
+
+  branchTestGCThing(Assembler::NotEqual, value,
+                    cond == Assembler::Equal ? &done : label);
+  branchPtrInNurseryChunk(cond, value.payloadReg(), temp, label);
+
+  bind(&done);
+}
+
+void MacroAssembler::branchTestValue(Condition cond, const ValueOperand& lhs,
+                                     const Value& rhs, Label* label) {
+  MOZ_ASSERT(cond == Equal || cond == NotEqual);
+  ScratchRegisterScope scratch(*this);
+  moveData(rhs, scratch);
+
+  if (cond == Equal) {
+    Label done;
+    ma_b(lhs.payloadReg(), scratch, &done, NotEqual, ShortJump);
+    { ma_b(lhs.typeReg(), Imm32(getType(rhs)), label, Equal); }
+    bind(&done);
+  } else {
+    ma_b(lhs.payloadReg(), scratch, label, NotEqual);
+
+    ma_b(lhs.typeReg(), Imm32(getType(rhs)), label, NotEqual);
+  }
+}
+
+// ========================================================================
+// Memory access primitives.
+template <typename T>
+void MacroAssembler::storeUnboxedValue(const ConstantOrRegister& value,
+                                       MIRType valueType, const T& dest) {
+  MOZ_ASSERT(valueType < MIRType::Value);
+
+  if (valueType == MIRType::Double) {
+    storeDouble(value.reg().typedReg().fpu(), dest);
+    return;
+  }
+
+  // Store the type tag.
+  storeTypeTag(ImmType(ValueTypeFromMIRType(valueType)), dest);
+
+  // Store the payload.
+  if (value.constant()) {
+    storePayload(value.value(), dest);
+  } else {
+    storePayload(value.reg().typedReg().gpr(), dest);
+  }
+}
+
+template void MacroAssembler::storeUnboxedValue(const ConstantOrRegister& value,
+                                                MIRType valueType,
+                                                const Address& dest);
+template void MacroAssembler::storeUnboxedValue(
+    const ConstantOrRegister& value, MIRType valueType,
+    const BaseObjectElementIndex& dest);
+
+void MacroAssembler::PushBoxed(FloatRegister reg) { Push(reg); }
+
+void MacroAssembler::wasmBoundsCheck32(Condition cond, Register index,
+                                       Register boundsCheckLimit, Label* ok) {
+  ma_b(index, boundsCheckLimit, ok, cond);
+}
+
+void MacroAssembler::wasmBoundsCheck32(Condition cond, Register index,
+                                       Address boundsCheckLimit, Label* ok) {
+  SecondScratchRegisterScope scratch2(*this);
+  load32(boundsCheckLimit, SecondScratchReg);
+  ma_b(index, SecondScratchReg, ok, cond);
+}
+
+void MacroAssembler::wasmTruncateDoubleToUInt32(FloatRegister input,
+                                                Register output,
+                                                bool isSaturating,
+                                                Label* oolEntry) {
+  Label done;
+
+  as_truncwd(ScratchFloat32Reg, input);
+  ma_li(ScratchRegister, Imm32(INT32_MAX));
+  moveFromFloat32(ScratchFloat32Reg, output);
+
+  // For numbers in  -1.[ : ]INT32_MAX range do nothing more
+  ma_b(output, ScratchRegister, &done, Assembler::Below, ShortJump);
+
+  loadConstantDouble(double(INT32_MAX + 1ULL), ScratchDoubleReg);
+  ma_li(ScratchRegister, Imm32(INT32_MIN));
+  as_subd(ScratchDoubleReg, input, ScratchDoubleReg);
+  as_truncwd(ScratchFloat32Reg, ScratchDoubleReg);
+  as_cfc1(SecondScratchReg, Assembler::FCSR);
+  moveFromFloat32(ScratchFloat32Reg, output);
+  ma_ext(SecondScratchReg, SecondScratchReg, Assembler::CauseV, 1);
+  ma_addu(output, ScratchRegister);
+
+  ma_b(SecondScratchReg, Imm32(0), oolEntry, Assembler::NotEqual);
+
+  bind(&done);
+}
+
+void MacroAssembler::wasmTruncateFloat32ToUInt32(FloatRegister input,
+                                                 Register output,
+                                                 bool isSaturating,
+                                                 Label* oolEntry) {
+  Label done;
+
+  as_truncws(ScratchFloat32Reg, input);
+  ma_li(ScratchRegister, Imm32(INT32_MAX));
+  moveFromFloat32(ScratchFloat32Reg, output);
+  // For numbers in  -1.[ : ]INT32_MAX range do nothing more
+  ma_b(output, ScratchRegister, &done, Assembler::Below, ShortJump);
+
+  loadConstantFloat32(float(INT32_MAX + 1ULL), ScratchFloat32Reg);
+  ma_li(ScratchRegister, Imm32(INT32_MIN));
+  as_subs(ScratchFloat32Reg, input, ScratchFloat32Reg);
+  as_truncws(ScratchFloat32Reg, ScratchFloat32Reg);
+  as_cfc1(SecondScratchReg, Assembler::FCSR);
+  moveFromFloat32(ScratchFloat32Reg, output);
+  ma_ext(SecondScratchReg, SecondScratchReg, Assembler::CauseV, 1);
+  ma_addu(output, ScratchRegister);
+
+  // Guard against negative values that result in 0 due the precision loss.
+  as_sltiu(ScratchRegister, output, 1);
+  ma_or(SecondScratchReg, ScratchRegister);
+
+  ma_b(SecondScratchReg, Imm32(0), oolEntry, Assembler::NotEqual);
+
+  bind(&done);
+}
+
+void MacroAssembler::wasmLoadI64(const wasm::MemoryAccessDesc& access,
+                                 Register memoryBase, Register ptr,
+                                 Register ptrScratch, Register64 output) {
+  wasmLoadI64Impl(access, memoryBase, ptr, ptrScratch, output, InvalidReg);
+}
+
+void MacroAssembler::wasmUnalignedLoadI64(const wasm::MemoryAccessDesc& access,
+                                          Register memoryBase, Register ptr,
+                                          Register ptrScratch,
+                                          Register64 output, Register tmp) {
+  wasmLoadI64Impl(access, memoryBase, ptr, ptrScratch, output, tmp);
+}
+
+void MacroAssembler::wasmStoreI64(const wasm::MemoryAccessDesc& access,
+                                  Register64 value, Register memoryBase,
+                                  Register ptr, Register ptrScratch) {
+  wasmStoreI64Impl(access, value, memoryBase, ptr, ptrScratch, InvalidReg);
+}
+
+void MacroAssembler::wasmUnalignedStoreI64(const wasm::MemoryAccessDesc& access,
+                                           Register64 value,
+                                           Register memoryBase, Register ptr,
+                                           Register ptrScratch, Register tmp) {
+  wasmStoreI64Impl(access, value, memoryBase, ptr, ptrScratch, tmp);
+}
+
+void MacroAssemblerMIPSCompat::wasmLoadI64Impl(
+    const wasm::MemoryAccessDesc& access, Register memoryBase, Register ptr,
+    Register ptrScratch, Register64 output, Register tmp) {
+  uint32_t offset = access.offset();
+  MOZ_ASSERT_IF(offset, ptrScratch != InvalidReg);
+
+  MOZ_ASSERT(!access.isZeroExtendSimd128Load());
+  MOZ_ASSERT(!access.isSplatSimd128Load());
+  MOZ_ASSERT(!access.isWidenSimd128Load());
+
+  // Maybe add the offset.
+  if (offset) {
+    asMasm().movePtr(ptr, ptrScratch);
+    asMasm().addPtr(Imm32(offset), ptrScratch);
+    ptr = ptrScratch;
+  }
+
+  unsigned byteSize = access.byteSize();
+  bool isSigned;
+
+  switch (access.type()) {
+    case Scalar::Int8:
+      isSigned = true;
+      break;
+    case Scalar::Uint8:
+      isSigned = false;
+      break;
+    case Scalar::Int16:
+      isSigned = true;
+      break;
+    case Scalar::Uint16:
+      isSigned = false;
+      break;
+    case Scalar::Int32:
+      isSigned = true;
+      break;
+    case Scalar::Uint32:
+      isSigned = false;
+      break;
+    case Scalar::Int64:
+      isSigned = true;
+      break;
+    default:
+      MOZ_CRASH("unexpected array type");
+  }
+
+  BaseIndex address(memoryBase, ptr, TimesOne);
+  MOZ_ASSERT(INT64LOW_OFFSET == 0);
+  if (IsUnaligned(access)) {
+    MOZ_ASSERT(tmp != InvalidReg);
+    if (byteSize <= 4) {
+      asMasm().ma_load_unaligned(access, output.low, address, tmp,
+                                 static_cast<LoadStoreSize>(8 * byteSize),
+                                 isSigned ? SignExtend : ZeroExtend);
+      if (!isSigned) {
+        asMasm().move32(Imm32(0), output.high);
+      } else {
+        asMasm().ma_sra(output.high, output.low, Imm32(31));
+      }
+    } else {
+      MOZ_ASSERT(output.low != ptr);
+      asMasm().ma_load_unaligned(access, output.low, address, tmp, SizeWord,
+                                 ZeroExtend);
+      asMasm().ma_load_unaligned(
+          access, output.high,
+          BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), tmp, SizeWord,
+          SignExtend);
+    }
+    return;
+  }
+
+  asMasm().memoryBarrierBefore(access.sync());
+  if (byteSize <= 4) {
+    asMasm().ma_load(output.low, address,
+                     static_cast<LoadStoreSize>(8 * byteSize),
+                     isSigned ? SignExtend : ZeroExtend);
+    asMasm().append(access, asMasm().size() - 4);
+    if (!isSigned) {
+      asMasm().move32(Imm32(0), output.high);
+    } else {
+      asMasm().ma_sra(output.high, output.low, Imm32(31));
+    }
+  } else {
+    MOZ_ASSERT(output.low != ptr);
+    asMasm().ma_load(output.low, BaseIndex(HeapReg, ptr, TimesOne), SizeWord);
+    asMasm().append(access, asMasm().size() - 4);
+    asMasm().ma_load(output.high,
+                     BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET),
+                     SizeWord);
+    asMasm().append(access, asMasm().size() - 4);
+  }
+  asMasm().memoryBarrierAfter(access.sync());
+}
+
+void MacroAssemblerMIPSCompat::wasmStoreI64Impl(
+    const wasm::MemoryAccessDesc& access, Register64 value, Register memoryBase,
+    Register ptr, Register ptrScratch, Register tmp) {
+  uint32_t offset = access.offset();
+  MOZ_ASSERT(offset < asMasm().wasmMaxOffsetGuardLimit());
+  MOZ_ASSERT_IF(offset, ptrScratch != InvalidReg);
+
+  // Maybe add the offset.
+  if (offset) {
+    asMasm().addPtr(Imm32(offset), ptrScratch);
+    ptr = ptrScratch;
+  }
+
+  unsigned byteSize = access.byteSize();
+  bool isSigned;
+  switch (access.type()) {
+    case Scalar::Int8:
+      isSigned = true;
+      break;
+    case Scalar::Uint8:
+      isSigned = false;
+      break;
+    case Scalar::Int16:
+      isSigned = true;
+      break;
+    case Scalar::Uint16:
+      isSigned = false;
+      break;
+    case Scalar::Int32:
+      isSigned = true;
+      break;
+    case Scalar::Uint32:
+      isSigned = false;
+      break;
+    case Scalar::Int64:
+      isSigned = true;
+      break;
+    default:
+      MOZ_CRASH("unexpected array type");
+  }
+
+  MOZ_ASSERT(INT64LOW_OFFSET == 0);
+  BaseIndex address(memoryBase, ptr, TimesOne);
+  if (IsUnaligned(access)) {
+    MOZ_ASSERT(tmp != InvalidReg);
+    if (byteSize <= 4) {
+      asMasm().ma_store_unaligned(access, value.low, address, tmp,
+                                  static_cast<LoadStoreSize>(8 * byteSize),
+                                  isSigned ? SignExtend : ZeroExtend);
+    } else {
+      asMasm().ma_store_unaligned(
+          access, value.high,
+          BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), tmp, SizeWord,
+          SignExtend);
+      asMasm().ma_store_unaligned(access, value.low, address, tmp, SizeWord,
+                                  ZeroExtend);
+    }
+    return;
+  }
+
+  asMasm().memoryBarrierBefore(access.sync());
+  if (byteSize <= 4) {
+    asMasm().ma_store(value.low, address,
+                      static_cast<LoadStoreSize>(8 * byteSize));
+    asMasm().append(access, asMasm().size() - 4);
+  } else {
+    asMasm().ma_store(value.high,
+                      BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET),
+                      SizeWord);
+    asMasm().append(access, asMasm().size() - 4);
+    asMasm().ma_store(value.low, address, SizeWord);
+  }
+  asMasm().memoryBarrierAfter(access.sync());
+}
+
+static void EnterAtomic64Region(MacroAssembler& masm,
+                                const wasm::MemoryAccessDesc& access,
+                                Register addr, Register spinlock,
+                                Register scratch) {
+  masm.movePtr(wasm::SymbolicAddress::js_jit_gAtomic64Lock, spinlock);
+
+  masm.append(access, masm.size());
+  masm.as_lbu(
+      zero, addr,
+      7);  // Force memory trap on invalid access before we enter the spinlock.
+
+  Label tryLock;
+
+  masm.memoryBarrier(MembarFull);
+
+  masm.bind(&tryLock);
+
+  masm.as_ll(scratch, spinlock, 0);
+  masm.ma_b(scratch, scratch, &tryLock, Assembler::NonZero, ShortJump);
+  masm.ma_li(scratch, Imm32(1));
+  masm.as_sc(scratch, spinlock, 0);
+  masm.ma_b(scratch, scratch, &tryLock, Assembler::Zero, ShortJump);
+
+  masm.memoryBarrier(MembarFull);
+}
+
+static void ExitAtomic64Region(MacroAssembler& masm, Register spinlock) {
+  masm.memoryBarrier(MembarFull);
+  masm.as_sw(zero, spinlock, 0);
+  masm.memoryBarrier(MembarFull);
+}
+
+template <typename T>
+static void AtomicLoad64(MacroAssembler& masm,
+                         const wasm::MemoryAccessDesc& access, const T& mem,
+                         Register64 temp, Register64 output) {
+  MOZ_ASSERT(temp.low == InvalidReg && temp.high == InvalidReg);
+
+  masm.computeEffectiveAddress(mem, SecondScratchReg);
+
+  EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg,
+                      /* spinlock= */ ScratchRegister,
+                      /* scratch= */ output.low);
+
+  masm.load64(Address(SecondScratchReg, 0), output);
+
+  ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister);
+}
+
+void MacroAssembler::wasmAtomicLoad64(const wasm::MemoryAccessDesc& access,
+                                      const Address& mem, Register64 temp,
+                                      Register64 output) {
+  AtomicLoad64(*this, access, mem, temp, output);
+}
+
+void MacroAssembler::wasmAtomicLoad64(const wasm::MemoryAccessDesc& access,
+                                      const BaseIndex& mem, Register64 temp,
+                                      Register64 output) {
+  AtomicLoad64(*this, access, mem, temp, output);
+}
+
+template <typename T>
+void MacroAssemblerMIPSCompat::wasmAtomicStore64(
+    const wasm::MemoryAccessDesc& access, const T& mem, Register temp,
+    Register64 value) {
+  computeEffectiveAddress(mem, SecondScratchReg);
+
+  EnterAtomic64Region(asMasm(), access, /* addr= */ SecondScratchReg,
+                      /* spinlock= */ ScratchRegister, /* scratch= */ temp);
+
+  store64(value, Address(SecondScratchReg, 0));
+
+  ExitAtomic64Region(asMasm(), /* spinlock= */ ScratchRegister);
+}
+
+template void MacroAssemblerMIPSCompat::wasmAtomicStore64(
+    const wasm::MemoryAccessDesc& access, const Address& mem, Register temp,
+    Register64 value);
+template void MacroAssemblerMIPSCompat::wasmAtomicStore64(
+    const wasm::MemoryAccessDesc& access, const BaseIndex& mem, Register temp,
+    Register64 value);
+
+template <typename T>
+static void WasmCompareExchange64(MacroAssembler& masm,
+                                  const wasm::MemoryAccessDesc& access,
+                                  const T& mem, Register64 expect,
+                                  Register64 replace, Register64 output) {
+  MOZ_ASSERT(output != expect);
+  MOZ_ASSERT(output != replace);
+
+  Label exit;
+
+  masm.computeEffectiveAddress(mem, SecondScratchReg);
+  Address addr(SecondScratchReg, 0);
+
+  EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg,
+                      /* spinlock= */ ScratchRegister,
+                      /* scratch= */ output.low);
+
+  masm.load64(addr, output);
+
+  masm.ma_b(output.low, expect.low, &exit, Assembler::NotEqual, ShortJump);
+  masm.ma_b(output.high, expect.high, &exit, Assembler::NotEqual, ShortJump);
+  masm.store64(replace, addr);
+  masm.bind(&exit);
+  ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister);
+}
+
+void MacroAssembler::wasmCompareExchange64(const wasm::MemoryAccessDesc& access,
+                                           const Address& mem,
+                                           Register64 expect,
+                                           Register64 replace,
+                                           Register64 output) {
+  WasmCompareExchange64(*this, access, mem, expect, replace, output);
+}
+
+void MacroAssembler::wasmCompareExchange64(const wasm::MemoryAccessDesc& access,
+                                           const BaseIndex& mem,
+                                           Register64 expect,
+                                           Register64 replace,
+                                           Register64 output) {
+  WasmCompareExchange64(*this, access, mem, expect, replace, output);
+}
+
+template <typename T>
+static void WasmAtomicExchange64(MacroAssembler& masm,
+                                 const wasm::MemoryAccessDesc& access,
+                                 const T& mem, Register64 src,
+                                 Register64 output) {
+  masm.computeEffectiveAddress(mem, SecondScratchReg);
+  Address addr(SecondScratchReg, 0);
+
+  EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg,
+                      /* spinlock= */ ScratchRegister,
+                      /* scratch= */ output.low);
+
+  masm.load64(addr, output);
+  masm.store64(src, addr);
+
+  ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister);
+}
+
+void MacroAssembler::wasmAtomicExchange64(const wasm::MemoryAccessDesc& access,
+                                          const Address& mem, Register64 src,
+                                          Register64 output) {
+  WasmAtomicExchange64(*this, access, mem, src, output);
+}
+
+void MacroAssembler::wasmAtomicExchange64(const wasm::MemoryAccessDesc& access,
+                                          const BaseIndex& mem, Register64 src,
+                                          Register64 output) {
+  WasmAtomicExchange64(*this, access, mem, src, output);
+}
+
+template <typename T>
+static void AtomicFetchOp64(MacroAssembler& masm,
+                            const wasm::MemoryAccessDesc& access, AtomicOp op,
+                            Register64 value, const T& mem, Register64 temp,
+                            Register64 output) {
+  masm.computeEffectiveAddress(mem, SecondScratchReg);
+
+  EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg,
+                      /* spinlock= */ ScratchRegister,
+                      /* scratch= */ output.low);
+
+  masm.load64(Address(SecondScratchReg, 0), output);
+
+  switch (op) {
+    case AtomicFetchAddOp:
+      masm.as_addu(temp.low, output.low, value.low);
+      masm.as_sltu(temp.high, temp.low, output.low);
+      masm.as_addu(temp.high, temp.high, output.high);
+      masm.as_addu(temp.high, temp.high, value.high);
+      break;
+    case AtomicFetchSubOp:
+      masm.as_sltu(temp.high, output.low, value.low);
+      masm.as_subu(temp.high, output.high, temp.high);
+      masm.as_subu(temp.low, output.low, value.low);
+      masm.as_subu(temp.high, temp.high, value.high);
+      break;
+    case AtomicFetchAndOp:
+      masm.as_and(temp.low, output.low, value.low);
+      masm.as_and(temp.high, output.high, value.high);
+      break;
+    case AtomicFetchOrOp:
+      masm.as_or(temp.low, output.low, value.low);
+      masm.as_or(temp.high, output.high, value.high);
+      break;
+    case AtomicFetchXorOp:
+      masm.as_xor(temp.low, output.low, value.low);
+      masm.as_xor(temp.high, output.high, value.high);
+      break;
+    default:
+      MOZ_CRASH();
+  }
+
+  masm.store64(temp, Address(SecondScratchReg, 0));
+
+  ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister);
+}
+
+void MacroAssembler::wasmAtomicFetchOp64(const wasm::MemoryAccessDesc& access,
+                                         AtomicOp op, Register64 value,
+                                         const Address& mem, Register64 temp,
+                                         Register64 output) {
+  AtomicFetchOp64(*this, access, op, value, mem, temp, output);
+}
+
+void MacroAssembler::wasmAtomicFetchOp64(const wasm::MemoryAccessDesc& access,
+                                         AtomicOp op, Register64 value,
+                                         const BaseIndex& mem, Register64 temp,
+                                         Register64 output) {
+  AtomicFetchOp64(*this, access, op, value, mem, temp, output);
+}
+
+// ========================================================================
+// Convert floating point.
+
+static const double TO_DOUBLE_HIGH_SCALE = 0x100000000;
+
+bool MacroAssembler::convertUInt64ToDoubleNeedsTemp() { return false; }
+
+void MacroAssembler::convertUInt64ToDouble(Register64 src, FloatRegister dest,
+                                           Register temp) {
+  MOZ_ASSERT(temp == Register::Invalid());
+  convertUInt32ToDouble(src.high, dest);
+  loadConstantDouble(TO_DOUBLE_HIGH_SCALE, ScratchDoubleReg);
+  mulDouble(ScratchDoubleReg, dest);
+  convertUInt32ToDouble(src.low, ScratchDoubleReg);
+  addDouble(ScratchDoubleReg, dest);
+}
+
+void MacroAssembler::convertInt64ToDouble(Register64 src, FloatRegister dest) {
+  convertInt32ToDouble(src.high, dest);
+  loadConstantDouble(TO_DOUBLE_HIGH_SCALE, ScratchDoubleReg);
+  mulDouble(ScratchDoubleReg, dest);
+  convertUInt32ToDouble(src.low, ScratchDoubleReg);
+  addDouble(ScratchDoubleReg, dest);
+}
+
+void MacroAssembler::convertIntPtrToDouble(Register src, FloatRegister dest) {
+  convertInt32ToDouble(src, dest);
+}
+
+//}}} check_macroassembler_style