1 files changed, 257 insertions, 0 deletions
diff --git a/js/src/jit/mips32/Lowering-mips32.cpp b/js/src/jit/mips32/Lowering-mips32.cpp
new file mode 100644
index 0000000000..721491c46b
--- /dev/null
+++ b/js/src/jit/mips32/Lowering-mips32.cpp
@@ -0,0 +1,257 @@
+/* -*- 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/Lowering-mips32.h"
+
+#include "jit/Lowering.h"
+#include "jit/mips32/Assembler-mips32.h"
+#include "jit/MIR.h"
+
+#include "jit/shared/Lowering-shared-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+LBoxAllocation LIRGeneratorMIPS::useBoxFixed(MDefinition* mir, Register reg1,
+                                             Register reg2, bool useAtStart) {
+  MOZ_ASSERT(mir->type() == MIRType::Value);
+  MOZ_ASSERT(reg1 != reg2);
+
+  ensureDefined(mir);
+  return LBoxAllocation(LUse(reg1, mir->virtualRegister(), useAtStart),
+                        LUse(reg2, VirtualRegisterOfPayload(mir), useAtStart));
+}
+
+void LIRGenerator::visitBox(MBox* box) {
+  MDefinition* inner = box->getOperand(0);
+
+  // If the box wrapped a double, it needs a new register.
+  if (IsFloatingPointType(inner->type())) {
+    defineBox(new (alloc()) LBoxFloatingPoint(
+                  useRegisterAtStart(inner), tempCopy(inner, 0), inner->type()),
+              box);
+    return;
+  }
+
+  if (box->canEmitAtUses()) {
+    emitAtUses(box);
+    return;
+  }
+
+  if (inner->isConstant()) {
+    defineBox(new (alloc()) LValue(inner->toConstant()->toJSValue()), box);
+    return;
+  }
+
+  LBox* lir = new (alloc()) LBox(use(inner), inner->type());
+
+  // Otherwise, we should not define a new register for the payload portion
+  // of the output, so bypass defineBox().
+  uint32_t vreg = getVirtualRegister();
+
+  // Note that because we're using BogusTemp(), we do not change the type of
+  // the definition. We also do not define the first output as "TYPE",
+  // because it has no corresponding payload at (vreg + 1). Also note that
+  // although we copy the input's original type for the payload half of the
+  // definition, this is only for clarity. BogusTemp() definitions are
+  // ignored.
+  lir->setDef(0, LDefinition(vreg, LDefinition::GENERAL));
+  lir->setDef(1, LDefinition::BogusTemp());
+  box->setVirtualRegister(vreg);
+  add(lir);
+}
+
+void LIRGenerator::visitUnbox(MUnbox* unbox) {
+  MDefinition* inner = unbox->getOperand(0);
+
+  // An unbox on mips reads in a type tag (either in memory or a register) and
+  // a payload. Unlike most instructions consuming a box, we ask for the type
+  // second, so that the result can re-use the first input.
+  MOZ_ASSERT(inner->type() == MIRType::Value);
+
+  ensureDefined(inner);
+
+  if (IsFloatingPointType(unbox->type())) {
+    LUnboxFloatingPoint* lir =
+        new (alloc()) LUnboxFloatingPoint(useBox(inner), unbox->type());
+    if (unbox->fallible()) {
+      assignSnapshot(lir, unbox->bailoutKind());
+    }
+    define(lir, unbox);
+    return;
+  }
+
+  // Swap the order we use the box pieces so we can re-use the payload
+  // register.
+  LUnbox* lir = new (alloc()) LUnbox;
+  lir->setOperand(0, usePayloadInRegisterAtStart(inner));
+  lir->setOperand(1, useType(inner, LUse::REGISTER));
+
+  if (unbox->fallible()) {
+    assignSnapshot(lir, unbox->bailoutKind());
+  }
+
+  // Types and payloads form two separate intervals. If the type becomes dead
+  // before the payload, it could be used as a Value without the type being
+  // recoverable. Unbox's purpose is to eagerly kill the definition of a type
+  // tag, so keeping both alive (for the purpose of gcmaps) is unappealing.
+  // Instead, we create a new virtual register.
+  defineReuseInput(lir, unbox, 0);
+}
+
+void LIRGenerator::visitReturnImpl(MDefinition* opd, bool isGenerator) {
+  MOZ_ASSERT(opd->type() == MIRType::Value);
+
+  LReturn* ins = new (alloc()) LReturn(isGenerator);
+  ins->setOperand(0, LUse(JSReturnReg_Type));
+  ins->setOperand(1, LUse(JSReturnReg_Data));
+  fillBoxUses(ins, 0, opd);
+  add(ins);
+}
+
+void LIRGeneratorMIPS::lowerUntypedPhiInput(MPhi* phi, uint32_t inputPosition,
+                                            LBlock* block, size_t lirIndex) {
+  MDefinition* operand = phi->getOperand(inputPosition);
+  LPhi* type = block->getPhi(lirIndex + VREG_TYPE_OFFSET);
+  LPhi* payload = block->getPhi(lirIndex + VREG_DATA_OFFSET);
+  type->setOperand(
+      inputPosition,
+      LUse(operand->virtualRegister() + VREG_TYPE_OFFSET, LUse::ANY));
+  payload->setOperand(inputPosition,
+                      LUse(VirtualRegisterOfPayload(operand), LUse::ANY));
+}
+
+void LIRGeneratorMIPS::defineInt64Phi(MPhi* phi, size_t lirIndex) {
+  LPhi* low = current->getPhi(lirIndex + INT64LOW_INDEX);
+  LPhi* high = current->getPhi(lirIndex + INT64HIGH_INDEX);
+
+  uint32_t lowVreg = getVirtualRegister();
+
+  phi->setVirtualRegister(lowVreg);
+
+  uint32_t highVreg = getVirtualRegister();
+  MOZ_ASSERT(lowVreg + INT64HIGH_INDEX == highVreg + INT64LOW_INDEX);
+
+  low->setDef(0, LDefinition(lowVreg, LDefinition::INT32));
+  high->setDef(0, LDefinition(highVreg, LDefinition::INT32));
+  annotate(high);
+  annotate(low);
+}
+
+void LIRGeneratorMIPS::lowerInt64PhiInput(MPhi* phi, uint32_t inputPosition,
+                                          LBlock* block, size_t lirIndex) {
+  MDefinition* operand = phi->getOperand(inputPosition);
+  LPhi* low = block->getPhi(lirIndex + INT64LOW_INDEX);
+  LPhi* high = block->getPhi(lirIndex + INT64HIGH_INDEX);
+  low->setOperand(inputPosition,
+                  LUse(operand->virtualRegister() + INT64LOW_INDEX, LUse::ANY));
+  high->setOperand(
+      inputPosition,
+      LUse(operand->virtualRegister() + INT64HIGH_INDEX, LUse::ANY));
+}
+
+void LIRGeneratorMIPS::lowerTruncateDToInt32(MTruncateToInt32* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Double);
+
+  define(new (alloc())
+             LTruncateDToInt32(useRegister(opd), LDefinition::BogusTemp()),
+         ins);
+}
+
+void LIRGeneratorMIPS::lowerTruncateFToInt32(MTruncateToInt32* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Float32);
+
+  define(new (alloc())
+             LTruncateFToInt32(useRegister(opd), LDefinition::BogusTemp()),
+         ins);
+}
+
+void LIRGeneratorMIPS::lowerDivI64(MDiv* div) {
+  if (div->isUnsigned()) {
+    lowerUDivI64(div);
+    return;
+  }
+
+  LDivOrModI64* lir = new (alloc()) LDivOrModI64(
+      useInt64RegisterAtStart(div->lhs()), useInt64RegisterAtStart(div->rhs()));
+
+  defineReturn(lir, div);
+}
+
+void LIRGeneratorMIPS::lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div) {
+  MOZ_CRASH("We don't use runtime div for this architecture");
+}
+
+void LIRGeneratorMIPS::lowerModI64(MMod* mod) {
+  if (mod->isUnsigned()) {
+    lowerUModI64(mod);
+    return;
+  }
+
+  LDivOrModI64* lir = new (alloc()) LDivOrModI64(
+      useInt64RegisterAtStart(mod->lhs()), useInt64RegisterAtStart(mod->rhs()));
+
+  defineReturn(lir, mod);
+}
+
+void LIRGeneratorMIPS::lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod) {
+  MOZ_CRASH("We don't use runtime mod for this architecture");
+}
+
+void LIRGeneratorMIPS::lowerUDivI64(MDiv* div) {
+  LUDivOrModI64* lir = new (alloc()) LUDivOrModI64(
+      useInt64RegisterAtStart(div->lhs()), useInt64RegisterAtStart(div->rhs()));
+  defineReturn(lir, div);
+}
+
+void LIRGeneratorMIPS::lowerUModI64(MMod* mod) {
+  LUDivOrModI64* lir = new (alloc()) LUDivOrModI64(
+      useInt64RegisterAtStart(mod->lhs()), useInt64RegisterAtStart(mod->rhs()));
+  defineReturn(lir, mod);
+}
+
+void LIRGeneratorMIPS::lowerBigIntDiv(MBigIntDiv* ins) {
+  auto* lir = new (alloc()) LBigIntDiv(useRegister(ins->lhs()),
+                                       useRegister(ins->rhs()), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorMIPS::lowerBigIntMod(MBigIntMod* ins) {
+  auto* lir = new (alloc()) LBigIntMod(useRegister(ins->lhs()),
+                                       useRegister(ins->rhs()), temp(), temp());
+  define(lir, ins);
+  assignSafepoint(lir, ins);
+}
+
+void LIRGenerator::visitWasmTruncateToInt64(MWasmTruncateToInt64* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Double || opd->type() == MIRType::Float32);
+
+  defineReturn(new (alloc()) LWasmTruncateToInt64(useRegisterAtStart(opd)),
+               ins);
+}
+
+void LIRGeneratorMIPS::lowerWasmBuiltinTruncateToInt64(
+    MWasmBuiltinTruncateToInt64* ins) {
+  MOZ_CRASH("We don't use it for this architecture");
+}
+
+void LIRGenerator::visitInt64ToFloatingPoint(MInt64ToFloatingPoint* ins) {
+  MDefinition* opd = ins->input();
+  MOZ_ASSERT(opd->type() == MIRType::Int64);
+  MOZ_ASSERT(IsFloatingPointType(ins->type()));
+
+  defineReturn(
+      new (alloc()) LInt64ToFloatingPoint(useInt64RegisterAtStart(opd)), ins);
+}
+
+void LIRGeneratorMIPS::lowerBuiltinInt64ToFloatingPoint(
+    MBuiltinInt64ToFloatingPoint* ins) {
+  MOZ_CRASH("We don't use it for this architecture");
+}