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diff --git a/js/src/jit/x64/Lowering-x64.cpp b/js/src/jit/x64/Lowering-x64.cpp
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+/* -*- 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/x64/Lowering-x64.h"
+
+#include "jit/Lowering.h"
+#include "jit/MIR.h"
+#include "jit/x64/Assembler-x64.h"
+
+#include "jit/shared/Lowering-shared-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+LBoxAllocation LIRGeneratorX64::useBoxFixed(MDefinition* mir, Register reg1,
+ Register, bool useAtStart) {
+ MOZ_ASSERT(mir->type() == MIRType::Value);
+
+ ensureDefined(mir);
+ return LBoxAllocation(LUse(reg1, mir->virtualRegister(), useAtStart));
+}
+
+LAllocation LIRGeneratorX64::useByteOpRegister(MDefinition* mir) {
+ return useRegister(mir);
+}
+
+LAllocation LIRGeneratorX64::useByteOpRegisterAtStart(MDefinition* mir) {
+ return useRegisterAtStart(mir);
+}
+
+LAllocation LIRGeneratorX64::useByteOpRegisterOrNonDoubleConstant(
+ MDefinition* mir) {
+ return useRegisterOrNonDoubleConstant(mir);
+}
+
+LDefinition LIRGeneratorX64::tempByteOpRegister() { return temp(); }
+
+LDefinition LIRGeneratorX64::tempToUnbox() { return temp(); }
+
+void LIRGeneratorX64::lowerForALUInt64(
+ LInstructionHelper<INT64_PIECES, INT64_PIECES, 0>* ins, MDefinition* mir,
+ MDefinition* input) {
+ ins->setInt64Operand(0, useInt64RegisterAtStart(input));
+ defineInt64ReuseInput(ins, mir, 0);
+}
+
+void LIRGeneratorX64::lowerForALUInt64(
+ LInstructionHelper<INT64_PIECES, 2 * INT64_PIECES, 0>* ins,
+ MDefinition* mir, MDefinition* lhs, MDefinition* rhs) {
+ ins->setInt64Operand(0, useInt64RegisterAtStart(lhs));
+ ins->setInt64Operand(INT64_PIECES, willHaveDifferentLIRNodes(lhs, rhs)
+ ? useInt64OrConstant(rhs)
+ : useInt64OrConstantAtStart(rhs));
+ defineInt64ReuseInput(ins, mir, 0);
+}
+
+void LIRGeneratorX64::lowerForMulInt64(LMulI64* ins, MMul* mir,
+ MDefinition* lhs, MDefinition* rhs) {
+ // X64 doesn't need a temp for 64bit multiplication.
+ ins->setInt64Operand(0, useInt64RegisterAtStart(lhs));
+ ins->setInt64Operand(INT64_PIECES, willHaveDifferentLIRNodes(lhs, rhs)
+ ? useInt64OrConstant(rhs)
+ : useInt64OrConstantAtStart(rhs));
+ defineInt64ReuseInput(ins, mir, 0);
+}
+
+void LIRGenerator::visitBox(MBox* box) {
+ MDefinition* opd = box->getOperand(0);
+
+ // If the operand is a constant, emit near its uses.
+ if (opd->isConstant() && box->canEmitAtUses()) {
+ emitAtUses(box);
+ return;
+ }
+
+ if (opd->isConstant()) {
+ define(new (alloc()) LValue(opd->toConstant()->toJSValue()), box,
+ LDefinition(LDefinition::BOX));
+ } else {
+ LBox* ins = new (alloc()) LBox(useRegister(opd), opd->type());
+ define(ins, box, LDefinition(LDefinition::BOX));
+ }
+}
+
+void LIRGenerator::visitUnbox(MUnbox* unbox) {
+ MDefinition* box = unbox->getOperand(0);
+ MOZ_ASSERT(box->type() == MIRType::Value);
+
+ LUnboxBase* lir;
+ if (IsFloatingPointType(unbox->type())) {
+ lir = new (alloc())
+ LUnboxFloatingPoint(useRegisterAtStart(box), unbox->type());
+ } else if (unbox->fallible()) {
+ // If the unbox is fallible, load the Value in a register first to
+ // avoid multiple loads.
+ lir = new (alloc()) LUnbox(useRegisterAtStart(box));
+ } else {
+ lir = new (alloc()) LUnbox(useAtStart(box));
+ }
+
+ if (unbox->fallible()) {
+ assignSnapshot(lir, unbox->bailoutKind());
+ }
+
+ define(lir, unbox);
+}
+
+void LIRGenerator::visitReturnImpl(MDefinition* opd, bool isGenerator) {
+ MOZ_ASSERT(opd->type() == MIRType::Value);
+
+ LReturn* ins = new (alloc()) LReturn(isGenerator);
+ ins->setOperand(0, useFixed(opd, JSReturnReg));
+ add(ins);
+}
+
+void LIRGeneratorX64::lowerUntypedPhiInput(MPhi* phi, uint32_t inputPosition,
+ LBlock* block, size_t lirIndex) {
+ lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
+}
+
+void LIRGeneratorX64::defineInt64Phi(MPhi* phi, size_t lirIndex) {
+ defineTypedPhi(phi, lirIndex);
+}
+
+void LIRGeneratorX64::lowerInt64PhiInput(MPhi* phi, uint32_t inputPosition,
+ LBlock* block, size_t lirIndex) {
+ lowerTypedPhiInput(phi, inputPosition, block, lirIndex);
+}
+
+void LIRGenerator::visitCompareExchangeTypedArrayElement(
+ MCompareExchangeTypedArrayElement* ins) {
+ MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+ MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+ if (Scalar::isBigIntType(ins->arrayType())) {
+ LUse elements = useRegister(ins->elements());
+ LAllocation index =
+ useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+ LUse oldval = useRegister(ins->oldval());
+ LUse newval = useRegister(ins->newval());
+ LInt64Definition temp1 = tempInt64Fixed(Register64(rax));
+ LInt64Definition temp2 = tempInt64();
+
+ auto* lir = new (alloc()) LCompareExchangeTypedArrayElement64(
+ elements, index, oldval, newval, temp1, temp2);
+ define(lir, ins);
+ assignSafepoint(lir, ins);
+ return;
+ }
+
+ lowerCompareExchangeTypedArrayElement(ins,
+ /* useI386ByteRegisters = */ false);
+}
+
+void LIRGenerator::visitAtomicExchangeTypedArrayElement(
+ MAtomicExchangeTypedArrayElement* ins) {
+ MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+ MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+ if (Scalar::isBigIntType(ins->arrayType())) {
+ LUse elements = useRegister(ins->elements());
+ LAllocation index =
+ useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+ LAllocation value = useRegister(ins->value());
+ LInt64Definition temp1 = tempInt64();
+ LDefinition temp2 = temp();
+
+ auto* lir = new (alloc()) LAtomicExchangeTypedArrayElement64(
+ elements, index, value, temp1, temp2);
+ define(lir, ins);
+ assignSafepoint(lir, ins);
+ return;
+ }
+
+ lowerAtomicExchangeTypedArrayElement(ins, /* useI386ByteRegisters = */ false);
+}
+
+void LIRGenerator::visitAtomicTypedArrayElementBinop(
+ MAtomicTypedArrayElementBinop* ins) {
+ MOZ_ASSERT(ins->elements()->type() == MIRType::Elements);
+ MOZ_ASSERT(ins->index()->type() == MIRType::IntPtr);
+
+ if (Scalar::isBigIntType(ins->arrayType())) {
+ LUse elements = useRegister(ins->elements());
+ LAllocation index =
+ useRegisterOrIndexConstant(ins->index(), ins->arrayType());
+ LAllocation value = useRegister(ins->value());
+
+ // Case 1: the result of the operation is not used.
+ //
+ // We can omit allocating the result BigInt.
+
+ if (ins->isForEffect()) {
+ LInt64Definition temp = tempInt64();
+
+ auto* lir = new (alloc()) LAtomicTypedArrayElementBinopForEffect64(
+ elements, index, value, temp);
+ add(lir, ins);
+ return;
+ }
+
+ // Case 2: the result of the operation is used.
+ //
+ // For ADD and SUB we'll use XADD.
+ //
+ // For AND/OR/XOR we need to use a CMPXCHG loop with rax as a temp register.
+
+ bool bitOp = !(ins->operation() == AtomicFetchAddOp ||
+ ins->operation() == AtomicFetchSubOp);
+
+ LInt64Definition temp1 = tempInt64();
+ LInt64Definition temp2;
+ if (bitOp) {
+ temp2 = tempInt64Fixed(Register64(rax));
+ } else {
+ temp2 = tempInt64();
+ }
+
+ auto* lir = new (alloc())
+ LAtomicTypedArrayElementBinop64(elements, index, value, temp1, temp2);
+ define(lir, ins);
+ assignSafepoint(lir, ins);
+ return;
+ }
+
+ lowerAtomicTypedArrayElementBinop(ins, /* useI386ByteRegisters = */ false);
+}
+
+void LIRGeneratorX64::lowerAtomicLoad64(MLoadUnboxedScalar* ins) {
+ const LUse elements = useRegister(ins->elements());
+ const LAllocation index =
+ useRegisterOrIndexConstant(ins->index(), ins->storageType());
+
+ auto* lir = new (alloc()) LAtomicLoad64(elements, index, temp(), tempInt64());
+ define(lir, ins);
+ assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorX64::lowerAtomicStore64(MStoreUnboxedScalar* ins) {
+ LUse elements = useRegister(ins->elements());
+ LAllocation index =
+ useRegisterOrIndexConstant(ins->index(), ins->writeType());
+ LAllocation value = useRegister(ins->value());
+
+ add(new (alloc()) LAtomicStore64(elements, index, value, tempInt64()), ins);
+}
+
+void LIRGenerator::visitWasmUnsignedToDouble(MWasmUnsignedToDouble* ins) {
+ MOZ_ASSERT(ins->input()->type() == MIRType::Int32);
+ LWasmUint32ToDouble* lir =
+ new (alloc()) LWasmUint32ToDouble(useRegisterAtStart(ins->input()));
+ define(lir, ins);
+}
+
+void LIRGenerator::visitWasmUnsignedToFloat32(MWasmUnsignedToFloat32* ins) {
+ MOZ_ASSERT(ins->input()->type() == MIRType::Int32);
+ LWasmUint32ToFloat32* lir =
+ new (alloc()) LWasmUint32ToFloat32(useRegisterAtStart(ins->input()));
+ define(lir, ins);
+}
+
+void LIRGenerator::visitWasmHeapBase(MWasmHeapBase* ins) {
+ auto* lir = new (alloc()) LWasmHeapBase(LAllocation());
+ define(lir, ins);
+}
+
+void LIRGenerator::visitWasmLoad(MWasmLoad* ins) {
+ MDefinition* base = ins->base();
+ // 'base' is a GPR but may be of either type. If it is 32-bit it is
+ // zero-extended and can act as 64-bit.
+ MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+ if (ins->type() != MIRType::Int64) {
+ auto* lir = new (alloc()) LWasmLoad(useRegisterOrZeroAtStart(base));
+ define(lir, ins);
+ return;
+ }
+
+ auto* lir = new (alloc()) LWasmLoadI64(useRegisterOrZeroAtStart(base));
+ defineInt64(lir, ins);
+}
+
+void LIRGenerator::visitWasmStore(MWasmStore* ins) {
+ MDefinition* base = ins->base();
+ // See comment in visitWasmLoad re the type of 'base'.
+ MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+ MDefinition* value = ins->value();
+ LAllocation valueAlloc;
+ switch (ins->access().type()) {
+ case Scalar::Int8:
+ case Scalar::Uint8:
+ case Scalar::Int16:
+ case Scalar::Uint16:
+ case Scalar::Int32:
+ case Scalar::Uint32:
+ valueAlloc = useRegisterOrConstantAtStart(value);
+ break;
+ case Scalar::Int64:
+ // No way to encode an int64-to-memory move on x64.
+ if (value->isConstant() && value->type() != MIRType::Int64) {
+ valueAlloc = useOrConstantAtStart(value);
+ } else {
+ valueAlloc = useRegisterAtStart(value);
+ }
+ break;
+ case Scalar::Float32:
+ case Scalar::Float64:
+ valueAlloc = useRegisterAtStart(value);
+ break;
+ case Scalar::Simd128:
+#ifdef ENABLE_WASM_SIMD
+ valueAlloc = useRegisterAtStart(value);
+ break;
+#else
+ MOZ_CRASH("unexpected array type");
+#endif
+ case Scalar::BigInt64:
+ case Scalar::BigUint64:
+ case Scalar::Uint8Clamped:
+ case Scalar::MaxTypedArrayViewType:
+ MOZ_CRASH("unexpected array type");
+ }
+
+ LAllocation baseAlloc = useRegisterOrZeroAtStart(base);
+ auto* lir = new (alloc()) LWasmStore(baseAlloc, valueAlloc);
+ add(lir, ins);
+}
+
+void LIRGenerator::visitWasmCompareExchangeHeap(MWasmCompareExchangeHeap* ins) {
+ MDefinition* base = ins->base();
+ // See comment in visitWasmLoad re the type of 'base'.
+ MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+ // The output may not be used but will be clobbered regardless, so
+ // pin the output to eax.
+ //
+ // The input values must both be in registers.
+
+ const LAllocation oldval = useRegister(ins->oldValue());
+ const LAllocation newval = useRegister(ins->newValue());
+
+ LWasmCompareExchangeHeap* lir =
+ new (alloc()) LWasmCompareExchangeHeap(useRegister(base), oldval, newval);
+
+ defineFixed(lir, ins, LAllocation(AnyRegister(eax)));
+}
+
+void LIRGenerator::visitWasmAtomicExchangeHeap(MWasmAtomicExchangeHeap* ins) {
+ // See comment in visitWasmLoad re the type of 'base'.
+ MOZ_ASSERT(ins->base()->type() == MIRType::Int32 ||
+ ins->base()->type() == MIRType::Int64);
+
+ const LAllocation base = useRegister(ins->base());
+ const LAllocation value = useRegister(ins->value());
+
+ // The output may not be used but will be clobbered regardless,
+ // so ignore the case where we're not using the value and just
+ // use the output register as a temp.
+
+ LWasmAtomicExchangeHeap* lir =
+ new (alloc()) LWasmAtomicExchangeHeap(base, value);
+ define(lir, ins);
+}
+
+void LIRGenerator::visitWasmAtomicBinopHeap(MWasmAtomicBinopHeap* ins) {
+ MDefinition* base = ins->base();
+ // See comment in visitWasmLoad re the type of 'base'.
+ MOZ_ASSERT(base->type() == MIRType::Int32 || base->type() == MIRType::Int64);
+
+ // No support for 64-bit operations with constants at the masm level.
+
+ bool canTakeConstant = ins->access().type() != Scalar::Int64;
+
+ // Case 1: the result of the operation is not used.
+ //
+ // We'll emit a single instruction: LOCK ADD, LOCK SUB, LOCK AND,
+ // LOCK OR, or LOCK XOR.
+
+ if (!ins->hasUses()) {
+ LAllocation value = canTakeConstant ? useRegisterOrConstant(ins->value())
+ : useRegister(ins->value());
+ LWasmAtomicBinopHeapForEffect* lir =
+ new (alloc()) LWasmAtomicBinopHeapForEffect(useRegister(base), value);
+ add(lir, ins);
+ return;
+ }
+
+ // Case 2: the result of the operation is used.
+ //
+ // For ADD and SUB we'll use XADD with word and byte ops as
+ // appropriate. Any output register can be used and if value is a
+ // register it's best if it's the same as output:
+ //
+ // movl value, output ; if value != output
+ // lock xaddl output, mem
+ //
+ // For AND/OR/XOR we need to use a CMPXCHG loop, and the output is
+ // always in rax:
+ //
+ // movl *mem, rax
+ // L: mov rax, temp
+ // andl value, temp
+ // lock cmpxchg temp, mem ; reads rax also
+ // jnz L
+ // ; result in rax
+ //
+ // Note the placement of L, cmpxchg will update rax with *mem if
+ // *mem does not have the expected value, so reloading it at the
+ // top of the loop would be redundant.
+
+ bool bitOp = !(ins->operation() == AtomicFetchAddOp ||
+ ins->operation() == AtomicFetchSubOp);
+ bool reuseInput = false;
+ LAllocation value;
+
+ if (bitOp || ins->value()->isConstant()) {
+ value = canTakeConstant ? useRegisterOrConstant(ins->value())
+ : useRegister(ins->value());
+ } else {
+ reuseInput = true;
+ value = useRegisterAtStart(ins->value());
+ }
+
+ auto* lir = new (alloc()) LWasmAtomicBinopHeap(
+ useRegister(base), value, bitOp ? temp() : LDefinition::BogusTemp());
+
+ if (reuseInput) {
+ defineReuseInput(lir, ins, LWasmAtomicBinopHeap::valueOp);
+ } else if (bitOp) {
+ defineFixed(lir, ins, LAllocation(AnyRegister(rax)));
+ } else {
+ define(lir, ins);
+ }
+}
+
+void LIRGenerator::visitSubstr(MSubstr* ins) {
+ LSubstr* lir = new (alloc())
+ LSubstr(useRegister(ins->string()), useRegister(ins->begin()),
+ useRegister(ins->length()), temp(), temp(), tempByteOpRegister());
+ define(lir, ins);
+ assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorX64::lowerDivI64(MDiv* div) {
+ if (div->isUnsigned()) {
+ lowerUDivI64(div);
+ return;
+ }
+
+ LDivOrModI64* lir = new (alloc()) LDivOrModI64(
+ useRegister(div->lhs()), useRegister(div->rhs()), tempFixed(rdx));
+ defineInt64Fixed(lir, div, LInt64Allocation(LAllocation(AnyRegister(rax))));
+}
+
+void LIRGeneratorX64::lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div) {
+ MOZ_CRASH("We don't use runtime div for this architecture");
+}
+
+void LIRGeneratorX64::lowerModI64(MMod* mod) {
+ if (mod->isUnsigned()) {
+ lowerUModI64(mod);
+ return;
+ }
+
+ LDivOrModI64* lir = new (alloc()) LDivOrModI64(
+ useRegister(mod->lhs()), useRegister(mod->rhs()), tempFixed(rax));
+ defineInt64Fixed(lir, mod, LInt64Allocation(LAllocation(AnyRegister(rdx))));
+}
+
+void LIRGeneratorX64::lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod) {
+ MOZ_CRASH("We don't use runtime mod for this architecture");
+}
+
+void LIRGeneratorX64::lowerUDivI64(MDiv* div) {
+ LUDivOrModI64* lir = new (alloc()) LUDivOrModI64(
+ useRegister(div->lhs()), useRegister(div->rhs()), tempFixed(rdx));
+ defineInt64Fixed(lir, div, LInt64Allocation(LAllocation(AnyRegister(rax))));
+}
+
+void LIRGeneratorX64::lowerUModI64(MMod* mod) {
+ LUDivOrModI64* lir = new (alloc()) LUDivOrModI64(
+ useRegister(mod->lhs()), useRegister(mod->rhs()), tempFixed(rax));
+ defineInt64Fixed(lir, mod, LInt64Allocation(LAllocation(AnyRegister(rdx))));
+}
+
+void LIRGeneratorX64::lowerBigIntDiv(MBigIntDiv* ins) {
+ auto* lir = new (alloc()) LBigIntDiv(
+ useRegister(ins->lhs()), useRegister(ins->rhs()), tempFixed(rax), temp());
+ defineFixed(lir, ins, LAllocation(AnyRegister(rdx)));
+ assignSafepoint(lir, ins);
+}
+
+void LIRGeneratorX64::lowerBigIntMod(MBigIntMod* ins) {
+ auto* lir = new (alloc()) LBigIntMod(
+ useRegister(ins->lhs()), useRegister(ins->rhs()), tempFixed(rax), temp());
+ defineFixed(lir, ins, LAllocation(AnyRegister(rdx)));
+ assignSafepoint(lir, ins);
+}
+
+void LIRGenerator::visitWasmTruncateToInt64(MWasmTruncateToInt64* ins) {
+ MDefinition* opd = ins->input();
+ MOZ_ASSERT(opd->type() == MIRType::Double || opd->type() == MIRType::Float32);
+
+ LDefinition maybeTemp =
+ ins->isUnsigned() ? tempDouble() : LDefinition::BogusTemp();
+ defineInt64(new (alloc()) LWasmTruncateToInt64(useRegister(opd), maybeTemp),
+ ins);
+}
+
+void LIRGeneratorX64::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()));
+
+ LDefinition maybeTemp = ins->isUnsigned() ? temp() : LDefinition::BogusTemp();
+ define(new (alloc()) LInt64ToFloatingPoint(useInt64Register(opd), maybeTemp),
+ ins);
+}
+
+void LIRGeneratorX64::lowerBuiltinInt64ToFloatingPoint(
+ MBuiltinInt64ToFloatingPoint* ins) {
+ MOZ_CRASH("We don't use it for this architecture");
+}
+
+void LIRGenerator::visitExtendInt32ToInt64(MExtendInt32ToInt64* ins) {
+ defineInt64(new (alloc()) LExtendInt32ToInt64(useAtStart(ins->input())), ins);
+}
+
+void LIRGenerator::visitSignExtendInt64(MSignExtendInt64* ins) {
+ defineInt64(new (alloc())
+ LSignExtendInt64(useInt64RegisterAtStart(ins->input())),
+ ins);
+}
+
+// On x64 we specialize the cases: compare is {U,}Int{32,64}, and select is
+// {U,}Int{32,64}, independently.
+bool LIRGeneratorShared::canSpecializeWasmCompareAndSelect(
+ MCompare::CompareType compTy, MIRType insTy) {
+ return (insTy == MIRType::Int32 || insTy == MIRType::Int64) &&
+ (compTy == MCompare::Compare_Int32 ||
+ compTy == MCompare::Compare_UInt32 ||
+ compTy == MCompare::Compare_Int64 ||
+ compTy == MCompare::Compare_UInt64);
+}
+
+void LIRGeneratorShared::lowerWasmCompareAndSelect(MWasmSelect* ins,
+ MDefinition* lhs,
+ MDefinition* rhs,
+ MCompare::CompareType compTy,
+ JSOp jsop) {
+ MOZ_ASSERT(canSpecializeWasmCompareAndSelect(compTy, ins->type()));
+ auto* lir = new (alloc()) LWasmCompareAndSelect(
+ useRegister(lhs), useAny(rhs), compTy, jsop,
+ useRegisterAtStart(ins->trueExpr()), useAny(ins->falseExpr()));
+ defineReuseInput(lir, ins, LWasmCompareAndSelect::IfTrueExprIndex);
+}
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