diff options
Diffstat (limited to 'js/src/jit/mips64/CodeGenerator-mips64.cpp')
| -rw-r--r-- | js/src/jit/mips64/CodeGenerator-mips64.cpp | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/js/src/jit/mips64/CodeGenerator-mips64.cpp b/js/src/jit/mips64/CodeGenerator-mips64.cpp new file mode 100644 index 0000000000..22e45663db --- /dev/null +++ b/js/src/jit/mips64/CodeGenerator-mips64.cpp @@ -0,0 +1,586 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "jit/mips64/CodeGenerator-mips64.h" + +#include "mozilla/MathAlgorithms.h" + +#include "jit/CodeGenerator.h" +#include "jit/MIR.h" +#include "jit/MIRGraph.h" +#include "js/Conversions.h" +#include "vm/Shape.h" + +#include "jit/MacroAssembler-inl.h" +#include "jit/shared/CodeGenerator-shared-inl.h" + +using namespace js; +using namespace js::jit; + +ValueOperand CodeGeneratorMIPS64::ToValue(LInstruction* ins, size_t pos) { + return ValueOperand(ToRegister(ins->getOperand(pos))); +} + +ValueOperand CodeGeneratorMIPS64::ToTempValue(LInstruction* ins, size_t pos) { + return ValueOperand(ToRegister(ins->getTemp(pos))); +} + +void CodeGenerator::visitBox(LBox* box) { + const LAllocation* in = box->getOperand(0); + ValueOperand result = ToOutValue(box); + + masm.moveValue(TypedOrValueRegister(box->type(), ToAnyRegister(in)), result); +} + +void CodeGenerator::visitUnbox(LUnbox* unbox) { + MUnbox* mir = unbox->mir(); + + Register result = ToRegister(unbox->output()); + + if (mir->fallible()) { + const ValueOperand value = ToValue(unbox, LUnbox::Input); + Label bail; + switch (mir->type()) { + case MIRType::Int32: + masm.fallibleUnboxInt32(value, result, &bail); + break; + case MIRType::Boolean: + masm.fallibleUnboxBoolean(value, result, &bail); + break; + case MIRType::Object: + masm.fallibleUnboxObject(value, result, &bail); + break; + case MIRType::String: + masm.fallibleUnboxString(value, result, &bail); + break; + case MIRType::Symbol: + masm.fallibleUnboxSymbol(value, result, &bail); + break; + case MIRType::BigInt: + masm.fallibleUnboxBigInt(value, result, &bail); + break; + default: + MOZ_CRASH("Given MIRType cannot be unboxed."); + } + bailoutFrom(&bail, unbox->snapshot()); + return; + } + + LAllocation* input = unbox->getOperand(LUnbox::Input); + if (input->isRegister()) { + Register inputReg = ToRegister(input); + switch (mir->type()) { + case MIRType::Int32: + masm.unboxInt32(inputReg, result); + break; + case MIRType::Boolean: + masm.unboxBoolean(inputReg, result); + break; + case MIRType::Object: + masm.unboxObject(inputReg, result); + break; + case MIRType::String: + masm.unboxString(inputReg, result); + break; + case MIRType::Symbol: + masm.unboxSymbol(inputReg, result); + break; + case MIRType::BigInt: + masm.unboxBigInt(inputReg, result); + break; + default: + MOZ_CRASH("Given MIRType cannot be unboxed."); + } + return; + } + + Address inputAddr = ToAddress(input); + switch (mir->type()) { + case MIRType::Int32: + masm.unboxInt32(inputAddr, result); + break; + case MIRType::Boolean: + masm.unboxBoolean(inputAddr, result); + break; + case MIRType::Object: + masm.unboxObject(inputAddr, result); + break; + case MIRType::String: + masm.unboxString(inputAddr, result); + break; + case MIRType::Symbol: + masm.unboxSymbol(inputAddr, result); + break; + case MIRType::BigInt: + masm.unboxBigInt(inputAddr, result); + break; + default: + MOZ_CRASH("Given MIRType cannot be unboxed."); + } +} + +void CodeGeneratorMIPS64::splitTagForTest(const ValueOperand& value, + ScratchTagScope& tag) { + masm.splitTag(value.valueReg(), tag); +} + +void CodeGenerator::visitCompareI64(LCompareI64* lir) { + MCompare* mir = lir->mir(); + MOZ_ASSERT(mir->compareType() == MCompare::Compare_Int64 || + mir->compareType() == MCompare::Compare_UInt64); + + const LInt64Allocation lhs = lir->getInt64Operand(LCompareI64::Lhs); + const LInt64Allocation rhs = lir->getInt64Operand(LCompareI64::Rhs); + Register lhsReg = ToRegister64(lhs).reg; + Register output = ToRegister(lir->output()); + Register rhsReg; + ScratchRegisterScope scratch(masm); + + if (IsConstant(rhs)) { + rhsReg = scratch; + masm.ma_li(rhsReg, ImmWord(ToInt64(rhs))); + } else if (rhs.value().isGeneralReg()) { + rhsReg = ToRegister64(rhs).reg; + } else { + rhsReg = scratch; + masm.loadPtr(ToAddress(rhs.value()), rhsReg); + } + + bool isSigned = mir->compareType() == MCompare::Compare_Int64; + masm.cmpPtrSet(JSOpToCondition(lir->jsop(), isSigned), lhsReg, rhsReg, + output); +} + +void CodeGenerator::visitCompareI64AndBranch(LCompareI64AndBranch* lir) { + MCompare* mir = lir->cmpMir(); + MOZ_ASSERT(mir->compareType() == MCompare::Compare_Int64 || + mir->compareType() == MCompare::Compare_UInt64); + + const LInt64Allocation lhs = lir->getInt64Operand(LCompareI64::Lhs); + const LInt64Allocation rhs = lir->getInt64Operand(LCompareI64::Rhs); + Register lhsReg = ToRegister64(lhs).reg; + Register rhsReg; + ScratchRegisterScope scratch(masm); + + if (IsConstant(rhs)) { + rhsReg = scratch; + masm.ma_li(rhsReg, ImmWord(ToInt64(rhs))); + } else if (rhs.value().isGeneralReg()) { + rhsReg = ToRegister64(rhs).reg; + } else { + rhsReg = scratch; + masm.loadPtr(ToAddress(rhs.value()), rhsReg); + } + + bool isSigned = mir->compareType() == MCompare::Compare_Int64; + Assembler::Condition cond = JSOpToCondition(lir->jsop(), isSigned); + emitBranch(lhsReg, rhsReg, cond, lir->ifTrue(), lir->ifFalse()); +} + +void CodeGenerator::visitDivOrModI64(LDivOrModI64* lir) { + Register lhs = ToRegister(lir->lhs()); + Register rhs = ToRegister(lir->rhs()); + Register output = ToRegister(lir->output()); + + Label done; + + // Handle divide by zero. + if (lir->canBeDivideByZero()) { + Label nonZero; + masm.ma_b(rhs, rhs, &nonZero, Assembler::NonZero); + masm.wasmTrap(wasm::Trap::IntegerDivideByZero, lir->bytecodeOffset()); + masm.bind(&nonZero); + } + + // Handle an integer overflow exception from INT64_MIN / -1. + if (lir->canBeNegativeOverflow()) { + Label notOverflow; + masm.branchPtr(Assembler::NotEqual, lhs, ImmWord(INT64_MIN), ¬Overflow); + masm.branchPtr(Assembler::NotEqual, rhs, ImmWord(-1), ¬Overflow); + if (lir->mir()->isMod()) { + masm.ma_xor(output, output); + } else { + masm.wasmTrap(wasm::Trap::IntegerOverflow, lir->bytecodeOffset()); + } + masm.jump(&done); + masm.bind(¬Overflow); + } + +#ifdef MIPSR6 + if (lir->mir()->isMod()) { + masm.as_dmod(output, lhs, rhs); + } else { + masm.as_ddiv(output, lhs, rhs); + } +#else + masm.as_ddiv(lhs, rhs); + if (lir->mir()->isMod()) { + masm.as_mfhi(output); + } else { + masm.as_mflo(output); + } +#endif + masm.bind(&done); +} + +void CodeGenerator::visitUDivOrModI64(LUDivOrModI64* lir) { + Register lhs = ToRegister(lir->lhs()); + Register rhs = ToRegister(lir->rhs()); + Register output = ToRegister(lir->output()); + + Label done; + + // Prevent divide by zero. + if (lir->canBeDivideByZero()) { + Label nonZero; + masm.ma_b(rhs, rhs, &nonZero, Assembler::NonZero); + masm.wasmTrap(wasm::Trap::IntegerDivideByZero, lir->bytecodeOffset()); + masm.bind(&nonZero); + } + +#ifdef MIPSR6 + if (lir->mir()->isMod()) { + masm.as_dmodu(output, lhs, rhs); + } else { + masm.as_ddivu(output, lhs, rhs); + } +#else + masm.as_ddivu(lhs, rhs); + if (lir->mir()->isMod()) { + masm.as_mfhi(output); + } else { + masm.as_mflo(output); + } +#endif + masm.bind(&done); +} + +void CodeGeneratorMIPS64::emitBigIntDiv(LBigIntDiv* ins, Register dividend, + Register divisor, Register output, + Label* fail) { + // Callers handle division by zero and integer overflow. + +#ifdef MIPSR6 + masm.as_ddiv(/* result= */ dividend, dividend, divisor); +#else + masm.as_ddiv(dividend, divisor); + masm.as_mflo(dividend); +#endif + + // Create and return the result. + masm.newGCBigInt(output, divisor, initialBigIntHeap(), fail); + masm.initializeBigInt(output, dividend); +} + +void CodeGeneratorMIPS64::emitBigIntMod(LBigIntMod* ins, Register dividend, + Register divisor, Register output, + Label* fail) { + // Callers handle division by zero and integer overflow. + +#ifdef MIPSR6 + masm.as_dmod(/* result= */ dividend, dividend, divisor); +#else + masm.as_ddiv(dividend, divisor); + masm.as_mfhi(dividend); +#endif + + // Create and return the result. + masm.newGCBigInt(output, divisor, initialBigIntHeap(), fail); + masm.initializeBigInt(output, dividend); +} + +template <typename T> +void CodeGeneratorMIPS64::emitWasmLoadI64(T* lir) { + const MWasmLoad* mir = lir->mir(); + + Register ptrScratch = InvalidReg; + if (!lir->ptrCopy()->isBogusTemp()) { + ptrScratch = ToRegister(lir->ptrCopy()); + } + + Register ptrReg = ToRegister(lir->ptr()); + if (mir->base()->type() == MIRType::Int32) { + // See comment in visitWasmLoad re the type of 'base'. + masm.move32ZeroExtendToPtr(ptrReg, ptrReg); + } + + if (IsUnaligned(mir->access())) { + masm.wasmUnalignedLoadI64(mir->access(), HeapReg, ptrReg, ptrScratch, + ToOutRegister64(lir), + ToRegister(lir->getTemp(1))); + } else { + masm.wasmLoadI64(mir->access(), HeapReg, ptrReg, ptrScratch, + ToOutRegister64(lir)); + } +} + +void CodeGenerator::visitWasmLoadI64(LWasmLoadI64* lir) { + emitWasmLoadI64(lir); +} + +void CodeGenerator::visitWasmUnalignedLoadI64(LWasmUnalignedLoadI64* lir) { + emitWasmLoadI64(lir); +} + +template <typename T> +void CodeGeneratorMIPS64::emitWasmStoreI64(T* lir) { + const MWasmStore* mir = lir->mir(); + + Register ptrScratch = InvalidReg; + if (!lir->ptrCopy()->isBogusTemp()) { + ptrScratch = ToRegister(lir->ptrCopy()); + } + + Register ptrReg = ToRegister(lir->ptr()); + if (mir->base()->type() == MIRType::Int32) { + // See comment in visitWasmLoad re the type of 'base'. + masm.move32ZeroExtendToPtr(ptrReg, ptrReg); + } + + if (IsUnaligned(mir->access())) { + masm.wasmUnalignedStoreI64(mir->access(), ToRegister64(lir->value()), + HeapReg, ptrReg, ptrScratch, + ToRegister(lir->getTemp(1))); + } else { + masm.wasmStoreI64(mir->access(), ToRegister64(lir->value()), HeapReg, + ptrReg, ptrScratch); + } +} + +void CodeGenerator::visitWasmStoreI64(LWasmStoreI64* lir) { + emitWasmStoreI64(lir); +} + +void CodeGenerator::visitWasmUnalignedStoreI64(LWasmUnalignedStoreI64* lir) { + emitWasmStoreI64(lir); +} + +void CodeGenerator::visitWasmSelectI64(LWasmSelectI64* lir) { + MOZ_ASSERT(lir->mir()->type() == MIRType::Int64); + + Register cond = ToRegister(lir->condExpr()); + const LInt64Allocation falseExpr = lir->falseExpr(); + + Register64 out = ToOutRegister64(lir); + MOZ_ASSERT(ToRegister64(lir->trueExpr()) == out, + "true expr is reused for input"); + + if (falseExpr.value().isRegister()) { + masm.as_movz(out.reg, ToRegister(falseExpr.value()), cond); + } else { + Label done; + masm.ma_b(cond, cond, &done, Assembler::NonZero, ShortJump); + masm.loadPtr(ToAddress(falseExpr.value()), out.reg); + masm.bind(&done); + } +} + +void CodeGenerator::visitWasmReinterpretFromI64(LWasmReinterpretFromI64* lir) { + MOZ_ASSERT(lir->mir()->type() == MIRType::Double); + MOZ_ASSERT(lir->mir()->input()->type() == MIRType::Int64); + masm.as_dmtc1(ToRegister(lir->input()), ToFloatRegister(lir->output())); +} + +void CodeGenerator::visitWasmReinterpretToI64(LWasmReinterpretToI64* lir) { + MOZ_ASSERT(lir->mir()->type() == MIRType::Int64); + MOZ_ASSERT(lir->mir()->input()->type() == MIRType::Double); + masm.as_dmfc1(ToRegister(lir->output()), ToFloatRegister(lir->input())); +} + +void CodeGenerator::visitExtendInt32ToInt64(LExtendInt32ToInt64* lir) { + const LAllocation* input = lir->getOperand(0); + Register output = ToRegister(lir->output()); + + if (lir->mir()->isUnsigned()) { + masm.ma_dext(output, ToRegister(input), Imm32(0), Imm32(32)); + } else { + masm.ma_sll(output, ToRegister(input), Imm32(0)); + } +} + +void CodeGenerator::visitWrapInt64ToInt32(LWrapInt64ToInt32* lir) { + const LAllocation* input = lir->getOperand(0); + Register output = ToRegister(lir->output()); + + if (lir->mir()->bottomHalf()) { + if (input->isMemory()) { + masm.load32(ToAddress(input), output); + } else { + masm.ma_sll(output, ToRegister(input), Imm32(0)); + } + } else { + MOZ_CRASH("Not implemented."); + } +} + +void CodeGenerator::visitSignExtendInt64(LSignExtendInt64* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + Register64 output = ToOutRegister64(lir); + switch (lir->mode()) { + case MSignExtendInt64::Byte: + masm.move32To64SignExtend(input.reg, output); + masm.move8SignExtend(output.reg, output.reg); + break; + case MSignExtendInt64::Half: + masm.move32To64SignExtend(input.reg, output); + masm.move16SignExtend(output.reg, output.reg); + break; + case MSignExtendInt64::Word: + masm.move32To64SignExtend(input.reg, output); + break; + } +} + +void CodeGenerator::visitWasmExtendU32Index(LWasmExtendU32Index* lir) { + Register input = ToRegister(lir->input()); + Register output = ToRegister(lir->output()); + MOZ_ASSERT(input == output); + masm.move32To64ZeroExtend(input, Register64(output)); +} + +void CodeGenerator::visitWasmWrapU32Index(LWasmWrapU32Index* lir) { + Register input = ToRegister(lir->input()); + Register output = ToRegister(lir->output()); + MOZ_ASSERT(input == output); + masm.move64To32(Register64(input), output); +} + +void CodeGenerator::visitClzI64(LClzI64* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + Register64 output = ToOutRegister64(lir); + masm.clz64(input, output.reg); +} + +void CodeGenerator::visitCtzI64(LCtzI64* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + Register64 output = ToOutRegister64(lir); + masm.ctz64(input, output.reg); +} + +void CodeGenerator::visitNotI64(LNotI64* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + Register output = ToRegister(lir->output()); + + masm.ma_cmp_set(output, input.reg, zero, Assembler::Equal); +} + +void CodeGenerator::visitBitNotI64(LBitNotI64* ins) { + const LAllocation* input = ins->getOperand(0); + MOZ_ASSERT(!input->isConstant()); + Register inputReg = ToRegister(input); + MOZ_ASSERT(inputReg == ToRegister(ins->output())); + masm.ma_not(inputReg, inputReg); +} + +void CodeGenerator::visitWasmTruncateToInt64(LWasmTruncateToInt64* lir) { + FloatRegister input = ToFloatRegister(lir->input()); + Register64 output = ToOutRegister64(lir); + + MWasmTruncateToInt64* mir = lir->mir(); + MIRType fromType = mir->input()->type(); + + MOZ_ASSERT(fromType == MIRType::Double || fromType == MIRType::Float32); + + auto* ool = new (alloc()) OutOfLineWasmTruncateCheck(mir, input, output); + addOutOfLineCode(ool, mir); + + Label* oolEntry = ool->entry(); + Label* oolRejoin = ool->rejoin(); + bool isSaturating = mir->isSaturating(); + + if (fromType == MIRType::Double) { + if (mir->isUnsigned()) { + masm.wasmTruncateDoubleToUInt64(input, output, isSaturating, oolEntry, + oolRejoin, InvalidFloatReg); + } else { + masm.wasmTruncateDoubleToInt64(input, output, isSaturating, oolEntry, + oolRejoin, InvalidFloatReg); + } + } else { + if (mir->isUnsigned()) { + masm.wasmTruncateFloat32ToUInt64(input, output, isSaturating, oolEntry, + oolRejoin, InvalidFloatReg); + } else { + masm.wasmTruncateFloat32ToInt64(input, output, isSaturating, oolEntry, + oolRejoin, InvalidFloatReg); + } + } +} + +void CodeGenerator::visitInt64ToFloatingPoint(LInt64ToFloatingPoint* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + FloatRegister output = ToFloatRegister(lir->output()); + + MIRType outputType = lir->mir()->type(); + MOZ_ASSERT(outputType == MIRType::Double || outputType == MIRType::Float32); + + if (outputType == MIRType::Double) { + if (lir->mir()->isUnsigned()) { + masm.convertUInt64ToDouble(input, output, Register::Invalid()); + } else { + masm.convertInt64ToDouble(input, output); + } + } else { + if (lir->mir()->isUnsigned()) { + masm.convertUInt64ToFloat32(input, output, Register::Invalid()); + } else { + masm.convertInt64ToFloat32(input, output); + } + } +} + +void CodeGenerator::visitTestI64AndBranch(LTestI64AndBranch* lir) { + Register64 input = ToRegister64(lir->getInt64Operand(0)); + MBasicBlock* ifTrue = lir->ifTrue(); + MBasicBlock* ifFalse = lir->ifFalse(); + + emitBranch(input.reg, Imm32(0), Assembler::NonZero, ifTrue, ifFalse); +} + +void CodeGenerator::visitAtomicLoad64(LAtomicLoad64* lir) { + Register elements = ToRegister(lir->elements()); + Register temp = ToRegister(lir->temp()); + Register64 temp64 = ToRegister64(lir->temp64()); + Register out = ToRegister(lir->output()); + const MLoadUnboxedScalar* mir = lir->mir(); + + Scalar::Type storageType = mir->storageType(); + + auto sync = Synchronization::Load(); + masm.memoryBarrierBefore(sync); + if (lir->index()->isConstant()) { + Address source = + ToAddress(elements, lir->index(), storageType, mir->offsetAdjustment()); + masm.load64(source, temp64); + } else { + BaseIndex source(elements, ToRegister(lir->index()), + ScaleFromScalarType(storageType), mir->offsetAdjustment()); + masm.load64(source, temp64); + } + masm.memoryBarrierAfter(sync); + emitCreateBigInt(lir, storageType, temp64, out, temp); +} + +void CodeGenerator::visitAtomicStore64(LAtomicStore64* lir) { + Register elements = ToRegister(lir->elements()); + Register value = ToRegister(lir->value()); + Register64 temp1 = ToRegister64(lir->temp1()); + + Scalar::Type writeType = lir->mir()->writeType(); + + masm.loadBigInt64(value, temp1); + auto sync = Synchronization::Store(); + masm.memoryBarrierBefore(sync); + if (lir->index()->isConstant()) { + Address dest = ToAddress(elements, lir->index(), writeType); + masm.store64(temp1, dest); + } else { + BaseIndex dest(elements, ToRegister(lir->index()), + ScaleFromScalarType(writeType)); + masm.store64(temp1, dest); + } + masm.memoryBarrierAfter(sync); +} |