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LibJS/JIT: Add fast path for Add Int32, Int32
This uses the 32-bit registers to perform the addition and bail if the overflow flag (OF) is set.
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4b23a7dfb4
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3 changed files with 74 additions and 1 deletions
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@ -503,6 +503,49 @@ static ThrowCompletionOr<Value> typed_equals(VM&, Value src1, Value src2)
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JS_ENUMERATE_COMMON_BINARY_OPS_WITHOUT_FAST_PATH(DO_COMPILE_COMMON_BINARY_OP)
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# undef DO_COMPILE_COMMON_BINARY_OP
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static Value cxx_add(VM& vm, Value lhs, Value rhs)
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{
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return TRY_OR_SET_EXCEPTION(add(vm, lhs, rhs));
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}
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void Compiler::compile_add(Bytecode::Op::Add const& op)
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{
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load_vm_register(ARG1, op.lhs());
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load_vm_register(ARG2, Bytecode::Register::accumulator());
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Assembler::Label end {};
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Assembler::Label slow_case {};
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branch_if_both_int32(ARG1, ARG2, [&] {
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// GPR0 = ARG1 + ARG2 (32-bit)
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m_assembler.mov(
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Assembler::Operand::Register(GPR0),
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Assembler::Operand::Register(ARG1));
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m_assembler.add32(
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Assembler::Operand::Register(GPR0),
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Assembler::Operand::Register(ARG2));
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// if (overflow) goto slow_case;
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m_assembler.jump_if_overflow(slow_case);
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// accumulator = GPR0 | SHIFTED_INT32_TAG;
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m_assembler.mov(
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Assembler::Operand::Register(GPR1),
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Assembler::Operand::Imm(SHIFTED_INT32_TAG));
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m_assembler.bitwise_or(
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Assembler::Operand::Register(GPR0),
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Assembler::Operand::Register(GPR1));
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store_vm_register(Bytecode::Register::accumulator(), GPR0);
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m_assembler.jump(end);
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});
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slow_case.link(m_assembler);
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native_call((void*)cxx_add);
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store_vm_register(Bytecode::Register::accumulator(), RET);
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check_exception();
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end.link(m_assembler);
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}
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static Value cxx_less_than(VM& vm, Value lhs, Value rhs)
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{
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return TRY_OR_SET_EXCEPTION(less_than(vm, lhs, rhs));
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@ -1257,6 +1300,9 @@ OwnPtr<NativeExecutable> Compiler::compile(Bytecode::Executable& bytecode_execut
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case Bytecode::Instruction::Type::SetVariable:
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compiler.compile_set_variable(static_cast<Bytecode::Op::SetVariable const&>(op));
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break;
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case Bytecode::Instruction::Type::Add:
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compiler.compile_add(static_cast<Bytecode::Op::Add const&>(op));
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break;
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case Bytecode::Instruction::Type::LessThan:
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compiler.compile_less_than(static_cast<Bytecode::Op::LessThan const&>(op));
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break;
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