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LibJS+LibJIT: Add fast path for Int32 * Int32
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0aeb83b03f
commit
24fb009cf5
3 changed files with 64 additions and 1 deletions
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@ -578,6 +578,48 @@ void Compiler::compile_sub(Bytecode::Op::Sub const& op)
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end.link(m_assembler);
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}
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static Value cxx_mul(VM& vm, Value lhs, Value rhs)
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{
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return TRY_OR_SET_EXCEPTION(mul(vm, lhs, rhs));
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}
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void Compiler::compile_mul(Bytecode::Op::Mul const& op)
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{
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load_vm_register(ARG1, op.lhs());
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load_accumulator(ARG2);
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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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// if (overflow) goto slow_case;
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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.mul32(
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Assembler::Operand::Register(GPR0),
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Assembler::Operand::Register(ARG2),
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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_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_mul);
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store_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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