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LibJS/JIT: Add fast path for RightShift
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1244e91481
commit
c956316c98
3 changed files with 55 additions and 1 deletions
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@ -800,6 +800,44 @@ void Compiler::compile_left_shift(Bytecode::Op::LeftShift const& op)
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end.link(m_assembler);
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}
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static Value cxx_right_shift(VM& vm, Value lhs, Value rhs)
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{
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return TRY_OR_SET_EXCEPTION(right_shift(vm, lhs, rhs));
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}
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void Compiler::compile_right_shift(Bytecode::Op::RightShift 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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branch_if_both_int32(ARG1, ARG2, [&] {
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// RCX = ARG2
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m_assembler.mov(
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Assembler::Operand::Register(Assembler::Reg::RCX),
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Assembler::Operand::Register(ARG2));
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// ARG1 >>= CL (32-bit)
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m_assembler.arithmetic_right_shift32(Assembler::Operand::Register(ARG1), {});
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// accumulator = ARG1 | SHIFTED_INT32_TAG;
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m_assembler.mov(
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Assembler::Operand::Register(GPR0),
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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(ARG1),
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Assembler::Operand::Register(GPR0));
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store_accumulator(ARG1);
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m_assembler.jump(end);
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});
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native_call((void*)cxx_right_shift);
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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 ThrowCompletionOr<Value> not_(VM&, Value value)
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{
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return Value(!value.to_boolean());
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