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LibJS/JIT: Add fast path for LeftShift
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@ -566,6 +566,23 @@ struct X86_64Assembler {
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}
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}
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void shift_left32(Operand dest, Optional<Operand> count)
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{
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VERIFY(dest.type == Operand::Type::Reg);
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if (count.has_value()) {
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VERIFY(count->type == Operand::Type::Imm);
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VERIFY(count->fits_in_u8());
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emit_rex_for_slash(dest, REX_W::No);
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emit8(0xc1);
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emit_modrm_slash(4, dest);
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emit8(count->offset_or_immediate);
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} else {
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emit_rex_for_slash(dest, REX_W::No);
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emit8(0xd3);
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emit_modrm_slash(4, dest);
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}
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}
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void enter()
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{
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push(Operand::Register(Reg::RBP));
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@ -762,6 +762,44 @@ void Compiler::compile_bitwise_xor(Bytecode::Op::BitwiseXor const& op)
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end.link(m_assembler);
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}
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static Value cxx_left_shift(VM& vm, Value lhs, Value rhs)
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{
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return TRY_OR_SET_EXCEPTION(left_shift(vm, lhs, rhs));
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}
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void Compiler::compile_left_shift(Bytecode::Op::LeftShift 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.shift_left32(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_left_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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@ -53,7 +53,6 @@ private:
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O(LooselyEquals, abstract_equals) \
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O(StrictlyInequals, typed_inequals) \
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O(StrictlyEquals, typed_equals) \
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O(LeftShift, left_shift) \
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O(RightShift, right_shift) \
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O(UnsignedRightShift, unsigned_right_shift)
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