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LibJS/Bytecode: Add fast path for LeftShift with Int32 operands

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This commit is contained in:
Andreas Kling 2024-03-04 10:01:40 +01:00
parent 8e04791480
commit a5e1e66abc
2 changed files with 16 additions and 2 deletions
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14
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -864,6 +864,20 @@ ThrowCompletionOr<void> RightShift::execute_impl(Bytecode::Interpreter& interpre
return {};
}
ThrowCompletionOr<void> LeftShift::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto const lhs = interpreter.get(m_lhs);
auto const rhs = interpreter.get(m_rhs);
if (lhs.is_int32() && rhs.is_int32() && rhs.as_i32() >= 0) {
auto const shift_count = static_cast<u32>(rhs.as_i32()) % 32;
interpreter.set(m_dst, Value(lhs.as_i32() << shift_count));
return {};
}
interpreter.set(m_dst, TRY(left_shift(vm, lhs, rhs)));
return {};
}
ThrowCompletionOr<void> LessThan::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();

4
Userland/Libraries/LibJS/Bytecode/Op.h
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@ -59,6 +59,7 @@ private:
O(BitwiseXor, bitwise_xor) \
O(GreaterThan, greater_than) \
O(GreaterThanEquals, greater_than_equals) \
O(LeftShift, left_shift) \
O(LessThan, less_than) \
O(LessThanEquals, less_than_equals) \
O(Mul, mul) \
@ -75,8 +76,7 @@ private:
O(LooselyInequals, loosely_inequals) \
O(LooselyEquals, loosely_equals) \
O(StrictlyInequals, strict_inequals) \
O(StrictlyEquals, strict_equals) \
O(LeftShift, left_shift)
O(StrictlyEquals, strict_equals)
#define JS_DECLARE_COMMON_BINARY_OP(OpTitleCase, op_snake_case) \
class OpTitleCase final : public Instruction { \