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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();