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LibJS: Avoid calling generic Instruction::length() during dispatch

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Since we know the exact type, we can avoid calling the generic lookup
function that branches on instruction type.
This commit is contained in:
Andreas Kling 2025-04-03 11:12:35 +02:00
parent bc0ec84100
commit 4e53c62aa6
2 changed files with 9 additions and 1 deletions
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2
Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -386,7 +386,7 @@ FLATTEN_ON_CLANG void Interpreter::run_bytecode(size_t entry_point)
#define DISPATCH_NEXT(name) \
do { \
if constexpr (Op::name::IsVariableLength) \
program_counter += instruction.length(); \
program_counter += static_cast<Op::name const&>(instruction).length(); \
else \
program_counter += sizeof(Op::name); \
auto& next_instruction = *reinterpret_cast<Instruction const*>(&bytecode[program_counter]); \

8
Libraries/LibJS/Bytecode/Op.h
View file

@ -313,6 +313,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_excluded_names_count);
}
size_t length() const { return length_impl(); }
Operand dst() const { return m_dst; }
Operand from_object() const { return m_from_object; }
@ -362,6 +363,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_element_count);
}
size_t length() const { return length_impl(); }
size_t element_count() const { return m_element_count; }
@ -388,6 +390,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Value) * m_element_count);
}
size_t length() const { return length_impl(); }
void execute_impl(Bytecode::Interpreter&) const;
ByteString to_byte_string_impl(Bytecode::Executable const&) const;
@ -1816,6 +1819,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_argument_count);
}
size_t length() const { return length_impl(); }
Operand dst() const { return m_dst; }
Operand callee() const { return m_callee; }
@ -1865,6 +1869,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_argument_count);
}
size_t length() const { return length_impl(); }
Operand dst() const { return m_dst; }
Operand callee() const { return m_callee; }
@ -1916,6 +1921,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_argument_count);
}
size_t length() const { return length_impl(); }
Operand dst() const { return m_dst; }
Operand callee() const { return m_callee; }
@ -1964,6 +1970,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Operand) * m_argument_count);
}
size_t length() const { return length_impl(); }
Operand dst() const { return m_dst; }
Operand callee() const { return m_callee; }
@ -2081,6 +2088,7 @@ public:
{
return round_up_to_power_of_two(alignof(void*), sizeof(*this) + sizeof(Optional<Operand>) * m_element_keys_count);
}
size_t length() const { return length_impl(); }
ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
ByteString to_byte_string_impl(Bytecode::Executable const&) const;