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LibJS/Bytecode: Turn JumpIf condition,@a,@next into JumpTrue/JumpFalse

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If one of the jump targets is the very next block, we can convert the
jump instruction into a smaller JumpTrue or JumpFalse.
This commit is contained in:
Andreas Kling 2024-05-06 10:15:17 +02:00
commit fae1527a18
Notes: sideshowbarker 2024-07-17 23:00:03 +09:00
4 changed files with 120 additions and 0 deletions
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52
Userland/Libraries/LibJS/Bytecode/Op.h
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@ -1110,6 +1110,58 @@ private:
Label m_false_target;
};
class JumpTrue final : public Instruction {
public:
constexpr static bool IsTerminator = true;
explicit JumpTrue(Operand condition, Label target)
: Instruction(Type::JumpTrue, sizeof(*this))
, m_condition(condition)
, m_target(target)
{
}
ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
ByteString to_byte_string_impl(Bytecode::Executable const&) const;
void visit_labels_impl(Function<void(Label&)> visitor)
{
visitor(m_target);
}
Operand condition() const { return m_condition; }
auto& target() const { return m_target; }
private:
Operand m_condition;
Label m_target;
};
class JumpFalse final : public Instruction {
public:
constexpr static bool IsTerminator = true;
explicit JumpFalse(Operand condition, Label target)
: Instruction(Type::JumpFalse, sizeof(*this))
, m_condition(condition)
, m_target(target)
{
}
ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
ByteString to_byte_string_impl(Bytecode::Executable const&) const;
void visit_labels_impl(Function<void(Label&)> visitor)
{
visitor(m_target);
}
Operand condition() const { return m_condition; }
auto& target() const { return m_target; }
private:
Operand m_condition;
Label m_target;
};
class JumpNullish final : public Instruction {
public:
constexpr static bool IsTerminator = true;