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AK: Use compiler builtins for MakeIntegerSequence
/TypeListElement
These recursive templates have a measurable impact on the compile speed of Variant-heavy code like LibWeb. Using these builtins leads to a 2.5% speedup for the measured compilation units.
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1a10e904b5
Notes:
sideshowbarker
2024-07-17 06:40:35 +09:00
Author: https://github.com/BertalanD Commit: https://github.com/SerenityOS/serenity/commit/1a10e904b5 Pull-request: https://github.com/SerenityOS/serenity/pull/19663
@ -454,6 +454,13 @@ struct IntegerSequence {
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template<unsigned... Indices>
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using IndexSequence = IntegerSequence<unsigned, Indices...>;
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#if __has_builtin(__make_integer_seq)
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template<typename T, T N>
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using MakeIntegerSequence = __make_integer_seq<IntegerSequence, T, N>;
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#elif __has_builtin(__integer_pack)
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template<typename T, T N>
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using MakeIntegerSequence = IntegerSequence<T, __integer_pack(N)...>;
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#else
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template<typename T, T N, T... Ts>
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auto make_integer_sequence_impl()
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{
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@ -465,6 +472,7 @@ auto make_integer_sequence_impl()
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template<typename T, T N>
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using MakeIntegerSequence = decltype(make_integer_sequence_impl<T, N>());
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#endif
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template<unsigned N>
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using MakeIndexSequence = MakeIntegerSequence<unsigned, N>;
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@ -16,6 +16,12 @@ struct TypeList;
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template<unsigned Index, typename List>
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struct TypeListElement;
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#if __has_builtin(__type_pack_element)
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template<unsigned Index, typename... Types>
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struct TypeListElement<Index, TypeList<Types...>> {
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using Type = __type_pack_element<Index, Types...>;
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};
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#else
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template<unsigned Index, typename Head, typename... Tail>
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struct TypeListElement<Index, TypeList<Head, Tail...>>
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: TypeListElement<Index - 1, TypeList<Tail...>> {
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@ -25,6 +31,7 @@ template<typename Head, typename... Tail>
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struct TypeListElement<0, TypeList<Head, Tail...>> {
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using Type = Head;
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};
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#endif
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template<typename... Types>
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struct TypeList {
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