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[libc++] Also provide an alignment assumption for vector in C++03 mode (#124839)

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There's no reason not to, and it's easy enough to do using enable_if. As
a drive-by change, also add a missing _LIBCPP_NO_CFI attribute on
__add_alignment_assumption.
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Louis Dionne 2025-02-05 08:57:22 -05:00 committed by GitHub
parent 8c36665267
commit ccb08b9dab
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1 changed files with 11 additions and 7 deletions
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18
libcxx/include/__vector/vector.h
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@ -783,14 +783,18 @@ private:
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __move_assign_alloc(vector&, false_type) _NOEXCEPT {}
static _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pointer __add_alignment_assumption(pointer __p) _NOEXCEPT {
#ifndef _LIBCPP_CXX03_LANG
if constexpr (is_pointer<pointer>::value) {
if (!__libcpp_is_constant_evaluated()) {
return static_cast<pointer>(__builtin_assume_aligned(__p, alignof(decltype(*__p))));
}
template <class _Ptr = pointer, __enable_if_t<is_pointer<_Ptr>::value, int> = 0>
static _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI pointer
__add_alignment_assumption(_Ptr __p) _NOEXCEPT {
if (!__libcpp_is_constant_evaluated()) {
return static_cast<pointer>(__builtin_assume_aligned(__p, _LIBCPP_ALIGNOF(decltype(*__p))));
}
#endif
return __p;
}
template <class _Ptr = pointer, __enable_if_t<!is_pointer<_Ptr>::value, int> = 0>
static _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI pointer
__add_alignment_assumption(_Ptr __p) _NOEXCEPT {
return __p;
}
};