https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86471
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Matt Bentley from comment #6)
> Suggested patch for libstdc++, std_algobase.h, line 688:
> template<typename _ForwardIterator, typename _Tp>
> inline typename
> __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
> __fill_a(_ForwardIterator __first, _ForwardIterator __last,
> const _Tp& __value)
> {
> if (__value != reinterpret_cast<_Tp>(0))
> {
> const _Tp __tmp = __value;
> for (; __first != __last; ++__first)
> *__first = __tmp;
> }
> else
> {
> if (const size_t __len = __last - __first)
> __builtin_memset(reinterpret_cast<void *>(__first), 0, __len *
> sizeof(_Tp));
> }
> }
>
> Comments?
This is incorrect for floating point types and non scalars. And it introduces
an extra check at runtime if value is not known to compile time.
