[Bug middle-end/86471] GCC/libstdc++ outputs inferior code for std::fill and std::fill_n vs std::memset on c-style arrays

[mattreecebentley at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86471

--- Comment #19 from Matt Bentley <mattreecebentley at gmail dot com> ---
(In reply to Jonathan Wakely from comment #18)
> (In reply to Matt Bentley from comment #13)
> > Well it's more that you're doing- at any rate, the issue you've noted is
> > easily bypassed by changing the "reinterpret_cast<void *>(__first)" to
> > "reinterpret_cast<void *>(&*(__first))".
> 
> Also, independent of the non-contiguous problem, using reinterpret_cast here
> is unnecessary (any non-const pointer can be implicitly converted to void*)
> and would prevent adding constexpr to the algorithm (as required for C++2a).

It is to prevent compiler warnings under clang.