This implements two kinds of optimizations. Specifically
- `char_traits<char8_t>` uses `char` code paths; these are heavily
optimized and the operations are equivalent
- `char16_t` and `char32_t` `find` uses `std::find` to forward to
`wmemchr` if they have the same size
As reported in https://reviews.llvm.org/D151953#4472195, the std::move
algorithm (and various other functions that relied on it) stopped working
after starting to use `__constexpr_memmove` in its implementation. This
patch fixes the underlying issue in `__constexpr_memmove` and adds tests
for various related algorithms and functions that were not exercising
trivial move-only types.
Differential Revision: https://reviews.llvm.org/D154613
This makes it less ambiguous what the parameter is meant to get.
Reviewed By: #libc, ldionne
Spies: ldionne, libcxx-commits
Differential Revision: https://reviews.llvm.org/D152040
