Richard Smith 96beffba15 [constexpr] Support for constant evaluation of __builtin_memcpy and ...

__builtin_memmove (in non-type-punning cases).

This is intended to permit libc++ to make std::copy etc constexpr
without sacrificing the optimization that uses memcpy on
trivially-copyable types.

__builtin_strcpy and __builtin_wcscpy are not handled by this change.
They'd be straightforward to add, but we haven't encountered a need for
them just yet.

llvm-svn: 338455

2018-07-31 23:35:09 +00:00

22 KiB

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