[PATCH] D87974: [Builtin] Add __builtin_zero_non_value_bits.

[Billy Robert O'Neal III via Phabricator via cfe-commits]

BillyONeal added a comment.

> Are they actually the same, with the same handling of corner cases like unions and tail padding?
> There's more to this than just the name, and if they aren't the same, it seems better to have two names.

They are both implementing the same C++ feature, with the same desired semantics of zeroing out any bits in the object representation that aren't in the value representation. If they differ, one or the other would have a bug.

> Is there a specification for __builtin_zero_non_value_bits available somewhere?

I don't know if there is a formal spec for it beyond the actual C++ standard.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87974/new/

https://reviews.llvm.org/D87974