3 Commits

Author	SHA1	Message	Date
Josh Stone	33036159a4	ci: add a runner for vanilla LLVM 16 ... Like #107044, this will let us track compatibility with LLVM 16 going forward, especially after we eventually upgrade our own to the next. This also drops `tidy` here and in `x86_64-gnu-llvm-15`, syncing with that change in #106085.	2023-04-16 11:50:20 -07:00
Scott McMurray	f6a57c1955	Move Option::as_slice to an always-sound implementation ... This approach depends on CSE to not have any branches or selects when the guessed offset is correct -- which it always will be right now -- but to also be *sound* (just less efficient) if the layout algorithms change such that the guess is incorrect.	2023-03-11 20:29:26 -08:00
Andre Bogus	41da875fae	Add Option::as_slice(_mut) ... This adds the following functions: * `Option<T>::as_slice(&self) -> &[T]` * `Option<T>::as_slice_mut(&mut self) -> &[T]` The `as_slice` and `as_slice_mut` functions benefit from an optimization that makes them completely branch-free. Note that the optimization's soundness hinges on the fact that either the niche optimization makes the offset of the `Some(_)` contents zero or the mempory layout of `Option<T>` is equal to that of `Option<MaybeUninit<T>>`.	2023-03-01 00:05:31 +01:00