Michael Gottesman 6c5c853339 [ownership] Change guaranteed args from transformation terminators to not require end_borrows. ...

For those who are unaware, a transformation terminator is a terminator like
switch_enum/checked_cast_br that always dominate their successor blocks. Since
they dominate their successor blocks by design and transform their input into
the args form, we can validate that they obey guaranteed ownership semantics
just like a forwarding instruction.

Beyond removing unnecessary code bloat, this also makes it significantly more
easier to optimize/work with transformation terminators when converting @owned
-> @guaranteed since we do not need to find end_borrow points when the owned
value is consumed.

<rdar://problem/59097063>

2020-02-02 16:59:57 -08:00

24 KiB

Raw Blame History

View Raw