Nate Chandler 70cfa6a05c [IRGen] Check for nil in final class cast opt. ...

As an optimization, there is a fast-cast to non-final classes that just
compares isa pointers.  If the source of the cast is an Optional<class>,
though, it's not allowed to "directly compare the isa-pointer"; because
the source might be Optional.none, i.e. null.

Add a check for nil when emitting the fast class cast.

rdar://108614878

2023-05-03 18:39:08 -07:00

42 KiB

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