[PATCH] D124697: Distinguish between different forms of "address-taken" MachineBasicBlocks

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

The IR spec states that the value of `blockaddress` can only be used in an indirect branch/call, or in a comparison against null.  The latter seems to fall under the "address materialized somewhere" that you mention in the referenced review.  Is the motivation behind `BlockAddressTarget` to identify blocks that are targets of indirect branches?  Otherwise, it's not clear to me why `blockaddress(bb) == null` is any different from storing the address of `bb` in an exception table, for example.


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  https://reviews.llvm.org/D124697/new/

https://reviews.llvm.org/D124697