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[MemorySSA] Make MemoryLocation unknown when phi translation cannot be performed.

Authored by asbirlea on May 4 2020, 6:54 PM.



When phi translation cannot be performed, be conservative and make the MemoryLocation unknown.

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asbirlea created this revision.May 4 2020, 6:54 PM
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george.burgess.iv accepted this revision.May 5 2020, 9:12 AM

lgtm with one nit. thanks!


AIUI, generally we try to treat MemoryLocations and LocationSizes as immutable. so we can keep with that, do you think Location = Location.getWithNewSize(LocationSize::unknown()); (and reverting the changes to MemoryLocation.h) is an acceptable alternative?

This revision is now accepted and ready to land.May 5 2020, 9:12 AM
asbirlea updated this revision to Diff 262191.May 5 2020, 12:41 PM

Address comment.
Thank you for the review!

asbirlea marked an inline comment as done.May 5 2020, 12:41 PM
This revision was automatically updated to reflect the committed changes.