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[SCEV] Do not bother creating separate SCEVUnknown for unreachable nodes

Authored by mkazantsev on Jan 31 2019, 11:22 PM.



Currently, SCEV creates SCEVUnknown for every node of unreachable code. If we
have a huge amounts of such code, we will be littering SE with these nodes. We could
just state that they all are undef and save some memory.

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mkazantsev created this revision.Jan 31 2019, 11:22 PM
sanjoy accepted this revision.Feb 1 2019, 9:04 PM

This is fine, but IMO mapping them to undef feels cleaner conceptually.

This revision is now accepted and ready to land.Feb 1 2019, 9:04 PM

Makes sense, undef works fine, too.

mkazantsev updated this revision to Diff 184989.Feb 3 2019, 8:59 PM
mkazantsev edited the summary of this revision. (Show Details)

Remade to undef.

This revision was automatically updated to reflect the committed changes.
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