Max Kazantsev 437ee05885 [SCEV] Do not bother creating separate SCEVUnknown for unreachable nodes ...

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.

Differential Revision: https://reviews.llvm.org/D57567
Reviewed By: sanjoy

llvm-svn: 353017

2019-02-04 05:04:19 +00:00

473 KiB

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