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Author SHA1 Message Date
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
Dan Gohman 69451a0950 Avoid analyzing instructions in blocks not reachable from the entry block. 
They are lots of trouble, and they don't matter. This fixes PR6559.

llvm-svn: 98103
 2010-03-09 23:46:50 +00:00