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* [SCEV] Do not bother creating separate SCEVUnknown for unreachable nodesMax Kazantsev2019-02-041-1/+1
| | | | | | | | | | | 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
* Avoid analyzing instructions in blocks not reachable from the entry block.Dan Gohman2010-03-091-0/+13
They are lots of trouble, and they don't matter. This fixes PR6559. llvm-svn: 98103
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