Max Kazantsev 87f4a3de45 [SCEV][NFC] Introduce isSafeToExpandAt function to SCEVExpander ...

This function checks that:
1) It is safe to expand a SCEV;
2) It is OK to materialize it at the specified location.
For example, attempt to expand a loop's AddRec to the same loop's preheader should fail.

Differential Revision: https://reviews.llvm.org/D39236

llvm-svn: 318377

2017-11-16 05:10:56 +00:00

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