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Author SHA1 Message Date
Andrew Trick
e08c32249f LSR Fix: check SCEV expression safety before expansion. 
All SCEV expressions used by LSR formulae must be safe to
expand. i.e. they may not contain UDiv unless we can prove nonzero
denominator.

Fixes PR11356: LSR hoists UDiv.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160205 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-07-13 23:33:10 +00:00