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Commit 87716c93 authored by Andrew Trick's avatar Andrew Trick
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Added isValidRewrite() to check the result of ScalarEvolutionExpander. 

SCEV may generate expressions composed of multiple pointers, which can
lead to invalid GEP expansion. Until we can teach SCEV to follow strict
pointer rules, make sure no bad GEPs creep into IR.
Fixes rdar://problem/9038671.

llvm-svn: 127839
parent 4c753376
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