[PATCH] Handle some cases of mismatched types in IRCE

[Sanjoy Das]

> This sounds like a bug in indvars. Is it obvious how to fix it there?


I think this is intentional -- `IndVarSimplify` has code to deal with this when verifying that the loop-backedge counts have not changed:

https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Scalar/IndVarSimplify.cpp#L2026


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http://reviews.llvm.org/D7082

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