Philip Reames d24a0e8857 [SCEV] Use constant range of RHS to prove NUW on narrow IV in trip count logic ...

The basic idea here is that given a zero extended narrow IV, we can prove the inner IV to be NUW if we can prove there's a value the inner IV must take before overflow which must exit the loop.

Differential Revision: https://reviews.llvm.org/D109457

2021-11-05 15:36:47 -07:00

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