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Max Kazantsev a15cdde064 [SCEV] Limited support for unsigned preds in isImpliedViaOperations
The logic there only considers `SLT/SGT` predicates. We can use the same logic
for proving `ULT/UGT` predicates if all involved values are non-negative.

Adding full-scale support for unsigned might be challenging because of code amount,
so we can consider this in the future.

Differential Revision: https://reviews.llvm.org/D88087
Reviewed By: reames
2020-10-02 10:20:57 +07:00
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