Nikita Popov 9145562b48 [SimplifyIndVar] Simplify non-overflowing saturating add/sub ...

If we can detect that saturating math that depends on an IV cannot
overflow, replace it with simple math. This is similar to the CVP
optimization from D62703, just based on a different underlying
analysis (SCEV vs LVI) that catches different cases.

Differential Revision: https://reviews.llvm.org/D62792

llvm-svn: 363489

2019-06-15 08:48:52 +00:00

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