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Author SHA1 Message Date
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
Nikita Popov eb37509832 [IndVarSimplify] Add tests for saturating math on IV; NFC 
These saturating math ops can be replaced with simple math.

llvm-svn: 362320
 2019-06-02 08:49:35 +00:00