[PATCH] D149414: [ValueTracking] Add logic for `isKnownNonZero(sadd.sat X, Y)`

[Nikita Popov via Phabricator via llvm-commits]

nikic added inline comments.


================
Comment at: llvm/lib/Analysis/ValueTracking.cpp:2940
+                            II->getArgOperand(0), II->getArgOperand(1),
+                            /*NSW*/ false);
       case Intrinsic::uadd_sat:
----------------
I think you can set NSW=true here, based on the following reasoning: If the addition were to overflow, then the result would be either SignedMin or SignedMax, neither of which is zero. As such, we can ignore overflow cases.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D149414/new/

https://reviews.llvm.org/D149414