[PATCH] D149418: [ValueTracking] Add additional cases for `isKnownNonZero(mul X, Y)`

[Nikita Popov via Phabricator via llvm-commits]

nikic added inline comments.


================
Comment at: llvm/lib/Analysis/ValueTracking.cpp:2884
+
     break;
   }
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Similar to the add case, we should compute mul known bits here based on the already computed XKnown/YKnown, rather than computing them again via the fallback.

I think just using KnownBits::mul should be enough, as the NSW case handled by computeKnownBitsMul is already handled better above.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149418/new/

https://reviews.llvm.org/D149418