[PATCH] D150100: [KnownBits] Improve implementation of `KnownBits::abs`

[Noah Goldstein via Phabricator via llvm-commits]

goldstein.w.n updated this revision to Diff 522365.
goldstein.w.n added a comment.

Fill in the rest of the special cases + only use neg


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D150100/new/

https://reviews.llvm.org/D150100

Files:
  llvm/lib/Support/KnownBits.cpp
  llvm/test/Analysis/ValueTracking/knownbits-abs.ll
  llvm/unittests/Support/KnownBitsTest.cpp

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