[PATCH] D108992: [KnownBits] Add support for X+X and X*X self-addition/multiplication

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 369890.
RKSimon added a comment.

Clean up the selfadd cases to just perform a shl-by-one.

InstCombine does canonicalize X+X to X<<1, but we have cases in DAG where this is reversed - such as the cases being addressed in PR50468/D108139 <https://reviews.llvm.org/D108139> etc.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D108992/new/

https://reviews.llvm.org/D108992

Files:
  llvm/include/llvm/Support/KnownBits.h
  llvm/lib/Support/KnownBits.cpp
  llvm/unittests/Support/KnownBitsTest.cpp

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