[PATCH] D111998: [ADT] Add APInt::isNegatedPowerOf2() helper

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, nikic, dmgreen.
Herald added subscribers: dexonsmith, ecnelises, hiraditya.
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Inspired by D111968 <https://reviews.llvm.org/D111968>, provide a isNegatedPowerOf2() wrapper instead of obfuscating code with (-Value).isPowerOf2() patterns, which I'm sure are likely avenues for typos.....

The actual implementation might be improved upon (iirc we're effectively looking for a shifted mask in the top bits).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111998

Files:
  llvm/include/llvm/ADT/APInt.h
  llvm/include/llvm/IR/PatternMatch.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  llvm/unittests/ADT/APIntTest.cpp

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