[PATCH] D51751: Merge clang's isRepeatedBytePattern with LLVM's isBytewiseValue

[JF Bastien via Phabricator via llvm-commits]

jfb updated this revision to Diff 164485.
jfb added a comment.

- Augment isBytewiseValue to be as powerful as clang's version. Update code that used it to handle undef merging. This captures more memcpy patterns and can generate memcpy of undef (which selection DAG later gets rid of).


Repository:
  rL LLVM

https://reviews.llvm.org/D51751

Files:
  include/llvm/Analysis/ValueTracking.h
  include/llvm/Transforms/Scalar/MemCpyOptimizer.h
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  test/Transforms/MemCpyOpt/fca2memcpy.ll

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