[PATCH] D21246: [InstCombine] Add rule to fold away trunc of partial load

[Anna Thomas via llvm-commits]

anna updated this revision to Diff 61669.
anna marked 3 inline comments as done.
anna added a comment.

Added check in `visitTrunc` to confirm the load is non-volatile (volatile loads have target dependent results, and I'm not sure if it will affect any targets) and if the load is `atomic`, it has only a single use, which is the trunc. 
Added a test case to verify trunc is not removed in the case of atomic load with more than one use.


http://reviews.llvm.org/D21246

Files:
  include/llvm/Analysis/Loads.h
  lib/Analysis/Loads.cpp
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  test/Transforms/InstCombine/trunc.ll

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