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

[Anna Thomas via llvm-commits]

anna added a comment.

The current rule gets the lower byte in an LE machine. We could also add rules where we get the upper half of the load (would require a different pattern match in visitTrunc and pass in the offset to `FindAvailableLoadedValue`).


Repository:
  rL LLVM

http://reviews.llvm.org/D21246