[PATCH] D11518: [DAGCombiner] Convert constant AND masks to shuffle clear masks down to the byte level

[Simon Pilgrim]

RKSimon added a comment.

Chandler - would you be happy for this patch to be submitted? I've started looking at the remaining issues (shuffle through bitcasts, extension + masks and merging 2x128 bitops -> 1x256 mask), all of them are more easily exposed after this patch and I'm working on improvements right now.


Repository:
  rL LLVM

http://reviews.llvm.org/D11518