[DAGCombiner] Slightly improve readability of matchRotateSub
authorAdam Nemet <anemet@apple.com>
Fri, 7 Mar 2014 23:56:24 +0000 (23:56 +0000)
committerAdam Nemet <anemet@apple.com>
Fri, 7 Mar 2014 23:56:24 +0000 (23:56 +0000)
commit622f350944ce4cba63f58754ef4f83d0c16f0338
tree958a4613557dbdbb1067bfdf21bb67ad9279a238
parentaa5b17b359fca123952666cd3cbff2c228042114
[DAGCombiner] Slightly improve readability of matchRotateSub

Slightly change the wording in the function comment. Originally, it can be
misunderstood as we turned the input into two subsequent rotates.

Better connect the comment which talks about Mask and the code which used
LoBits.  Renamed variable to MaskLoBits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203314 91177308-0d34-0410-b5e6-96231b3b80d8
lib/CodeGen/SelectionDAG/DAGCombiner.cpp