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2 Commits

Author SHA1 Message Date
Adam Nemet
b033b03c23 Update comment from r203315 based on review 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203361 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-03-08 21:51:55 +00:00
Adam Nemet
316d3e3085 [DAGCombiner] Recognize another rotation idiom 
This is the new idiom:

  x<<(y&31) | x>>((0-y)&31)

which is recognized as:

  x ROTL (y&31)

The change refines matchRotateSub.  In
Neg & (OpSize - 1) == (OpSize - Pos) & (OpSize - 1), if Pos is
Pos' & (OpSize - 1) we can just use Pos' instead of Pos.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203315 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-03-07 23:56:28 +00:00