[llvm] r187965 - Remove AllUndef check from one of the loops in getVectorShuffle. It was already handled by the 'AllLHS && AllRHS' check after the previous loop.

[Craig Topper]

Author: ctopper
Date: Thu Aug  8 03:03:12 2013
New Revision: 187965

URL: http://llvm.org/viewvc/llvm-project?rev=187965&view=rev
Log:
Remove AllUndef check from one of the loops in getVectorShuffle. It was already handled by the 'AllLHS && AllRHS' check after the previous loop.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=187965&r1=187964&r2=187965&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Thu Aug  8 03:03:12 2013
@@ -1351,17 +1351,13 @@ SDValue SelectionDAG::getVectorShuffle(E
     commuteShuffle(N1, N2, MaskVec);
   }
 
-  // If Identity shuffle, or all shuffle in to undef, return that node.
-  bool AllUndef = true;
+  // If Identity shuffle return that node.
   bool Identity = true;
   for (unsigned i = 0; i != NElts; ++i) {
     if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
-    if (MaskVec[i] >= 0) AllUndef = false;
   }
   if (Identity && NElts == N1.getValueType().getVectorNumElements())
     return N1;
-  if (AllUndef)
-    return getUNDEF(VT);
 
   FoldingSetNodeID ID;
   SDValue Ops[2] = { N1, N2 };