[llvm] r309277 - [SelectionDAG] Tidyup mask creation. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Thu Jul 27 08:08:53 2017
New Revision: 309277

URL: http://llvm.org/viewvc/llvm-project?rev=309277&view=rev
Log:
[SelectionDAG] Tidyup mask creation. NFCI.

Assign all concat elements to UNDEF and then just replace the first element, instead of copying everything individually.

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

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp?rev=309277&r1=309276&r2=309277&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp Thu Jul 27 08:08:53 2017
@@ -3021,12 +3021,9 @@ SDValue DAGTypeLegalizer::convertMask(SD
   } else if (CurrMaskNumEls < ToMaskVT.getVectorNumElements()) {
     unsigned NumSubVecs = (ToMaskVT.getVectorNumElements() / CurrMaskNumEls);
     EVT SubVT = Mask->getValueType(0);
-    SmallVector<SDValue, 16> SubConcatOps(NumSubVecs);
-    SubConcatOps[0] = Mask;
-    for (unsigned i = 1; i < NumSubVecs; ++i)
-      SubConcatOps[i] = DAG.getUNDEF(SubVT);
-    Mask =
-        DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(Mask), ToMaskVT, SubConcatOps);
+    SmallVector<SDValue, 16> SubOps(NumSubVecs, DAG.getUNDEF(SubVT));
+    SubOps[0] = Mask;
+    Mask = DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(Mask), ToMaskVT, SubOps);
   }
 
   assert((Mask->getValueType(0) == ToMaskVT) &&