[llvm] r324243 - [Hexagon] Don't use garbage mask in HvxSelector::shuffp2

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Mon Feb  5 07:46:41 2018
New Revision: 324243

URL: http://llvm.org/viewvc/llvm-project?rev=324243&view=rev
Log:
[Hexagon] Don't use garbage mask in HvxSelector::shuffp2

The function shuffp2 was breaking up a wide shuffle into a pair of
narrower ones, except that the narrower shuffle masks were actually
uninitialized.

Modified:
    llvm/trunk/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp

Modified: llvm/trunk/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp?rev=324243&r1=324242&r2=324243&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp (original)
+++ llvm/trunk/lib/Target/Hexagon/HexagonISelDAGToDAGHVX.cpp Mon Feb  5 07:46:41 2018
@@ -1271,6 +1271,8 @@ OpRef HvxSelector::shuffp2(ShuffleMask S
     return shuffp1(ShuffleMask(PackedMask), P, Results);
 
   SmallVector<int,256> MaskL(VecLen), MaskR(VecLen);
+  splitMask(SM.Mask, MaskL, MaskR);
+
   OpRef L = shuffp1(ShuffleMask(MaskL), Va, Results);
   OpRef R = shuffp1(ShuffleMask(MaskR), Vb, Results);
   if (!L.isValid() || !R.isValid())