[X86][AVX] Ensure resolveTargetShuffleInputs shuffle masks are the correct width

Don't handle ZERO_EXTEND style shuffles until we support bitcasts. Found by inspection.

llvm-svn: 343924

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index e113dbc..6ea5ee1 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -6393,7 +6393,8 @@ static bool getFauxShuffleMask(SDValue N, SmallVectorImpl<int> &Mask,
       return false;
     SmallVector<int, 64> SubMask;
     SmallVector<SDValue, 2> SubInputs;
-    if (!resolveTargetShuffleInputs(Sub, SubInputs, SubMask, DAG))
+    if (!resolveTargetShuffleInputs(Sub, SubInputs, SubMask, DAG) ||
+        SubMask.size() != NumSubElts)
       return false;
     Ops.push_back(Src);
     for (SDValue &SubInput : SubInputs) {