Fix a bug in DAGCombine for the optimization of BUILD_VECTOR. We cant generate a shuffle node from two vectors of different types.
llvm-svn: 150383
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 9fa5572..f51e721 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -7385,9 +7385,13 @@
// If VecIn2 is unused then change it to undef.
VecIn2 = VecIn2.getNode() ? VecIn2 : DAG.getUNDEF(VT);
+ // Check that we were able to transform all incoming values to the same type.
+ if (VecIn2.getValueType() != VecIn1.getValueType() ||
+ VecIn1.getValueType() != VT)
+ return SDValue();
+
// Only type-legal BUILD_VECTOR nodes are converted to shuffle nodes.
- if (!isTypeLegal(VT) || !isTypeLegal(VecIn1.getValueType()) ||
- !isTypeLegal(VecIn2.getValueType()))
+ if (!isTypeLegal(VT))
return SDValue();
// Return the new VECTOR_SHUFFLE node.