Fix crash with an insertvalue that produces an empty object.

llvm-svn: 218171

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -3307,6 +3307,12 @@ void SelectionDAGBuilder::visitInsertValue(const InsertValueInst &I) {
   unsigned NumValValues = ValValueVTs.size();
   SmallVector<SDValue, 4> Values(NumAggValues);
 
+  // Ignore an insertvalue that produces an empty object
+  if (!NumAggValues) {
+    setValue(&I, DAG.getUNDEF(MVT(MVT::Other)));
+    return;
+  }
+
   SDValue Agg = getValue(Op0);
   unsigned i = 0;
   // Copy the beginning value(s) from the original aggregate.

llvm/test/CodeGen/Generic/empty-insertvalue.ll

@@ -0,0 +1,7 @@
+; RUN: llc < %s
+
+define void @f() {
+entry:
+  %0 = insertvalue { [0 x { i8*, i8* }], [0 x { i8*, i64 }] } undef, [0 x { i8*, i8* }] undef, 0
+  ret void
+}