From 975726345cb4914152fd7d07d92d41dcfd921503 Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Sat, 20 Sep 2014 00:10:47 +0000
Subject: [PATCH] Fix crash with an insertvalue that produces an empty object.

llvm-svn: 218171
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 6 ++++++
 llvm/test/CodeGen/Generic/empty-insertvalue.ll        | 7 +++++++
 2 files changed, 13 insertions(+)
 create mode 100644 llvm/test/CodeGen/Generic/empty-insertvalue.ll

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 6d302f98f55f..6a8cd2eb3b16 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/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.
diff --git a/llvm/test/CodeGen/Generic/empty-insertvalue.ll b/llvm/test/CodeGen/Generic/empty-insertvalue.ll
new file mode 100644
index 000000000000..e4cc27c2ffcf
--- /dev/null
+++ b/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
+}