commit 8e36a5c960e07555d80fb98d71c692c20f3ea6c4
author Evan Cheng <evan.cheng@apple.com> Mon Mar 29 21:27:30 2010 +0000
committer Evan Cheng <evan.cheng@apple.com> Mon Mar 29 21:27:30 2010 +0000
tree a4c70e9af0e9c469f84ef71fc3e0de99d67cb60a
parent 0ea86bc411748f10b913f42ef3a71b46ace7ceb2

Fix PR4975. Avoid referencing empty vector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99840 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index faefe29..7a0daf6 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6051,8 +6051,10 @@
     }
 
     if (!I->use_empty()) {
-      SDValue Res = DAG.getMergeValues(&ArgValues[0], NumValues,
-                                       SDB->getCurDebugLoc());
+      SDValue Res;
+      if (!ArgValues.empty())
+        Res = DAG.getMergeValues(&ArgValues[0], NumValues,
+                                 SDB->getCurDebugLoc());
       SDB->setValue(I, Res);
 
       // If this argument is live outside of the entry block, insert a copy from