commit 742db6874a10b7bd3eaade2e865ef12ed357e74e
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 f9ec063bcfad928bf9f7e2d6fba217596bffc5f4
parent b355db7877176696fa7e57269b44e26a312fc623

Fix PR4975. Avoid referencing empty vector.

llvm-svn: 99840

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index faefe29..7a0daf6 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/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