fix 2006-11-01-vastart.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31371 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaISelLowering.cpp b/lib/Target/Alpha/AlphaISelLowering.cpp
index 7bf2693..0b8961e 100644
--- a/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -565,7 +565,7 @@
   case ISD::VASTART: {
     SDOperand Chain = Op.getOperand(0);
     SDOperand VAListP = Op.getOperand(1);
-    SrcValueSDNode *VAListS = cast<SrcValueSDNode>(Op.getOperand(3));
+    SrcValueSDNode *VAListS = cast<SrcValueSDNode>(Op.getOperand(2));
     
     // vastart stores the address of the VarArgsBase and VarArgsOffset
     SDOperand FR  = DAG.getFrameIndex(VarArgsBase, MVT::i64);