It wasn't happy about this either

llvm-svn: 21133
diff --git a/llvm/lib/Target/Alpha/AlphaISelPattern.cpp b/llvm/lib/Target/Alpha/AlphaISelPattern.cpp
index 6c3a87a..5df40ca 100644
--- a/llvm/lib/Target/Alpha/AlphaISelPattern.cpp
+++ b/llvm/lib/Target/Alpha/AlphaISelPattern.cpp
@@ -1755,7 +1755,7 @@
           BuildMI(BB, Alpha::S4ADDQ, 2, Result).addReg(Tmp2).addReg(Tmp1);
         }
       }
-      else if(N.getOperand(0).getOpcode() == ISD::SHL && isAdd &&
+      else if(N.getOperand(1).getOpcode() == ISD::SHL && isAdd &&
          N.getOperand(1).getOperand(1).getOpcode() == ISD::Constant &&
          cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getValue() == 3)
       {