Set an operation expansion, noticed while running 
llc over test/CodeGen/Generic with -march=alpha.

llvm-svn: 76154
diff --git a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
index 9097a8a..92bfa91 100644
--- a/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/llvm/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -64,6 +64,8 @@
   setLoadExtAction(ISD::SEXTLOAD, MVT::i8,  Expand);
   setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
 
+  setTruncStoreAction(MVT::f64, MVT::f32, Expand);
+
   //  setOperationAction(ISD::BRIND,        MVT::Other,   Expand);
   setOperationAction(ISD::BR_JT,        MVT::Other, Expand);
   setOperationAction(ISD::BR_CC,        MVT::Other, Expand);