diff -r 6113864ecd70 -r 4e71ed4c2709 hotspot/src/cpu/x86/vm/vm_version_x86.cpp
--- a/hotspot/src/cpu/x86/vm/vm_version_x86.cpp	Tue Mar 31 10:02:01 2009 -0700
+++ b/hotspot/src/cpu/x86/vm/vm_version_x86.cpp	Tue Mar 31 14:07:08 2009 -0700
@@ -408,6 +408,11 @@
           UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
         }
       }
+      if( supports_sse4_2() && UseSSE >= 4 ) {
+        if( FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
+          UseSSE42Intrinsics = true;
+        }
+      }
     }
   }