--- old/src/cpu/x86/vm/vm_version_x86.cpp	Fri Jul 13 20:36:15 2012
+++ new/src/cpu/x86/vm/vm_version_x86.cpp	Fri Jul 13 20:36:15 2012
@@ -562,7 +562,7 @@
         AllocatePrefetchInstr = 3;
       }
       // On family 15h processors use XMM and UnalignedLoadStores for Array Copy
-      if( FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
+      if( supports_sse2() && FLAG_IS_DEFAULT(UseXMMForArrayCopy) ) {
         UseXMMForArrayCopy = true;
       }
       if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {