src/cpu/x86/vm/vm_version_x86_64.cpp

*** 322,333 ****
--- 322,336 ----
        }
        if( supports_sse4_2() && supports_ht() ) { // Newest Intel cpus
          if( FLAG_IS_DEFAULT(UseUnalignedLoadStores) && UseXMMForArrayCopy ) {
            UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
          }
+         if(FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
+             UseSSE42Intrinsics = true;
          }
        }
+     }
    }
  
    assert(0 <= ReadPrefetchInstr && ReadPrefetchInstr <= 3, "invalid value");
    assert(0 <= AllocatePrefetchInstr && AllocatePrefetchInstr <= 3, "invalid value");