--- old/src/cpu/x86/vm/vm_version_x86.cpp	2013-05-14 08:14:49.000000000 -0400
+++ new/src/cpu/x86/vm/vm_version_x86.cpp	2013-05-14 08:14:49.000000000 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -446,6 +446,7 @@
                (supports_avx()    ? ", avx" : ""),
                (supports_avx2()   ? ", avx2" : ""),
                (supports_aes()    ? ", aes" : ""),
+               (supports_clmul()    ? ", clmul" : ""),
                (supports_erms()   ? ", erms" : ""),
                (supports_mmx_ext() ? ", mmxext" : ""),
                (supports_3dnow_prefetch() ? ", 3dnowpref" : ""),
@@ -489,6 +490,17 @@
     FLAG_SET_DEFAULT(UseAES, false);
   }
 
+  // Use CLMUL instructions if available.
+  if (supports_clmul()) {
+    if (FLAG_IS_DEFAULT(UseCLMUL)) {
+      UseCLMUL = true;
+    }
+  } else if (UseCLMUL) {
+    if (!FLAG_IS_DEFAULT(UseCLMUL))
+      warning("CLMUL instructions not available on this CPU (AVX may also be required)");
+    FLAG_SET_DEFAULT(UseCLMUL, false);
+  }
+
   // The AES intrinsic stubs require AES instruction support (of course)
   // but also require sse3 mode for instructions it use.
   if (UseAES && (UseSSE > 2)) {