+# March 2011.
+#
+# Support for hardware KIMD-GHASH is verified to produce correct
+# result and therefore is engaged. On z196 it was measured to process
+# 8KB buffer ~7 faster than software implementation. It's not as
+# impressive for smaller buffer sizes and for smallest 16-bytes buffer
+# it's actually almost 2 times slower. Which is the reason why
+# KIMD-GHASH is not used in gcm_gmult_4bit.
+