+ * Revision 1.6 2000/10/08 15:48:35 mdw
+ * Rename Karatsuba constants now that we have @gfx_kmul@ too.
+ *
+ * Revision 1.5 2000/10/08 12:11:01 mdw
+ * Use @mpx_ueq@ instead of @MPX_UCMP@.
+ *
+ * Revision 1.4 2000/07/29 17:04:02 mdw
+ * Remove useless header `mpscan.h'.
+ *
+ * Revision 1.3 2000/06/17 11:42:54 mdw
+ * Moved the Karatsuba macros into a separate file for better sharing.
+ * Fixed some comments. Use an improved technique so that all the
+ * operations are squarings.
+ *
+ * Revision 1.2 1999/12/13 15:35:01 mdw
+ * Simplify and improve.
+ *