/* -*-c-*-
*
- * $Id: group-exp.c,v 1.1 2004/04/01 12:50:09 mdw Exp $
+ * $Id$
*
* Exponentiation for abstract groups
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: group-exp.c,v $
- * Revision 1.1 2004/04/01 12:50:09 mdw
- * Add cyclic group abstraction, with test code. Separate off exponentation
- * functions for better static linking. Fix a buttload of bugs on the way.
- * Generally ensure that negative exponents do inversion correctly. Add
- * table of standard prime-field subgroups. (Binary field subgroups are
- * currently unimplemented but easy to add if anyone ever finds a good one.)
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "group.h"
G_COPY(gg, d, gg->i);
if (n->f & MP_BURN)
G_BURN(gg, t);
- if (MP_LEN(n) == 0)
+ if (MP_ZEROP(n))
;
else {
- if (n->f & MP_NEG)
+ if (MP_NEGP(n))
G_INV(gg, t, t);
if (MP_LEN(n) < EXP_THRESH)
EXP_SIMPLE(d, t, n);
for (i = 0; i < n; i++) {
ff[i].base = G_CREATE(gg);
MP_SHRINK(f[i].exp);
- if (f[i].exp->f & MP_NEG)
+ if (MP_NEGP(f[i].exp))
G_INV(gg, ff[i].base, f[i].base);
else
G_COPY(gg, ff[i].base, f[i].base);