/* -*-c-*-
*
- * $Id: mp-arith.c,v 1.16 2003/05/16 09:09:24 mdw Exp $
+ * $Id: mp-arith.c,v 1.18 2004/04/08 01:36:15 mdw Exp $
*
* Basic arithmetic on multiprecision integers
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: mp-arith.c,v $
- * Revision 1.16 2003/05/16 09:09:24 mdw
- * Fix @mp_lsl2c@. Turns out to be surprisingly tricky.
- *
- * Revision 1.15 2002/10/19 17:56:50 mdw
- * Fix bit operations. Test them (a bit) better.
- *
- * Revision 1.14 2002/10/15 19:18:31 mdw
- * New operation to negate numbers.
- *
- * Revision 1.13 2002/10/15 00:19:40 mdw
- * Bit setting and clearing functions.
- *
- * Revision 1.12 2002/10/09 00:36:03 mdw
- * Fix bounds on workspace for Karatsuba operations.
- *
- * Revision 1.11 2002/10/06 22:52:50 mdw
- * Pile of changes for supporting two's complement properly.
- *
- * Revision 1.10 2001/04/03 19:36:05 mdw
- * Add some simple bitwise operations so that Perl can use them.
- *
- * Revision 1.9 2000/10/08 15:48:35 mdw
- * Rename Karatsuba constants now that we have @gfx_kmul@ too.
- *
- * Revision 1.8 2000/10/08 12:02:21 mdw
- * Use @MP_EQ@ instead of @MP_CMP@.
- *
- * Revision 1.7 2000/06/22 19:02:53 mdw
- * New function @mp_odd@ to extract powers of two from an integer. This is
- * common code from the Rabin-Miller test, RSA key recovery and modular
- * square-root extraction.
- *
- * Revision 1.6 2000/06/17 11:45:09 mdw
- * Major memory management overhaul. Added arena support. Use the secure
- * arena for secret integers. Replace and improve the MP management macros
- * (e.g., replace MP_MODIFY by MP_DEST).
- *
- * Revision 1.5 1999/12/22 15:54:41 mdw
- * Adjust Karatsuba parameters. Calculate destination size better.
- *
- * Revision 1.4 1999/12/13 15:35:16 mdw
- * Slightly different rules on memory allocation.
- *
- * Revision 1.3 1999/12/11 10:57:43 mdw
- * Karatsuba squaring algorithm.
- *
- * Revision 1.2 1999/12/10 23:18:39 mdw
- * Change interface for suggested destinations.
- *
- * Revision 1.1 1999/11/17 18:02:16 mdw
- * New multiprecision integer arithmetic suite.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "mp.h"
if (r)
MP_DROP(r);
r = a;
- MP_DEST(r, MP_LEN(a) + 2, a->f | b->f);
+ MP_DEST(r, MAX(MP_LEN(a), MP_LEN(b)) + 2, a->f | b->f);
/* --- Fix up the quotient too --- */