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Diff for /OpenXM_contrib/gmp/mpz/Attic/powm_ui.c between version 1.1.1.1 and 1.1.1.2

version 1.1.1.1, 2000/01/10 15:35:27 version 1.1.1.2, 2000/09/09 14:12:56
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Line 1 
 /* mpz_powm_ui(res,base,exp,mod) -- Set RES to (base**exp) mod MOD.  /* mpz_powm_ui(res,base,exp,mod) -- Set RES to (base**exp) mod MOD.
   
 Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.  Copyright (C) 1991, 1993, 1994, 1996, 1997, 2000 Free Software Foundation,
   Inc.
   
 This file is part of the GNU MP Library.  This file is part of the GNU MP Library.
   
 The GNU MP Library is free software; you can redistribute it and/or modify  The GNU MP Library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Library General Public License as published by  it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at your  the Free Software Foundation; either version 2.1 of the License, or (at your
 option) any later version.  option) any later version.
   
 The GNU MP Library is distributed in the hope that it will be useful, but  The GNU MP Library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 License for more details.  License for more details.
   
 You should have received a copy of the GNU Library General Public License  You should have received a copy of the GNU Lesser General Public License
 along with the GNU MP Library; see the file COPYING.LIB.  If not, write to  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */  MA 02111-1307, USA. */
   
   #include <stdio.h> /* for NULL */
 #include "gmp.h"  #include "gmp.h"
 #include "gmp-impl.h"  #include "gmp-impl.h"
 #include "longlong.h"  #include "longlong.h"
Line 49  mpz_powm_ui (res, base, exp, mod)
Line 51  mpz_powm_ui (res, base, exp, mod)
   rp = res->_mp_d;    rp = res->_mp_d;
   
   if (msize == 0)    if (msize == 0)
     msize = 1 / msize;          /* provoke a signal */      DIVIDE_BY_ZERO;
   
   if (exp == 0)    if (exp == 0)
     {      {
       rp[0] = 1;        /* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0
            depending on if MOD equals 1.  */
       res->_mp_size = (msize == 1 && (mod->_mp_d)[0] == 1) ? 0 : 1;        res->_mp_size = (msize == 1 && (mod->_mp_d)[0] == 1) ? 0 : 1;
         rp[0] = 1;
       return;        return;
     }      }
   
Line 166  mpz_powm_ui (res, base, exp, mod)
Line 170  mpz_powm_ui (res, base, exp, mod)
   
         mpn_mul_n (xp, rp, rp, rsize);          mpn_mul_n (xp, rp, rp, rsize);
         xsize = 2 * rsize;          xsize = 2 * rsize;
           xsize -= xp[xsize - 1] == 0;
         if (xsize > msize)          if (xsize > msize)
           {            {
             mpn_divmod (xp + msize, xp, xsize, mp, msize);              mpn_divmod (xp + msize, xp, xsize, mp, msize);
Line 179  mpz_powm_ui (res, base, exp, mod)
Line 184  mpz_powm_ui (res, base, exp, mod)
           {            {
             mpn_mul (xp, rp, rsize, bp, bsize);              mpn_mul (xp, rp, rsize, bp, bsize);
             xsize = rsize + bsize;              xsize = rsize + bsize;
               xsize -= xp[xsize - 1] == 0;
             if (xsize > msize)              if (xsize > msize)
               {                {
                 mpn_divmod (xp + msize, xp, xsize, mp, msize);                  mpn_divmod (xp + msize, xp, xsize, mp, msize);
Line 226  mpz_powm_ui (res, base, exp, mod)
Line 232  mpz_powm_ui (res, base, exp, mod)
     MPN_NORMALIZE (rp, rsize);      MPN_NORMALIZE (rp, rsize);
   }    }
   
   res->_mp_size = negative_result == 0 ? rsize : -rsize;    if (negative_result && rsize != 0)
       {
         if (mod_shift_cnt != 0)
           mpn_rshift (mp, mp, msize, mod_shift_cnt);
         mpn_sub (rp, mp, msize, rp, rsize);
         rsize = msize;
         MPN_NORMALIZE (rp, rsize);
       }
     res->_mp_size = rsize;
   
   if (free_me != NULL)    if (free_me != NULL)
     (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);      (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
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  Added in v.1.1.1.2
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