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Annotation of OpenXM_contrib/gmp/mpz/jacobi.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_jacobi (op1, op2).
                      2:    Contributed by Bennet Yee (bsy) at Carnegie-Mellon University
                      3:
                      4: Copyright (C) 1991, 1996 Free Software Foundation, Inc.
                      5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Library General Public License as published by
                     10: the Free Software Foundation; either version 2 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Library General Public License
                     19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include "gmp.h"
                     24:
                     25: /* Precondition:  both p and q are positive */
                     26:
                     27: int
                     28: #if    __STDC__
                     29: mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi)
                     30: #else
                     31: mpz_jacobi (pi, qi)
                     32:      mpz_srcptr pi, qi;
                     33: #endif
                     34: {
                     35: #if GCDCHECK
                     36:   int retval;
                     37:   mpz_t gcdval;
                     38:
                     39:   mpz_init (gcdval);
                     40:   mpz_gcd (gcdval, pi, qi);
                     41:   if (!mpz_cmp_ui (gcdval, 1L))
                     42:     {
                     43:       /* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */
                     44:       retval = 0;
                     45:     }
                     46:   else
                     47:     retval = mpz_legendre (pi, qi);
                     48:   mpz_clear (gcdval);
                     49:   return retval;
                     50: #else
                     51:   return mpz_legendre (pi, qi);
                     52: #endif
                     53: }