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authortege <tege@gmplib.org>1996-05-08 09:10:48 +0200
committertege <tege@gmplib.org>1996-05-08 09:10:48 +0200
commitc6d715868f53b08c62a129ffd77fb585fd89c43b (patch)
tree82f36d2d8cbe7e07ad3e18d5c6e047e8796d861e /mpz/jacobi.c
downloadgmp-c6d715868f53b08c62a129ffd77fb585fd89c43b.tar.gz
Initial revision
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+/* mpz_jacobi (op1, op2).
+ Contributed by Bennet Yee (bsy) at Carnegie-Mellon University
+
+Copyright (C) 1991, 1996 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+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
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+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
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+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,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+
+/* Precondition: both p and q are positive */
+
+int
+#if __STDC__
+mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi)
+#else
+mpz_jacobi (pi, qi)
+ mpz_srcptr pi, qi;
+#endif
+{
+#if GCDCHECK
+ int retval;
+ mpz_t gcdval;
+
+ mpz_init (gcdval);
+ mpz_gcd (gcdval, pi, qi);
+ if (!mpz_cmp_ui (gcdval, 1L))
+ {
+ /* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */
+ retval = 0;
+ }
+ else
+ retval = mpz_legendre (pi, qi);
+ mpz_clear (gcdval);
+ return retval;
+#else
+ return mpz_legendre (pi, qi);
+#endif
+}