Reorganisation of the source tree

[ghc-hetmet.git] / rts / gmp / mpz / jacobi.c

diff --git a/rts/gmp/mpz/jacobi.c b/rts/gmp/mpz/jacobi.c
new file mode 100644 (file)
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+++ b/rts/gmp/mpz/jacobi.c
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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 Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public
+License for more details.
+
+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
+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
+}