OpenXM_contrib/gmp/mpz/fdiv_r_ui.c - diff

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Diff for /OpenXM_contrib/gmp/mpz/Attic/fdiv_r_ui.c between version 1.1 and 1.1.1.3

-version 1.1, 2000/01/10 15:35:27
+version 1.1.1.3, 2003/08/25 16:06:33
 Line 1
 Line 1
 Line 1
  /* mpz_fdiv_r_ui -- Division rounding the quotient towards -infinity.
     The remainder gets the same sign as the denominator.
- Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
+ Copyright 1994, 1995, 1996, 2001, 2002 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
+ 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.
  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
+ 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 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
  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
 Line 24  MA 02111-1307, USA. */
  #include "gmp-impl.h"
  unsigned long int
- #if __STDC__
  mpz_fdiv_r_ui (mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
- #else
- mpz_fdiv_r_ui (rem, dividend, divisor)
-      mpz_ptr rem;
-      mpz_srcptr dividend;
-      unsigned long int divisor;
- #endif
  {
-   mp_size_t dividend_size;
+   mp_size_t ns, nn;
-   mp_size_t size;
+   mp_ptr np;
-   mp_limb_t remainder_limb;
+   mp_limb_t rl;
-   dividend_size = dividend->_mp_size;
+   if (divisor == 0)
-   size = ABS (dividend_size);
+     DIVIDE_BY_ZERO;
-   remainder_limb = mpn_mod_1 (dividend->_mp_d, size, (mp_limb_t) divisor);
+   ns = SIZ(dividend);
+   if (ns == 0)
+     {
+       SIZ(rem) = 0;
+       return 0;
+     }
-   if (remainder_limb != 0 && dividend_size < 0)
+   nn = ABS(ns);
-     remainder_limb = divisor - remainder_limb;
+   np = PTR(dividend);
+ #if GMP_NAIL_BITS != 0
+   if (divisor > GMP_NUMB_MAX)
+     {
+       mp_limb_t dp[2];
+       mp_ptr rp, qp;
+       mp_size_t rn;
+       TMP_DECL (mark);
-   rem->_mp_d[0] = remainder_limb;
+       MPZ_REALLOC (rem, 2);
-   rem->_mp_size = remainder_limb != 0;
+       rp = PTR(rem);
-   return remainder_limb;
+       if (nn == 1)              /* tdiv_qr requirements; tested above for 0 */
+         {
+           rl = np[0];
+           rp[0] = rl;
+         }
+       else
+         {
+           TMP_MARK (mark);
+           dp[0] = divisor & GMP_NUMB_MASK;
+           dp[1] = divisor >> GMP_NUMB_BITS;
+           qp = TMP_ALLOC_LIMBS (nn - 2 + 1);
+           mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
+           TMP_FREE (mark);
+           rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
+         }
+       if (rl != 0 && ns < 0)
+         {
+           rl = divisor - rl;
+           rp[0] = rl & GMP_NUMB_MASK;
+           rp[1] = rl >> GMP_NUMB_BITS;
+         }
+       rn = 1 + (rl > GMP_NUMB_MAX);  rn -= (rp[rn - 1] == 0);
+       SIZ(rem) = rn;
+     }
+   else
+ #endif
+     {
+       rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
+       if (rl == 0)
+         SIZ(rem) = 0;
+       else
+         {
+           if (ns < 0)
+             rl = divisor - rl;
+           PTR(rem)[0] = rl;
+           SIZ(rem) = 1;
+         }
+     }
+   return rl;
  }

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