OpenXM_contrib/gmp/mpz/cdiv_ui.c - diff

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Diff for /OpenXM_contrib/gmp/mpz/Attic/cdiv_ui.c between version 1.1.1.2 and 1.1.1.3

-version 1.1.1.2, 2000/09/09 14:12:49
+version 1.1.1.3, 2003/08/25 16:06:32
 Line 3
 Line 3
 Line 3
     always fit into the return type, the negative of the true remainder is
     returned.
- 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.
 Line 26  MA 02111-1307, USA. */
 Line 26  MA 02111-1307, USA. */
 Line 26  MA 02111-1307, USA. */
  #include "gmp-impl.h"
  unsigned long int
- #if __STDC__
  mpz_cdiv_ui (mpz_srcptr dividend, unsigned long int divisor)
- #else
- mpz_cdiv_ui (dividend, divisor)
-      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)
+     {
+       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], rp[2];
+       mp_ptr qp;
+       mp_size_t rn;
+       TMP_DECL (mark);
-   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);
+     }
+   else
+ #endif
+     {
+       rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
+       if (rl == 0)
+         ;
+       else
+         {
+           if (ns >= 0)
+             rl = divisor - rl;
+         }
+     }
+   return rl;
  }

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