OpenXM_contrib/gmp/mpz/fdiv_qr_ui.c - diff

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

-version 1.1.1.2, 2000/09/09 14:12:51
+version 1.1.1.3, 2003/08/25 16:06:33
 Line 1
 Line 1
 Line 1
  /* mpz_fdiv_qr_ui -- Division rounding the quotient towards -infinity.
     The remainder gets the same sign as the denominator.
- Copyright (C) 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
+ Copyright 1994, 1995, 1996, 1999, 2001, 2002 Free Software Foundation, Inc.
  This file is part of the GNU MP Library.
 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_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
- #else
- mpz_fdiv_qr_ui (quot, rem, dividend, divisor)
-      mpz_ptr quot;
-      mpz_ptr rem;
-      mpz_srcptr dividend;
-      unsigned long int divisor;
- #endif
  {
-   mp_size_t dividend_size;
+   mp_size_t ns, nn, qn;
-   mp_size_t size;
+   mp_ptr np, qp;
-   mp_ptr quot_ptr;
+   mp_limb_t rl;
-   mp_limb_t remainder_limb;
    if (divisor == 0)
      DIVIDE_BY_ZERO;
-   dividend_size = dividend->_mp_size;
+   ns = SIZ(dividend);
-   size = ABS (dividend_size);
+   if (ns == 0)
+     {
+       SIZ(quot) = 0;
+       SIZ(rem) = 0;
+       return 0;
+     }
-   if (quot->_mp_alloc < size)
+   nn = ABS(ns);
-     _mpz_realloc (quot, size);
+   MPZ_REALLOC (quot, nn);
+   qp = PTR(quot);
+   np = PTR(dividend);
-   quot_ptr = quot->_mp_d;
+ #if GMP_NAIL_BITS != 0
+   if (divisor > GMP_NUMB_MAX)
+     {
+       mp_limb_t dp[2];
+       mp_ptr rp;
+       mp_size_t rn;
-   remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
+       MPZ_REALLOC (rem, 2);
-                                  (mp_limb_t) divisor);
+       rp = PTR(rem);
-   if (remainder_limb != 0 && dividend_size < 0)
+       if (nn == 1)              /* tdiv_qr requirements; tested above for 0 */
-     {
+         {
-       mpn_incr_u (quot_ptr, (mp_limb_t) 1);
+           qp[0] = 0;
-       remainder_limb = divisor - remainder_limb;
+           qn = 1;               /* a white lie, fixed below */
-     }
+           rl = np[0];
+           rp[0] = rl;
+         }
+       else
+         {
+           dp[0] = divisor & GMP_NUMB_MASK;
+           dp[1] = divisor >> GMP_NUMB_BITS;
+           mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
+           rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
+           qn = nn - 2 + 1;
+         }
-   size -= size != 0 && quot_ptr[size - 1] == 0;
+       if (rl != 0 && ns < 0)
-   quot->_mp_size = dividend_size >= 0 ? size : -size;
+         {
+           mpn_incr_u (qp, (mp_limb_t) 1);
+           rl = divisor - rl;
+           rp[0] = rl & GMP_NUMB_MASK;
+           rp[1] = rl >> GMP_NUMB_BITS;
+         }
-   rem->_mp_d[0] = remainder_limb;
+       qn -= qp[qn - 1] == 0; qn -= qn != 0 && qp[qn - 1] == 0;
-   rem->_mp_size = remainder_limb != 0;
+       rn = 1 + (rl > GMP_NUMB_MAX);  rn -= (rp[rn - 1] == 0);
+       SIZ(rem) = rn;
+     }
+   else
+ #endif
+     {
+       rl = mpn_divrem_1 (qp, (mp_size_t) 0, np, nn, (mp_limb_t) divisor);
+       if (rl == 0)
+         SIZ(rem) = 0;
+       else
+         {
+           if (ns < 0)
+             {
+               mpn_incr_u (qp, (mp_limb_t) 1);
+               rl = divisor - rl;
+             }
-   return remainder_limb;
+           PTR(rem)[0] = rl;
+           SIZ(rem) = rl != 0;
+         }
+       qn = nn - (qp[nn - 1] == 0);
+     }
+   SIZ(quot) = ns >= 0 ? qn : -qn;
+   return rl;
  }

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