OpenXM_contrib/gmp/mpz/tdiv_qr_ui.c - diff

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

-version 1.1.1.2, 2000/09/09 14:12:59
+version 1.1.1.3, 2003/08/25 16:06:34
 Line 2
 Line 2
 Line 2
     Set QUOT to DIVIDEND / SHORT_DIVISOR
     and REM to DIVIDEND mod SHORT_DIVISOR.
- Copyright (C) 1991, 1993, 1994, 1996, 1998 Free Software Foundation, Inc.
+ Copyright 1991, 1993, 1994, 1996, 1998, 2001, 2002 Free Software Foundation,
+ Inc.
  This file is part of the GNU MP Library.
-Line 25  MA 02111-1307, USA. */
+Line 26  MA 02111-1307, USA. */
 Line 25  MA 02111-1307, USA. */
 Line 26  MA 02111-1307, USA. */
  #include "gmp-impl.h"
  unsigned long int
- #if __STDC__
  mpz_tdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
- #else
- mpz_tdiv_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;
+     }
-   /* No need for temporary allocation and copying if QUOT == DIVIDEND as
+   nn = ABS(ns);
-      the divisor is just one limb, and thus no intermediate remainders
+   MPZ_REALLOC (quot, nn);
-      need to be stored.  */
+   qp = PTR(quot);
+   np = PTR(dividend);
-   if (quot->_mp_alloc < size)
+ #if GMP_NAIL_BITS != 0
-     _mpz_realloc (quot, size);
+   if (divisor > GMP_NUMB_MAX)
+     {
+       mp_limb_t dp[2];
+       mp_ptr rp;
+       mp_size_t rn;
-   quot_ptr = quot->_mp_d;
+       if (nn == 1)              /* tdiv_qr requirements; tested above for 0 */
+         {
+           SIZ(quot) = 0;
+           rl = np[0];
+           SIZ(rem) = ns >= 0 ? 1 : -1;
+           PTR(rem)[0] = rl;
+           return rl;
+         }
-   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)
+       dp[0] = divisor & GMP_NUMB_MASK;
-     rem->_mp_size = 0;
+       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; qn -= qp[qn - 1] == 0; qn -= qn != 0 && qp[qn - 1] == 0;
+       rn = 2 - (rp[1] == 0);  rn -= (rp[rn - 1] == 0);
+       SIZ(rem) = ns >= 0 ? rn : -rn;
+     }
    else
+ #endif
      {
-       /* Store the single-limb remainder.  We don't check if there's space
+       rl = mpn_divrem_1 (qp, (mp_size_t) 0, np, nn, (mp_limb_t) divisor);
-          for just one limb, since no function ever makes zero space.  */
+       if (rl == 0)
-       rem->_mp_size = dividend_size >= 0 ? 1 : -1;
+         SIZ(rem) = 0;
-       rem->_mp_d[0] = remainder_limb;
+       else
+         {
+           /* Store the single-limb remainder.  We don't check if there's space
+              for just one limb, since no function ever makes zero space.  */
+           SIZ(rem) = ns >= 0 ? 1 : -1;
+           PTR(rem)[0] = rl;
+         }
+       qn = nn - (qp[nn - 1] == 0);
      }
-   /* The quotient is SIZE limbs, but the most significant might be zero. */
+   SIZ(quot) = ns >= 0 ? qn : -qn;
-   size -= size != 0 && quot_ptr[size - 1] == 0;
+   return rl;
-   quot->_mp_size = dividend_size >= 0 ? size : -size;
-   return remainder_limb;
  }

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