OpenXM_contrib/gmp/mpz/tdiv_ui.c - diff

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Diff for /OpenXM_contrib/gmp/mpz/Attic/tdiv_ui.c between version 1.1.1.1 and 1.1.1.2

-version 1.1.1.1, 2000/09/09 14:12:59
+version 1.1.1.2, 2003/08/25 16:06:34
 Line 1
 Line 1
 Line 1
- /* mpz_tdiv_ui(dividend, divisor_limb)
+ /* mpz_tdiv_ui(dividend, divisor_limb) -- Return DIVDEND mod DIVISOR_LIMB.
-    -- Return DIVDEND mod DIVISOR_LIMB.
- Copyright (C) 1991, 1993, 1994, 1996, 1997, 1998 Free Software Foundation,
+ Copyright 1991, 1993, 1994, 1996, 1997, 1998, 2001, 2002 Free Software
- Inc.
+ Foundation, Inc.
  This file is part of the GNU MP Library.
-Line 23  MA 02111-1307, USA. */
+Line 22  MA 02111-1307, USA. */
 Line 23  MA 02111-1307, USA. */
 Line 22  MA 02111-1307, USA. */
  #include "gmp.h"
  #include "gmp-impl.h"
+ #include "longlong.h"
  unsigned long int
- #if __STDC__
  mpz_tdiv_ui (mpz_srcptr dividend, unsigned long int divisor)
- #else
- mpz_tdiv_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;
    if (divisor == 0)
      DIVIDE_BY_ZERO;
-   dividend_size = dividend->_mp_size;
+   ns = SIZ(dividend);
-   size = ABS (dividend_size);
+   if (ns == 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
+   np = PTR(dividend);
-      need to be stored.  */
-   remainder_limb = mpn_mod_1 (dividend->_mp_d, size, (mp_limb_t) divisor);
+ #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];
+           return rl;
+         }
+       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);
+       rn = 2 - (rp[1] == 0);  rn -= (rp[rn - 1] == 0);
+     }
+   else
+ #endif
+     {
+       rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
+     }
+   return rl;
  }

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