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Diff for /OpenXM_contrib/gmp/mpz/Attic/tdiv_qr_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 16:06:34
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    Set QUOT to DIVIDEND / SHORT_DIVISOR     Set QUOT to DIVIDEND / SHORT_DIVISOR
    and REM to DIVIDEND mod SHORT_DIVISOR.     and REM to DIVIDEND mod SHORT_DIVISOR.
   
 Copyright (C) 1991, 1993, 1994, 1996 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.  This file is part of the GNU MP Library.
   
 The GNU MP Library is free software; you can redistribute it and/or modify  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.  option) any later version.
   
 The GNU MP Library is distributed in the hope that it will be useful, but  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  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.  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  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,  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */  MA 02111-1307, USA. */
Line 24  MA 02111-1307, USA. */
Line 25  MA 02111-1307, USA. */
 #include "gmp.h"  #include "gmp.h"
 #include "gmp-impl.h"  #include "gmp-impl.h"
   
 void  unsigned long int
 #if __STDC__  
 mpz_tdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)  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;  
   
   dividend_size = dividend->_mp_size;    if (divisor == 0)
   size = ABS (dividend_size);      DIVIDE_BY_ZERO;
   
   if (size == 0)    ns = SIZ(dividend);
     if (ns == 0)
     {      {
       quot->_mp_size = 0;        SIZ(quot) = 0;
       rem->_mp_size = 0;        SIZ(rem) = 0;
       return;        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    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 -= quot_ptr[size - 1] == 0;    return rl;
   quot->_mp_size = dividend_size >= 0 ? size : -size;  
 }  }
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  Added in v.1.1.1.3
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