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Annotation of OpenXM_contrib/gmp/mpz/tdiv_ui.c, Revision 1.1.1.2

1.1.1.2 ! ohara       1: /* mpz_tdiv_ui(dividend, divisor_limb) -- Return DIVDEND mod DIVISOR_LIMB.
1.1       maekawa     2:
1.1.1.2 ! ohara       3: Copyright 1991, 1993, 1994, 1996, 1997, 1998, 2001, 2002 Free Software
        !             4: Foundation, Inc.
1.1       maekawa     5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include "gmp.h"
                     24: #include "gmp-impl.h"
1.1.1.2 ! ohara      25: #include "longlong.h"
1.1       maekawa    26:
                     27: unsigned long int
                     28: mpz_tdiv_ui (mpz_srcptr dividend, unsigned long int divisor)
                     29: {
1.1.1.2 ! ohara      30:   mp_size_t ns, nn;
        !            31:   mp_ptr np;
        !            32:   mp_limb_t rl;
1.1       maekawa    33:
                     34:   if (divisor == 0)
                     35:     DIVIDE_BY_ZERO;
                     36:
1.1.1.2 ! ohara      37:   ns = SIZ(dividend);
        !            38:   if (ns == 0)
        !            39:     {
        !            40:       return 0;
        !            41:     }
        !            42:
        !            43:   nn = ABS(ns);
        !            44:   np = PTR(dividend);
        !            45:
        !            46: #if GMP_NAIL_BITS != 0
        !            47:   if (divisor > GMP_NUMB_MAX)
        !            48:     {
        !            49:       mp_limb_t dp[2], rp[2];
        !            50:       mp_ptr qp;
        !            51:       mp_size_t rn;
        !            52:       TMP_DECL (mark);
        !            53:
        !            54:       if (nn == 1)             /* tdiv_qr requirements; tested above for 0 */
        !            55:        {
        !            56:          rl = np[0];
        !            57:          return rl;
        !            58:        }
        !            59:
        !            60:       TMP_MARK (mark);
        !            61:       dp[0] = divisor & GMP_NUMB_MASK;
        !            62:       dp[1] = divisor >> GMP_NUMB_BITS;
        !            63:       qp = TMP_ALLOC_LIMBS (nn - 2 + 1);
        !            64:       mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
        !            65:       TMP_FREE (mark);
        !            66:       rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
        !            67:       rn = 2 - (rp[1] == 0);  rn -= (rp[rn - 1] == 0);
        !            68:     }
        !            69:   else
        !            70: #endif
        !            71:     {
        !            72:       rl = mpn_mod_1 (np, nn, (mp_limb_t) divisor);
        !            73:     }
1.1       maekawa    74:
1.1.1.2 ! ohara      75:   return rl;
1.1       maekawa    76: }