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Annotation of OpenXM_contrib/gmp/mpz/tdiv_r_ui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_tdiv_r_ui(rem, dividend, divisor_limb)
                      2:    -- Set REM to DIVDEND mod DIVISOR_LIMB.
                      3:
                      4: Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
                      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 Library General Public License as published by
                     10: the Free Software Foundation; either version 2 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 Library General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Library 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"
                     25:
                     26: void
                     27: #if __STDC__
                     28: mpz_tdiv_r_ui (mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
                     29: #else
                     30: mpz_tdiv_r_ui (rem, dividend, divisor)
                     31:      mpz_ptr rem;
                     32:      mpz_srcptr dividend;
                     33:      unsigned long int divisor;
                     34: #endif
                     35: {
                     36:   mp_size_t dividend_size;
                     37:   mp_size_t size;
                     38:   mp_limb_t remainder_limb;
                     39:
                     40:   dividend_size = dividend->_mp_size;
                     41:   size = ABS (dividend_size);
                     42:
                     43:   if (size == 0)
                     44:     {
                     45:       rem->_mp_size = 0;
                     46:       return;
                     47:     }
                     48:
                     49:   /* No need for temporary allocation and copying if QUOT == DIVIDEND as
                     50:      the divisor is just one limb, and thus no intermediate remainders
                     51:      need to be stored.  */
                     52:
                     53:   remainder_limb = mpn_mod_1 (dividend->_mp_d, size, (mp_limb_t) divisor);
                     54:
                     55:   if (remainder_limb == 0)
                     56:     rem->_mp_size = 0;
                     57:   else
                     58:     {
                     59:       /* Store the single-limb remainder.  We don't check if there's space
                     60:         for just one limb, since no function ever makes zero space.  */
                     61:       rem->_mp_size = dividend_size >= 0 ? 1 : -1;
                     62:       rem->_mp_d[0] = remainder_limb;
                     63:     }
                     64: }