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

1.1       maekawa     1: /* mpz_tdiv_q_ui(quot, dividend, divisor_limb)
                      2:    -- Divide DIVIDEND by DIVISOR_LIMB and store the result in QUOT.
                      3:
1.1.1.2 ! maekawa     4: Copyright (C) 1991, 1993, 1994, 1996, 1998 Free Software 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
1.1.1.2 ! maekawa     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
1.1       maekawa    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
1.1.1.2 ! maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2 ! maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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:
1.1.1.2 ! maekawa    26: unsigned long int
1.1       maekawa    27: #if __STDC__
                     28: mpz_tdiv_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
                     29: #else
                     30: mpz_tdiv_q_ui (quot, dividend, divisor)
                     31:      mpz_ptr quot;
                     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_ptr quot_ptr;
1.1.1.2 ! maekawa    39:   mp_limb_t remainder_limb;
        !            40:
        !            41:   if (divisor == 0)
        !            42:     DIVIDE_BY_ZERO;
1.1       maekawa    43:
                     44:   dividend_size = dividend->_mp_size;
                     45:   size = ABS (dividend_size);
                     46:
                     47:   /* No need for temporary allocation and copying if QUOT == DIVIDEND as
                     48:      the divisor is just one limb, and thus no intermediate remainders
                     49:      need to be stored.  */
                     50:
                     51:   if (quot->_mp_alloc < size)
                     52:     _mpz_realloc (quot, size);
                     53:
                     54:   quot_ptr = quot->_mp_d;
                     55:
1.1.1.2 ! maekawa    56:   remainder_limb
        !            57:     = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size, (mp_limb_t) divisor);
1.1       maekawa    58:
                     59:   /* The quotient is SIZE limbs, but the most significant might be zero. */
1.1.1.2 ! maekawa    60:   size -= size != 0 && quot_ptr[size - 1] == 0;
1.1       maekawa    61:   quot->_mp_size = dividend_size >= 0 ? size : -size;
1.1.1.2 ! maekawa    62:
        !            63:   return remainder_limb;
1.1       maekawa    64: }