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Annotation of OpenXM_contrib/gmp/mpz/tdiv_q_ui.c, Revision 1.1

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:
        !             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_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;
        !            39:
        !            40:   dividend_size = dividend->_mp_size;
        !            41:   size = ABS (dividend_size);
        !            42:
        !            43:   if (size == 0)
        !            44:     {
        !            45:       quot->_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:   if (quot->_mp_alloc < size)
        !            54:     _mpz_realloc (quot, size);
        !            55:
        !            56:   quot_ptr = quot->_mp_d;
        !            57:
        !            58:   mpn_divmod_1 (quot_ptr, dividend->_mp_d, size, (mp_limb_t) divisor);
        !            59:
        !            60:   /* The quotient is SIZE limbs, but the most significant might be zero. */
        !            61:   size -= quot_ptr[size - 1] == 0;
        !            62:   quot->_mp_size = dividend_size >= 0 ? size : -size;
        !            63: }