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: }
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