Annotation of OpenXM_contrib/gmp/mpz/tdiv_qr_ui.c, Revision 1.1
1.1 ! maekawa 1: /* mpz_tdiv_qr_ui(quot,rem,dividend,short_divisor) --
! 2: Set QUOT to DIVIDEND / SHORT_DIVISOR
! 3: and REM to DIVIDEND mod SHORT_DIVISOR.
! 4:
! 5: Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
! 6:
! 7: This file is part of the GNU MP Library.
! 8:
! 9: The GNU MP Library is free software; you can redistribute it and/or modify
! 10: it under the terms of the GNU Library General Public License as published by
! 11: the Free Software Foundation; either version 2 of the License, or (at your
! 12: option) any later version.
! 13:
! 14: The GNU MP Library is distributed in the hope that it will be useful, but
! 15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 16: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
! 17: License for more details.
! 18:
! 19: You should have received a copy of the GNU Library General Public License
! 20: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! 21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 22: MA 02111-1307, USA. */
! 23:
! 24: #include "gmp.h"
! 25: #include "gmp-impl.h"
! 26:
! 27: void
! 28: #if __STDC__
! 29: mpz_tdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
! 30: #else
! 31: mpz_tdiv_qr_ui (quot, rem, dividend, divisor)
! 32: mpz_ptr quot;
! 33: mpz_ptr rem;
! 34: mpz_srcptr dividend;
! 35: unsigned long int divisor;
! 36: #endif
! 37: {
! 38: mp_size_t dividend_size;
! 39: mp_size_t size;
! 40: mp_ptr quot_ptr;
! 41: mp_limb_t remainder_limb;
! 42:
! 43: dividend_size = dividend->_mp_size;
! 44: size = ABS (dividend_size);
! 45:
! 46: if (size == 0)
! 47: {
! 48: quot->_mp_size = 0;
! 49: rem->_mp_size = 0;
! 50: return;
! 51: }
! 52:
! 53: /* No need for temporary allocation and copying if QUOT == DIVIDEND as
! 54: the divisor is just one limb, and thus no intermediate remainders
! 55: need to be stored. */
! 56:
! 57: if (quot->_mp_alloc < size)
! 58: _mpz_realloc (quot, size);
! 59:
! 60: quot_ptr = quot->_mp_d;
! 61:
! 62: remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
! 63: (mp_limb_t) divisor);
! 64:
! 65: if (remainder_limb == 0)
! 66: rem->_mp_size = 0;
! 67: else
! 68: {
! 69: /* Store the single-limb remainder. We don't check if there's space
! 70: for just one limb, since no function ever makes zero space. */
! 71: rem->_mp_size = dividend_size >= 0 ? 1 : -1;
! 72: rem->_mp_d[0] = remainder_limb;
! 73: }
! 74:
! 75: /* The quotient is SIZE limbs, but the most significant might be zero. */
! 76: size -= quot_ptr[size - 1] == 0;
! 77: quot->_mp_size = dividend_size >= 0 ? size : -size;
! 78: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>