cdiv_qr.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- /* mpz_cdiv_qr -- Division rounding the quotient towards +infinity. The
- remainder gets the opposite sign as the denominator.
- Copyright 1994, 1995, 1996, 2000, 2001, 2005 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpz_cdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
- {
- mp_size_t divisor_size = divisor->_mp_size;
- mp_size_t xsize;
- mpz_t temp_divisor; /* N.B.: lives until function returns! */
- TMP_DECL;
- TMP_MARK;
- /* We need the original value of the divisor after the quotient and
- remainder have been preliminary calculated. We have to copy it to
- temporary space if it's the same variable as either QUOT or REM. */
- if (quot == divisor || rem == divisor)
- {
- MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
- mpz_set (temp_divisor, divisor);
- divisor = temp_divisor;
- }
- xsize = dividend->_mp_size ^ divisor_size;;
- mpz_tdiv_qr (quot, rem, dividend, divisor);
- if (xsize >= 0 && rem->_mp_size != 0)
- {
- mpz_add_ui (quot, quot, 1L);
- mpz_sub (rem, rem, divisor);
- }
- TMP_FREE;
- }