sdiv.c
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- /* sdiv -- Divide a MINT by a short integer. Produce a MINT quotient
- and a short remainder.
- Copyright 1991, 1994, 1995, 2000, 2001 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 "mp.h"
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "longlong.h"
- void
- sdiv (const MINT *dividend, signed short int divisor_short, MINT *quot, short *rem_ptr)
- {
- mp_size_t sign_dividend;
- signed long int sign_divisor;
- mp_size_t dividend_size, quot_size;
- mp_ptr dividend_ptr, quot_ptr;
- mp_limb_t divisor_limb;
- mp_limb_t remainder_limb;
- sign_dividend = dividend->_mp_size;
- dividend_size = ABS (dividend->_mp_size);
- if (dividend_size == 0)
- {
- quot->_mp_size = 0;
- *rem_ptr = 0;
- return;
- }
- sign_divisor = divisor_short;
- divisor_limb = (unsigned short) ABS (divisor_short);
- /* No need for temporary allocation and copying even if QUOT == DIVIDEND
- as the divisor is just one limb, and thus no intermediate remainders
- need to be stored. */
- if (quot->_mp_alloc < dividend_size)
- _mp_realloc (quot, dividend_size);
- quot_ptr = quot->_mp_d;
- dividend_ptr = dividend->_mp_d;
- remainder_limb = mpn_divmod_1 (quot_ptr,
- dividend_ptr, dividend_size, divisor_limb);
- *rem_ptr = sign_dividend >= 0 ? remainder_limb : -remainder_limb;
- /* The quotient is DIVIDEND_SIZE limbs, but the most significant
- might be zero. Set QUOT_SIZE properly. */
- quot_size = dividend_size - (quot_ptr[dividend_size - 1] == 0);
- quot->_mp_size = (sign_divisor ^ sign_dividend) >= 0 ? quot_size : -quot_size;
- }