79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* mpz_tdiv_qr_ui(quot,rem,dividend,short_divisor) --
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Set QUOT to DIVIDEND / SHORT_DIVISOR
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and REM to DIVIDEND mod SHORT_DIVISOR.
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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#if __STDC__
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mpz_tdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
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#else
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mpz_tdiv_qr_ui (quot, rem, dividend, divisor)
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mpz_ptr quot;
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mpz_ptr rem;
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mpz_srcptr dividend;
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unsigned long int divisor;
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#endif
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{
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mp_size_t dividend_size;
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mp_size_t size;
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mp_ptr quot_ptr;
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mp_limb_t remainder_limb;
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dividend_size = dividend->_mp_size;
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size = ABS (dividend_size);
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if (size == 0)
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{
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quot->_mp_size = 0;
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rem->_mp_size = 0;
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return;
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}
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/* No need for temporary allocation and copying if QUOT == DIVIDEND as
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the divisor is just one limb, and thus no intermediate remainders
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need to be stored. */
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if (quot->_mp_alloc < size)
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_mpz_realloc (quot, size);
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quot_ptr = quot->_mp_d;
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remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
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(mp_limb_t) divisor);
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if (remainder_limb == 0)
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rem->_mp_size = 0;
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else
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{
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/* Store the single-limb remainder. We don't check if there's space
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for just one limb, since no function ever makes zero space. */
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rem->_mp_size = dividend_size >= 0 ? 1 : -1;
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rem->_mp_d[0] = remainder_limb;
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}
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/* The quotient is SIZE limbs, but the most significant might be zero. */
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size -= quot_ptr[size - 1] == 0;
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quot->_mp_size = dividend_size >= 0 ? size : -size;
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}
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