dive_ui.c
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上传日期:2022-08-06
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- /* mpz_divexact_ui -- exact division mpz by ulong.
- Copyright 2001, 2002 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_divexact_ui (mpz_ptr dst, mpz_srcptr src, unsigned long divisor)
- {
- mp_size_t size, abs_size;
- mp_ptr dst_ptr;
- if (divisor == 0)
- DIVIDE_BY_ZERO;
- /* For nails don't try to be clever if d is bigger than a limb, just fake
- up an mpz_t and go to the main mpz_divexact. */
- if (divisor > GMP_NUMB_MAX)
- {
- mp_limb_t dlimbs[2];
- mpz_t dz;
- ALLOC(dz) = 2;
- PTR(dz) = dlimbs;
- mpz_set_ui (dz, divisor);
- mpz_divexact (dst, src, dz);
- return;
- }
- size = SIZ(src);
- if (size == 0)
- {
- SIZ(dst) = 0;
- return;
- }
- abs_size = ABS (size);
- MPZ_REALLOC (dst, abs_size);
- dst_ptr = PTR(dst);
- MPN_DIVREM_OR_DIVEXACT_1 (dst_ptr, PTR(src), abs_size, (mp_limb_t) divisor);
- abs_size -= (dst_ptr[abs_size-1] == 0);
- SIZ(dst) = (size >= 0 ? abs_size : -abs_size);
- }