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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* mpz_divexact_ui -- exact division mpz by ulong.
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Copyright 2001, 2002, 2012 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 either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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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 General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpz_divexact_ui (mpz_ptr dst, mpz_srcptr src, unsigned long divisor)
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{
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mp_size_t size, abs_size;
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mp_ptr dst_ptr;
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if (UNLIKELY (divisor == 0))
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DIVIDE_BY_ZERO;
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/* For nails don't try to be clever if d is bigger than a limb, just fake
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up an mpz_t and go to the main mpz_divexact. */
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if (divisor > GMP_NUMB_MAX)
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{
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mp_limb_t dlimbs[2];
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mpz_t dz;
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ALLOC(dz) = 2;
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PTR(dz) = dlimbs;
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mpz_set_ui (dz, divisor);
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mpz_divexact (dst, src, dz);
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return;
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}
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size = SIZ(src);
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if (size == 0)
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{
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SIZ(dst) = 0;
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return;
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}
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abs_size = ABS (size);
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dst_ptr = MPZ_REALLOC (dst, abs_size);
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MPN_DIVREM_OR_DIVEXACT_1 (dst_ptr, PTR(src), abs_size, (mp_limb_t) divisor);
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abs_size -= (dst_ptr[abs_size-1] == 0);
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SIZ(dst) = (size >= 0 ? abs_size : -abs_size);
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}
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