mirror of
https://github.com/vale981/arb
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73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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/*=============================================================================
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This file is part of ARB.
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ARB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2014 Fredrik Johansson
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******************************************************************************/
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#include "arf.h"
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void
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arf_get_fmpz_2exp(fmpz_t man, fmpz_t exp, const arf_t x)
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{
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if (arf_is_special(x))
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{
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fmpz_zero(man);
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fmpz_zero(exp);
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}
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else
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{
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mp_srcptr xptr;
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mp_size_t xn;
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int shift;
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ARF_GET_MPN_READONLY(xptr, xn, x);
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count_trailing_zeros(shift, xptr[0]);
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fmpz_sub_ui(exp, ARF_EXPREF(x), xn * FLINT_BITS - shift);
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if (xn == 1)
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{
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if (ARF_SGNBIT(x))
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fmpz_neg_ui(man, xptr[0] >> shift);
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else
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fmpz_set_ui(man, xptr[0] >> shift);
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}
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else
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{
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__mpz_struct * z = _fmpz_promote(man);
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if (z->_mp_alloc < xn)
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mpz_realloc(z, xn);
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if (shift == 0)
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flint_mpn_copyi(z->_mp_d, xptr, xn);
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else
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mpn_rshift(z->_mp_d, xptr, xn, shift);
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/* top limb cannot be zero */
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z->_mp_size = ARF_SGNBIT(x) ? -xn : xn;
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}
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}
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}
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