mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*=============================================================================
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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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int
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arf_sub_special(arf_t z, const arf_t x, const arf_t y, long prec, arf_rnd_t rnd)
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{
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if (arf_is_zero(x))
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{
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if (arf_is_zero(y))
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{
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arf_zero(z);
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return 0;
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}
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else
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return arf_neg_round(z, y, prec, rnd);
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}
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else if (arf_is_zero(y))
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{
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return arf_set_round(z, x, prec, rnd);
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}
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else if (arf_is_nan(x) || arf_is_nan(y)
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|| (arf_is_pos_inf(x) && arf_is_pos_inf(y))
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|| (arf_is_neg_inf(x) && arf_is_neg_inf(y)))
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{
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arf_nan(z);
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return 0;
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}
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else if (arf_is_special(x))
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{
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arf_set(z, x);
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return 0;
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}
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else
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{
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arf_neg(z, y);
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return 0;
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}
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}
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int
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arf_sub(arf_ptr z, arf_srcptr x, arf_srcptr y, long prec, arf_rnd_t rnd)
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{
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mp_size_t xn, yn;
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mp_srcptr xptr, yptr;
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long shift;
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if (arf_is_special(x) || arf_is_special(y))
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{
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return arf_sub_special(z, x, y, prec, rnd);
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}
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shift = _fmpz_sub_small(ARF_EXPREF(x), ARF_EXPREF(y));
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ARF_GET_MPN_READONLY(xptr, xn, x);
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ARF_GET_MPN_READONLY(yptr, yn, y);
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if (shift >= 0)
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return _arf_add_mpn(z, xptr, xn, ARF_SGNBIT(x), ARF_EXPREF(x),
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yptr, yn, ARF_SGNBIT(y) ^ 1, shift, prec, rnd);
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else
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return _arf_add_mpn(z, yptr, yn, ARF_SGNBIT(y) ^ 1, ARF_EXPREF(y),
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xptr, xn, ARF_SGNBIT(x), -shift, prec, rnd);
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}
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