mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
107 lines
3 KiB
C
107 lines
3 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) 2012, 2013 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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static slong
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_fmpr_add_special(fmpr_t z, const fmpr_t x, const fmpr_t y, slong prec, fmpr_rnd_t rnd)
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{
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if (fmpr_is_zero(x))
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{
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if (fmpr_is_zero(y))
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{
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fmpr_zero(z);
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return FMPR_RESULT_EXACT;
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}
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else
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return fmpr_set_round(z, y, prec, rnd);
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}
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else if (fmpr_is_zero(y))
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{
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return fmpr_set_round(z, x, prec, rnd);
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}
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else if (fmpr_is_nan(x) || fmpr_is_nan(y)
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|| (fmpr_is_pos_inf(x) && fmpr_is_neg_inf(y))
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|| (fmpr_is_neg_inf(x) && fmpr_is_pos_inf(y)))
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{
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fmpr_nan(z);
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return FMPR_RESULT_EXACT;
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}
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else if (fmpr_is_special(x))
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{
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fmpr_set(z, x);
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return FMPR_RESULT_EXACT;
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}
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else
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{
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fmpr_set(z, y);
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return FMPR_RESULT_EXACT;
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}
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}
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slong
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fmpr_add(fmpr_t z, const fmpr_t x, const fmpr_t y, slong prec, fmpr_rnd_t rnd)
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{
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slong shift, xn, yn;
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mp_limb_t xtmp, ytmp;
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mp_ptr xptr, yptr;
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fmpz xv, yv;
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const fmpz * xexp;
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const fmpz * yexp;
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int xsign, ysign;
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if (fmpr_is_special(x) || fmpr_is_special(y))
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{
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return _fmpr_add_special(z, x, y, prec, rnd);
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}
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shift = _fmpz_sub_small(fmpr_expref(y), fmpr_expref(x));
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if (shift >= 0)
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{
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xexp = fmpr_expref(x);
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yexp = fmpr_expref(y);
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xv = *fmpr_manref(x);
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yv = *fmpr_manref(y);
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}
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else
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{
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xexp = fmpr_expref(y);
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yexp = fmpr_expref(x);
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xv = *fmpr_manref(y);
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yv = *fmpr_manref(x);
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shift = -shift;
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}
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FMPZ_GET_MPN_READONLY(xsign, xn, xptr, xtmp, xv)
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FMPZ_GET_MPN_READONLY(ysign, yn, yptr, ytmp, yv)
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if ((xn == 1) && (yn == 1) && (shift < FLINT_BITS))
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return _fmpr_add_1x1(z, xptr[0], xsign, xexp, yptr[0], ysign, yexp, shift, prec, rnd);
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else
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return _fmpr_add_mpn(z, xptr, xn, xsign, xexp, yptr, yn, ysign, yexp, shift, prec, rnd);
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}
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