mirror of
https://github.com/vale981/arb
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66 lines
1.9 KiB
C
66 lines
1.9 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 "mag.h"
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void
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mag_div(mag_t z, const mag_t x, const mag_t y)
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{
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if (mag_is_special(x) || mag_is_special(y))
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{
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if (mag_is_zero(y) || mag_is_inf(x))
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mag_inf(z);
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else
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mag_zero(z);
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}
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else
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{
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mp_limb_t q;
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long fix;
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#if FLINT_BITS == 64
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q = (MAG_MAN(x) << MAG_BITS) / MAG_MAN(y) + 1;
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#else
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mp_limb_t hi, lo, r;
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lo = MAG_MAN(x) << MAG_BITS;
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hi = MAG_MAN(x) >> (FLINT_BITS - MAG_BITS);
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udiv_qrnnd(q, r, hi, lo, MAG_MAN(y));
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q += 1;
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#endif
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fix = q >> MAG_BITS;
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q = (q >> fix) + fix;
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/* could overflow to next power of two */
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if (q >> MAG_BITS)
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{
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q >>= 1;
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fix += 1;
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}
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MAG_MAN(z) = q;
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_fmpz_sub2_fast(MAG_EXPREF(z), MAG_EXPREF(x), MAG_EXPREF(y), fix);
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}
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}
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