mirror of
https://github.com/vale981/arb
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81 lines
2.3 KiB
C
81 lines
2.3 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) 2014 Fredrik Johansson
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******************************************************************************/
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#include "mag.h"
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void
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mag_addmul(mag_t z, const mag_t x, const mag_t y)
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{
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if (mag_is_zero(z))
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{
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mag_mul(z, x, y);
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}
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else if (mag_is_inf(z) || mag_is_inf(x) || mag_is_inf(y))
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{
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mag_inf(z);
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}
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else if (mag_is_zero(x) || mag_is_zero(y))
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{
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return;
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}
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else
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{
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long shift;
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fmpz_t e;
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fmpz_init(e);
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/* x*y < 2^e */
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_fmpz_add2_fast(e, MAG_EXPREF(x), MAG_EXPREF(y), 0);
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shift = _fmpz_sub_small(MAG_EXPREF(z), e);
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if (shift >= 0)
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{
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if (shift >= MAG_BITS)
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MAG_MAN(z)++;
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else
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MAG_MAN(z) = MAG_MAN(z) + (MAG_FIXMUL(MAG_MAN(x),
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MAG_MAN(y)) >> shift) + LIMB_ONE;
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}
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else
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{
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shift = -shift;
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fmpz_swap(MAG_EXPREF(z), e);
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if (shift >= MAG_BITS)
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MAG_MAN(z) = MAG_FIXMUL(MAG_MAN(x), MAG_MAN(y))
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+ (2 * LIMB_ONE);
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else
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MAG_MAN(z) = MAG_FIXMUL(MAG_MAN(x), MAG_MAN(y))
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+ (MAG_MAN(z) >> shift) + (2 * LIMB_ONE);
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MAG_ADJUST_ONE_TOO_SMALL(z);
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}
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MAG_ADJUST_ONE_TOO_LARGE(z);
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fmpz_clear(e);
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}
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}
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