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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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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_add_2exp_fmpz(mag_t z, const mag_t x, const fmpz_t e)
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{
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if (mag_is_special(x))
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{
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if (mag_is_zero(x))
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{
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MAG_MAN(z) = MAG_ONE_HALF;
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_fmpz_add_fast(MAG_EXPREF(z), e, 1);
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}
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else
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{
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mag_inf(z);
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}
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}
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else
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{
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slong shift;
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shift = _fmpz_sub_small(MAG_EXPREF(x), e);
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if (shift > 0)
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{
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_fmpz_set_fast(MAG_EXPREF(z), MAG_EXPREF(x));
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if (shift >= MAG_BITS)
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MAG_MAN(z) = MAG_MAN(x) + LIMB_ONE;
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else
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MAG_MAN(z) = MAG_MAN(x) + (LIMB_ONE << (MAG_BITS - shift));
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}
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else
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{
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shift = -shift;
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_fmpz_add_fast(MAG_EXPREF(z), e, 1);
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if (shift >= MAG_BITS)
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MAG_MAN(z) = MAG_ONE_HALF + LIMB_ONE;
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else
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MAG_MAN(z) = MAG_ONE_HALF + (MAG_MAN(x) >> (shift + 1)) + LIMB_ONE;
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}
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MAG_ADJUST_ONE_TOO_LARGE(z);
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}
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}
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