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https://github.com/vale981/arb
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42 lines
986 B
C
42 lines
986 B
C
/*
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Copyright (C) 2014 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "arf.h"
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slong
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arf_abs_bound_lt_2exp_si(const arf_t x)
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{
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slong res;
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if (arf_is_special(x))
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{
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if (arf_is_zero(x))
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return -ARF_PREC_EXACT;
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else
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return ARF_PREC_EXACT;
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}
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if (!COEFF_IS_MPZ(ARF_EXP(x)))
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return ARF_EXP(x);
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if (fmpz_fits_si(ARF_EXPREF(x)))
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res = fmpz_get_si(ARF_EXPREF(x));
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else
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res = fmpz_sgn(ARF_EXPREF(x)) < 0 ? -ARF_PREC_EXACT : ARF_PREC_EXACT;
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if (res < -ARF_PREC_EXACT)
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res = -ARF_PREC_EXACT;
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if (res > ARF_PREC_EXACT)
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res = ARF_PREC_EXACT;
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return res;
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}
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