mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
46 lines
1 KiB
C
46 lines
1 KiB
C
/*
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Copyright (C) 2013 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 "fmpr.h"
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slong
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fmpr_abs_bound_lt_2exp_si(const fmpr_t x)
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{
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if (fmpr_is_special(x))
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{
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if (fmpr_is_zero(x))
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return -FMPR_PREC_EXACT;
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else
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return FMPR_PREC_EXACT;
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}
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else
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{
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slong res;
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fmpz_t t;
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fmpz_init(t);
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fmpr_abs_bound_lt_2exp_fmpz(t, x);
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if (fmpz_fits_si(t))
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res = fmpz_get_si(t);
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else
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res = fmpz_sgn(t) < 0 ? -FMPR_PREC_EXACT : FMPR_PREC_EXACT;
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fmpz_clear(t);
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if (res < -FMPR_PREC_EXACT)
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res = -FMPR_PREC_EXACT;
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if (res > FMPR_PREC_EXACT)
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res = FMPR_PREC_EXACT;
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return res;
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}
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}
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