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https://github.com/vale981/arb
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34 lines
815 B
C
34 lines
815 B
C
/*
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Copyright (C) 2021 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 "double_interval.h"
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di_t
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arb_get_di(const arb_t x)
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{
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di_t res;
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if (arf_is_nan(arb_midref(x)))
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{
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res.a = -D_INF;
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res.b = D_INF;
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}
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else
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{
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arf_t t;
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arf_init(t);
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arb_get_lbound_arf(t, x, 53);
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res.a = arf_get_d(t, ARF_RND_FLOOR);
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arb_get_ubound_arf(t, x, 53);
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res.b = arf_get_d(t, ARF_RND_CEIL);
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arf_clear(t);
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}
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return res;
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}
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