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30 lines
719 B
C
30 lines
719 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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#include "mag.h"
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double mag_d_log_lower_bound(double x);
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double mag_d_log_upper_bound(double x);
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di_t di_fast_log_nonnegative(di_t x)
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{
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di_t res;
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if (x.a <= 0.0)
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res.a = -D_INF;
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else
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res.a = mag_d_log_lower_bound(x.a);
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res.b = mag_d_log_upper_bound(x.b);
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return res;
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}
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