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41 lines
824 B
C
41 lines
824 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 di_fast_sqr(di_t x)
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{
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di_t res;
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if (x.a >= 0)
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{
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res.a = x.a * x.a;
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res.b = x.b * x.b;
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}
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else if (x.b <= 0)
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{
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res.a = x.b * x.b;
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res.b = x.a * x.a;
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}
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else
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{
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res.a = 0.0;
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res.b = FLINT_MAX(x.a * x.a, x.b * x.b);
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}
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if (res.a != 0.0)
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res.a = _di_below(res.a);
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res.b = _di_above(res.b);
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return res;
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}
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