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38 lines
848 B
C
38 lines
848 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 "flint/double_extras.h"
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#include "mag.h"
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double
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mag_get_d(const mag_t z)
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{
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if (mag_is_zero(z))
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{
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return 0.0;
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}
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else if (mag_is_inf(z))
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{
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return D_INF;
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}
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else if (MAG_EXP(z) < -1000 || MAG_EXP(z) > 1000)
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{
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if (fmpz_sgn(MAG_EXPREF(z)) < 0)
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return ldexp(1.0, -1000);
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else
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return D_INF;
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}
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else
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{
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return ldexp(MAG_MAN(z), MAG_EXP(z) - MAG_BITS);
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}
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}
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