mirror of
https://github.com/vale981/arb
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44 lines
1 KiB
C
44 lines
1 KiB
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 "arf.h"
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void
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arf_floor(arf_t z, const arf_t x)
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{
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if (arf_is_special(x) || arf_is_int(x))
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{
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arf_set(z, x);
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}
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else
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{
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slong exp = ARF_EXP(x);
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/* now exp cannot be too large, as we would have
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caught this in arf_is_int() */
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if (COEFF_IS_MPZ(exp) || exp <= 0)
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{
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if (ARF_SGNBIT(x))
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arf_set_si(z, -1);
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else
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arf_zero(z);
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}
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else if (exp == 1)
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{
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arf_set_si(z, ARF_SGNBIT(x) ? -2 : 1);
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}
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else
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{
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arf_set_round(z, x, exp, ARF_RND_FLOOR);
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}
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}
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}
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