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https://github.com/vale981/arb
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32 lines
775 B
C
32 lines
775 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 "fmpr.h"
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void
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fmpr_ulp(fmpr_t u, const fmpr_t x, slong prec)
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{
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if (fmpr_is_special(x))
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{
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fmpr_abs(u, x);
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}
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else
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{
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fmpz_t e;
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fmpz_init(e);
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fmpz_add_ui(e, fmpr_expref(x), fmpz_bits(fmpr_manref(x)));
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fmpz_sub_ui(e, e, prec);
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fmpz_one(fmpr_manref(u));
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fmpz_set(fmpr_expref(u), e);
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fmpz_clear(e);
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}
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}
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