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/*
Copyright (C) 2014 Fredrik Johansson
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "fmpr.h"
void
fmpr_ulp(fmpr_t u, const fmpr_t x, slong prec)
{
if (fmpr_is_special(x))
{
fmpr_abs(u, x);
}
else
{
fmpz_t e;
fmpz_init(e);
fmpz_add_ui(e, fmpr_expref(x), fmpz_bits(fmpr_manref(x)));
fmpz_sub_ui(e, e, prec);
fmpz_one(fmpr_manref(u));
fmpz_set(fmpr_expref(u), e);
fmpz_clear(e);
}
}
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