mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
54 lines
1 KiB
C
54 lines
1 KiB
C
/*
|
|
Copyright (C) 2013 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 "acb.h"
|
|
|
|
void
|
|
acb_inv(acb_t z, const acb_t x, slong prec)
|
|
{
|
|
#define a acb_realref(x)
|
|
#define b acb_imagref(x)
|
|
#define c acb_realref(z)
|
|
#define d acb_imagref(z)
|
|
|
|
if (arb_is_zero(b))
|
|
{
|
|
arb_inv(c, a, prec);
|
|
arb_zero(d);
|
|
}
|
|
else if (arb_is_zero(a))
|
|
{
|
|
arb_inv(d, b, prec);
|
|
arb_neg(d, d);
|
|
arb_zero(c);
|
|
}
|
|
else
|
|
{
|
|
arb_t t;
|
|
arb_init(t);
|
|
|
|
arb_mul(t, a, a, prec);
|
|
arb_addmul(t, b, b, prec);
|
|
|
|
arb_div(c, a, t, prec);
|
|
arb_div(d, b, t, prec);
|
|
|
|
arb_neg(d, d);
|
|
|
|
arb_clear(t);
|
|
}
|
|
|
|
#undef a
|
|
#undef b
|
|
#undef c
|
|
#undef d
|
|
}
|
|
|