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https://github.com/vale981/arb
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32 lines
743 B
C
32 lines
743 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 "acb_modular.h"
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void
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psl2z_inv(psl2z_t h, const psl2z_t g)
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{
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if (h != g)
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psl2z_set(h, g);
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if (fmpz_is_zero(&h->c) && fmpz_sgn(&h->a) > 0)
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{
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fmpz_neg(&h->b, &h->b);
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fmpz_swap(&h->d, &h->a);
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}
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else
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{
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fmpz_swap(&h->a, &h->d);
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fmpz_neg(&h->a, &h->a);
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fmpz_neg(&h->d, &h->d);
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}
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}
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