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https://github.com/vale981/arb
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60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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Copyright (C) 2012 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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static void
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_fmpr_mul_special(fmpr_t z, const fmpr_t x, const fmpr_t y)
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{
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if (fmpr_is_zero(x))
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{
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if (!fmpr_is_special(y) || fmpr_is_zero(y))
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fmpr_zero(z);
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else
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fmpr_nan(z);
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return;
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}
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if (fmpr_is_zero(y))
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{
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if (!fmpr_is_special(x))
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fmpr_zero(z);
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else
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fmpr_nan(z);
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return;
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}
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if ((fmpr_is_inf(x) && (fmpr_is_inf(y) || !fmpr_is_special(y))) ||
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(fmpr_is_inf(y) && !fmpr_is_special(x)))
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{
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if (fmpr_sgn(x) == fmpr_sgn(y))
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fmpr_pos_inf(z);
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else
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fmpr_neg_inf(z);
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return;
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}
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fmpr_nan(z);
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}
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slong
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fmpr_mul_naive(fmpr_t z, const fmpr_t x, const fmpr_t y, slong prec, fmpr_rnd_t rnd)
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{
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if (fmpr_is_special(x) || fmpr_is_special(y))
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{
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_fmpr_mul_special(z, x, y);
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return FMPR_RESULT_EXACT;
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}
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fmpz_mul(fmpr_manref(z), fmpr_manref(x), fmpr_manref(y));
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fmpz_add(fmpr_expref(z), fmpr_expref(x), fmpr_expref(y));
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return _fmpr_normalise(fmpr_manref(z), fmpr_expref(z), prec, rnd);
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}
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