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https://github.com/vale981/arb
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46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*=============================================================================
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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void
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fmpr_set_mpfr(fmpr_t x, const mpfr_t y)
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{
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if (!mpfr_regular_p(y))
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{
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if (mpfr_zero_p(y)) fmpr_zero(x);
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else if (mpfr_inf_p(y) && mpfr_sgn(y) > 0) fmpr_pos_inf(x);
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else if (mpfr_inf_p(y) && mpfr_sgn(y) < 0) fmpr_neg_inf(x);
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else fmpr_nan(x);
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}
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else
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{
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__mpz_struct * z = _fmpz_promote(fmpr_manref(x));
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fmpz_set_si(fmpr_expref(x), mpfr_get_z_2exp(z, y));
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_fmpz_demote_val(fmpr_manref(x));
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_fmpr_normalise(fmpr_manref(x), fmpr_expref(x), y->_mpfr_prec, FMPR_RND_DOWN);
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}
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}
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