mirror of
https://github.com/vale981/arb
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85 lines
2.6 KiB
C
85 lines
2.6 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, 2014 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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long
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fmpr_mul(fmpr_t z, const fmpr_t x, const fmpr_t y, long prec, fmpr_rnd_t rnd)
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{
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fmpz xv, yv;
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if (fmpr_is_special(x) || fmpr_is_special(y))
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{
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if (fmpr_is_zero(x) && fmpr_is_finite(y))
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{
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fmpr_zero(z);
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}
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else if (fmpr_is_zero(y) && fmpr_is_finite(x))
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{
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fmpr_zero(z);
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}
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else 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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}
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else
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{
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fmpr_nan(z);
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}
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return FMPR_RESULT_EXACT;
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}
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xv = *fmpr_manref(x);
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yv = *fmpr_manref(y);
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if (!COEFF_IS_MPZ(xv) && !COEFF_IS_MPZ(yv))
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{
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return _fmpr_mul_1x1(z, FLINT_ABS(xv), fmpr_expref(x),
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FLINT_ABS(yv), fmpr_expref(y), (xv ^ yv) < 0, prec, rnd);
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}
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else
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{
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long xn, yn;
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int xsign, ysign;
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mp_limb_t xtmp, ytmp;
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mp_ptr xptr, yptr;
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FMPZ_GET_MPN_READONLY(xsign, xn, xptr, xtmp, xv)
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FMPZ_GET_MPN_READONLY(ysign, yn, yptr, ytmp, yv)
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if (xn >= yn)
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return _fmpr_mul_mpn(z, xptr, xn, fmpr_expref(x),
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yptr, yn, fmpr_expref(y), xsign ^ ysign, prec, rnd);
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else
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return _fmpr_mul_mpn(z, yptr, yn, fmpr_expref(y),
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xptr, xn, fmpr_expref(x), ysign ^ xsign, prec, rnd);
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}
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}
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