mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
79 lines
1.8 KiB
C
79 lines
1.8 KiB
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 "arf.h"
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int
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arf_mul_via_mpfr(arf_t z, const arf_t x, const arf_t y,
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slong prec, arf_rnd_t rnd)
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{
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mp_size_t xn, yn, zn, val;
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mp_srcptr xptr, yptr;
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mp_ptr tmp, zptr;
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mpfr_t xf, yf, zf;
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int ret;
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ARF_MUL_TMP_DECL
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if (arf_is_special(x) || arf_is_special(y))
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{
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arf_mul_special(z, x, y);
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return 0;
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}
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ARF_GET_MPN_READONLY(xptr, xn, x);
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ARF_GET_MPN_READONLY(yptr, yn, y);
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prec = FLINT_MIN((xn + yn) * FLINT_BITS, prec);
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zn = (prec + FLINT_BITS - 1) / FLINT_BITS;
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ARF_MUL_TMP_ALLOC(tmp, zn)
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zf->_mpfr_d = tmp;
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zf->_mpfr_prec = prec;
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zf->_mpfr_sign = 1;
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zf->_mpfr_exp = 0;
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xf->_mpfr_d = (mp_ptr) xptr;
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xf->_mpfr_prec = xn * FLINT_BITS;
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xf->_mpfr_sign = ARF_SGNBIT(x) ? -1 : 1;
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xf->_mpfr_exp = 0;
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if (x == y)
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{
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ret = mpfr_sqr(zf, xf, arf_rnd_to_mpfr(rnd));
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}
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else
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{
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yf->_mpfr_d = (mp_ptr) yptr;
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yf->_mpfr_prec = yn * FLINT_BITS;
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yf->_mpfr_sign = ARF_SGNBIT(y) ? -1 : 1;
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yf->_mpfr_exp = 0;
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ret = mpfr_mul(zf, xf, yf, arf_rnd_to_mpfr(rnd));
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}
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ret = (ret != 0);
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_fmpz_add2_fast(ARF_EXPREF(z), ARF_EXPREF(x), ARF_EXPREF(y), zf->_mpfr_exp);
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val = 0;
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while (tmp[val] == 0)
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val++;
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ARF_GET_MPN_WRITE(zptr, zn - val, z);
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flint_mpn_copyi(zptr, tmp + val, zn - val);
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ARF_XSIZE(z) |= (zf->_mpfr_sign < 0);
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ARF_MUL_TMP_FREE(tmp, zn)
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return ret;
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}
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