mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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Copyright (C) 2021 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.h"
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static void
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arf_shallow_set_uiui(arf_t res, ulong vhi, ulong vlo)
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{
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unsigned int bc;
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if (vhi == 0)
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{
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if (vlo == 0)
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{
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ARF_XSIZE(res) = 0;
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ARF_EXP(res) = ARF_EXP_ZERO;
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}
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else
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{
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count_leading_zeros(bc, vlo);
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ARF_EXP(res) = FLINT_BITS - bc;
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ARF_NOPTR_D(res)[0] = vlo << bc;
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ARF_XSIZE(res) = ARF_MAKE_XSIZE(1, 0);
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}
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}
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else if (vlo == 0)
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{
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count_leading_zeros(bc, vhi);
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ARF_EXP(res) = 2 * FLINT_BITS - bc;
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ARF_NOPTR_D(res)[0] = vhi << bc;
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ARF_XSIZE(res) = ARF_MAKE_XSIZE(1, 0);
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}
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else
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{
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count_leading_zeros(bc, vhi);
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ARF_EXP(res) = 2 * FLINT_BITS - bc;
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ARF_NOPTR_D(res)[0] = vlo << bc;
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if (bc == 0)
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ARF_NOPTR_D(res)[1] = vhi;
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else
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ARF_NOPTR_D(res)[1] = (vhi << bc) | (vlo >> (FLINT_BITS - bc));
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ARF_XSIZE(res) = ARF_MAKE_XSIZE(2, 0);
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}
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}
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void
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acb_dot_uiui(acb_t res, const acb_t initial, int subtract, acb_srcptr x, slong xstep, const ulong * y, slong ystep, slong len, slong prec)
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{
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arb_ptr t;
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slong i;
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ulong vhi, vlo;
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TMP_INIT;
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/* todo: fast fma and fmma (len=2) code */
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if (len <= 1)
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{
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if (initial == NULL)
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{
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if (len <= 0)
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acb_zero(res);
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else
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{
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arf_t t;
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arf_shallow_set_uiui(t, y[1], y[0]);
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arb_mul_arf(acb_realref(res), acb_realref(x), t, prec);
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arb_mul_arf(acb_imagref(res), acb_imagref(x), t, prec);
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if (subtract)
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acb_neg(res, res);
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}
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return;
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}
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else if (len <= 0)
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{
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acb_set_round(res, initial, prec);
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return;
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}
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}
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TMP_START;
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t = TMP_ALLOC(sizeof(arb_struct) * len);
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for (i = 0; i < len; i++)
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{
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vlo = y[2 * i * ystep];
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vhi = y[2 * i * ystep + 1];
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arf_shallow_set_uiui(arb_midref(t + i), vhi, vlo);
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MAG_EXP(arb_radref(t + i)) = 0;
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MAG_MAN(arb_radref(t + i)) = 0;
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}
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arb_dot(((arb_ptr) res) + 0, (initial == NULL) ? NULL : ((arb_srcptr) initial) + 0, subtract, ((arb_srcptr) x) + 0, 2 * xstep, t, 1, len, prec);
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arb_dot(((arb_ptr) res) + 1, (initial == NULL) ? NULL : ((arb_srcptr) initial) + 1, subtract, ((arb_srcptr) x) + 1, 2 * xstep, t, 1, len, prec);
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TMP_END;
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}
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