mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
104 lines
2.9 KiB
C
104 lines
2.9 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, 2013 Fredrik Johansson
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******************************************************************************/
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#include "fmprb.h"
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int
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fmprb_contains(const fmprb_t x, const fmprb_t y)
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{
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fmpr_t t;
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fmpr_t u;
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fmpr_struct tmp[4];
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int left_ok, right_ok;
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if (fmprb_is_exact(y))
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return fmprb_contains_fmpr(x, fmprb_midref(y));
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if (fmpr_is_nan(fmprb_midref(y)))
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return fmpr_is_nan(fmprb_midref(x));
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fmpr_init(t);
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fmpr_init(u);
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/* fast check */
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fmpr_sub(t, fmprb_midref(x), fmprb_radref(x), 30, FMPR_RND_CEIL);
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fmpr_sub(u, fmprb_midref(y), fmprb_radref(y), 30, FMPR_RND_FLOOR);
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left_ok = fmpr_cmp(t, u) <= 0;
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/* exact check */
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if (!left_ok)
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{
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fmpr_init(tmp + 0);
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fmpr_init(tmp + 1);
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fmpr_init(tmp + 2);
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fmpr_init(tmp + 3);
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fmpr_set(tmp + 0, fmprb_midref(x));
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fmpr_neg(tmp + 1, fmprb_radref(x));
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fmpr_neg(tmp + 2, fmprb_midref(y));
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fmpr_set(tmp + 3, fmprb_radref(y));
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fmpr_sum(t, tmp, 4, 30, FMPR_RND_DOWN);
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left_ok = fmpr_sgn(t) <= 0;
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fmpr_clear(tmp + 0);
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fmpr_clear(tmp + 1);
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fmpr_clear(tmp + 2);
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fmpr_clear(tmp + 3);
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}
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/* fast check */
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fmpr_add(t, fmprb_midref(x), fmprb_radref(x), 30, FMPR_RND_FLOOR);
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fmpr_add(u, fmprb_midref(y), fmprb_radref(y), 30, FMPR_RND_CEIL);
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right_ok = (fmpr_cmp(t, u) >= 0);
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/* exact check */
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if (!right_ok)
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{
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fmpr_init(tmp + 0);
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fmpr_init(tmp + 1);
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fmpr_init(tmp + 2);
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fmpr_init(tmp + 3);
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fmpr_set(tmp + 0, fmprb_midref(x));
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fmpr_set(tmp + 1, fmprb_radref(x));
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fmpr_neg(tmp + 2, fmprb_midref(y));
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fmpr_neg(tmp + 3, fmprb_radref(y));
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fmpr_sum(t, tmp, 4, 30, FMPR_RND_DOWN);
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right_ok = fmpr_sgn(t) >= 0;
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fmpr_clear(tmp + 0);
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fmpr_clear(tmp + 1);
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fmpr_clear(tmp + 2);
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fmpr_clear(tmp + 3);
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}
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fmpr_clear(t);
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fmpr_clear(u);
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return left_ok && right_ok;
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}
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