mirror of
https://github.com/vale981/arb
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76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
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/*=============================================================================
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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) 2014 Fredrik Johansson
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******************************************************************************/
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#include "arf.h"
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int
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arf_cmp(const arf_t x, const arf_t y)
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{
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int xs, ys, ec, mc;
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mp_size_t xn, yn;
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mp_srcptr xp, yp;
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if (arf_is_special(x) || arf_is_special(y))
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{
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if (arf_equal(x, y))
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return 0;
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if (arf_is_nan(x) || arf_is_nan(y))
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return 0;
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if (arf_is_zero(y)) return arf_sgn(x);
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if (arf_is_zero(x)) return -arf_sgn(y);
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if (arf_is_pos_inf(x)) return 1;
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if (arf_is_neg_inf(y)) return 1;
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return -1;
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}
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xs = ARF_SGNBIT(x);
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ys = ARF_SGNBIT(y);
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if (xs != ys)
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return xs ? -1 : 1;
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ec = fmpz_cmp(ARF_EXPREF(x), ARF_EXPREF(y));
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if (ec != 0)
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return ((ec < 0) ^ xs) ? -1 : 1;
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ARF_GET_MPN_READONLY(xp, xn, x);
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ARF_GET_MPN_READONLY(yp, yn, y);
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if (xn >= yn)
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mc = mpn_cmp(xp + xn - yn, yp, yn);
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else
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mc = mpn_cmp(xp, yp + yn - xn, xn);
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if (mc != 0)
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return ((mc < 0) ^ xs) ? -1 : 1;
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if (xn != yn)
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return ((xn < yn) ^ xs) ? -1 : 1;
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return 0;
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}
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