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https://github.com/vale981/arb
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67 lines
2 KiB
C
67 lines
2 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 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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int
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fmpr_cmp(const fmpr_t x, const fmpr_t y)
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{
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int res, xsign, ysign;
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fmpr_t t;
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if (fmpr_equal(x, y))
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return 0;
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if (fmpr_is_special(x) || fmpr_is_special(y))
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{
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if (fmpr_is_nan(x) || fmpr_is_nan(y))
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return 0;
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if (fmpr_is_zero(y)) return fmpr_sgn(x);
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if (fmpr_is_zero(x)) return -fmpr_sgn(y);
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if (fmpr_is_pos_inf(x)) return 1;
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if (fmpr_is_neg_inf(y)) return 1;
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return -1;
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}
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xsign = fmpr_sgn(x);
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ysign = fmpr_sgn(y);
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if (xsign != ysign)
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return (xsign < 0) ? -1 : 1;
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/* Reduces to integer comparison if bottom exponents are the same */
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if (fmpz_equal(fmpr_expref(x), fmpr_expref(y)))
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return fmpz_cmp(fmpr_manref(x), fmpr_manref(y)) < 0 ? -1 : 1;
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/* TODO: compare position of top exponents to avoid subtraction */
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fmpr_init(t);
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fmpr_sub(t, x, y, 2, FMPR_RND_DOWN);
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res = fmpr_sgn(t);
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fmpr_clear(t);
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return res;
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}
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