mirror of
https://github.com/vale981/arb
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57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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Copyright (C) 2012 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 "fmpr.h"
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int
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fmpr_cmpabs(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(x)) return -1;
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if (fmpr_is_zero(y)) return 1;
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if (fmpr_is_inf(x)) return fmpr_is_inf(y) ? 0 : 1;
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if (fmpr_is_inf(y)) return -1;
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return -1;
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}
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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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{
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res = fmpz_cmpabs(fmpr_manref(x), fmpr_manref(y));
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if (res != 0)
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res = (res < 0) ? -1 : 1;
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}
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else
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{
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/* TODO: compare position of top exponents to avoid subtraction */
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xsign = fmpr_sgn(x);
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ysign = fmpr_sgn(y);
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fmpr_init(t);
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if (xsign == ysign)
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fmpr_sub(t, x, y, 2, FMPR_RND_DOWN);
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else
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fmpr_add(t, x, y, 2, FMPR_RND_DOWN);
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res = fmpr_sgn(t) * xsign;
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fmpr_clear(t);
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}
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return res;
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}
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