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https://github.com/vale981/arb
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63 lines
1.7 KiB
C
63 lines
1.7 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) 2013 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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static __inline__ int sgn(int x)
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{
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return (x > 0) - (x < 0);
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}
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int
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fmpr_cmpabs_2exp_si(const fmpr_t x, slong e)
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{
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slong bc;
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int ret;
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fmpz_t t;
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if (fmpr_is_special(x))
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{
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if (fmpr_is_zero(x)) return -1;
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if (fmpr_is_inf(x)) return 1;
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if (fmpr_is_nan(x)) return 0;
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return -1;
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}
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if (fmpz_is_pm1(fmpr_manref(x)))
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return sgn(fmpz_cmp_si(fmpr_expref(x), e));
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bc = fmpz_bits(fmpr_manref(x));
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fmpz_init(t);
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fmpz_add_si_inline(t, fmpr_expref(x), bc);
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fmpz_sub_si_inline(t, t, e);
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ret = (fmpz_sgn(t) <= 0) ? -1 : 1;
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fmpz_clear(t);
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return ret;
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}
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