82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*=============================================================================
|
|
|
|
This file is part of FLINT.
|
|
|
|
FLINT is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
FLINT is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with FLINT; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2012 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "fmpq.h"
|
|
|
|
int
|
|
_fmpq_cmp(const fmpz_t p, const fmpz_t q, const fmpz_t r, const fmpz_t s)
|
|
{
|
|
int s1, s2, res;
|
|
mp_bitcnt_t bp, bq, br, bs;
|
|
fmpz_t t, u;
|
|
|
|
if (fmpz_equal(q, s))
|
|
return fmpz_cmp(p, r);
|
|
|
|
s1 = fmpz_sgn(p);
|
|
s2 = fmpz_sgn(r);
|
|
|
|
if (s1 != s2)
|
|
return s1 < s2 ? -1 : 1;
|
|
|
|
if (s1 == 0)
|
|
return -s2;
|
|
|
|
if (s2 == 0)
|
|
return -s1;
|
|
|
|
bp = fmpz_bits(p);
|
|
bq = fmpz_bits(q);
|
|
br = fmpz_bits(r);
|
|
bs = fmpz_bits(s);
|
|
|
|
if (bp + bs + 1 < br + bq)
|
|
return -s1;
|
|
|
|
if (bp + bs > br + bq + 1)
|
|
return s1;
|
|
|
|
fmpz_init(t);
|
|
fmpz_init(u);
|
|
|
|
fmpz_mul(t, p, s);
|
|
fmpz_mul(u, q, r);
|
|
|
|
res = fmpz_cmp(t, u);
|
|
|
|
fmpz_clear(t);
|
|
fmpz_clear(u);
|
|
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fmpq_cmp(const fmpq_t x, const fmpq_t y)
|
|
{
|
|
return _fmpq_cmp(fmpq_numref(x), fmpq_denref(x),
|
|
fmpq_numref(y), fmpq_denref(y));
|
|
}
|
|
|