106 lines
2.9 KiB
C
106 lines
2.9 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) 2011 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "fmpq.h"
|
|
|
|
void
|
|
_fmpq_mul(fmpz_t rnum, fmpz_t rden, const fmpz_t op1num, const fmpz_t op1den,
|
|
const fmpz_t op2num, const fmpz_t op2den)
|
|
{
|
|
/* Common special cases: squaring, same denominator (e.g. both integers) */
|
|
if (((op1num == op2num) && (op1den == op2den)) ||
|
|
fmpz_equal(op1den, op2den))
|
|
{
|
|
fmpz_mul(rnum, op1num, op2num);
|
|
fmpz_mul(rden, op1den, op2den);
|
|
}
|
|
/* Exactly one argument is an integer */
|
|
else if (fmpz_is_one(op1den))
|
|
{
|
|
fmpz_t t, x;
|
|
fmpz_init(t);
|
|
fmpz_init(x);
|
|
|
|
fmpz_gcd(t, op1num, op2den);
|
|
fmpz_divexact(x, op1num, t);
|
|
fmpz_mul(rnum, x, op2num);
|
|
fmpz_divexact(t, op2den, t);
|
|
fmpz_mul(rden, op1den, t);
|
|
|
|
fmpz_clear(t);
|
|
fmpz_clear(x);
|
|
}
|
|
else if (fmpz_is_one(op2den))
|
|
{
|
|
fmpz_t t, x;
|
|
fmpz_init(t);
|
|
fmpz_init(x);
|
|
|
|
fmpz_gcd(t, op2num, op1den);
|
|
fmpz_divexact(x, op2num, t);
|
|
fmpz_mul(rnum, x, op1num);
|
|
fmpz_divexact(t, op1den, t);
|
|
fmpz_mul(rden, op2den, t);
|
|
|
|
fmpz_clear(t);
|
|
fmpz_clear(x);
|
|
}
|
|
else
|
|
{
|
|
fmpz_t t, u, x, y;
|
|
|
|
fmpz_init(t);
|
|
fmpz_init(u);
|
|
fmpz_init(x);
|
|
fmpz_init(y);
|
|
|
|
fmpz_gcd(t, op1num, op2den);
|
|
fmpz_gcd(u, op1den, op2num);
|
|
|
|
fmpz_divexact(x, op1num, t);
|
|
fmpz_divexact(y, op2num, u);
|
|
|
|
fmpz_mul(rnum, x, y);
|
|
|
|
fmpz_divexact(x, op1den, u);
|
|
fmpz_divexact(y, op2den, t);
|
|
|
|
fmpz_mul(rden, x, y);
|
|
|
|
fmpz_clear(t);
|
|
fmpz_clear(u);
|
|
fmpz_clear(x);
|
|
fmpz_clear(y);
|
|
}
|
|
}
|
|
|
|
|
|
void fmpq_mul(fmpq_t res, const fmpq_t op1, const fmpq_t op2)
|
|
{
|
|
_fmpq_mul(fmpq_numref(res), fmpq_denref(res),
|
|
fmpq_numref(op1), fmpq_denref(op1),
|
|
fmpq_numref(op2), fmpq_denref(op2));
|
|
}
|