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/* mpfr_modf -- Integral and fractional part.
Copyright 2007-2017 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MPFR Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-impl.h"
#define INEXPOS(y) ((y) == 0 ? 0 : (((y) > 0) ? 1 : 2))
#define INEX(y,z) (INEXPOS(y) | (INEXPOS(z) << 2))
/* Set iop to the integral part of op and fop to its fractional part */
int
mpfr_modf (mpfr_ptr iop, mpfr_ptr fop, mpfr_srcptr op, mpfr_rnd_t rnd_mode)
{
mpfr_exp_t ope;
mpfr_prec_t opq;
int inexi, inexf;
MPFR_LOG_FUNC
(("op[%Pu]=%.*Rg rnd=%d",
mpfr_get_prec (op), mpfr_log_prec, op, rnd_mode),
("iop[%Pu]=%.*Rg fop[%Pu]=%.*Rg",
mpfr_get_prec (iop), mpfr_log_prec, iop,
mpfr_get_prec (fop), mpfr_log_prec, fop));
MPFR_ASSERTN (iop != fop);
if ( MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)) )
{
if (MPFR_IS_NAN (op))
{
MPFR_SET_NAN (iop);
MPFR_SET_NAN (fop);
MPFR_RET_NAN;
}
MPFR_SET_SAME_SIGN (iop, op);
MPFR_SET_SAME_SIGN (fop, op);
if (MPFR_IS_INF (op))
{
MPFR_SET_INF (iop);
MPFR_SET_ZERO (fop);
MPFR_RET (0);
}
else /* op is zero */
{
MPFR_ASSERTD (MPFR_IS_ZERO (op));
MPFR_SET_ZERO (iop);
MPFR_SET_ZERO (fop);
MPFR_RET (0);
}
}
ope = MPFR_GET_EXP (op);
opq = MPFR_PREC (op);
if (ope <= 0) /* 0 < |op| < 1 */
{
inexf = (fop != op) ? mpfr_set (fop, op, rnd_mode) : 0;
MPFR_SET_SAME_SIGN (iop, op);
MPFR_SET_ZERO (iop);
MPFR_RET (INEX(0, inexf));
}
else if (ope >= opq) /* op has no fractional part */
{
inexi = (iop != op) ? mpfr_set (iop, op, rnd_mode) : 0;
MPFR_SET_SAME_SIGN (fop, op);
MPFR_SET_ZERO (fop);
MPFR_RET (INEX(inexi, 0));
}
else /* op has both integral and fractional parts */
{
if (iop != op)
{
inexi = mpfr_rint_trunc (iop, op, rnd_mode);
inexf = mpfr_frac (fop, op, rnd_mode);
}
else
{
MPFR_ASSERTN (fop != op);
inexf = mpfr_frac (fop, op, rnd_mode);
inexi = mpfr_rint_trunc (iop, op, rnd_mode);
}
MPFR_RET (INEX(inexi, inexf));
}
}
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