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/* put_q.c -- Convex hull of an interval and a rational number.
Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2010,
Spaces project, Inria Lorraine
and Salsa project, INRIA Rocquencourt,
and Arenaire project, Inria Rhone-Alpes, France
and Lab. ANO, USTL (Univ. of Lille), France
This file is part of the MPFI Library.
The MPFI 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 2.1 of the License, or (at your
option) any later version.
The MPFI 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 MPFI Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "mpfi-impl.h"
int
mpfi_put_q (mpfi_ptr a, mpq_srcptr b)
{
int inexact_left = 0;
int inexact_right = 0;
int inexact = 0;
if ( MPFI_NAN_P (a) )
MPFR_RET_NAN;
if (mpfr_cmp_q (&(a->left), b) > 0 ) {
inexact_left = mpfr_set_q (&(a->left), b, MPFI_RNDD);
}
else if (mpfr_cmp_q (&(a->right), b) < 0 ) {
inexact_right = mpfr_set_q (&(a->right), b, MPFI_RNDU);
/* do not allow +0 as upper bound */
if (mpfr_zero_p (&(a->right)) && !mpfr_signbit (&(a->right))) {
mpfr_neg (&(a->right), &(a->right), MPFI_RNDD);
}
}
if (inexact_left)
inexact += 1;
if (inexact_right)
inexact += 2;
return inexact;
}
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