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/* Test file for mpfr_d_sub
Copyright 2007, 2008 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.
This file is part of the MPFR Library.
The 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 2.1 of the License, or (at your
option) any later version.
The 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 MPFR 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 <stdio.h>
#include <stdlib.h>
#include <float.h>
#include "mpfr-test.h"
#if MPFR_VERSION >= MPFR_VERSION_NUM(2,4,0)
static void
check_nans (void)
{
mpfr_t x, y;
mpfr_init2 (x, 123);
mpfr_init2 (y, 123);
/* 1.0 - nan is nan */
mpfr_set_nan (x);
mpfr_d_sub (y, 1.0, x, GMP_RNDN);
MPFR_ASSERTN (mpfr_nan_p (y));
/* 1.0 - +inf == -inf */
mpfr_set_inf (x, 1);
mpfr_d_sub (y, 1.0, x, GMP_RNDN);
MPFR_ASSERTN (mpfr_inf_p (y));
MPFR_ASSERTN (mpfr_sgn (y) < 0);
/* 1.0 - -inf == +inf */
mpfr_set_inf (x, -1);
mpfr_d_sub (y, 1.0, x, GMP_RNDN);
MPFR_ASSERTN (mpfr_inf_p (y));
MPFR_ASSERTN (mpfr_sgn (y) > 0);
mpfr_clear (x);
mpfr_clear (y);
}
#define TEST_FUNCTION mpfr_d_sub
#define DOUBLE_ARG1
#define RAND_FUNCTION(x) mpfr_random2(x, MPFR_LIMB_SIZE (x), 1)
#include "tgeneric.c"
int
main (int argc, char *argv[])
{
mpfr_t x, y, z;
double d;
int inexact;
tests_start_mpfr ();
/* check with enough precision */
mpfr_init2 (x, IEEE_DBL_MANT_DIG);
mpfr_init2 (y, IEEE_DBL_MANT_DIG);
mpfr_init2 (z, IEEE_DBL_MANT_DIG);
mpfr_set_str (y, "4096", 10, GMP_RNDN);
d = 0.125;
mpfr_clear_flags ();
inexact = mpfr_d_sub (x, d, y, GMP_RNDN);
if (inexact != 0)
{
printf ("Inexact flag error in mpfr_d_sub\n");
exit (1);
}
mpfr_set_str (z, "-4095.875", 10, GMP_RNDN);
if (mpfr_cmp (z, x))
{
printf ("Error in mpfr_d_sub (");
mpfr_out_str (stdout, 10, 7, y, GMP_RNDN);
printf (" + %.20g)\nexpected ", d);
mpfr_out_str (stdout, 10, 0, z, GMP_RNDN);
printf ("\ngot ");
mpfr_out_str (stdout, 10, 0, x, GMP_RNDN);
printf ("\n");
exit (1);
}
mpfr_clears (x, y, z, (void *)0);
check_nans ();
test_generic (2, 1000, 100);
tests_end_mpfr ();
return 0;
}
#else
int
main (void)
{
printf ("Warning! Test disabled for this MPFR version.\n");
return 0;
}
#endif
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