/* Test file for mpfr_abs.
Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
void check_inexact _PROTO((void));
void
check_inexact (void)
{
mp_prec_t p, q;
mpfr_t x, y, absx;
mp_rnd_t rnd;
int inexact, cmp;
mpfr_init (x);
mpfr_init (y);
mpfr_init (absx);
for (p=2; p<500; p++)
{
mpfr_set_prec (x, p);
mpfr_set_prec (absx, p);
mpfr_random (x);
if (LONG_RAND () % 2)
{
mpfr_set (absx, x, GMP_RNDN);
mpfr_neg (x, x, GMP_RNDN);
}
else
mpfr_set (absx, x, GMP_RNDN);
for (q=2; q<2*p; q++)
{
mpfr_set_prec (y, q);
for (rnd=0; rnd<4; rnd++)
{
inexact = mpfr_abs (y, x, rnd);
cmp = mpfr_cmp (y, absx);
if (((inexact == 0) && (cmp != 0)) ||
((inexact > 0) && (cmp <= 0)) ||
((inexact < 0) && (cmp >= 0)))
{
fprintf (stderr, "Wrong inexact flag: expected %d, got %d\n", cmp, inexact);
printf ("x="); mpfr_print_binary (x); putchar ('\n');
printf ("absx="); mpfr_print_binary (absx); putchar ('\n');
printf ("y="); mpfr_print_binary (y); putchar ('\n');
exit (1);
}
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (absx);
}
int
main (int argc, char *argv[])
{
mpfr_t x;
int n, k, rnd;
double d, absd, dd;
mpfr_test_init ();
check_inexact ();
mpfr_init2(x, 53);
mpfr_set_d(x, 1.0, GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d1 (x) != 1.0) {
fprintf(stderr, "Error in mpfr_abs(1.0)\n"); exit(1);
}
mpfr_set_d(x, -1.0, GMP_RNDN);
mpfr_abs(x, x, GMP_RNDN);
if (mpfr_get_d1 (x) != 1.0) {
fprintf(stderr, "Error in mpfr_abs(-1.0)\n"); exit(1);
}
mpfr_set_inf (x, 1);
mpfr_abs (x, x, GMP_RNDN);
if (!mpfr_inf_p(x) || (mpfr_sgn(x) <= 0))
{
fprintf (stderr, "Error in mpfr_abs(Inf).\n");
exit (1);
}
mpfr_set_inf (x, -1);
mpfr_abs (x, x, GMP_RNDN);
if (!mpfr_inf_p(x) || (mpfr_sgn(x) <= 0))
{
fprintf (stderr, "Error in mpfr_abs(-Inf).\n");
exit (1);
}
n = (argc==1) ? 1000000 : atoi(argv[1]);
for (k = 1; k <= n; k++)
{
do
{
d = drand ();
absd = ABS(d);
}
#ifdef HAVE_DENORMS
while (0);
#else
while (absd <= 2.2e-307);
#endif
rnd = LONG_RAND() % 4;
mpfr_set_d (x, d, 0);
mpfr_abs (x, x, rnd);
dd = mpfr_get_d1 (x);
if (!isnan(d) && (dd != absd))
{
fprintf(stderr,
"Mismatch on d = %.20e\n", d);
fprintf(stderr, "dd=%.20e\n", dd);
mpfr_print_binary(x); putchar('\n');
exit(1);
}
}
mpfr_clear(x);
return 0;
}