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/* Test file for mpfr_hypot.
Copyright (C) 2001 Free Software Foundation.
Adapted from tarctan.c.
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 <limits.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
#define TEST_FUNCTION mpfr_hypot
int
main (int argc, char *argv[])
{
unsigned int prec, err, yprec, n, p0 = 2, p1 = 100, N = 100;
mp_rnd_t rnd;
mpfr_t x1, x2, y, z, t;
int inexact, compare, compare2;
mpfr_init (x1);
mpfr_init (x2);
mpfr_init (y);
mpfr_init (z);
mpfr_init (t);
/* thypot prec - perform one random computation with precision prec */
if (argc >= 2)
{
p0 = p1 = atoi (argv[1]);
N = 1;
}
for (prec = p0; prec <= p1; prec++)
{
mpfr_set_prec (x1, prec);
mpfr_set_prec (x2, prec);
mpfr_set_prec (z, prec);
mpfr_set_prec (t, prec);
yprec = prec + 10;
for (n=0; n<N; n++)
{
mpfr_random(x1);
mpfr_random(x2);
if (random() % 2)
mpfr_neg (x1, x1, GMP_RNDN);
if (random() % 2)
mpfr_neg (x2, x2, GMP_RNDN);
rnd = random () % 4;
mpfr_set_prec (y, yprec);
compare =TEST_FUNCTION (y, x1,x2, rnd);
err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
if (mpfr_can_round (y, err, rnd, rnd, prec))
{
mpfr_set (t, y, rnd);
inexact = TEST_FUNCTION (z, x1,x2, rnd);
if (mpfr_cmp (t, z))
{
printf ("results differ for x1=");
mpfr_out_str (stdout, 2, prec, x1, GMP_RNDN);
printf ("\n et x2=");
mpfr_out_str (stdout, 2, prec, x2, GMP_RNDN);
printf (" \n prec=%u rnd_mode=%s\n", prec,
mpfr_print_rnd_mode (rnd));
printf (" got ");
mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
putchar ('\n');
printf (" expected ");
mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
putchar ('\n');
printf (" approximation was ");
mpfr_print_binary (y);
putchar ('\n');
exit (1);
}
compare2 = mpfr_cmp (t, y);
/* if rounding to nearest, cannot know the sign of t - f(x)
because of composed rounding: y = o(f(x)) and t = o(y) */
if ((rnd != GMP_RNDN) && (compare * compare2 >= 0))
compare = compare + compare2;
else
compare = inexact; /* cannot determine sign(t-f(x)) */
if (((inexact == 0) && (compare != 0)) ||
((inexact > 0) && (compare <= 0)) ||
((inexact < 0) && (compare >= 0)))
{
fprintf (stderr, "Wrong inexact flag for rnd=%s: expected %d, got %d\n",
mpfr_print_rnd_mode (rnd), compare, inexact);
printf ("x1="); mpfr_print_binary (x1); putchar ('\n');
printf ("x2="); mpfr_print_binary (x2); putchar ('\n');
printf ("t="); mpfr_print_binary (t); putchar ('\n');
exit (1);
}
}
}
}
mpfr_clear (x1);
mpfr_clear (x2);
mpfr_clear (y);
mpfr_clear (z);
mpfr_clear (t);
return 0;
}
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