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/* Test file for mpfr_pow.
Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include "mpfr-test.h"
int
main (int argc, char *argv[])
{
mpfr_t x, y, z;
mp_prec_t prec, yprec;
mpfr_t t, s;
mp_rnd_t rnd;
int inexact, compare, compare2;
unsigned int n, err;
mp_prec_t p0=2, p1=100;
unsigned int N=25;
tests_start_mpfr ();
mpfr_init (x);
mpfr_init2 (y,sizeof(unsigned long int)*CHAR_BIT);
mpfr_init (z);
mpfr_init (s);
mpfr_init (t);
/* generic test */
for (prec = p0; prec <= p1; prec++)
{
mpfr_set_prec (x, prec);
mpfr_set_prec (s, sizeof(unsigned long int)*CHAR_BIT);
mpfr_set_prec (z, prec);
mpfr_set_prec (t, prec);
yprec = prec + 10;
for (n=0; n<N; n++)
{
mpfr_random (x);
mpfr_random (s);
if (randlimb () % 2)
mpfr_neg (s, s, GMP_RNDN);
rnd = (mp_rnd_t) RND_RAND ();
mpfr_set_prec (y, yprec);
compare = mpfr_pow (y, x, s, rnd);
err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
if (mpfr_can_round (y, err, rnd, rnd, prec))
{
mpfr_set (t, y, rnd);
inexact = mpfr_pow (z, x, s, rnd);
if (mpfr_cmp (t, z))
{
printf ("results differ for x^y with x=");
mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
printf (" y=");
mpfr_out_str (stdout, 2, 0, s, GMP_RNDN);
printf (" prec=%u rnd_mode=%s\n", (unsigned int) prec,
mpfr_print_rnd_mode (rnd));
printf ("got ");
mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
puts ("");
printf ("expected ");
mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
puts ("");
printf ("approx ");
mpfr_print_binary (y);
puts ("");
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)))
{
printf ("Wrong inexact flag for rnd=%s: expected %d, got %d"
"\n", mpfr_print_rnd_mode (rnd), compare, inexact);
printf ("x="); mpfr_print_binary (x); puts ("");
printf ("y="); mpfr_print_binary (y); puts ("");
printf ("t="); mpfr_print_binary (t); puts ("");
exit (1);
}
}
}
}
mpfr_clear (s);
mpfr_clear (t);
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
tests_end_mpfr ();
return 0;
}
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