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/* Test file for mpfr_get_d
Copyright 1999, 2000, 2001, 2002 Free Software Foundation.
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 "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
int
main (void)
{
#ifdef HAVE_FENV
mpfr_t half, x, y;
mp_rnd_t rnd_mode;
mpfr_init2(half, 2);
mpfr_set_ui(half, 1, GMP_RNDZ);
mpfr_div_2ui(half, half, 1, GMP_RNDZ); /* has exponent 0 */
mpfr_init2(x, 128);
mpfr_init2(y, 128);
for (rnd_mode = 0; rnd_mode <= 3; rnd_mode++)
{
int i, j, si, sj;
double di, dj;
mpfr_set_machine_rnd_mode (rnd_mode);
for (i = 1, di = 0.25; i < 127; i++, di *= 0.5)
for (si = 0; si <= 1; si++)
{
mpfr_div_2ui(x, half, i, GMP_RNDZ);
(si ? mpfr_sub : mpfr_add)(x, half, x, GMP_RNDZ);
for (j = i+1, dj = di * 0.5; j < 128 && j < i+53; j++, dj *= 0.5)
for (sj = 0; sj <= 1; sj++)
{
double c, d, dd;
int exp;
char *f;
mpfr_div_2ui(y, half, j, GMP_RNDZ);
(sj ? mpfr_sub : mpfr_add)(y, x, y, GMP_RNDZ);
exp = (LONG_RAND() % 47) - 23;
mpfr_mul_2si(y, y, exp, GMP_RNDZ);
if (mpfr_inexflag_p())
{
fprintf(stderr, "Error in tget_d: inexact flag for "
"(i,si,j,sj,rnd,exp) = (%d,%d,%d,%d,%d,%d)\n",
i, si, j, sj, rnd_mode, exp);
exit(1);
}
dd = si != sj ? di - dj : di + dj;
d = si ? 0.5 - dd : 0.5 + dd;
if ((LONG_RAND() / 1024) & 1)
{
c = mpfr_get_d2(y, rnd_mode);
f = "mpfr_get_d2";
}
else
{
exp = (LONG_RAND() % 47) - 23;
c = mpfr_get_d3(y, exp, rnd_mode);
f = "mpfr_get_d3";
if (si) /* then real d < 0.5 */
d *= sj && i == 1 ? 4 : 2; /* normalize real d */
}
if (exp > 0)
d *= 1 << exp;
if (exp < 0)
d /= 1 << -exp;
if (c != d)
{
fprintf (stderr, "Error in tget_d (%s) for "
"(i,si,j,sj,rnd,exp) = (%d,%d,%d,%d,%d,%d)\n"
"got %.25Le instead of %.25Le\n"
"Difference: %.19e\n",
f, i, si, j, sj, rnd_mode, exp,
(long double) c, (long double) d, d - c);
exit (1);
}
}
}
}
mpfr_clear(half);
mpfr_clear(x);
mpfr_clear(y);
#endif
return 0;
}
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