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/* Test file for mpfr_set_d and mpfr_get_d.
Copyright 1999, 2000, 2001, 2002, 2003 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 <float.h>
#include <time.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"
int
main (int argc, char *argv[])
{
mpfr_t x, y, z;
unsigned long k, n;
double d, dd;
tests_start_mpfr ();
mpfr_test_init ();
mpfr_init2 (x, 2);
/* checks that denormalized are not flushed to zero */
d = DBL_MIN; /* 2^(-1022) */
for (n=0; n<52; n++, d /= 2.0)
if (d != 0.0) /* should be 2^(-1022-n) */
{
mpfr_set_d (x, d, GMP_RNDN);
if (mpfr_cmp_ui_2exp (x, 1, -1022-n))
{
fprintf (stderr, "Wrong result for d=2^(%ld), ", -1022-n);
fprintf (stderr, "got ");
mpfr_out_str (stderr, 10, 10, x, GMP_RNDN);
fprintf (stderr, "\n");
mpfr_print_binary (x); puts ("");
exit (1);
}
}
/* checks that rounds to nearest sets the last
bit to zero in case of equal distance */
mpfr_set_d (x, 5.0, GMP_RNDN);
if (mpfr_get_d1 (x) != 4.0)
{
fprintf (stderr, "Error in tset_d: got %g instead of 4.0\n",
mpfr_get_d1 (x));
exit (1);
}
mpfr_set_d (x, -5.0, GMP_RNDN);
if (mpfr_get_d1 (x) != -4.0)
{
fprintf (stderr, "Error in tset_d: got %g instead of -4.0\n",
mpfr_get_d1 (x));
exit (1);
}
mpfr_set_d (x, 9.84891017624509146344e-01, GMP_RNDU);
if (mpfr_get_d1 (x) != 1.0)
{
fprintf (stderr, "Error in tset_d: got %g instead of 1.0\n",
mpfr_get_d1 (x));
exit (1);
}
mpfr_init2(z, 32);
mpfr_set_d(z, 1.0, 0);
if (mpfr_get_d1 (z) != 1.0) {
mpfr_print_binary(z); puts ("");
printf("Error: 1.0 != 1.0\n"); exit(1);
}
mpfr_set_prec(x, 53); mpfr_init2(y, 53);
mpfr_set_d(x, d=-1.08007920352320089721e+150, 0);
if (mpfr_get_d1 (x) != d) {
mpfr_print_binary(x); puts ("");
printf("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",d,
mpfr_get_d1 (x)); exit(1);
}
SEED_RAND (time(NULL));
mpfr_set_d(x, 8.06294740693074521573e-310, 0);
d = -6.72658901114033715233e-165;
mpfr_set_d(x, d, 0);
if (d != mpfr_get_d1 (x)) {
mpfr_print_binary(x); puts ("");
printf("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",d,
mpfr_get_d1 (x)); exit(1);
}
n = (argc==1) ? 1000000 : atoi(argv[1]);
for (k = 1; k <= n; k++)
{
do
{
d = drand();
}
#ifdef HAVE_DENORMS
while (0);
#else
while (ABS(d) < DBL_MIN);
#endif
mpfr_set_d (x, d, 0);
dd = mpfr_get_d1 (x);
if (d != dd && !(Isnan(d) && Isnan(dd)))
{
fprintf (stderr,
"Mismatch on : %1.18g != %1.18g\n", d, mpfr_get_d1 (x));
mpfr_print_binary (x);
puts ("");
exit (1);
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
tests_end_mpfr ();
return 0;
}
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