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/* Test file for mpfr_get_d
Copyright 1999, 2000, 2001, 2002, 2003, 2004 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., 51 Franklin Place, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <float.h>
#include "mpfr-test.h"
static int
check_denorms ()
{
mp_rnd_t rnd_mode;
mpfr_t x;
double d, d2, dd, f, dbl_min;
int fail = 0, k, n;
/* workaround for gcc bug on m68040-unknown-netbsd1.4.1,
where DBL_MIN gives (1-2^(-52))/2^1022 */
dbl_min = 1.0;
for (d = DBL_MIN; d < 0.9; d *= 2.0)
dbl_min /= 2.0;
mpfr_init2 (x, BITS_PER_MP_LIMB);
rnd_mode = GMP_RNDN;
for (k = -17; k <= 17; k += 2)
{
d = (double) k * dbl_min; /* k * 2^(-1022) */
f = 1.0;
mpfr_set_si (x, k, GMP_RNDN);
mpfr_div_2exp (x, x, 1022, GMP_RNDN); /* k * 2^(-1022) */
for (n = 0; n <= 58; n++)
{
d2 = d * f;
dd = mpfr_get_d (x, rnd_mode);
if (d2 != dd) /* should be k * 2^(-1022-n) for n < 53 */
{
printf ("Wrong result for %d * 2^(%d), rnd_mode %d\n",
k, -1022-n, rnd_mode);
printf ("got %.20e instead of %.20e\n", dd, d2);
fail = 1;
}
f *= 0.5;
mpfr_div_2exp (x, x, 1, GMP_RNDN);
}
}
mpfr_clear (x);
return fail;
}
static void
check_inf_nan ()
{
/* only if nans and infs are available */
#if _GMP_IEEE_FLOATS
mpfr_t x;
double d;
mpfr_init2 (x, 123);
mpfr_set_inf (x, 1);
d = mpfr_get_d (x, GMP_RNDZ);
ASSERT_ALWAYS (d > 0);
ASSERT_ALWAYS (DOUBLE_ISINF (d));
mpfr_set_inf (x, -1);
d = mpfr_get_d (x, GMP_RNDZ);
ASSERT_ALWAYS (d < 0);
ASSERT_ALWAYS (DOUBLE_ISINF (d));
mpfr_set_nan (x);
d = mpfr_get_d (x, GMP_RNDZ);
ASSERT_ALWAYS (DOUBLE_ISNAN (d));
mpfr_clear (x);
#endif
}
static void
check_max (void)
{
double d, e;
mpfr_t u;
d = 1.0;
while (d < (DBL_MAX / 2.0))
d += d;
mpfr_init (u);
if (mpfr_set_d (u, d, GMP_RNDN) == 0)
{
/* If setting is exact */
e = (mpfr_get_d1) (u);
if (e != d)
{
printf ("get_d(set_d)(1): %1.20e != %1.20e\n", d, e);
exit (1);
}
}
mpfr_set_str_binary (u, "-1E1024");
d = mpfr_get_d (u, GMP_RNDZ);
MPFR_ASSERTN(d == -DBL_MAX);
d = mpfr_get_d (u, GMP_RNDU);
MPFR_ASSERTN(d == -DBL_MAX);
d = mpfr_get_d (u, GMP_RNDN);
MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0);
d = mpfr_get_d (u, GMP_RNDD);
MPFR_ASSERTN(DOUBLE_ISINF(d) && d < 0.0);
mpfr_set_str_binary (u, "1E1024");
d = mpfr_get_d (u, GMP_RNDZ);
MPFR_ASSERTN(d == DBL_MAX);
d = mpfr_get_d (u, GMP_RNDD);
MPFR_ASSERTN(d == DBL_MAX);
d = mpfr_get_d (u, GMP_RNDN);
MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0);
d = mpfr_get_d (u, GMP_RNDU);
MPFR_ASSERTN(DOUBLE_ISINF(d) && d > 0.0);
mpfr_clear (u);
}
static void
check_min(void)
{
double d, e;
mpfr_t u;
d = 1.0; while (d > (DBL_MIN * 2.0)) d /= 2.0;
mpfr_init(u);
if (mpfr_set_d(u, d, GMP_RNDN) == 0)
{
/* If setting is exact */
e = mpfr_get_d1(u);
if (e != d)
{
printf("get_d(set_d)(2): %1.20e != %1.20e\n", d, e);
exit(1);
}
}
mpfr_clear(u);
}
int
main (void)
{
tests_start_mpfr ();
mpfr_test_init ();
#ifndef MPFR_DOUBLE_SPEC
printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n"
"that you do not have a conforming C implementation and problems\n"
"may occur with conversions between MPFR numbers and standard\n"
"floating-point types. Please contact the MPFR team.\n");
#elif MPFR_DOUBLE_SPEC == 0
/*
printf ("The type 'double' of your C implementation does not seem to\n"
"correspond to the IEEE-754 double precision. Though code has\n"
"been written to support such implementations, tests have been\n"
"done only on IEEE-754 double-precision implementations and\n"
"conversions between MPFR numbers and standard floating-point\n"
"types may be inaccurate. You may wish to contact the MPFR team\n"
"for further testing.\n");
*/
printf ("The type 'double' of your C implementation does not seem to\n"
"correspond to the IEEE-754 double precision. Such particular\n"
"implementations are not supported yet, and conversions between\n"
"MPFR numbers and standard floating-point types may be very\n"
"inaccurate.\n");
printf ("FLT_RADIX = %ld\n", (long) FLT_RADIX);
printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG);
printf ("DBL_MIN_EXP = %ld\n", (long) DBL_MIN_EXP);
printf ("DBL_MAX_EXP = %ld\n", (long) DBL_MAX_EXP);
#endif
if (check_denorms ())
exit (1);
check_inf_nan ();
check_min();
check_max();
tests_end_mpfr ();
return 0;
}
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