/* Test file for mpfr_set_d and mpfr_get_d.
Copyright 1999-2017 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU 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 3 of the License, or (at your
option) any later version.
The GNU 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 GNU MPFR Library; see the file COPYING.LESSER. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <float.h>
#include "mpfr-test.h"
int
main (int argc, char *argv[])
{
mpfr_t x, y, z;
unsigned long k, n;
volatile double d;
double dd;
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
mpfr_init (x);
#if !defined(MPFR_ERRDIVZERO)
mpfr_set_nan (x);
d = mpfr_get_d (x, MPFR_RNDN);
if (! DOUBLE_ISNAN (d))
{
printf ("ERROR for NAN (1)\n");
#ifdef MPFR_NANISNAN
printf ("The reason is that NAN == NAN. Please look at the configure "
"output\nand Section \"In case of problem\" of the INSTALL "
"file.\n");
#endif
exit (1);
}
mpfr_set_ui (x, 0, MPFR_RNDN);
mpfr_set_d (x, d, MPFR_RNDN);
if (! mpfr_nan_p (x))
{
printf ("ERROR for NAN (2)\n");
#ifdef MPFR_NANISNAN
printf ("The reason is that NAN == NAN. Please look at the configure "
"output\nand Section \"In case of problem\" of the INSTALL "
"file.\n");
#endif
exit (1);
}
#endif /* MPFR_ERRDIVZERO */
#ifdef HAVE_SIGNEDZ
d = 0.0;
mpfr_set_d (x, d, MPFR_RNDN);
MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
d = -d;
mpfr_set_d (x, d, MPFR_RNDN);
if (mpfr_cmp_ui (x, 0) != 0 || MPFR_IS_POS(x))
{
printf ("Error in mpfr_set_d on -0\n");
exit (1);
}
#endif /* HAVE_SIGNEDZ */
#if !defined(MPFR_ERRDIVZERO)
mpfr_set_inf (x, 1);
d = mpfr_get_d (x, MPFR_RNDN);
mpfr_set_ui (x, 0, MPFR_RNDN);
mpfr_set_d (x, d, MPFR_RNDN);
MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
mpfr_set_inf (x, -1);
d = mpfr_get_d (x, MPFR_RNDN);
mpfr_set_ui (x, 0, MPFR_RNDN);
mpfr_set_d (x, d, MPFR_RNDN);
MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0);
#endif /* MPFR_ERRDIVZERO */
mpfr_set_prec (x, 2);
/* checks that subnormals 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, MPFR_RNDN);
if (mpfr_cmp_ui_2exp (x, 1, -1022-n))
{
printf ("Wrong result for d=2^(%ld), ", -1022-n);
printf ("got ");
mpfr_out_str (stdout, 10, 10, x, MPFR_RNDN);
printf ("\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, MPFR_RNDN);
if (mpfr_cmp_ui (x, 4))
{
printf ("Error in tset_d: expected 4.0, got ");
mpfr_print_binary (x); putchar('\n');
exit (1);
}
mpfr_set_d (x, -5.0, MPFR_RNDN);
if (mpfr_cmp_si (x, -4))
{
printf ("Error in tset_d: expected -4.0, got ");
mpfr_print_binary (x); putchar('\n');
exit (1);
}
mpfr_set_d (x, 9.84891017624509146344e-01, MPFR_RNDU);
if (mpfr_cmp_ui (x, 1))
{
printf ("Error in tset_d: expected 1.0, got ");
mpfr_print_binary (x); putchar('\n');
exit (1);
}
mpfr_init2 (z, 32);
mpfr_set_d (z, 1.0, (mpfr_rnd_t) 0);
if (mpfr_cmp_ui (z, 1))
{
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, (mpfr_rnd_t) 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);
}
mpfr_set_d (x, 8.06294740693074521573e-310, (mpfr_rnd_t) 0);
d = -6.72658901114033715233e-165;
mpfr_set_d (x, d, (mpfr_rnd_t) 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) ? 500000 : atoi(argv[1]);
for (k = 1; k <= n; k++)
{
do
{
d = DBL_RAND ();
}
#ifdef HAVE_DENORMS
while (0);
#else
while (ABS(d) < DBL_MIN);
#endif
mpfr_set_d (x, d, (mpfr_rnd_t) 0);
dd = mpfr_get_d1 (x);
if (d != dd && !(Isnan(d) && Isnan(dd)))
{
printf ("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;
}