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/* Test file for mpfr_modf.
Copyright 2007-2021 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
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-test.h"
static void
check (const char *xis, const char *xfs, const char *xs,
mpfr_prec_t xip, mpfr_prec_t xfp, mpfr_prec_t xp,
int expected_return, mpfr_rnd_t rnd_mode)
{
int inexact;
mpfr_t xi, xf, x;
mpfr_init2 (xi, xip);
mpfr_init2 (xf, xfp);
mpfr_init2 (x, xp);
mpfr_set_str1 (x, xs);
inexact = mpfr_modf (xi, xf, x, rnd_mode);
if (mpfr_cmp_str1 (xi, xis))
{
printf ("mpfr_modf failed for x=%s, rnd=%s\n",
xs, mpfr_print_rnd_mode(rnd_mode));
printf ("got integer value: ");
mpfr_out_str (stdout, 10, 0, xi, MPFR_RNDN);
printf ("\nexpected %s\n", xis);
exit (1);
}
if (mpfr_cmp_str1 (xf, xfs))
{
printf ("mpfr_modf failed for x=%s, rnd=%s\n",
xs, mpfr_print_rnd_mode(rnd_mode));
printf ("got fractional value: ");
mpfr_out_str (stdout, 10, 0, xf, MPFR_RNDN);
printf ("\nexpected %s\n", xfs);
exit (1);
}
if (inexact != expected_return)
{
printf ("mpfr_modf failed for x=%s, rnd=%s\n",
xs, mpfr_print_rnd_mode(rnd_mode));
printf ("got return value: %d, expected %d\n", inexact, expected_return);
exit (1);
}
mpfr_clears (xi, xf, x, (mpfr_ptr) 0);
}
static void
check_nans (void)
{
mpfr_t x, xi, xf;
mpfr_init2 (x, 123);
mpfr_init2 (xi, 123);
mpfr_init2 (xf, 123);
/* nan */
mpfr_set_nan (x);
mpfr_modf (xi, xf, x, MPFR_RNDN);
MPFR_ASSERTN (mpfr_nan_p (xi));
MPFR_ASSERTN (mpfr_nan_p (xf));
/* +inf */
mpfr_set_inf (x, 1);
mpfr_modf (xi, xf, x, MPFR_RNDN);
MPFR_ASSERTN (mpfr_inf_p (xi));
MPFR_ASSERTN (mpfr_sgn (xi) > 0);
MPFR_ASSERTN (mpfr_zero_p (xf));
/* -inf */
mpfr_set_inf (x, -1);
mpfr_modf (xi ,xf, x, MPFR_RNDN);
MPFR_ASSERTN (mpfr_inf_p (xi));
MPFR_ASSERTN (mpfr_sgn (xi) < 0);
MPFR_ASSERTN (mpfr_zero_p (xf));
mpfr_clear (x);
mpfr_clear (xi);
mpfr_clear (xf);
}
static void
check_special_exprange (void)
{
int inexact, ov;
unsigned int eflags, gflags;
mpfr_t xi, xf, x;
mpfr_exp_t emax;
emax = mpfr_get_emax ();
mpfr_init2 (xi, 7);
mpfr_init2 (xf, 7);
mpfr_init2 (x, 8);
mpfr_set_str (x, "0.11111111", 2, MPFR_RNDN);
for (ov = 0; ov <= 1; ov++)
{
const char *s = ov ? "@Inf@" : "1";
if (ov)
set_emax (0);
mpfr_clear_flags ();
inexact = mpfr_modf (xi, xf, x, MPFR_RNDN);
gflags = __gmpfr_flags;
set_emax (emax);
if (MPFR_NOTZERO (xi) || MPFR_IS_NEG (xi) ||
mpfr_cmp_str1 (xf, s) != 0)
{
printf ("Error in check_special_exprange (ov = %d):"
" expected 0 and %s, got\n", ov, s);
mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN);
printf (" and ");
mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN);
printf ("\n");
exit (1);
}
if (inexact != 4)
{
printf ("Bad inexact value in check_special_exprange (ov = %d):"
" expected 4, got %d\n", ov, inexact);
exit (1);
}
eflags = MPFR_FLAGS_INEXACT | (ov ? MPFR_FLAGS_OVERFLOW : 0);
if (gflags != eflags)
{
printf ("Bad flags in check_special_exprange (ov = %d):"
" expected %u, got %u\n", ov, eflags, gflags);
exit (1);
}
}
/* Test if an overflow occurs in mpfr_set for ope >= opq. */
set_emax (MPFR_EMAX_MAX);
mpfr_set_inf (x, 1);
mpfr_nextbelow (x);
mpfr_clear_flags ();
inexact = mpfr_modf (xi, xf, x, MPFR_RNDN);
gflags = __gmpfr_flags;
if (mpfr_cmp_str1 (xi, "@Inf@") != 0 ||
MPFR_NOTZERO (xf) || MPFR_IS_NEG (xf))
{
printf ("Error in check_special_exprange:"
" expected 0 and @Inf@, got\n");
mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN);
printf (" and ");
mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN);
printf ("\n");
exit (1);
}
if (inexact != 1)
{
printf ("Bad inexact value in check_special_exprange:"
" expected 1, got %d\n", inexact);
exit (1);
}
eflags = MPFR_FLAGS_INEXACT | MPFR_FLAGS_OVERFLOW;
if (gflags != eflags)
{
printf ("Bad flags in check_special_exprange:"
" expected %u, got %u\n", eflags, gflags);
exit (1);
}
set_emax (emax);
/* Test if an underflow occurs in the general case. TODO */
mpfr_clears (xi, xf, x, (mpfr_ptr) 0);
}
int
main (int argc, char *argv[])
{
tests_start_mpfr ();
check_nans ();
/* integer part is exact, frac. part is exact: return value should be 0 */
check ("61680","3.52935791015625e-1", "61680.352935791015625",
53, 53, 53, 0, MPFR_RNDZ);
/* integer part is rounded up, fractional part is rounded up: return value
should be 1+4*1=5 */
check ("-53968","-3.529052734375e-1", "-53970.352935791015625",
13, 13, 53, 5, MPFR_RNDZ);
/* integer part is rounded down, fractional part is rounded down:
return value should be 2+4*2=10 */
check ("61632","3.525390625e-1", "61648.352935791015625",
10, 10, 53, 10, MPFR_RNDZ);
check ("61680", "0", "61680", 53, 53, 53, 0, MPFR_RNDZ);
/* integer part is rounded up, fractional part is exact: 1 */
check ("-53968","0", "-53970", 13, 13, 53, 1, MPFR_RNDZ);
/* integer part is rounded up, fractional part is exact: 1 */
check ("-43392","0", "-43399", 13, 13, 53, 1, MPFR_RNDU);
/* integer part is rounded down, fractional part is exact: 2 */
check ("-52720","0", "-52719", 13, 13, 53, 2, MPFR_RNDD);
/* integer part is rounded down, fractional part is exact: 2 */
check ("61632", "0", "61648", 10, 10, 53, 2, MPFR_RNDZ);
check_special_exprange ();
tests_end_mpfr ();
return 0;
}
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