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/* Test file for mpfr_acos.
Copyright 2001-2020 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"
#define TEST_FUNCTION mpfr_acos
#include "tgeneric.c"
static void
special (void)
{
mpfr_t x, y;
int inex1, inex2;
mpfr_init2 (x, 32);
mpfr_init2 (y, 32);
mpfr_set_str_binary (x, "0.10001000001001011000100001E-6");
mpfr_acos (y, x, MPFR_RNDN);
mpfr_set_str_binary (x, "1.10001111111111110001110110001");
if (mpfr_cmp (x, y))
{
printf ("Error in mpfr_acos (1)\n");
exit (1);
}
mpfr_set_str_binary (x, "-0.01101011110111100111010011001011");
mpfr_acos (y, x, MPFR_RNDZ);
mpfr_set_str_binary (x, "10.0000000101111000011101000101");
if (mpfr_cmp (x, y))
{
printf ("Error in mpfr_acos (2)\n");
mpfr_dump (y);
exit (1);
}
mpfr_set_prec (x, 2);
mpfr_set_ui (x, 0, MPFR_RNDN);
inex1 = mpfr_acos (x, x, MPFR_RNDN); /* Pi/2 */
inex2 = mpfr_const_pi (x, MPFR_RNDN);
if (inex1 != inex2)
{
printf ("Error in mpfr_acos (3) for prec=2\n");
exit (1);
}
mpfr_clear (y);
mpfr_clear (x);
}
static void
special_overflow (void)
{
mpfr_t x, y;
mpfr_exp_t emin, emax;
emin = mpfr_get_emin ();
emax = mpfr_get_emax ();
set_emin (-125);
set_emax (128);
mpfr_init2 (x, 24);
mpfr_init2 (y, 48);
mpfr_set_str_binary (x, "0.101100100000000000110100E0");
mpfr_acos (y, x, MPFR_RNDN);
if (mpfr_cmp_str (y, "0.110011010100101111000100111010111011010000001001E0",
2, MPFR_RNDN))
{
printf("Special Overflow error.\n");
mpfr_dump (y);
exit (1);
}
mpfr_clear (y);
mpfr_clear (x);
set_emin (emin);
set_emax (emax);
}
int
main (void)
{
mpfr_t x, y;
int r;
tests_start_mpfr ();
special_overflow ();
special ();
mpfr_init (x);
mpfr_init (y);
MPFR_SET_NAN(x);
mpfr_acos (y, x, MPFR_RNDN);
if (mpfr_nan_p(y) == 0)
{
printf ("Error: acos(NaN) != NaN\n");
exit (1);
}
mpfr_set_ui (x, 2, MPFR_RNDN);
mpfr_acos (y, x, MPFR_RNDN);
if (mpfr_nan_p(y) == 0)
{
printf ("Error: acos(2) != NaN\n");
exit (1);
}
mpfr_set_si (x, -2, MPFR_RNDN);
mpfr_acos (y, x, MPFR_RNDN);
if (mpfr_nan_p(y) == 0)
{
printf ("Error: acos(-2) != NaN\n");
exit (1);
}
/* acos (1) = 0 */
mpfr_set_ui (x, 1, MPFR_RNDN);
mpfr_acos (y, x, MPFR_RNDN);
if (MPFR_NOTZERO (y) || MPFR_IS_NEG (y))
{
printf ("Error: acos(1) != +0.0\n");
exit (1);
}
/* acos (0) = Pi/2 */
for (r = 0; r < MPFR_RND_MAX; r++)
{
mpfr_set_ui (x, 0, MPFR_RNDN); /* exact */
mpfr_acos (y, x, (mpfr_rnd_t) r);
mpfr_const_pi (x, (mpfr_rnd_t) r);
mpfr_div_2ui (x, x, 1, MPFR_RNDN); /* exact */
if (mpfr_cmp (x, y))
{
printf ("Error: acos(0) != Pi/2 for rnd=%s\n",
mpfr_print_rnd_mode ((mpfr_rnd_t) r));
exit (1);
}
}
/* acos (-1) = Pi */
for (r = 0; r < MPFR_RND_MAX; r++)
{
mpfr_set_si (x, -1, MPFR_RNDN); /* exact */
mpfr_acos (y, x, (mpfr_rnd_t) r);
mpfr_const_pi (x, (mpfr_rnd_t) r);
if (mpfr_cmp (x, y))
{
printf ("Error: acos(1) != Pi for rnd=%s\n",
mpfr_print_rnd_mode ((mpfr_rnd_t) r));
exit (1);
}
}
test_generic (MPFR_PREC_MIN, 100, 7);
mpfr_clear (x);
mpfr_clear (y);
data_check ("data/acos", mpfr_acos, "mpfr_acos");
bad_cases (mpfr_acos, mpfr_cos, "mpfr_acos", 0, -40, 2, 4, 128, 800, 30);
tests_end_mpfr ();
return 0;
}
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