1/* Test file for mpfr_modf.
2
3Copyright 2007-2023 Free Software Foundation, Inc.
4Contributed by the AriC and Caramba projects, INRIA.
5
6This file is part of the GNU MPFR Library.
7
8The GNU MPFR Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MPFR Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
20https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
2151 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23#include "mpfr-test.h"
24
25static void
26check (const char *xis, const char *xfs, const char *xs,
27       mpfr_prec_t xip, mpfr_prec_t xfp, mpfr_prec_t xp,
28       int expected_return, mpfr_rnd_t rnd_mode)
29{
30  int inexact;
31  mpfr_t xi, xf, x;
32
33  mpfr_init2 (xi, xip);
34  mpfr_init2 (xf, xfp);
35  mpfr_init2 (x, xp);
36  mpfr_set_str1 (x, xs);
37  inexact = mpfr_modf (xi, xf, x, rnd_mode);
38  if (mpfr_cmp_str1 (xi, xis))
39    {
40      printf ("mpfr_modf failed for x=%s, rnd=%s\n",
41              xs, mpfr_print_rnd_mode(rnd_mode));
42      printf ("got integer value: ");
43      mpfr_out_str (stdout, 10, 0, xi, MPFR_RNDN);
44      printf ("\nexpected %s\n", xis);
45      exit (1);
46    }
47  if (mpfr_cmp_str1 (xf, xfs))
48    {
49      printf ("mpfr_modf failed for x=%s, rnd=%s\n",
50              xs, mpfr_print_rnd_mode(rnd_mode));
51      printf ("got fractional value: ");
52      mpfr_out_str (stdout, 10, 0, xf, MPFR_RNDN);
53      printf ("\nexpected %s\n", xfs);
54      exit (1);
55    }
56  if (inexact != expected_return)
57    {
58      printf ("mpfr_modf failed for x=%s, rnd=%s\n",
59              xs, mpfr_print_rnd_mode(rnd_mode));
60      printf ("got return value: %d, expected %d\n", inexact, expected_return);
61      exit (1);
62    }
63  mpfr_clears (xi, xf, x, (mpfr_ptr) 0);
64}
65
66static void
67check_nans (void)
68{
69  mpfr_t  x, xi, xf;
70
71  mpfr_init2 (x, 123);
72  mpfr_init2 (xi, 123);
73  mpfr_init2 (xf, 123);
74
75  /* nan */
76  mpfr_set_nan (x);
77  mpfr_modf (xi, xf, x, MPFR_RNDN);
78  MPFR_ASSERTN (mpfr_nan_p (xi));
79  MPFR_ASSERTN (mpfr_nan_p (xf));
80
81  /* +inf */
82  mpfr_set_inf (x, 1);
83  mpfr_modf (xi, xf, x, MPFR_RNDN);
84  MPFR_ASSERTN (mpfr_inf_p (xi));
85  MPFR_ASSERTN (mpfr_sgn (xi) > 0);
86  MPFR_ASSERTN (mpfr_zero_p (xf));
87
88  /* -inf */
89  mpfr_set_inf (x, -1);
90  mpfr_modf (xi, xf, x, MPFR_RNDN);
91  MPFR_ASSERTN (mpfr_inf_p (xi));
92  MPFR_ASSERTN (mpfr_sgn (xi) < 0);
93  MPFR_ASSERTN (mpfr_zero_p (xf));
94
95  mpfr_clear (x);
96  mpfr_clear (xi);
97  mpfr_clear (xf);
98}
99
100static void
101check_special_exprange (void)
102{
103  int inexact, ov;
104  unsigned int eflags, gflags;
105  mpfr_t xi, xf, x;
106  mpfr_exp_t emax;
107
108  emax = mpfr_get_emax ();
109  mpfr_init2 (xi, 7);
110  mpfr_init2 (xf, 7);
111  mpfr_init2 (x, 8);
112
113  mpfr_set_str (x, "0.11111111", 2, MPFR_RNDN);
114  for (ov = 0; ov <= 1; ov++)
115    {
116      const char *s = ov ? "@Inf@" : "1";
117
118      if (ov)
119        set_emax (0);
120      mpfr_clear_flags ();
121      inexact = mpfr_modf (xi, xf, x, MPFR_RNDN);
122      gflags = __gmpfr_flags;
123      set_emax (emax);
124      if (MPFR_NOTZERO (xi) || MPFR_IS_NEG (xi) ||
125          mpfr_cmp_str1 (xf, s) != 0)
126        {
127          printf ("Error in check_special_exprange (ov = %d):"
128                  " expected 0 and %s, got\n", ov, s);
129          mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN);
130          printf (" and ");
131          mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN);
132          printf ("\n");
133          exit (1);
134        }
135      if (inexact != 4)
136        {
137          printf ("Bad inexact value in check_special_exprange (ov = %d):"
138                  " expected 4, got %d\n", ov, inexact);
139          exit (1);
140        }
141      eflags = MPFR_FLAGS_INEXACT | (ov ? MPFR_FLAGS_OVERFLOW : 0);
142      if (gflags != eflags)
143        {
144          printf ("Bad flags in check_special_exprange (ov = %d):"
145                  " expected %u, got %u\n", ov, eflags, gflags);
146          exit (1);
147        }
148    }
149
150  /* Test if an overflow occurs in mpfr_set for ope >= opq. */
151  set_emax (MPFR_EMAX_MAX);
152  mpfr_set_inf (x, 1);
153  mpfr_nextbelow (x);
154  mpfr_clear_flags ();
155  inexact = mpfr_modf (xi, xf, x, MPFR_RNDN);
156  gflags = __gmpfr_flags;
157  if (mpfr_cmp_str1 (xi, "@Inf@") != 0 ||
158      MPFR_NOTZERO (xf) || MPFR_IS_NEG (xf))
159    {
160      printf ("Error in check_special_exprange:"
161              " expected 0 and @Inf@, got\n");
162      mpfr_out_str (stdout, 2, 0, xi, MPFR_RNDN);
163      printf (" and ");
164      mpfr_out_str (stdout, 2, 0, xf, MPFR_RNDN);
165      printf ("\n");
166      exit (1);
167    }
168  if (inexact != 1)
169    {
170      printf ("Bad inexact value in check_special_exprange:"
171              " expected 1, got %d\n", inexact);
172      exit (1);
173    }
174  eflags = MPFR_FLAGS_INEXACT | MPFR_FLAGS_OVERFLOW;
175  if (gflags != eflags)
176    {
177      printf ("Bad flags in check_special_exprange:"
178              " expected %u, got %u\n", eflags, gflags);
179      exit (1);
180    }
181  set_emax (emax);
182
183  /* Test if an underflow occurs in the general case. TODO */
184
185  mpfr_clears (xi, xf, x, (mpfr_ptr) 0);
186}
187
188int
189main (int argc, char *argv[])
190{
191  tests_start_mpfr ();
192
193  check_nans ();
194
195  /* integer part is exact, frac. part is exact: return value should be 0 */
196  check ("61680","3.52935791015625e-1", "61680.352935791015625",
197         53, 53, 53, 0, MPFR_RNDZ);
198  /* integer part is rounded up, fractional part is rounded up: return value
199     should be 1+4*1=5 */
200  check ("-53968","-3.529052734375e-1", "-53970.352935791015625",
201         13, 13, 53, 5, MPFR_RNDZ);
202  /* integer part is rounded down, fractional part is rounded down:
203     return value should be 2+4*2=10 */
204  check ("61632","3.525390625e-1",      "61648.352935791015625",
205         10, 10, 53, 10, MPFR_RNDZ);
206  check ("61680", "0", "61680",  53, 53, 53, 0, MPFR_RNDZ);
207  /* integer part is rounded up, fractional part is exact: 1 */
208  check ("-53968","0", "-53970", 13, 13, 53, 1, MPFR_RNDZ);
209  /* integer part is rounded up, fractional part is exact: 1 */
210  check ("-43392","0", "-43399", 13, 13, 53, 1, MPFR_RNDU);
211  /* integer part is rounded down, fractional part is exact: 2 */
212  check ("-52720","0", "-52719", 13, 13, 53, 2, MPFR_RNDD);
213  /* integer part is rounded down, fractional part is exact: 2 */
214  check ("61632", "0", "61648",  10, 10, 53, 2, MPFR_RNDZ);
215
216  check_special_exprange ();
217
218  tests_end_mpfr ();
219  return 0;
220}
221