1/* Test file for mpfr_set_d and mpfr_get_d.
2
3Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4Contributed by the Arenaire and Cacao 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
20http://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 <stdio.h>
24#include <stdlib.h>
25#include <float.h>
26
27#include "mpfr-test.h"
28
29int
30main (int argc, char *argv[])
31{
32  mpfr_t x, y, z;
33  unsigned long k, n;
34  volatile double d;
35  double dd;
36
37  tests_start_mpfr ();
38  mpfr_test_init ();
39
40#ifndef MPFR_DOUBLE_SPEC
41  printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n"
42          "that you do not have a conforming C implementation and problems\n"
43          "may occur with conversions between MPFR numbers and standard\n"
44          "floating-point types. Please contact the MPFR team.\n");
45#elif MPFR_DOUBLE_SPEC == 0
46  /*
47  printf ("The type 'double' of your C implementation does not seem to\n"
48          "correspond to the IEEE-754 double precision. Though code has\n"
49          "been written to support such implementations, tests have been\n"
50          "done only on IEEE-754 double-precision implementations and\n"
51          "conversions between MPFR numbers and standard floating-point\n"
52          "types may be inaccurate. You may wish to contact the MPFR team\n"
53          "for further testing.\n");
54  */
55  printf ("The type 'double' of your C implementation does not seem to\n"
56          "correspond to the IEEE-754 double precision. Such particular\n"
57          "implementations are not supported yet, and conversions between\n"
58          "MPFR numbers and standard floating-point types may be very\n"
59          "inaccurate.\n");
60  printf ("FLT_RADIX    = %ld\n", (long) FLT_RADIX);
61  printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG);
62  printf ("DBL_MIN_EXP  = %ld\n", (long) DBL_MIN_EXP);
63  printf ("DBL_MAX_EXP  = %ld\n", (long) DBL_MAX_EXP);
64#endif
65
66  mpfr_init (x);
67
68  mpfr_set_nan (x);
69  d = mpfr_get_d (x, MPFR_RNDN);
70  if (! DOUBLE_ISNAN (d))
71    {
72      printf ("ERROR for NAN (1)\n");
73#ifdef MPFR_NANISNAN
74      printf ("The reason is that NAN == NAN. Please look at the configure "
75              "output\nand Section \"In case of problem\" of the INSTALL "
76              "file.\n");
77#endif
78      exit (1);
79    }
80  mpfr_set_ui (x, 0, MPFR_RNDN);
81  mpfr_set_d (x, d, MPFR_RNDN);
82  if (! mpfr_nan_p (x))
83    {
84      printf ("ERROR for NAN (2)\n");
85#ifdef MPFR_NANISNAN
86      printf ("The reason is that NAN == NAN. Please look at the configure "
87              "output\nand Section \"In case of problem\" of the INSTALL "
88              "file.\n");
89#endif
90      exit (1);
91    }
92
93  d = 0.0;
94  mpfr_set_d (x, d, MPFR_RNDN);
95  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
96  d = -d;
97  mpfr_set_d (x, d, MPFR_RNDN);
98  if (mpfr_cmp_ui (x, 0) != 0 || MPFR_IS_POS(x))
99    {
100      printf ("Error in mpfr_set_d on -0\n");
101      exit (1);
102    }
103
104  mpfr_set_inf (x, 1);
105  d = mpfr_get_d (x, MPFR_RNDN);
106  mpfr_set_ui (x, 0, MPFR_RNDN);
107  mpfr_set_d (x, d, MPFR_RNDN);
108  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
109
110  mpfr_set_inf (x, -1);
111  d = mpfr_get_d (x, MPFR_RNDN);
112  mpfr_set_ui (x, 0, MPFR_RNDN);
113  mpfr_set_d (x, d, MPFR_RNDN);
114  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0);
115
116  mpfr_set_prec (x, 2);
117
118  /* checks that denormalized are not flushed to zero */
119  d = DBL_MIN; /* 2^(-1022) */
120  for (n=0; n<52; n++, d /= 2.0)
121    if (d != 0.0) /* should be 2^(-1022-n) */
122      {
123        mpfr_set_d (x, d, MPFR_RNDN);
124        if (mpfr_cmp_ui_2exp (x, 1, -1022-n))
125          {
126            printf ("Wrong result for d=2^(%ld), ", -1022-n);
127            printf ("got ");
128            mpfr_out_str (stdout, 10, 10, x, MPFR_RNDN);
129            printf ("\n");
130            mpfr_print_binary (x);
131            puts ("");
132            exit (1);
133          }
134      }
135
136   /* checks that rounds to nearest sets the last
137     bit to zero in case of equal distance */
138   mpfr_set_d (x, 5.0, MPFR_RNDN);
139   if (mpfr_cmp_ui (x, 4))
140     {
141       printf ("Error in tset_d: expected 4.0, got ");
142       mpfr_print_binary (x); putchar('\n');
143       exit (1);
144     }
145   mpfr_set_d (x, -5.0, MPFR_RNDN);
146   if (mpfr_cmp_si (x, -4))
147     {
148       printf ("Error in tset_d: expected -4.0, got ");
149       mpfr_print_binary (x); putchar('\n');
150       exit (1);
151     }
152
153   mpfr_set_d (x, 9.84891017624509146344e-01, MPFR_RNDU);
154   if (mpfr_cmp_ui (x, 1))
155     {
156       printf ("Error in tset_d: expected 1.0, got ");
157       mpfr_print_binary (x); putchar('\n');
158       exit (1);
159     }
160
161  mpfr_init2 (z, 32);
162  mpfr_set_d (z, 1.0, (mpfr_rnd_t) 0);
163  if (mpfr_cmp_ui (z, 1))
164    {
165      mpfr_print_binary (z); puts ("");
166      printf ("Error: 1.0 != 1.0\n");
167      exit (1);
168    }
169  mpfr_set_prec (x, 53);
170  mpfr_init2 (y, 53);
171  mpfr_set_d (x, d=-1.08007920352320089721e+150, (mpfr_rnd_t) 0);
172  if (mpfr_get_d1 (x) != d)
173    {
174      mpfr_print_binary (x); puts ("");
175      printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",
176              d, mpfr_get_d1 (x));
177      exit (1);
178    }
179
180  mpfr_set_d (x, 8.06294740693074521573e-310, (mpfr_rnd_t) 0);
181  d = -6.72658901114033715233e-165;
182  mpfr_set_d (x, d, (mpfr_rnd_t) 0);
183  if (d != mpfr_get_d1 (x))
184    {
185      mpfr_print_binary (x);
186      puts ("");
187      printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",
188              d, mpfr_get_d1 (x));
189      exit (1);
190    }
191
192  n = (argc==1) ? 500000 : atoi(argv[1]);
193  for (k = 1; k <= n; k++)
194    {
195      do
196        {
197          d = DBL_RAND ();
198        }
199#ifdef HAVE_DENORMS
200      while (0);
201#else
202      while (ABS(d) < DBL_MIN);
203#endif
204      mpfr_set_d (x, d, (mpfr_rnd_t) 0);
205      dd = mpfr_get_d1 (x);
206      if (d != dd && !(Isnan(d) && Isnan(dd)))
207        {
208          printf ("Mismatch on : %1.18g != %1.18g\n", d, mpfr_get_d1 (x));
209          mpfr_print_binary (x);
210          puts ("");
211          exit (1);
212        }
213    }
214
215  mpfr_clear (x);
216  mpfr_clear (y);
217  mpfr_clear (z);
218
219  tests_end_mpfr ();
220  return 0;
221}
222