1/* Test file for mpfr_can_round.
2
3Copyright 1999, 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
26#include "mpfr-test.h"
27
28#define MAX_LIMB_SIZE 100
29
30static void
31check_round_p (void)
32{
33  mp_limb_t buf[MAX_LIMB_SIZE];
34  mp_size_t n, i;
35  mpfr_prec_t p;
36  mpfr_exp_t err;
37  int r1, r2;
38
39  for (n = 2 ; n <= MAX_LIMB_SIZE ; n++)
40    {
41      /* avoid mpn_random which leaks memory */
42      for (i = 0; i < n; i++)
43        buf[i] = randlimb ();
44      p = randlimb() % ((n-1) * GMP_NUMB_BITS) + MPFR_PREC_MIN;
45      err = p + randlimb () % GMP_NUMB_BITS;
46      r1 = mpfr_round_p (buf, n, err, p);
47      r2 = mpfr_can_round_raw (buf, n, MPFR_SIGN_POS, err,
48                               MPFR_RNDN, MPFR_RNDZ, p);
49      if (r1 != r2)
50        {
51          printf ("mpfr_round_p(%d) != mpfr_can_round(%d)!\n"
52                  "bn = %ld, err0 = %ld, prec = %lu\nbp = ",
53                  r1, r2, n, err, (unsigned long) p);
54          gmp_printf ("%NX\n", buf, n);
55          exit (1);
56        }
57    }
58}
59
60int
61main (void)
62{
63  mpfr_t x;
64  mpfr_prec_t i, j;
65
66  tests_start_mpfr ();
67
68  /* checks that rounds to nearest sets the last
69     bit to zero in case of equal distance */
70  mpfr_init2 (x, 59);
71  mpfr_set_str_binary (x, "-0.10010001010111000011110010111010111110000000111101100111111E663");
72  if (mpfr_can_round (x, 54, MPFR_RNDZ, MPFR_RNDZ, 53) != 0)
73    {
74      printf ("Error (1) in mpfr_can_round\n");
75      exit (1);
76    }
77
78  mpfr_set_str_binary (x, "-Inf");
79  if (mpfr_can_round (x, 2000, MPFR_RNDZ, MPFR_RNDZ, 2000) != 0)
80    {
81      printf ("Error (2) in mpfr_can_round\n");
82      exit (1);
83    }
84
85  mpfr_set_prec (x, 64);
86  mpfr_set_str_binary (x, "0.1011001000011110000110000110001111101011000010001110011000000000");
87  if (mpfr_can_round (x, 65, MPFR_RNDN, MPFR_RNDN, 54))
88    {
89      printf ("Error (3) in mpfr_can_round\n");
90      exit (1);
91    }
92
93  mpfr_set_prec (x, 137);
94  mpfr_set_str_binary (x, "-0.10111001101001010110011000110100111010011101101010010100101100001110000100111111011101010110001010111100100101110111100001000010000000000E-97");
95  if (mpfr_can_round (x, 132, MPFR_RNDU, MPFR_RNDZ, 128) == 0)
96    {
97      printf ("Error (4) in mpfr_can_round\n");
98      exit (1);
99    }
100
101  /* in the following, we can round but cannot determine the inexact flag */
102  mpfr_set_prec (x, 86);
103  mpfr_set_str_binary (x, "-0.11100100010011001111011010100111101010011000000000000000000000000000000000000000000000E-80");
104  if (mpfr_can_round (x, 81, MPFR_RNDU, MPFR_RNDZ, 44) == 0)
105    {
106      printf ("Error (5) in mpfr_can_round\n");
107      exit (1);
108    }
109
110  mpfr_set_prec (x, 62);
111  mpfr_set_str (x, "0.ff4ca619c76ba69", 16, MPFR_RNDZ);
112  for (i = 30; i < 99; i++)
113    for (j = 30; j < 99; j++)
114      {
115        int r1, r2;
116        for (r1 = 0; r1 < MPFR_RND_MAX ; r1++)
117          for (r2 = 0; r2 < MPFR_RND_MAX ; r2++)
118            mpfr_can_round (x, i, (mpfr_rnd_t) r1, (mpfr_rnd_t) r2, j); /* test for assertions */
119      }
120
121  mpfr_clear (x);
122
123  check_round_p ();
124
125  tests_end_mpfr ();
126  return 0;
127}
128