1/* Test mpf_mul, mpf_div, mpf_ui_div, and mpf_div_ui.
2
3Copyright 1996, 2000, 2001, 2003 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include <stdio.h>
21#include <stdlib.h>
22
23#include "gmp.h"
24#include "gmp-impl.h"
25#include "tests.h"
26
27#ifndef SIZE
28#define SIZE 16
29#endif
30
31int
32main (int argc, char **argv)
33{
34  mp_size_t size;
35  mp_exp_t exp;
36  int reps = 10000;
37  int i;
38  mpf_t u, v, w, x;
39  mp_size_t bprec = SIZE * GMP_LIMB_BITS;
40  mpf_t rerr, limit_rerr;
41  unsigned long ulimb, vlimb;
42  int single_flag;
43
44  tests_start ();
45
46  if (argc > 1)
47    {
48      reps = strtol (argv[1], 0, 0);
49      if (argc > 2)
50	bprec = strtol (argv[2], 0, 0);
51    }
52
53  mpf_set_default_prec (bprec);
54
55  mpf_init (rerr);
56  mpf_init (limit_rerr);
57
58  mpf_init (u);
59  mpf_init (v);
60  mpf_init (w);
61  mpf_init (x);
62
63  for (i = 0; i < reps; i++)
64    {
65      mp_size_t res_prec;
66
67      res_prec = urandom () % bprec + 1;
68      mpf_set_prec (w, res_prec);
69      mpf_set_prec (x, res_prec);
70
71      mpf_set_ui (limit_rerr, 1);
72      mpf_div_2exp (limit_rerr, limit_rerr, res_prec - 1);
73
74      single_flag = 0;
75
76      if ((urandom () & 1) != 0)
77	{
78	  size = urandom () % (2 * SIZE) - SIZE;
79	  exp = urandom () % SIZE;
80	  mpf_random2 (u, size, exp);
81	}
82      else
83	{
84	  ulimb = urandom ();
85	  mpf_set_ui (u, ulimb);
86	  single_flag = 1;
87	}
88
89      if ((urandom () & 1) != 0)
90	{
91	  size = urandom () % (2 * SIZE) - SIZE;
92	  exp = urandom () % SIZE;
93	  mpf_random2 (v, size, exp);
94	}
95      else
96	{
97	  vlimb = urandom ();
98	  mpf_set_ui (v, vlimb);
99	  single_flag = 2;
100	}
101
102      if (mpf_sgn (v) == 0)
103	continue;
104
105      mpf_div (w, u, v);
106      mpf_mul (x, w, v);
107      mpf_reldiff (rerr, u, x);
108      if (mpf_cmp (rerr, limit_rerr) > 0)
109	{
110	  printf ("ERROR in mpf_mul or mpf_div after %d tests\n", i);
111	  printf ("   u = "); mpf_dump (u);
112	  printf ("   v = "); mpf_dump (v);
113	  printf ("   x = "); mpf_dump (x);
114	  printf ("   w = "); mpf_dump (w);
115	  abort ();
116	}
117
118      if (single_flag == 2)
119	{
120	  mpf_div_ui (x, u, vlimb);
121	  mpf_reldiff (rerr, w, x);
122	  if (mpf_cmp (rerr, limit_rerr) > 0)
123	    {
124	      printf ("ERROR in mpf_div or mpf_div_ui after %d tests\n", i);
125	      printf ("   u = "); mpf_dump (u);
126	      printf ("   v = "); mpf_dump (v);
127	      printf ("   x = "); mpf_dump (x);
128	      printf ("   w = "); mpf_dump (w);
129	      abort ();
130	    }
131	}
132
133      if (single_flag == 1)
134	{
135	  mpf_ui_div (x, ulimb, v);
136	  mpf_reldiff (rerr, w, x);
137	  if (mpf_cmp (rerr, limit_rerr) > 0)
138	    {
139	      printf ("ERROR in mpf_div or mpf_ui_div after %d tests\n", i);
140	      printf ("   u = "); mpf_dump (u);
141	      printf ("   v = "); mpf_dump (v);
142	      printf ("   x = "); mpf_dump (x);
143	      printf ("   w = "); mpf_dump (w);
144	      abort ();
145	    }
146	}
147    }
148
149  mpf_clear (rerr);
150  mpf_clear (limit_rerr);
151
152  mpf_clear (u);
153  mpf_clear (v);
154  mpf_clear (w);
155  mpf_clear (x);
156
157  tests_end ();
158  exit (0);
159}
160