1/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_fdiv_qr, mpz_fdiv_q,
2   mpz_fdiv_r, mpz_mul.
3
4Copyright 1993, 1994, 1996, 2000, 2001 Free Software Foundation, Inc.
5
6This file is part of the GNU MP Library test suite.
7
8The GNU MP Library test suite is free software; you can redistribute it
9and/or modify it under the terms of the GNU General Public License as
10published by the Free Software Foundation; either version 3 of the License,
11or (at your option) any later version.
12
13The GNU MP Library test suite is distributed in the hope that it will be
14useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
16Public License for more details.
17
18You should have received a copy of the GNU General Public License along with
19the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
20
21#include <stdio.h>
22#include <stdlib.h>
23
24#include "gmp-impl.h"
25#include "tests.h"
26
27void dump_abort (mpz_t, mpz_t);
28void debug_mp (mpz_t, int);
29
30int
31main (int argc, char **argv)
32{
33  mpz_t dividend, divisor;
34  mpz_t quotient, remainder;
35  mpz_t quotient2, remainder2;
36  mpz_t temp;
37  mp_size_t dividend_size, divisor_size;
38  int i;
39  int reps = 1000;
40  gmp_randstate_ptr rands;
41  mpz_t bs;
42  unsigned long bsi, size_range;
43
44  tests_start ();
45  rands = RANDS;
46
47  mpz_init (bs);
48
49  if (argc == 2)
50     reps = atoi (argv[1]);
51
52  mpz_init (dividend);
53  mpz_init (divisor);
54  mpz_init (quotient);
55  mpz_init (remainder);
56  mpz_init (quotient2);
57  mpz_init (remainder2);
58  mpz_init (temp);
59
60  for (i = 0; i < reps; i++)
61    {
62      mpz_urandomb (bs, rands, 32);
63      size_range = mpz_get_ui (bs) % 16 + 2; /* 0..131071 bit operands */
64
65      do
66	{
67	  mpz_urandomb (bs, rands, size_range);
68	  divisor_size = mpz_get_ui (bs);
69	  mpz_rrandomb (divisor, rands, divisor_size);
70	}
71      while (mpz_sgn (divisor) == 0);
72
73      mpz_urandomb (bs, rands, size_range);
74      dividend_size = mpz_get_ui (bs) + divisor_size;
75      mpz_rrandomb (dividend, rands, dividend_size);
76
77      mpz_urandomb (bs, rands, 2);
78      bsi = mpz_get_ui (bs);
79      if ((bsi & 1) != 0)
80	mpz_neg (dividend, dividend);
81      if ((bsi & 2) != 0)
82	mpz_neg (divisor, divisor);
83
84      /* printf ("%ld %ld\n", SIZ (dividend), SIZ (divisor)); */
85
86      mpz_fdiv_qr (quotient, remainder, dividend, divisor);
87      mpz_fdiv_q (quotient2, dividend, divisor);
88      mpz_fdiv_r (remainder2, dividend, divisor);
89
90      /* First determine that the quotients and remainders computed
91	 with different functions are equal.  */
92      if (mpz_cmp (quotient, quotient2) != 0)
93	dump_abort (dividend, divisor);
94      if (mpz_cmp (remainder, remainder2) != 0)
95	dump_abort (dividend, divisor);
96
97      /* Check if the sign of the quotient is correct.  */
98      if (mpz_cmp_ui (quotient, 0) != 0)
99	if ((mpz_cmp_ui (quotient, 0) < 0)
100	    != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
101	dump_abort (dividend, divisor);
102
103      /* Check if the remainder has the same sign as the divisor
104	 (quotient rounded towards minus infinity).  */
105      if (mpz_cmp_ui (remainder, 0) != 0)
106	if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (divisor, 0) < 0))
107	  dump_abort (dividend, divisor);
108
109      mpz_mul (temp, quotient, divisor);
110      mpz_add (temp, temp, remainder);
111      if (mpz_cmp (temp, dividend) != 0)
112	dump_abort (dividend, divisor);
113
114      mpz_abs (temp, divisor);
115      mpz_abs (remainder, remainder);
116      if (mpz_cmp (remainder, temp) >= 0)
117	dump_abort (dividend, divisor);
118    }
119
120  mpz_clear (bs);
121  mpz_clear (dividend);
122  mpz_clear (divisor);
123  mpz_clear (quotient);
124  mpz_clear (remainder);
125  mpz_clear (quotient2);
126  mpz_clear (remainder2);
127  mpz_clear (temp);
128
129  tests_end ();
130  exit (0);
131}
132
133void
134dump_abort (mpz_t dividend, mpz_t divisor)
135{
136  fprintf (stderr, "ERROR\n");
137  fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
138  fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
139  abort();
140}
141
142void
143debug_mp (mpz_t x, int base)
144{
145  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
146}
147