1 /*
2 Copyright (C) 2009 William Hart
3
4 This file is part of FLINT.
5
6 FLINT is free software: you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version. See <http://www.gnu.org/licenses/>.
10 */
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <gmp.h>
15 #include "flint.h"
16 #include "ulong_extras.h"
17 #include "fmpz.h"
18
19 int
main(void)20 main(void)
21 {
22 int i, result;
23 FLINT_TEST_INIT(state);
24
25 flint_printf("xgcd_partial....");
26 fflush(stdout);
27
28
29
30 /* Test co2*r1 - co1*r2 = r2_orig */
31 for (i = 0; i < 1000 * flint_test_multiplier(); i++)
32 {
33 fmpz_t co1, co2, f, g, t1, t2, L;
34
35 fmpz_init(co1);
36 fmpz_init(co2);
37 fmpz_init(f);
38 fmpz_init(g);
39 fmpz_init(L);
40 fmpz_init(t1);
41 fmpz_init(t2);
42
43 fmpz_randtest_unsigned(g, state, 200);
44 fmpz_add_ui(g, g, 1);
45 fmpz_randm(f, state, g);
46 fmpz_randtest_unsigned(L, state, 200);
47
48 fmpz_set(t2, g);
49 fmpz_abs(t2, t2);
50
51 fmpz_xgcd_partial(co2, co1, g, f, L);
52
53 fmpz_mul(t1, co2, f);
54 fmpz_submul(t1, co1, g);
55 fmpz_abs(t1, t1);
56
57 result = fmpz_equal(t1, t2);
58 if (!result)
59 {
60 flint_printf("FAIL:\n\n");
61 flint_printf("co1 = "), fmpz_print(co1), flint_printf("\n");
62 flint_printf("co2 = "), fmpz_print(co2), flint_printf("\n");
63 flint_printf("f = "), fmpz_print(f), flint_printf("\n");
64 flint_printf("g = "), fmpz_print(g), flint_printf("\n");
65 flint_printf("L = "), fmpz_print(L), flint_printf("\n");
66 flint_printf("t1 = "), fmpz_print(t1), flint_printf("\n");
67 flint_printf("t2 = "), fmpz_print(t2), flint_printf("\n");
68 abort();
69 }
70
71 fmpz_clear(co1);
72 fmpz_clear(co2);
73 fmpz_clear(f);
74 fmpz_clear(g);
75 fmpz_clear(L);
76 fmpz_clear(t1);
77 fmpz_clear(t2);
78 }
79
80 FLINT_TEST_CLEANUP(state);
81
82 flint_printf("PASS\n");
83 return 0;
84 }
85
86