1 /* Test mpf_ui_div.
2
3 Copyright 2004 Free Software Foundation, Inc.
4
5 This file is part of the GNU MP Library test suite.
6
7 The GNU MP Library test suite is free software; you can redistribute it
8 and/or modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 3 of the License,
10 or (at your option) any later version.
11
12 The GNU MP Library test suite is distributed in the hope that it will be
13 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 Public License for more details.
16
17 You should have received a copy of the GNU General Public License along with
18 the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include "gmp-impl.h"
23 #include "tests.h"
24
25
26 void
check_one(const char * desc,mpf_ptr got,unsigned long u,mpf_srcptr v)27 check_one (const char *desc, mpf_ptr got, unsigned long u, mpf_srcptr v)
28 {
29 mpf_t uf;
30 mp_limb_t ulimbs[2];
31 mp_size_t usize;
32
33 ulimbs[0] = u & GMP_NUMB_MASK;
34 usize = (u != 0);
35 #if BITS_PER_ULONG > GMP_NUMB_BITS
36 u >>= GMP_NUMB_BITS;
37 ulimbs[1] = u;
38 usize += (u != 0);
39 #endif
40 PTR(uf) = ulimbs;
41 SIZ(uf) = usize;
42 EXP(uf) = usize;
43
44 if (! refmpf_validate_division ("mpf_ui_div", got, uf, v))
45 {
46 mp_trace_base = -16;
47 printf (" u 0x%lX (%lu)\n", u, u);
48 mpf_trace (" v", v);
49 printf (" %s\n", desc);
50 abort ();
51 }
52 }
53
54 void
check_rand(void)55 check_rand (void)
56 {
57 unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
58 gmp_randstate_ptr rands = RANDS;
59 unsigned long prec, u;
60 mpf_t got, v;
61 int i;
62
63 mpf_init (got);
64 mpf_init (v);
65
66 for (i = 0; i < 200; i++)
67 {
68 /* got precision */
69 prec = min_prec + gmp_urandomm_ui (rands, 15L);
70 refmpf_set_prec_limbs (got, prec);
71
72 /* u */
73 prec = gmp_urandomm_ui (rands, BITS_PER_ULONG+1);
74 u = gmp_urandomb_ui (rands, prec);
75
76 /* v precision */
77 prec = min_prec + gmp_urandomm_ui (rands, 15L);
78 refmpf_set_prec_limbs (v, prec);
79
80 /* v, non-zero */
81 do {
82 mpf_random2 (v, PREC(v), (mp_exp_t) 20);
83 } while (SIZ(v) == 0);
84
85 /* v possibly negative */
86 if (gmp_urandomb_ui (rands, 1L))
87 mpf_neg (v, v);
88
89 if ((i % 2) == 0)
90 {
91 /* src != dst */
92 mpf_ui_div (got, u, v);
93 check_one ("separate", got, u, v);
94 }
95 else
96 {
97 /* src == dst */
98 prec = refmpf_set_overlap (got, v);
99 mpf_ui_div (got, u, got);
100 check_one ("overlap src==dst", got, u, v);
101
102 mpf_set_prec_raw (got, prec);
103 }
104 }
105
106 mpf_clear (got);
107 mpf_clear (v);
108 }
109
110 void
check_various(void)111 check_various (void)
112 {
113 mpf_t got, v;
114
115 mpf_init (got);
116 mpf_init (v);
117
118 /* 100/4 == 25 */
119 mpf_set_prec (got, 20L);
120 mpf_set_ui (v, 4L);
121 mpf_ui_div (got, 100L, v);
122 MPF_CHECK_FORMAT (got);
123 ASSERT_ALWAYS (mpf_cmp_ui (got, 25L) == 0);
124
125 {
126 /* 1/(2^n+1), a case where truncating the divisor would be wrong */
127 unsigned long u = 1L;
128 mpf_set_prec (got, 500L);
129 mpf_set_prec (v, 900L);
130 mpf_set_ui (v, 1L);
131 mpf_mul_2exp (v, v, 800L);
132 mpf_add_ui (v, v, 1L);
133 mpf_ui_div (got, u, v);
134 check_one ("1/2^n+1, separate", got, u, v);
135 }
136
137 mpf_clear (got);
138 mpf_clear (v);
139 }
140
141 int
main(void)142 main (void)
143 {
144 tests_start ();
145
146 check_various ();
147 check_rand ();
148
149 tests_end ();
150 exit (0);
151 }
152