Annotation of OpenXM_contrib/gmp/tests/mpz/t-sizeinbase.c, Revision 1.1.1.1
1.1 ohara 1: /* Test mpz_sizeinbase.
2:
3: Copyright 2001, 2002 Free Software Foundation, Inc.
4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Lesser General Public License as published by
9: the Free Software Foundation; either version 2.1 of the License, or (at your
10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Lesser General Public License
18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include <stdio.h>
23: #include <stdlib.h>
24: #include "gmp.h"
25: #include "gmp-impl.h"
26: #include "tests.h"
27:
28:
29: /* Create a fake mpz consisting of just a single 1 bit, with totbits being
30: the total number of bits, inclusive of that 1 bit. */
31: void
32: mpz_fake_bits (mpz_ptr z, unsigned long totbits)
33: {
34: static mp_limb_t n;
35: unsigned long zero_bits, zero_limbs;
36:
37: zero_bits = totbits - 1;
38: zero_limbs = zero_bits / GMP_NUMB_BITS;
39: zero_bits %= GMP_NUMB_BITS;
40:
41: SIZ(z) = zero_limbs + 1;
42: PTR(z) = (&n) - (SIZ(z) - 1);
43: n = CNST_LIMB(1) << zero_bits;
44:
45: ASSERT_ALWAYS (mpz_sizeinbase (z, 2) == totbits);
46: }
47:
48:
49: /* This was seen to fail on a GNU/Linux powerpc32 with gcc 2.95.2,
50: apparently due to a doubtful value of mp_bases[10].chars_per_bit_exactly
51: (0X1.34413509F79FDP-2 whereas 0X1.34413509F79FFP-2 is believed correct).
52: Presumably this is a glibc problem when gcc converts the decimal string
53: in mp_bases.c, or maybe it's only a function of the rounding mode during
54: compilation. */
55: void
56: check_sample (void)
57: {
58: unsigned long totbits = 198096465;
59: int base = 10;
60: size_t want = 59632979;
61: size_t got;
62: mpz_t z;
63:
64: mpz_fake_bits (z, totbits);
65: got = mpz_sizeinbase (z, base);
66: if (got != want)
67: {
68: printf ("mpz_sizeinbase\n");
69: printf (" base %d\n", base);
70: printf (" totbits %lu\n", totbits);
71: printf (" got %u\n", got);
72: printf (" want %u\n", want);
73: abort ();
74: }
75: }
76:
77:
78: int
79: main (void)
80: {
81: tests_start ();
82:
83: /* Disabled due to the bogosity of trying to fake an _mp_d pointer to
84: below an object. Has been seen to fail on a hppa system. */
85:
86: /* check_sample (); */
87:
88: tests_end ();
89: exit (0);
90: }
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