1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
Copyright 1999, 2001, 2002, 2003 Free Software Foundation.
Contributed by the Spaces project, INRIA Lorraine.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
##############################################################################
Probably many bugs.
Known bugs:
* The overflows/underflows are not yet implemented in all functions, or
partially implemented. For instance, mpfr_pow (z, x, y, rnd) fails for
very small x and some values of y.
* The mpfr_set_ld function assumes that the long double type has an
exponent of at most 15 bits.
Potential bugs:
* Possible integer overflows on some machines. Some types are used
inconsistently.
* Possible infinite loop in some functions for particular cases: when
the exact result is an exactly representable number or the middle of
consecutive two such numbers.
* mpfr_set_d may give wrong results on some architectures.
* Error analysis for some functions may be incorrect (out-of-date due
to modifications in the code?).
* mpfr_hypot may fail for x very large, y very small and a very large
target precision. Other functions may be affected by similar problems.
Problems due to compiler bugs:
* on some architectures (for example alpha-dec-osf), gcc 3.3 wrongly
compares "long double" floating-point numbers, with optimization level
1 or higher. This bug can be detected by the following program:
#include <stdio.h>
#include <stdlib.h>
#include <float.h>
int
main ()
{
long double d;
d = 1.0; while (d < LDBL_MAX / 2.0) d += d;
if (d == (long double) 0.0)
printf ("d equals 0.0\n");
}
This results in a problem in the mpfr_set_ld function. A workaround is
to compile set_ld.c with -O0 (no optimization).
|
