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
71
72
|
/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C 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. */
#ifndef _MATHBITS_H
#define _MATHBITS_H 1
/* FIXME! This file describes properties of the compiler, not the machine;
it should not be part of libc!
FIXME! This file does not deal with the -fshort-double option of
gcc! */
#ifdef __GNUC__
#if __STDC__ == 1
/* In GNU or ANSI mode, gcc leaves `float' expressions as-is, I think. */
typedef float float_t; /* `float' expressions are evaluated as
`float'. */
typedef double double_t; /* `double' expressions are evaluated as
`double'. */
/* Signal that types stay as they were declared. */
#define FLT_EVAL_METHOD 0
/* Define `INFINITY' as value of type `float_t'. */
#define INFINITY HUGE_VALF
#else
/* For `gcc -traditional', `float' expressions are evaluated as `double'. */
typedef double float_t; /* `float' expressions are evaluated as
`double'. */
typedef double double_t; /* `double' expressions are evaluated as
`double'. */
/* Signal that both types are `double'. */
#define FLT_EVAL_METHOD 1
/* Define `INFINITY' as value of type `float_t'. */
#define INFINITY HUGE_VAL
#endif
#else
/* Wild guess at types for float_t and double_t. */
typedef double float_t;
typedef double double_t;
/* Strange compiler, we don't know how it works. */
#define FLT_EVAL_METHOD -1
/* Define `INFINITY' as value of type `float_t'. */
#define INFINITY HUGE_VAL
#endif
#endif /* mathbits.h */
|
