float.h revision 327952 
1/*===---- float.h - Characteristics of floating point types ----------------===
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 * THE SOFTWARE.
20 *
21 *===-----------------------------------------------------------------------===
22 */
23
24#ifndef __FLOAT_H
25#define __FLOAT_H
26
27/* If we're on MinGW, fall back to the system's float.h, which might have
28 * additional definitions provided for Windows.
29 * For more details see http://msdn.microsoft.com/en-us/library/y0ybw9fy.aspx
30 *
31 * Also fall back on Darwin to allow additional definitions and
32 * implementation-defined values.
33 */
34#if (defined(__APPLE__) || (defined(__MINGW32__) || defined(_MSC_VER))) && \
35    __STDC_HOSTED__ && __has_include_next(<float.h>)
36
37/* Prior to Apple's 10.7 SDK, float.h SDK header used to apply an extra level
38 * of #include_next<float.h> to keep Metrowerks compilers happy. Avoid this
39 * extra indirection.
40 */
41#ifdef __APPLE__
42#define _FLOAT_H_
43#endif
44
45#  include_next <float.h>
46
47/* Undefine anything that we'll be redefining below. */
48#  undef FLT_EVAL_METHOD
49#  undef FLT_ROUNDS
50#  undef FLT_RADIX
51#  undef FLT_MANT_DIG
52#  undef DBL_MANT_DIG
53#  undef LDBL_MANT_DIG
54#  if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
55#    undef DECIMAL_DIG
56#  endif
57#  undef FLT_DIG
58#  undef DBL_DIG
59#  undef LDBL_DIG
60#  undef FLT_MIN_EXP
61#  undef DBL_MIN_EXP
62#  undef LDBL_MIN_EXP
63#  undef FLT_MIN_10_EXP
64#  undef DBL_MIN_10_EXP
65#  undef LDBL_MIN_10_EXP
66#  undef FLT_MAX_EXP
67#  undef DBL_MAX_EXP
68#  undef LDBL_MAX_EXP
69#  undef FLT_MAX_10_EXP
70#  undef DBL_MAX_10_EXP
71#  undef LDBL_MAX_10_EXP
72#  undef FLT_MAX
73#  undef DBL_MAX
74#  undef LDBL_MAX
75#  undef FLT_EPSILON
76#  undef DBL_EPSILON
77#  undef LDBL_EPSILON
78#  undef FLT_MIN
79#  undef DBL_MIN
80#  undef LDBL_MIN
81#  if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
82#    undef FLT_TRUE_MIN
83#    undef DBL_TRUE_MIN
84#    undef LDBL_TRUE_MIN
85#    undef FLT_DECIMAL_DIG
86#    undef DBL_DECIMAL_DIG
87#    undef LDBL_DECIMAL_DIG
88#  endif
89#endif
90
91/* Characteristics of floating point types, C99 5.2.4.2.2 */
92
93#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
94#define FLT_ROUNDS (__builtin_flt_rounds())
95#define FLT_RADIX __FLT_RADIX__
96
97#define FLT_MANT_DIG __FLT_MANT_DIG__
98#define DBL_MANT_DIG __DBL_MANT_DIG__
99#define LDBL_MANT_DIG __LDBL_MANT_DIG__
100
101#if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
102#  define DECIMAL_DIG __DECIMAL_DIG__
103#endif
104
105#define FLT_DIG __FLT_DIG__
106#define DBL_DIG __DBL_DIG__
107#define LDBL_DIG __LDBL_DIG__
108
109#define FLT_MIN_EXP __FLT_MIN_EXP__
110#define DBL_MIN_EXP __DBL_MIN_EXP__
111#define LDBL_MIN_EXP __LDBL_MIN_EXP__
112
113#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
114#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
115#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
116
117#define FLT_MAX_EXP __FLT_MAX_EXP__
118#define DBL_MAX_EXP __DBL_MAX_EXP__
119#define LDBL_MAX_EXP __LDBL_MAX_EXP__
120
121#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
122#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
123#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
124
125#define FLT_MAX __FLT_MAX__
126#define DBL_MAX __DBL_MAX__
127#define LDBL_MAX __LDBL_MAX__
128
129#define FLT_EPSILON __FLT_EPSILON__
130#define DBL_EPSILON __DBL_EPSILON__
131#define LDBL_EPSILON __LDBL_EPSILON__
132
133#define FLT_MIN __FLT_MIN__
134#define DBL_MIN __DBL_MIN__
135#define LDBL_MIN __LDBL_MIN__
136
137#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
138#  define FLT_TRUE_MIN __FLT_DENORM_MIN__
139#  define DBL_TRUE_MIN __DBL_DENORM_MIN__
140#  define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
141#  define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
142#  define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
143#  define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
144#endif
145
146#ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
147#  define FLT16_MANT_DIG    __FLT16_MANT_DIG__
148#  define FLT16_DECIMAL_DIG __FLT16_DECIMAL_DIG__
149#  define FLT16_DIG         __FLT16_DIG__
150#  define FLT16_MIN_EXP     __FLT16_MIN_EXP__
151#  define FLT16_MIN_10_EXP  __FLT16_MIN_10_EXP__
152#  define FLT16_MAX_EXP     __FLT16_MAX_EXP__
153#  define FLT16_MAX_10_EXP  __FLT16_MAX_10_EXP__
154#  define FLT16_MAX         __FLT16_MAX__
155#  define FLT16_EPSILON     __FLT16_EPSILON__
156#  define FLT16_MIN         __FLT16_MIN__
157#  define FLT16_TRUE_MIN    __FLT16_TRUE_MIN__
158#endif /* __STDC_WANT_IEC_60559_TYPES_EXT__ */
159
160#endif /* __FLOAT_H */
161