clang  16.0.0git
float.h
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1 /*===---- float.h - Characteristics of floating point types ----------------===
2  *
3  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4  * See https://llvm.org/LICENSE.txt for license information.
5  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6  *
7  *===-----------------------------------------------------------------------===
8  */
9 
10 #ifndef __CLANG_FLOAT_H
11 #define __CLANG_FLOAT_H
12 
13 /* If we're on MinGW, fall back to the system's float.h, which might have
14  * additional definitions provided for Windows.
15  * For more details see http://msdn.microsoft.com/en-us/library/y0ybw9fy.aspx
16  *
17  * Also fall back on Darwin and AIX to allow additional definitions and
18  * implementation-defined values.
19  */
20 #if (defined(__APPLE__) || defined(__MINGW32__) || defined(_MSC_VER) || \
21  defined(_AIX)) && \
22  __STDC_HOSTED__ && __has_include_next(<float.h>)
23 
24 /* Prior to Apple's 10.7 SDK, float.h SDK header used to apply an extra level
25  * of #include_next<float.h> to keep Metrowerks compilers happy. Avoid this
26  * extra indirection.
27  */
28 #ifdef __APPLE__
29 #define _FLOAT_H_
30 #endif
31 
32 # include_next <float.h>
33 
34 /* Undefine anything that we'll be redefining below. */
35 # undef FLT_EVAL_METHOD
36 # undef FLT_ROUNDS
37 # undef FLT_RADIX
38 # undef FLT_MANT_DIG
39 # undef DBL_MANT_DIG
40 # undef LDBL_MANT_DIG
41 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
42  !defined(__STRICT_ANSI__) || \
43  (defined(__cplusplus) && __cplusplus >= 201103L) || \
44  (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
45 # undef DECIMAL_DIG
46 # endif
47 # undef FLT_DIG
48 # undef DBL_DIG
49 # undef LDBL_DIG
50 # undef FLT_MIN_EXP
51 # undef DBL_MIN_EXP
52 # undef LDBL_MIN_EXP
53 # undef FLT_MIN_10_EXP
54 # undef DBL_MIN_10_EXP
55 # undef LDBL_MIN_10_EXP
56 # undef FLT_MAX_EXP
57 # undef DBL_MAX_EXP
58 # undef LDBL_MAX_EXP
59 # undef FLT_MAX_10_EXP
60 # undef DBL_MAX_10_EXP
61 # undef LDBL_MAX_10_EXP
62 # undef FLT_MAX
63 # undef DBL_MAX
64 # undef LDBL_MAX
65 # undef FLT_EPSILON
66 # undef DBL_EPSILON
67 # undef LDBL_EPSILON
68 # undef FLT_MIN
69 # undef DBL_MIN
70 # undef LDBL_MIN
71 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
72  !defined(__STRICT_ANSI__) || \
73  (defined(__cplusplus) && __cplusplus >= 201703L) || \
74  (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
75 # undef FLT_TRUE_MIN
76 # undef DBL_TRUE_MIN
77 # undef LDBL_TRUE_MIN
78 # undef FLT_DECIMAL_DIG
79 # undef DBL_DECIMAL_DIG
80 # undef LDBL_DECIMAL_DIG
81 # undef FLT_HAS_SUBNORM
82 # undef DBL_HAS_SUBNORM
83 # undef LDBL_HAS_SUBNORM
84 # endif
85 #endif
86 
87 /* Characteristics of floating point types, C99 5.2.4.2.2 */
88 
89 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
90 #define FLT_ROUNDS (__builtin_flt_rounds())
91 #define FLT_RADIX __FLT_RADIX__
92 
93 #define FLT_MANT_DIG __FLT_MANT_DIG__
94 #define DBL_MANT_DIG __DBL_MANT_DIG__
95 #define LDBL_MANT_DIG __LDBL_MANT_DIG__
96 
97 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
98  !defined(__STRICT_ANSI__) || \
99  (defined(__cplusplus) && __cplusplus >= 201103L) || \
100  (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
101 # define DECIMAL_DIG __DECIMAL_DIG__
102 #endif
103 
104 #define FLT_DIG __FLT_DIG__
105 #define DBL_DIG __DBL_DIG__
106 #define LDBL_DIG __LDBL_DIG__
107 
108 #define FLT_MIN_EXP __FLT_MIN_EXP__
109 #define DBL_MIN_EXP __DBL_MIN_EXP__
110 #define LDBL_MIN_EXP __LDBL_MIN_EXP__
111 
112 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
113 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
114 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
115 
116 #define FLT_MAX_EXP __FLT_MAX_EXP__
117 #define DBL_MAX_EXP __DBL_MAX_EXP__
118 #define LDBL_MAX_EXP __LDBL_MAX_EXP__
119 
120 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
121 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
122 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
123 
124 #define FLT_MAX __FLT_MAX__
125 #define DBL_MAX __DBL_MAX__
126 #define LDBL_MAX __LDBL_MAX__
127 
128 #define FLT_EPSILON __FLT_EPSILON__
129 #define DBL_EPSILON __DBL_EPSILON__
130 #define LDBL_EPSILON __LDBL_EPSILON__
131 
132 #define FLT_MIN __FLT_MIN__
133 #define DBL_MIN __DBL_MIN__
134 #define LDBL_MIN __LDBL_MIN__
135 
136 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
137  !defined(__STRICT_ANSI__) || \
138  (defined(__cplusplus) && __cplusplus >= 201703L) || \
139  (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
140 # define FLT_TRUE_MIN __FLT_DENORM_MIN__
141 # define DBL_TRUE_MIN __DBL_DENORM_MIN__
142 # define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
143 # define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
144 # define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
145 # define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
146 # define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
147 # define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
148 # define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
149 #endif
150 
151 #ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
152 # define FLT16_MANT_DIG __FLT16_MANT_DIG__
153 # define FLT16_DECIMAL_DIG __FLT16_DECIMAL_DIG__
154 # define FLT16_DIG __FLT16_DIG__
155 # define FLT16_MIN_EXP __FLT16_MIN_EXP__
156 # define FLT16_MIN_10_EXP __FLT16_MIN_10_EXP__
157 # define FLT16_MAX_EXP __FLT16_MAX_EXP__
158 # define FLT16_MAX_10_EXP __FLT16_MAX_10_EXP__
159 # define FLT16_MAX __FLT16_MAX__
160 # define FLT16_EPSILON __FLT16_EPSILON__
161 # define FLT16_MIN __FLT16_MIN__
162 # define FLT16_TRUE_MIN __FLT16_TRUE_MIN__
163 #endif /* __STDC_WANT_IEC_60559_TYPES_EXT__ */
164 
165 #endif /* __CLANG_FLOAT_H */