clang 20.0.0git
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 defined(__MVS__) && __has_include_next(<float.h>)
14#include_next <float.h>
15#else
16
17/* If we're on MinGW, fall back to the system's float.h, which might have
18 * additional definitions provided for Windows.
19 * For more details see http://msdn.microsoft.com/en-us/library/y0ybw9fy.aspx
20 *
21 * Also fall back on Darwin and AIX to allow additional definitions and
22 * implementation-defined values.
23 */
24#if (defined(__APPLE__) || defined(__MINGW32__) || defined(_MSC_VER) || \
25 defined(_AIX)) && \
26 __STDC_HOSTED__ && __has_include_next(<float.h>)
27
28/* Prior to Apple's 10.7 SDK, float.h SDK header used to apply an extra level
29 * of #include_next<float.h> to keep Metrowerks compilers happy. Avoid this
30 * extra indirection.
31 */
32#ifdef __APPLE__
33#define _FLOAT_H_
34#endif
35
36# include_next <float.h>
37
38/* Undefine anything that we'll be redefining below. */
39# undef FLT_EVAL_METHOD
40# undef FLT_ROUNDS
41# undef FLT_RADIX
42# undef FLT_MANT_DIG
43# undef DBL_MANT_DIG
44# undef LDBL_MANT_DIG
45#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
46 !defined(__STRICT_ANSI__) || \
47 (defined(__cplusplus) && __cplusplus >= 201103L) || \
48 (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
49# undef DECIMAL_DIG
50# endif
51# undef FLT_DIG
52# undef DBL_DIG
53# undef LDBL_DIG
54# undef FLT_MIN_EXP
55# undef DBL_MIN_EXP
56# undef LDBL_MIN_EXP
57# undef FLT_MIN_10_EXP
58# undef DBL_MIN_10_EXP
59# undef LDBL_MIN_10_EXP
60# undef FLT_MAX_EXP
61# undef DBL_MAX_EXP
62# undef LDBL_MAX_EXP
63# undef FLT_MAX_10_EXP
64# undef DBL_MAX_10_EXP
65# undef LDBL_MAX_10_EXP
66# undef FLT_MAX
67# undef DBL_MAX
68# undef LDBL_MAX
69# undef FLT_EPSILON
70# undef DBL_EPSILON
71# undef LDBL_EPSILON
72# undef FLT_MIN
73# undef DBL_MIN
74# undef LDBL_MIN
75#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
76 !defined(__STRICT_ANSI__) || \
77 (defined(__cplusplus) && __cplusplus >= 201703L) || \
78 (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
79# undef FLT_TRUE_MIN
80# undef DBL_TRUE_MIN
81# undef LDBL_TRUE_MIN
82# undef FLT_DECIMAL_DIG
83# undef DBL_DECIMAL_DIG
84# undef LDBL_DECIMAL_DIG
85# undef FLT_HAS_SUBNORM
86# undef DBL_HAS_SUBNORM
87# undef LDBL_HAS_SUBNORM
88# endif
89#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) || \
90 !defined(__STRICT_ANSI__)
91# undef FLT_NORM_MAX
92# undef DBL_NORM_MAX
93# undef LDBL_NORM_MAX
94#endif
95#endif
96
97#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) || \
98 !defined(__STRICT_ANSI__)
99# undef INFINITY
100# undef NAN
101#endif
102
103/* Characteristics of floating point types, C99 5.2.4.2.2 */
104
105#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
106 (defined(__cplusplus) && __cplusplus >= 201103L)
107#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
108#endif
109#define FLT_ROUNDS (__builtin_flt_rounds())
110#define FLT_RADIX __FLT_RADIX__
111
112#define FLT_MANT_DIG __FLT_MANT_DIG__
113#define DBL_MANT_DIG __DBL_MANT_DIG__
114#define LDBL_MANT_DIG __LDBL_MANT_DIG__
115
116#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
117 !defined(__STRICT_ANSI__) || \
118 (defined(__cplusplus) && __cplusplus >= 201103L) || \
119 (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
120# define DECIMAL_DIG __DECIMAL_DIG__
121#endif
122
123#define FLT_DIG __FLT_DIG__
124#define DBL_DIG __DBL_DIG__
125#define LDBL_DIG __LDBL_DIG__
126
127#define FLT_MIN_EXP __FLT_MIN_EXP__
128#define DBL_MIN_EXP __DBL_MIN_EXP__
129#define LDBL_MIN_EXP __LDBL_MIN_EXP__
130
131#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
132#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
133#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
134
135#define FLT_MAX_EXP __FLT_MAX_EXP__
136#define DBL_MAX_EXP __DBL_MAX_EXP__
137#define LDBL_MAX_EXP __LDBL_MAX_EXP__
138
139#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
140#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
141#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
142
143#define FLT_MAX __FLT_MAX__
144#define DBL_MAX __DBL_MAX__
145#define LDBL_MAX __LDBL_MAX__
146
147#define FLT_EPSILON __FLT_EPSILON__
148#define DBL_EPSILON __DBL_EPSILON__
149#define LDBL_EPSILON __LDBL_EPSILON__
150
151#define FLT_MIN __FLT_MIN__
152#define DBL_MIN __DBL_MIN__
153#define LDBL_MIN __LDBL_MIN__
154
155#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
156 !defined(__STRICT_ANSI__) || \
157 (defined(__cplusplus) && __cplusplus >= 201703L) || \
158 (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
159# define FLT_TRUE_MIN __FLT_DENORM_MIN__
160# define DBL_TRUE_MIN __DBL_DENORM_MIN__
161# define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
162# define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
163# define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
164# define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
165# define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
166# define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
167# define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
168#endif
169
170#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) || \
171 !defined(__STRICT_ANSI__)
172 /* C23 5.2.5.3.3p29-30 */
173# define INFINITY (__builtin_inff())
174# define NAN (__builtin_nanf(""))
175 /* C23 5.2.5.3.3p32 */
176# define FLT_NORM_MAX __FLT_NORM_MAX__
177# define DBL_NORM_MAX __DBL_NORM_MAX__
178# define LDBL_NORM_MAX __LDBL_NORM_MAX__
179#endif
180
181#ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
182# define FLT16_MANT_DIG __FLT16_MANT_DIG__
183# define FLT16_DECIMAL_DIG __FLT16_DECIMAL_DIG__
184# define FLT16_DIG __FLT16_DIG__
185# define FLT16_MIN_EXP __FLT16_MIN_EXP__
186# define FLT16_MIN_10_EXP __FLT16_MIN_10_EXP__
187# define FLT16_MAX_EXP __FLT16_MAX_EXP__
188# define FLT16_MAX_10_EXP __FLT16_MAX_10_EXP__
189# define FLT16_MAX __FLT16_MAX__
190# define FLT16_EPSILON __FLT16_EPSILON__
191# define FLT16_MIN __FLT16_MIN__
192# define FLT16_TRUE_MIN __FLT16_TRUE_MIN__
193#endif /* __STDC_WANT_IEC_60559_TYPES_EXT__ */
194
195#endif /* __MVS__ */
196#endif /* __CLANG_FLOAT_H */
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