clang/lib/Headers/float.h

   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 */