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 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 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) ||              \
  90     (defined(__cplusplus) && __cplusplus >= 201103L)
  91 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
  92 #endif
  93 #define FLT_ROUNDS (__builtin_flt_rounds())
  94 #define FLT_RADIX __FLT_RADIX__
  95
  96 #define FLT_MANT_DIG __FLT_MANT_DIG__
  97 #define DBL_MANT_DIG __DBL_MANT_DIG__
  98 #define LDBL_MANT_DIG __LDBL_MANT_DIG__
  99
 100 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) ||              \
 101     !defined(__STRICT_ANSI__) ||                                               \
 102     (defined(__cplusplus) && __cplusplus >= 201103L) ||                        \
 103     (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
 104 #  define DECIMAL_DIG __DECIMAL_DIG__
 105 #endif
 106
 107 #define FLT_DIG __FLT_DIG__
 108 #define DBL_DIG __DBL_DIG__
 109 #define LDBL_DIG __LDBL_DIG__
 110
 111 #define FLT_MIN_EXP __FLT_MIN_EXP__
 112 #define DBL_MIN_EXP __DBL_MIN_EXP__
 113 #define LDBL_MIN_EXP __LDBL_MIN_EXP__
 114
 115 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
 116 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
 117 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
 118
 119 #define FLT_MAX_EXP __FLT_MAX_EXP__
 120 #define DBL_MAX_EXP __DBL_MAX_EXP__
 121 #define LDBL_MAX_EXP __LDBL_MAX_EXP__
 122
 123 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
 124 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
 125 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
 126
 127 #define FLT_MAX __FLT_MAX__
 128 #define DBL_MAX __DBL_MAX__
 129 #define LDBL_MAX __LDBL_MAX__
 130
 131 #define FLT_EPSILON __FLT_EPSILON__
 132 #define DBL_EPSILON __DBL_EPSILON__
 133 #define LDBL_EPSILON __LDBL_EPSILON__
 134
 135 #define FLT_MIN __FLT_MIN__
 136 #define DBL_MIN __DBL_MIN__
 137 #define LDBL_MIN __LDBL_MIN__
 138
 139 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) ||              \
 140     !defined(__STRICT_ANSI__) ||                                               \
 141     (defined(__cplusplus) && __cplusplus >= 201703L) ||                        \
 142     (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
 143 #  define FLT_TRUE_MIN __FLT_DENORM_MIN__
 144 #  define DBL_TRUE_MIN __DBL_DENORM_MIN__
 145 #  define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
 146 #  define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
 147 #  define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
 148 #  define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
 149 #  define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
 150 #  define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
 151 #  define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
 152 #endif
 153
 154 #ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
 155 #  define FLT16_MANT_DIG    __FLT16_MANT_DIG__
 156 #  define FLT16_DECIMAL_DIG __FLT16_DECIMAL_DIG__
 157 #  define FLT16_DIG         __FLT16_DIG__
 158 #  define FLT16_MIN_EXP     __FLT16_MIN_EXP__
 159 #  define FLT16_MIN_10_EXP  __FLT16_MIN_10_EXP__
 160 #  define FLT16_MAX_EXP     __FLT16_MAX_EXP__
 161 #  define FLT16_MAX_10_EXP  __FLT16_MAX_10_EXP__
 162 #  define FLT16_MAX         __FLT16_MAX__
 163 #  define FLT16_EPSILON     __FLT16_EPSILON__
 164 #  define FLT16_MIN         __FLT16_MIN__
 165 #  define FLT16_TRUE_MIN    __FLT16_TRUE_MIN__
 166 #endif /* __STDC_WANT_IEC_60559_TYPES_EXT__ */
 167
 168 #endif /* __CLANG_FLOAT_H */