bits/floatn-common.h

   1 /* Macros to control TS 18661-3 glibc features where the same
   2    definitions are appropriate for all platforms.
   3    Copyright (C) 2017-2018 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _BITS_FLOATN_COMMON_H
  21 #define _BITS_FLOATN_COMMON_H
  22
  23 #include <features.h>
  24 #include <bits/long-double.h>
  25
  26 /* This header should be included at the bottom of each bits/floatn.h.
  27    It defines the following macros for each _FloatN and _FloatNx type,
  28    where the same definitions, or definitions based only on the macros
  29    in bits/floatn.h, are appropriate for all glibc configurations.  */
  30
  31 /* Defined to 1 if the current compiler invocation provides a
  32    floating-point type with the right format for this type, and this
  33    glibc includes corresponding *fN or *fNx interfaces for it.  */
  34 #define __HAVE_FLOAT16 0
  35 #define __HAVE_FLOAT32 1
  36 #define __HAVE_FLOAT64 1
  37 #define __HAVE_FLOAT32X 1
  38 #define __HAVE_FLOAT128X 0
  39
  40 /* Defined to 1 if the corresponding __HAVE_<type> macro is 1 and the
  41    type is the first with its format in the sequence of (the default
  42    choices for) float, double, long double, _Float16, _Float32,
  43    _Float64, _Float128, _Float32x, _Float64x, _Float128x for this
  44    glibc; that is, if functions present once per floating-point format
  45    rather than once per type are present for this type.
  46
  47    All configurations supported by glibc have _Float32 the same format
  48    as float, _Float64 and _Float32x the same format as double, the
  49    _Float64x the same format as either long double or _Float128.  No
  50    configurations support _Float128x or, as of GCC 7, have compiler
  51    support for a type meeting the requirements for _Float128x.  */
  52 #define __HAVE_DISTINCT_FLOAT16 __HAVE_FLOAT16
  53 #define __HAVE_DISTINCT_FLOAT32 0
  54 #define __HAVE_DISTINCT_FLOAT64 0
  55 #define __HAVE_DISTINCT_FLOAT32X 0
  56 #define __HAVE_DISTINCT_FLOAT64X 0
  57 #define __HAVE_DISTINCT_FLOAT128X __HAVE_FLOAT128X
  58
  59 /* Defined to 1 if any _FloatN or _FloatNx types that are not
  60    ABI-distinct are however distinct types at the C language level (so
  61    for the purposes of __builtin_types_compatible_p and _Generic).  */
  62 #if __GNUC_PREREQ (7, 0) && !defined __cplusplus
  63 # define __HAVE_FLOATN_NOT_TYPEDEF 1
  64 #else
  65 # define __HAVE_FLOATN_NOT_TYPEDEF 0
  66 #endif
  67
  68 #ifndef __ASSEMBLER__
  69
  70 /* Defined to concatenate the literal suffix to be used with _FloatN
  71    or _FloatNx types, if __HAVE_<type> is 1.  The corresponding
  72    literal suffixes exist since GCC 7, for C only.  */
  73 # if __HAVE_FLOAT16
  74 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
  75 /* No corresponding suffix available for this type.  */
  76 #   define __f16(x) ((_Float16) x##f)
  77 #  else
  78 #   define __f16(x) x##f16
  79 #  endif
  80 # endif
  81
  82 # if __HAVE_FLOAT32
  83 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
  84 #   define __f32(x) x##f
  85 #  else
  86 #   define __f32(x) x##f32
  87 #  endif
  88 # endif
  89
  90 # if __HAVE_FLOAT64
  91 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
  92 #   ifdef __NO_LONG_DOUBLE_MATH
  93 #    define __f64(x) x##l
  94 #   else
  95 #    define __f64(x) x
  96 #   endif
  97 #  else
  98 #   define __f64(x) x##f64
  99 #  endif
 100 # endif
 101
 102 # if __HAVE_FLOAT32X
 103 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 104 #   define __f32x(x) x
 105 #  else
 106 #   define __f32x(x) x##f32x
 107 #  endif
 108 # endif
 109
 110 # if __HAVE_FLOAT64X
 111 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 112 #   if __HAVE_FLOAT64X_LONG_DOUBLE
 113 #    define __f64x(x) x##l
 114 #   else
 115 #    define __f64x(x) __f128 (x)
 116 #   endif
 117 #  else
 118 #   define __f64x(x) x##f64x
 119 #  endif
 120 # endif
 121
 122 # if __HAVE_FLOAT128X
 123 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 124 #   error "_Float128X supported but no constant suffix"
 125 #  else
 126 #   define __f128x(x) x##f128x
 127 #  endif
 128 # endif
 129
 130 /* Defined to a complex type if __HAVE_<type> is 1.  */
 131 # if __HAVE_FLOAT16
 132 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 133 typedef _Complex float __cfloat16 __attribute__ ((__mode__ (__HC__)));
 134 #   define __CFLOAT16 __cfloat16
 135 #  else
 136 #   define __CFLOAT16 _Complex _Float16
 137 #  endif
 138 # endif
 139
 140 # if __HAVE_FLOAT32
 141 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 142 #   define __CFLOAT32 _Complex float
 143 #  else
 144 #   define __CFLOAT32 _Complex _Float32
 145 #  endif
 146 # endif
 147
 148 # if __HAVE_FLOAT64
 149 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 150 #   ifdef __NO_LONG_DOUBLE_MATH
 151 #    define __CFLOAT64 _Complex long double
 152 #   else
 153 #    define __CFLOAT64 _Complex double
 154 #   endif
 155 #  else
 156 #   define __CFLOAT64 _Complex _Float64
 157 #  endif
 158 # endif
 159
 160 # if __HAVE_FLOAT32X
 161 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 162 #   define __CFLOAT32X _Complex double
 163 #  else
 164 #   define __CFLOAT32X _Complex _Float32x
 165 #  endif
 166 # endif
 167
 168 # if __HAVE_FLOAT64X
 169 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 170 #   if __HAVE_FLOAT64X_LONG_DOUBLE
 171 #    define __CFLOAT64X _Complex long double
 172 #   else
 173 #    define __CFLOAT64X __CFLOAT128
 174 #   endif
 175 #  else
 176 #   define __CFLOAT64X _Complex _Float64x
 177 #  endif
 178 # endif
 179
 180 # if __HAVE_FLOAT128X
 181 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 182 #   error "_Float128X supported but no complex type"
 183 #  else
 184 #   define __CFLOAT128X _Complex _Float128x
 185 #  endif
 186 # endif
 187
 188 /* The remaining of this file provides support for older compilers.  */
 189 # if __HAVE_FLOAT16
 190
 191 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 192 typedef float _Float16 __attribute__ ((__mode__ (__HF__)));
 193 #  endif
 194
 195 #  if !__GNUC_PREREQ (7, 0)
 196 #   define __builtin_huge_valf16() ((_Float16) __builtin_huge_val ())
 197 #   define __builtin_inff16() ((_Float16) __builtin_inf ())
 198 #   define __builtin_nanf16(x) ((_Float16) __builtin_nan (x))
 199 #   define __builtin_nansf16(x) ((_Float16) __builtin_nans (x))
 200 #  endif
 201
 202 # endif
 203
 204 # if __HAVE_FLOAT32
 205
 206 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 207 typedef float _Float32;
 208 #  endif
 209
 210 #  if !__GNUC_PREREQ (7, 0)
 211 #   define __builtin_huge_valf32() (__builtin_huge_valf ())
 212 #   define __builtin_inff32() (__builtin_inff ())
 213 #   define __builtin_nanf32(x) (__builtin_nanf (x))
 214 #   define __builtin_nansf32(x) (__builtin_nansf (x))
 215 #  endif
 216
 217 # endif
 218
 219 # if __HAVE_FLOAT64
 220
 221 /* If double, long double and _Float64 all have the same set of
 222    values, TS 18661-3 requires the usual arithmetic conversions on
 223    long double and _Float64 to produce _Float64.  For this to be the
 224    case when building with a compiler without a distinct _Float64
 225    type, _Float64 must be a typedef for long double, not for
 226    double.  */
 227
 228 #  ifdef __NO_LONG_DOUBLE_MATH
 229
 230 #   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 231 typedef long double _Float64;
 232 #   endif
 233
 234 #   if !__GNUC_PREREQ (7, 0)
 235 #    define __builtin_huge_valf64() (__builtin_huge_vall ())
 236 #    define __builtin_inff64() (__builtin_infl ())
 237 #    define __builtin_nanf64(x) (__builtin_nanl (x))
 238 #    define __builtin_nansf64(x) (__builtin_nansl (x))
 239 #   endif
 240
 241 #  else
 242
 243 #   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 244 typedef double _Float64;
 245 #   endif
 246
 247 #   if !__GNUC_PREREQ (7, 0)
 248 #    define __builtin_huge_valf64() (__builtin_huge_val ())
 249 #    define __builtin_inff64() (__builtin_inf ())
 250 #    define __builtin_nanf64(x) (__builtin_nan (x))
 251 #    define __builtin_nansf64(x) (__builtin_nans (x))
 252 #   endif
 253
 254 #  endif
 255
 256 # endif
 257
 258 # if __HAVE_FLOAT32X
 259
 260 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 261 typedef double _Float32x;
 262 #  endif
 263
 264 #  if !__GNUC_PREREQ (7, 0)
 265 #   define __builtin_huge_valf32x() (__builtin_huge_val ())
 266 #   define __builtin_inff32x() (__builtin_inf ())
 267 #   define __builtin_nanf32x(x) (__builtin_nan (x))
 268 #   define __builtin_nansf32x(x) (__builtin_nans (x))
 269 #  endif
 270
 271 # endif
 272
 273 # if __HAVE_FLOAT64X
 274
 275 #  if __HAVE_FLOAT64X_LONG_DOUBLE
 276
 277 #   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 278 typedef long double _Float64x;
 279 #   endif
 280
 281 #   if !__GNUC_PREREQ (7, 0)
 282 #    define __builtin_huge_valf64x() (__builtin_huge_vall ())
 283 #    define __builtin_inff64x() (__builtin_infl ())
 284 #    define __builtin_nanf64x(x) (__builtin_nanl (x))
 285 #    define __builtin_nansf64x(x) (__builtin_nansl (x))
 286 #   endif
 287
 288 #  else
 289
 290 #   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 291 typedef _Float128 _Float64x;
 292 #   endif
 293
 294 #   if !__GNUC_PREREQ (7, 0)
 295 #    define __builtin_huge_valf64x() (__builtin_huge_valf128 ())
 296 #    define __builtin_inff64x() (__builtin_inff128 ())
 297 #    define __builtin_nanf64x(x) (__builtin_nanf128 (x))
 298 #    define __builtin_nansf64x(x) (__builtin_nansf128 (x))
 299 #   endif
 300
 301 #  endif
 302
 303 # endif
 304
 305 # if __HAVE_FLOAT128X
 306
 307 #  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
 308 #   error "_Float128x supported but no type"
 309 #  endif
 310
 311 #  if !__GNUC_PREREQ (7, 0)
 312 #   define __builtin_huge_valf128x() ((_Float128x) __builtin_huge_val ())
 313 #   define __builtin_inff128x() ((_Float128x) __builtin_inf ())
 314 #   define __builtin_nanf128x(x) ((_Float128x) __builtin_nan (x))
 315 #   define __builtin_nansf128x(x) ((_Float128x) __builtin_nans (x))
 316 #  endif
 317
 318 # endif
 319
 320 #endif /* !__ASSEMBLER__.  */
 321
 322 #endif /* _BITS_FLOATN_COMMON_H */