clang/lib/Headers/float.h

/*===---- float.h - Characteristics of floating point types ----------------===
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 *===-----------------------------------------------------------------------===
 */

#ifndef __FLOAT_H
#define __FLOAT_H

/* If we're on MinGW, fall back to the system's float.h, which might have
 * additional definitions provided for Windows.
 * For more details see http://msdn.microsoft.com/en-us/library/y0ybw9fy.aspx
 *
 * Also fall back on Darwin to allow additional definitions and
 * implementation-defined values.
 */
#if (defined(__APPLE__) || (defined(__MINGW32__) || defined(_MSC_VER))) && \
    __STDC_HOSTED__ && __has_include_next(<float.h>)

/* Prior to Apple's 10.7 SDK, float.h SDK header used to apply an extra level
 * of #include_next<float.h> to keep Metrowerks compilers happy. Avoid this
 * extra indirection.
 */
#ifdef __APPLE__
#define _FLOAT_H_
#endif

#  include_next <float.h>

/* Undefine anything that we'll be redefining below. */
#  undef FLT_EVAL_METHOD
#  undef FLT_ROUNDS
#  undef FLT_RADIX
#  undef FLT_MANT_DIG
#  undef DBL_MANT_DIG
#  undef LDBL_MANT_DIG
#  if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
#    undef DECIMAL_DIG
#  endif
#  undef FLT_DIG
#  undef DBL_DIG
#  undef LDBL_DIG
#  undef FLT_MIN_EXP
#  undef DBL_MIN_EXP
#  undef LDBL_MIN_EXP
#  undef FLT_MIN_10_EXP
#  undef DBL_MIN_10_EXP
#  undef LDBL_MIN_10_EXP
#  undef FLT_MAX_EXP
#  undef DBL_MAX_EXP
#  undef LDBL_MAX_EXP
#  undef FLT_MAX_10_EXP
#  undef DBL_MAX_10_EXP
#  undef LDBL_MAX_10_EXP
#  undef FLT_MAX
#  undef DBL_MAX
#  undef LDBL_MAX
#  undef FLT_EPSILON
#  undef DBL_EPSILON
#  undef LDBL_EPSILON
#  undef FLT_MIN
#  undef DBL_MIN
#  undef LDBL_MIN
#  if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
#    undef FLT_TRUE_MIN
#    undef DBL_TRUE_MIN
#    undef LDBL_TRUE_MIN
#    undef FLT_DECIMAL_DIG
#    undef DBL_DECIMAL_DIG
#    undef LDBL_DECIMAL_DIG
#  endif
#endif

/* Characteristics of floating point types, C99 5.2.4.2.2 */

#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
#define FLT_ROUNDS (__builtin_flt_rounds())
#define FLT_RADIX __FLT_RADIX__

#define FLT_MANT_DIG __FLT_MANT_DIG__
#define DBL_MANT_DIG __DBL_MANT_DIG__
#define LDBL_MANT_DIG __LDBL_MANT_DIG__

#if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
#  define DECIMAL_DIG __DECIMAL_DIG__
#endif

#define FLT_DIG __FLT_DIG__
#define DBL_DIG __DBL_DIG__
#define LDBL_DIG __LDBL_DIG__

#define FLT_MIN_EXP __FLT_MIN_EXP__
#define DBL_MIN_EXP __DBL_MIN_EXP__
#define LDBL_MIN_EXP __LDBL_MIN_EXP__

#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__

#define FLT_MAX_EXP __FLT_MAX_EXP__
#define DBL_MAX_EXP __DBL_MAX_EXP__
#define LDBL_MAX_EXP __LDBL_MAX_EXP__

#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__

#define FLT_MAX __FLT_MAX__
#define DBL_MAX __DBL_MAX__
#define LDBL_MAX __LDBL_MAX__

#define FLT_EPSILON __FLT_EPSILON__
#define DBL_EPSILON __DBL_EPSILON__
#define LDBL_EPSILON __LDBL_EPSILON__

#define FLT_MIN __FLT_MIN__
#define DBL_MIN __DBL_MIN__
#define LDBL_MIN __LDBL_MIN__

#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
#  define FLT_TRUE_MIN __FLT_DENORM_MIN__
#  define DBL_TRUE_MIN __DBL_DENORM_MIN__
#  define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
#  define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
#  define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
#  define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
#endif

#ifdef __STDC_WANT_IEC_60559_TYPES_EXT__
#  define FLT16_MANT_DIG    __FLT16_MANT_DIG__
#  define FLT16_DECIMAL_DIG __FLT16_DECIMAL_DIG__
#  define FLT16_DIG         __FLT16_DIG__
#  define FLT16_MIN_EXP     __FLT16_MIN_EXP__
#  define FLT16_MIN_10_EXP  __FLT16_MIN_10_EXP__
#  define FLT16_MAX_EXP     __FLT16_MAX_EXP__
#  define FLT16_MAX_10_EXP  __FLT16_MAX_10_EXP__
#  define FLT16_MAX         __FLT16_MAX__
#  define FLT16_EPSILON     __FLT16_EPSILON__
#  define FLT16_MIN         __FLT16_MIN__
#  define FLT16_TRUE_MIN    __FLT16_TRUE_MIN__
#endif /* __STDC_WANT_IEC_60559_TYPES_EXT__ */

#endif /* __FLOAT_H */