zig/lib/include/float.h

/*===---- float.h - Characteristics of floating point types ----------------===
 *
 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 * See https://llvm.org/LICENSE.txt for license information.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 *
 *===-----------------------------------------------------------------------===
 */

#ifndef __CLANG_FLOAT_H
#define __CLANG_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 and AIX to allow additional definitions and
 * implementation-defined values.
 */
#if (defined(__APPLE__) || defined(__MINGW32__) || defined(_MSC_VER) ||        \
     defined(_AIX)) &&                                                         \
    __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 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) ||              \
    !defined(__STRICT_ANSI__) ||                                               \
    (defined(__cplusplus) && __cplusplus >= 201103L) ||                        \
    (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
#    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 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) ||              \
    !defined(__STRICT_ANSI__) ||                                               \
    (defined(__cplusplus) && __cplusplus >= 201703L) ||                        \
    (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
#    undef FLT_TRUE_MIN
#    undef DBL_TRUE_MIN
#    undef LDBL_TRUE_MIN
#    undef FLT_DECIMAL_DIG
#    undef DBL_DECIMAL_DIG
#    undef LDBL_DECIMAL_DIG
#    undef FLT_HAS_SUBNORM
#    undef DBL_HAS_SUBNORM
#    undef LDBL_HAS_SUBNORM
#  endif
#endif

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

#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) ||              \
    (defined(__cplusplus) && __cplusplus >= 201103L)
#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
#endif
#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 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) ||              \
    !defined(__STRICT_ANSI__) ||                                               \
    (defined(__cplusplus) && __cplusplus >= 201103L) ||                        \
    (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
#  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 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) ||              \
    !defined(__STRICT_ANSI__) ||                                               \
    (defined(__cplusplus) && __cplusplus >= 201703L) ||                        \
    (__STDC_HOSTED__ && defined(_AIX) && defined(_ALL_SOURCE))
#  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__
#  define FLT_HAS_SUBNORM __FLT_HAS_DENORM__
#  define DBL_HAS_SUBNORM __DBL_HAS_DENORM__
#  define LDBL_HAS_SUBNORM __LDBL_HAS_DENORM__
#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 /* __CLANG_FLOAT_H */