1/* Copyright (c) 2017 Apple Inc. All rights reserved.
  2 *
  3 * @APPLE_LICENSE_HEADER_START@
  4 *
  5 * The contents of this file constitute Original Code as defined in and
  6 * are subject to the Apple Public Source License Version 1.1 (the
  7 * "License").  You may not use this file except in compliance with the
  8 * License.  Please obtain a copy of the License at
  9 * http://www.apple.com/publicsource and read it before using this file.
 10 *
 11 * This Original Code and all software distributed under the License are
 12 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 13 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 14 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 15 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 16 * License for the specific language governing rights and limitations
 17 * under the License.
 18 *
 19 * @APPLE_LICENSE_HEADER_END@
 20 */
 21
 22#ifndef __FLOAT_H
 23#define __FLOAT_H
 24
 25#if !defined(__has_feature) || !__has_feature(modules)
 26/* clang's float.h comes before this header in the search order. It
 27 * will include this header first, undef all of these macros, and then
 28 * redeclare them. That doesn't work when the two headers are in
 29 * different clang modules. The only way to avoid redeclaration errors
 30 * is to not declare the macros here, and let clang's float.h handle
 31 * them.
 32 */
 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#undef FLT_DIG
 42#undef DBL_DIG
 43#undef LDBL_DIG
 44#undef FLT_MIN_EXP
 45#undef DBL_MIN_EXP
 46#undef LDBL_MIN_EXP
 47#undef FLT_MIN_10_EXP
 48#undef DBL_MIN_10_EXP
 49#undef LDBL_MIN_10_EXP
 50#undef FLT_MAX_EXP
 51#undef DBL_MAX_EXP
 52#undef LDBL_MAX_EXP
 53#undef FLT_MAX_10_EXP
 54#undef DBL_MAX_10_EXP
 55#undef LDBL_MAX_10_EXP
 56#undef FLT_MAX
 57#undef DBL_MAX
 58#undef LDBL_MAX
 59#undef FLT_EPSILON
 60#undef DBL_EPSILON
 61#undef LDBL_EPSILON
 62#undef FLT_MIN
 63#undef DBL_MIN
 64#undef LDBL_MIN
 65
 66#if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
 67#  undef DECIMAL_DIG
 68#endif
 69
 70#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
 71#  undef FLT_HAS_SUBNORM
 72#  undef DBL_HAS_SUBNORM
 73#  undef LDBL_HAS_SUBNORM
 74#  undef FLT_TRUE_MIN
 75#  undef DBL_TRUE_MIN
 76#  undef LDBL_TRUE_MIN
 77#  undef FLT_DECIMAL_DIG
 78#  undef DBL_DECIMAL_DIG
 79#  undef LDBL_DECIMAL_DIG
 80#endif
 81
 82/* Characteristics of floating point types, C99 5.2.4.2.2 */
 83
 84#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
 85#define FLT_ROUNDS (__builtin_flt_rounds())
 86#define FLT_RADIX __FLT_RADIX__
 87
 88#define FLT_MANT_DIG __FLT_MANT_DIG__
 89#define DBL_MANT_DIG __DBL_MANT_DIG__
 90#define LDBL_MANT_DIG __LDBL_MANT_DIG__
 91
 92#define FLT_DIG __FLT_DIG__
 93#define DBL_DIG __DBL_DIG__
 94#define LDBL_DIG __LDBL_DIG__
 95
 96#define FLT_MIN_EXP __FLT_MIN_EXP__
 97#define DBL_MIN_EXP __DBL_MIN_EXP__
 98#define LDBL_MIN_EXP __LDBL_MIN_EXP__
 99
100#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
101#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
102#define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
103
104#define FLT_MAX_EXP __FLT_MAX_EXP__
105#define DBL_MAX_EXP __DBL_MAX_EXP__
106#define LDBL_MAX_EXP __LDBL_MAX_EXP__
107
108#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
109#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
110#define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
111
112#define FLT_MAX __FLT_MAX__
113#define DBL_MAX __DBL_MAX__
114#define LDBL_MAX __LDBL_MAX__
115
116#define FLT_EPSILON __FLT_EPSILON__
117#define DBL_EPSILON __DBL_EPSILON__
118#define LDBL_EPSILON __LDBL_EPSILON__
119
120#define FLT_MIN __FLT_MIN__
121#define DBL_MIN __DBL_MIN__
122#define LDBL_MIN __LDBL_MIN__
123
124#if __STDC_VERSION__ >= 199901L || !defined(__STRICT_ANSI__)
125#  define DECIMAL_DIG __DECIMAL_DIG__
126#endif
127
128#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
129#  if defined __arm__ /*  On 32-bit arm, denorms are not supported.           */
130#    define FLT_HAS_SUBNORM 0
131#    define DBL_HAS_SUBNORM 0
132#    define LDBL_HAS_SUBNORM 0
133#    define FLT_TRUE_MIN __FLT_MIN__
134#    define DBL_TRUE_MIN __DBL_MIN__
135#    define LDBL_TRUE_MIN __LDBL_MIN__
136#  else /* All Apple platforms except 32-bit arm have denorms.                */
137#    define FLT_HAS_SUBNORM 1
138#    define DBL_HAS_SUBNORM 1
139#    define LDBL_HAS_SUBNORM 1
140#    define FLT_TRUE_MIN __FLT_DENORM_MIN__
141#    define DBL_TRUE_MIN __DBL_DENORM_MIN__
142#    define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
143#  endif
144#  define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
145#  define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
146#  define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
147#endif
148
149#endif /* !__has_feature(modules) */
150
151#endif /* __FLOAT_H */