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incubator-nuttx/libs/libm/newlib/include/machine/ieeefp.h

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/****************************************************************************
* libs/libm/newlib/include/machine/ieeefp.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __IEEE_BIG_ENDIAN
#ifndef __IEEE_LITTLE_ENDIAN
/* This file can define macros to choose variations of the IEEE float
* format:
*
* _FLT_LARGEST_EXPONENT_IS_NORMAL
*
* Defined if the float format uses the largest exponent for finite
* numbers rather than NaN and infinity representations. Such a
* format cannot represent NaNs or infinities at all, but it's FLT_MAX
* is twice the IEEE value.
*
* _FLT_NO_DENORMALS
*
* Defined if the float format does not support IEEE denormals. Every
* float with a zero exponent is taken to be a zero representation.
*
* ??? At the moment, there are no equivalent macros above for doubles and
* the macros are not fully supported by --enable-newlib-hw-fp.
*
* __IEEE_BIG_ENDIAN
*
* Defined if the float format is big endian. This is mutually
* exclusive with __IEEE_LITTLE_ENDIAN.
*
* __IEEE_LITTLE_ENDIAN
*
* Defined if the float format is little endian. This is mutually
* exclusive with __IEEE_BIG_ENDIAN.
*
* Note that one of __IEEE_BIG_ENDIAN or __IEEE_LITTLE_ENDIAN must be
* specified for a platform or error will occur.
*
* __IEEE_BYTES_LITTLE_ENDIAN
*
* This flag is used in conjunction with __IEEE_BIG_ENDIAN to describe
* a situation whereby multiple words of an IEEE floating point are in
* big endian order, but the words themselves are little endian with
* respect to the bytes.
*
* _DOUBLE_IS_32BITS
*
* This is used on platforms that support double by using the 32-bit
* IEEE float type.
*
* _FLOAT_ARG
*
* This represents what type a float arg is passed as. It is used when
* the type is not promoted to double.
*
* __OBSOLETE_MATH_DEFAULT
*
* Default value for __OBSOLETE_MATH if that's not set by the user.
* It should be set here based on predefined feature macros.
*
* __OBSOLETE_MATH
*
* If set to 1 then some new math code will be disabled and older libm
* code will be used instead. This is necessary because the new math
* code does not support all targets, it assumes that the toolchain has
* ISO C99 support (hexfloat literals, standard fenv semantics), the
* target has IEEE-754 conforming binary32 float and binary64 double
* (not mixed endian) representation, standard SNaN representation,
* double and single precision arithmetics has similar latency and it
* has no legacy SVID matherr support, only POSIX errno and fenv
* exception based error handling.
*/
#if (defined(__arm__) || defined(__thumb__)) && !defined(__MAVERICK__)
/* ARM traditionally used big-endian words; and within those words the
* byte ordering was big or little endian depending upon the target.
* Modern floating-point formats are naturally ordered; in this case
* __VFP_FP__ will be defined, even if soft-float.
*/
#ifdef __VFP_FP__
# ifdef __ARMEL__
# define __IEEE_LITTLE_ENDIAN
# else
# define __IEEE_BIG_ENDIAN
# endif
# if __ARM_FP & 0x8
# define __OBSOLETE_MATH_DEFAULT 0
# endif
#else
# define __IEEE_BIG_ENDIAN
# ifdef __ARMEL__
# define __IEEE_BYTES_LITTLE_ENDIAN
# endif
#endif
#ifndef __SOFTFP__
# define _SUPPORTS_ERREXCEPT
#endif
/* As per ISO/IEC TS 18661 '__FLT_EVAL_METHOD__' will be defined to 16
* (if compiling with +fp16 support) so it can't be used by math.h to
* define float_t and double_t. For values of '__FLT_EVAL_METHOD__'
* other than 0, 1, 2 the definition of float_t and double_t is
* implementation-defined.
*/
#define __DOUBLE_TYPE double
#define __FLOAT_TYPE float
#endif
#if defined (__aarch64__)
#if defined (__AARCH64EL__)
#define __IEEE_LITTLE_ENDIAN
#else
#define __IEEE_BIG_ENDIAN
#endif
#define __OBSOLETE_MATH_DEFAULT 0
#ifdef __ARM_FP
# define _SUPPORTS_ERREXCEPT
#endif
/* As per ISO/IEC TS 18661 '__FLT_EVAL_METHOD__' will be defined to 16
* (if compiling with +fp16 support) so it can't be used by math.h to
* define float_t and double_t. For values of '__FLT_EVAL_METHOD__'
* other than 0, 1, 2 the definition of float_t and double_t is
* implementation-defined.
*/
#define __DOUBLE_TYPE double
#define __FLOAT_TYPE float
#endif
#ifdef __epiphany__
#define __IEEE_LITTLE_ENDIAN
#define Sudden_Underflow 1
#endif
#ifdef __hppa__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __nds32__
#ifdef __big_endian__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __SPU__
#define __IEEE_BIG_ENDIAN
#define isfinite(__y) \
(__extension__ ({int __cy; \
(sizeof (__y) == sizeof (float)) ? (1) : \
(__cy = fpclassify(__y)) != FP_INFINITE && __cy != FP_NAN;}))
#define isinf(__x) ((sizeof (__x) == sizeof (float)) ? (0) : __isinfd(__x))
#define isnan(__x) ((sizeof (__x) == sizeof (float)) ? (0) : __isnand(__x))
/* Macros for use in ieeefp.h. We can't just define the real ones here
* (like those above) as we have name space issues when this is *not*
* included via generic the ieeefp.h.
*/
#define __ieeefp_isnanf(x) 0
#define __ieeefp_isinff(x) 0
#define __ieeefp_finitef(x) 1
#endif
#ifdef __sparc__
#ifdef __LITTLE_ENDIAN_DATA__
#define __IEEE_LITTLE_ENDIAN
#else
#define __IEEE_BIG_ENDIAN
#endif
#endif
#if defined(__m68k__) || defined(__mc68000__)
#define __IEEE_BIG_ENDIAN
#endif
#if defined(__mc68hc11__) || defined(__mc68hc12__) || defined(__mc68hc1x__)
#define __IEEE_BIG_ENDIAN
#ifdef __HAVE_SHORT_DOUBLE__
# define _DOUBLE_IS_32BITS
#endif
#endif
#if defined (__H8300__) || defined (__H8300H__) || defined (__H8300S__) || defined (__H8500__) || defined (__H8300SX__)
#define __IEEE_BIG_ENDIAN
#define _FLOAT_ARG float
#define _DOUBLE_IS_32BITS
#endif
#if defined (__xc16x__) || defined (__xc16xL__) || defined (__xc16xS__)
#define __IEEE_LITTLE_ENDIAN
#define _FLOAT_ARG float
#define _DOUBLE_IS_32BITS
#endif
#ifdef __sh__
#ifdef __LITTLE_ENDIAN__
#define __IEEE_LITTLE_ENDIAN
#else
#define __IEEE_BIG_ENDIAN
#endif
#if defined(__SH2E__) || defined(__SH3E__) || defined(__SH4_SINGLE_ONLY__) || defined(__SH2A_SINGLE_ONLY__)
#define _DOUBLE_IS_32BITS
#endif
#endif
#ifdef _AM29K
#define __IEEE_BIG_ENDIAN
#endif
#ifdef _WIN32
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __i386__
#define __IEEE_LITTLE_ENDIAN
# define _SUPPORTS_ERREXCEPT
#endif
#ifdef __riscv
#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __riscv_flen
# define _SUPPORTS_ERREXCEPT
#endif
#if __riscv_flen == 64
# define __OBSOLETE_MATH_DEFAULT 0
#else
# define __OBSOLETE_MATH_DEFAULT 1
#endif
#endif
#ifdef __i960__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __lm32__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __M32R__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __nvptx__
#define __IEEE_LITTLE_ENDIAN
#endif
#if defined(_C4x) || defined(_C3x)
#define __IEEE_BIG_ENDIAN
#define _DOUBLE_IS_32BITS
#endif
#ifdef __TMS320C6X__
#ifdef _BIG_ENDIAN
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __TIC80__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __MIPSEL__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __MIPSEB__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __MMIX__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __D30V__
#define __IEEE_BIG_ENDIAN
#endif
/* necv70 was __IEEE_LITTLE_ENDIAN. */
#ifdef __W65__
#define __IEEE_LITTLE_ENDIAN
#define _DOUBLE_IS_32BITS
#endif
#if defined(__Z8001__) || defined(__Z8002__)
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __m88k__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __mn10300__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __mn10200__
#define __IEEE_LITTLE_ENDIAN
#define _DOUBLE_IS_32BITS
#endif
#ifdef __v800
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __v850
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __D10V__
#define __IEEE_BIG_ENDIAN
#if __DOUBLE__ == 32
#define _DOUBLE_IS_32BITS
#endif
#endif
#ifdef __PPC__
#if (defined(_BIG_ENDIAN) && _BIG_ENDIAN) || (defined(_AIX) && _AIX)
#define __IEEE_BIG_ENDIAN
#else
#if (defined(_LITTLE_ENDIAN) && _LITTLE_ENDIAN) || (defined(__sun__) && __sun__) || (defined(_WIN32) && _WIN32)
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#endif
#ifdef __xstormy16__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __arc__
#ifdef __big_endian__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __CRX__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __CSKY__
#ifdef __CSKYBE__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __fr30__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __FT32__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __mcore__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __mt__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __frv__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __moxie__
#ifdef __MOXIE_BIG_ENDIAN__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __ia64__
#ifdef __BIG_ENDIAN__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __AVR__
#define __IEEE_LITTLE_ENDIAN
#define _DOUBLE_IS_32BITS
#endif
#if defined(__or1k__) || defined(__OR1K__) || defined(__OR1KND__)
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __IP2K__
#define __IEEE_BIG_ENDIAN
#define __SMALL_BITFIELDS
#define _DOUBLE_IS_32BITS
#endif
#ifdef __iq2000__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __MAVERICK__
#ifdef __ARMEL__
# define __IEEE_LITTLE_ENDIAN
#else /* must be __ARMEB__ */
# define __IEEE_BIG_ENDIAN
#endif /* __ARMEL__ */
#endif /* __MAVERICK__ */
#ifdef __m32c__
#define __IEEE_LITTLE_ENDIAN
#define __SMALL_BITFIELDS
#endif
#ifdef __CRIS__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __BFIN__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __x86_64__
#define __IEEE_LITTLE_ENDIAN
# define _SUPPORTS_ERREXCEPT
#endif
#ifdef __mep__
#ifdef __LITTLE_ENDIAN__
#define __IEEE_LITTLE_ENDIAN
#else
#define __IEEE_BIG_ENDIAN
#endif
#endif
#ifdef __MICROBLAZE__
#ifndef __MICROBLAZEEL__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#endif
#ifdef __MSP430__
#define __IEEE_LITTLE_ENDIAN
#define __SMALL_BITFIELDS /* 16 Bit INT */
#endif
#ifdef __PRU__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __RL78__
#define __IEEE_LITTLE_ENDIAN
#define __SMALL_BITFIELDS /* 16 Bit INT */
#ifndef __RL78_64BIT_DOUBLES__
#define _DOUBLE_IS_32BITS
#endif
#endif
#ifdef __RX__
#ifdef __RX_BIG_ENDIAN__
#define __IEEE_BIG_ENDIAN
#else
#define __IEEE_LITTLE_ENDIAN
#endif
#ifndef __RX_64BIT_DOUBLES__
#define _DOUBLE_IS_32BITS
#endif
#ifdef __RX_16BIT_INTS__
#define __SMALL_BITFIELDS
#endif
#endif
#if (defined(__CR16__) || defined(__CR16C__) ||defined(__CR16CP__))
#define __IEEE_LITTLE_ENDIAN
#define __SMALL_BITFIELDS /* 16 Bit INT */
#endif
#ifdef __NIOS2__
# ifdef __nios2_big_endian__
# define __IEEE_BIG_ENDIAN
# else
# define __IEEE_LITTLE_ENDIAN
# endif
#endif
#ifdef __VISIUM__
#define __IEEE_BIG_ENDIAN
#endif
#ifdef __AMDGCN__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __XTENSA_EL__
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __CYGWIN__
#define __OBSOLETE_MATH_DEFAULT 0
#endif
#ifndef __OBSOLETE_MATH_DEFAULT
/* Use old math code by default. */
#define __OBSOLETE_MATH_DEFAULT 1
#endif
#ifndef __OBSOLETE_MATH
#define __OBSOLETE_MATH __OBSOLETE_MATH_DEFAULT
#endif
#ifndef __IEEE_BIG_ENDIAN
#ifndef __IEEE_LITTLE_ENDIAN
#error Endianess not declared!!
#endif /* not __IEEE_LITTLE_ENDIAN */
#endif /* not __IEEE_BIG_ENDIAN */
#endif /* not __IEEE_LITTLE_ENDIAN */
#endif /* not __IEEE_BIG_ENDIAN */
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