--- /dev/null
+/* Macros to control TS 18661-3 glibc features where the same
+ definitions are appropriate for all platforms.
+ Copyright (C) 2017-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _BITS_FLOATN_COMMON_H
+#define _BITS_FLOATN_COMMON_H
+
+#include <features.h>
+#include <bits/long-double.h>
+
+/* This header should be included at the bottom of each bits/floatn.h.
+ It defines the following macros for each _FloatN and _FloatNx type,
+ where the same definitions, or definitions based only on the macros
+ in bits/floatn.h, are appropriate for all glibc configurations. */
+
+/* Defined to 1 if the current compiler invocation provides a
+ floating-point type with the right format for this type, and this
+ glibc includes corresponding *fN or *fNx interfaces for it. */
+#define __HAVE_FLOAT16 0
+#define __HAVE_FLOAT32 1
+#define __HAVE_FLOAT64 1
+#define __HAVE_FLOAT32X 1
+#define __HAVE_FLOAT128X 0
+
+/* Defined to 1 if the corresponding __HAVE_<type> macro is 1 and the
+ type is the first with its format in the sequence of (the default
+ choices for) float, double, long double, _Float16, _Float32,
+ _Float64, _Float128, _Float32x, _Float64x, _Float128x for this
+ glibc; that is, if functions present once per floating-point format
+ rather than once per type are present for this type.
+
+ All configurations supported by glibc have _Float32 the same format
+ as float, _Float64 and _Float32x the same format as double, the
+ _Float64x the same format as either long double or _Float128. No
+ configurations support _Float128x or, as of GCC 7, have compiler
+ support for a type meeting the requirements for _Float128x. */
+#define __HAVE_DISTINCT_FLOAT16 __HAVE_FLOAT16
+#define __HAVE_DISTINCT_FLOAT32 0
+#define __HAVE_DISTINCT_FLOAT64 0
+#define __HAVE_DISTINCT_FLOAT32X 0
+#define __HAVE_DISTINCT_FLOAT64X 0
+#define __HAVE_DISTINCT_FLOAT128X __HAVE_FLOAT128X
+
+/* Defined to 1 if the corresponding _FloatN type is not binary compatible
+ with the corresponding ISO C type in the current compilation unit as
+ opposed to __HAVE_DISTINCT_FLOATN, which indicates the default types built
+ in glibc. */
+#define __HAVE_FLOAT128_UNLIKE_LDBL (__HAVE_DISTINCT_FLOAT128 \
+ && __LDBL_MANT_DIG__ != 113)
+
+/* Defined to 1 if any _FloatN or _FloatNx types that are not
+ ABI-distinct are however distinct types at the C language level (so
+ for the purposes of __builtin_types_compatible_p and _Generic). */
+#if __GNUC_PREREQ (7, 0) && !defined __cplusplus
+# define __HAVE_FLOATN_NOT_TYPEDEF 1
+#else
+# define __HAVE_FLOATN_NOT_TYPEDEF 0
+#endif
+
+#ifndef __ASSEMBLER__
+
+/* Defined to concatenate the literal suffix to be used with _FloatN
+ or _FloatNx types, if __HAVE_<type> is 1. The corresponding
+ literal suffixes exist since GCC 7, for C only. */
+# if __HAVE_FLOAT16
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+/* No corresponding suffix available for this type. */
+# define __f16(x) ((_Float16) x##f)
+# else
+# define __f16(x) x##f16
+# endif
+# endif
+
+# if __HAVE_FLOAT32
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# define __f32(x) x##f
+# else
+# define __f32(x) x##f32
+# endif
+# endif
+
+# if __HAVE_FLOAT64
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# ifdef __NO_LONG_DOUBLE_MATH
+# define __f64(x) x##l
+# else
+# define __f64(x) x
+# endif
+# else
+# define __f64(x) x##f64
+# endif
+# endif
+
+# if __HAVE_FLOAT32X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# define __f32x(x) x
+# else
+# define __f32x(x) x##f32x
+# endif
+# endif
+
+# if __HAVE_FLOAT64X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# if __HAVE_FLOAT64X_LONG_DOUBLE
+# define __f64x(x) x##l
+# else
+# define __f64x(x) __f128 (x)
+# endif
+# else
+# define __f64x(x) x##f64x
+# endif
+# endif
+
+# if __HAVE_FLOAT128X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# error "_Float128X supported but no constant suffix"
+# else
+# define __f128x(x) x##f128x
+# endif
+# endif
+
+/* Defined to a complex type if __HAVE_<type> is 1. */
+# if __HAVE_FLOAT16
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef _Complex float __cfloat16 __attribute__ ((__mode__ (__HC__)));
+# define __CFLOAT16 __cfloat16
+# else
+# define __CFLOAT16 _Complex _Float16
+# endif
+# endif
+
+# if __HAVE_FLOAT32
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# define __CFLOAT32 _Complex float
+# else
+# define __CFLOAT32 _Complex _Float32
+# endif
+# endif
+
+# if __HAVE_FLOAT64
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# ifdef __NO_LONG_DOUBLE_MATH
+# define __CFLOAT64 _Complex long double
+# else
+# define __CFLOAT64 _Complex double
+# endif
+# else
+# define __CFLOAT64 _Complex _Float64
+# endif
+# endif
+
+# if __HAVE_FLOAT32X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# define __CFLOAT32X _Complex double
+# else
+# define __CFLOAT32X _Complex _Float32x
+# endif
+# endif
+
+# if __HAVE_FLOAT64X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# if __HAVE_FLOAT64X_LONG_DOUBLE
+# define __CFLOAT64X _Complex long double
+# else
+# define __CFLOAT64X __CFLOAT128
+# endif
+# else
+# define __CFLOAT64X _Complex _Float64x
+# endif
+# endif
+
+# if __HAVE_FLOAT128X
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# error "_Float128X supported but no complex type"
+# else
+# define __CFLOAT128X _Complex _Float128x
+# endif
+# endif
+
+/* The remaining of this file provides support for older compilers. */
+# if __HAVE_FLOAT16
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef float _Float16 __attribute__ ((__mode__ (__HF__)));
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf16() ((_Float16) __builtin_huge_val ())
+# define __builtin_inff16() ((_Float16) __builtin_inf ())
+# define __builtin_nanf16(x) ((_Float16) __builtin_nan (x))
+# define __builtin_nansf16(x) ((_Float16) __builtin_nans (x))
+# endif
+
+# endif
+
+# if __HAVE_FLOAT32
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef float _Float32;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf32() (__builtin_huge_valf ())
+# define __builtin_inff32() (__builtin_inff ())
+# define __builtin_nanf32(x) (__builtin_nanf (x))
+# define __builtin_nansf32(x) (__builtin_nansf (x))
+# endif
+
+# endif
+
+# if __HAVE_FLOAT64
+
+/* If double, long double and _Float64 all have the same set of
+ values, TS 18661-3 requires the usual arithmetic conversions on
+ long double and _Float64 to produce _Float64. For this to be the
+ case when building with a compiler without a distinct _Float64
+ type, _Float64 must be a typedef for long double, not for
+ double. */
+
+# ifdef __NO_LONG_DOUBLE_MATH
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef long double _Float64;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf64() (__builtin_huge_vall ())
+# define __builtin_inff64() (__builtin_infl ())
+# define __builtin_nanf64(x) (__builtin_nanl (x))
+# define __builtin_nansf64(x) (__builtin_nansl (x))
+# endif
+
+# else
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef double _Float64;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf64() (__builtin_huge_val ())
+# define __builtin_inff64() (__builtin_inf ())
+# define __builtin_nanf64(x) (__builtin_nan (x))
+# define __builtin_nansf64(x) (__builtin_nans (x))
+# endif
+
+# endif
+
+# endif
+
+# if __HAVE_FLOAT32X
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef double _Float32x;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf32x() (__builtin_huge_val ())
+# define __builtin_inff32x() (__builtin_inf ())
+# define __builtin_nanf32x(x) (__builtin_nan (x))
+# define __builtin_nansf32x(x) (__builtin_nans (x))
+# endif
+
+# endif
+
+# if __HAVE_FLOAT64X
+
+# if __HAVE_FLOAT64X_LONG_DOUBLE
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef long double _Float64x;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf64x() (__builtin_huge_vall ())
+# define __builtin_inff64x() (__builtin_infl ())
+# define __builtin_nanf64x(x) (__builtin_nanl (x))
+# define __builtin_nansf64x(x) (__builtin_nansl (x))
+# endif
+
+# else
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef _Float128 _Float64x;
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf64x() (__builtin_huge_valf128 ())
+# define __builtin_inff64x() (__builtin_inff128 ())
+# define __builtin_nanf64x(x) (__builtin_nanf128 (x))
+# define __builtin_nansf64x(x) (__builtin_nansf128 (x))
+# endif
+
+# endif
+
+# endif
+
+# if __HAVE_FLOAT128X
+
+# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+# error "_Float128x supported but no type"
+# endif
+
+# if !__GNUC_PREREQ (7, 0)
+# define __builtin_huge_valf128x() ((_Float128x) __builtin_huge_val ())
+# define __builtin_inff128x() ((_Float128x) __builtin_inf ())
+# define __builtin_nanf128x(x) ((_Float128x) __builtin_nan (x))
+# define __builtin_nansf128x(x) ((_Float128x) __builtin_nans (x))
+# endif
+
+# endif
+
+#endif /* !__ASSEMBLER__. */
+
+#endif /* _BITS_FLOATN_COMMON_H */
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