1/* Macros to control TS 18661-3 glibc features on x86.
  2   Copyright (C) 2017-2025 Free Software Foundation, Inc.
  3   This file is part of the GNU C Library.
  4
  5   The GNU C Library is free software; you can redistribute it and/or
  6   modify it under the terms of the GNU Lesser General Public
  7   License as published by the Free Software Foundation; either
  8   version 2.1 of the License, or (at your option) any later version.
  9
 10   The GNU C Library is distributed in the hope that it will be useful,
 11   but WITHOUT ANY WARRANTY; without even the implied warranty of
 12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 13   Lesser General Public License for more details.
 14
 15   You should have received a copy of the GNU Lesser General Public
 16   License along with the GNU C Library; if not, see
 17   <https://www.gnu.org/licenses/>.  */
 18
 19#ifndef _BITS_FLOATN_H
 20#define _BITS_FLOATN_H
 21
 22#include <features.h>
 23
 24/* Defined to 1 if the current compiler invocation provides a
 25   floating-point type with the IEEE 754 binary128 format, and this
 26   glibc includes corresponding *f128 interfaces for it.  The required
 27   libgcc support was added some time after the basic compiler
 28   support, for x86_64 and x86.  Intel SYCL compiler doesn't support
 29   _Float128: https://github.com/intel/llvm/issues/16903
 30  */
 31#if (defined __x86_64__							\
 32     ? __GNUC_PREREQ (4, 3)						\
 33     : (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4))) \
 34    || (__glibc_clang_prereq (3, 9)					\
 35	&& (!defined __INTEL_LLVM_COMPILER				\
 36	    || !defined SYCL_LANGUAGE_VERSION))
 37# define __HAVE_FLOAT128 1
 38#else
 39# define __HAVE_FLOAT128 0
 40#endif
 41
 42/* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct
 43   from the default float, double and long double types in this glibc.  */
 44#if __HAVE_FLOAT128
 45# define __HAVE_DISTINCT_FLOAT128 1
 46#else
 47# define __HAVE_DISTINCT_FLOAT128 0
 48#endif
 49
 50/* Defined to 1 if the current compiler invocation provides a
 51   floating-point type with the right format for _Float64x, and this
 52   glibc includes corresponding *f64x interfaces for it.  */
 53#define __HAVE_FLOAT64X 1
 54
 55/* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format
 56   of long double.  Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has
 57   the format of _Float128, which must be different from that of long
 58   double.  */
 59#define __HAVE_FLOAT64X_LONG_DOUBLE 1
 60
 61#ifndef __ASSEMBLER__
 62
 63/* Defined to concatenate the literal suffix to be used with _Float128
 64   types, if __HAVE_FLOAT128 is 1. */
 65# if __HAVE_FLOAT128
 66#  if !__GNUC_PREREQ (7, 0) \
 67      || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
 68      || defined __clang__
 69/* The literal suffix f128 exists only since GCC 7.0.  */
 70#   define __f128(x) x##q
 71#  else
 72#   define __f128(x) x##f128
 73#  endif
 74# endif
 75
 76/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1.  */
 77# if __HAVE_FLOAT128
 78#  if !__GNUC_PREREQ (7, 0) \
 79      || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
 80      || defined __clang__
 81/* Add a typedef for older GCC compilers which don't natively support
 82   _Complex _Float128.  */
 83typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
 84#   define __CFLOAT128 __cfloat128
 85#  else
 86#   define __CFLOAT128 _Complex _Float128
 87#  endif
 88# endif
 89
 90/* The remaining of this file provides support for older compilers.  */
 91# if __HAVE_FLOAT128
 92
 93/* The type _Float128 exists only since GCC 7.0.  */
 94#  if !__GNUC_PREREQ (7, 0) \
 95      || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
 96      || __glibc_clang_prereq (3, 9)
 97typedef __float128 _Float128;
 98#  endif
 99
100/* __builtin_huge_valf128 doesn't exist before GCC 7.0 nor Clang 7.0.  */
101#  if !__GNUC_PREREQ (7, 0) && !__glibc_clang_prereq (7, 0)
102#   define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ())
103#  endif
104
105/* Older GCC has only a subset of built-in functions for _Float128 on
106   x86, and __builtin_infq is not usable in static initializers.
107   Converting a narrower sNaN to _Float128 produces a quiet NaN, so
108   attempts to use _Float128 sNaNs will not work properly with older
109   compilers.  */
110#  if !__GNUC_PREREQ (7, 0) && !defined __clang__
111#   define __builtin_copysignf128 __builtin_copysignq
112#   define __builtin_fabsf128 __builtin_fabsq
113#   define __builtin_inff128() ((_Float128) __builtin_inf ())
114#   define __builtin_nanf128(x) ((_Float128) __builtin_nan (x))
115#   define __builtin_nansf128(x) ((_Float128) __builtin_nans (x))
116#  endif
117
118/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
119   e.g.: __builtin_signbitf128, before GCC 6.  However, there has never
120   been a __builtin_signbitf128 in GCC and the type-generic builtin is
121   only available since GCC 6.  signbit is expanded to __builtin_signbit
122   after Clang 3.3.  */
123#  if !__GNUC_PREREQ (6, 0)
124#   define __builtin_signbitf128 __signbitf128
125#  endif
126
127# endif
128
129#endif /* !__ASSEMBLER__.  */
130
131#include <bits/floatn-common.h>
132
133#endif /* _BITS_FLOATN_H */