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, 4) \
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, 4)
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 */
134