| 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. */ |
| 83 | typedef _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) |
| 97 | typedef __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 */ |