| 1 | /* Macros to control TS 18661-3 glibc features on x86. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _BITS_FLOATN_H |
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| 20 | #define _BITS_FLOATN_H |
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| 21 | |
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| 22 | #include <features.h> |
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| 23 | |
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| 24 | /* Defined to 1 if the current compiler invocation provides a |
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| 25 | floating-point type with the IEEE 754 binary128 format, and this |
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| 26 | glibc includes corresponding *f128 interfaces for it. The required |
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| 27 | libgcc support was added some time after the basic compiler |
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| 28 | support, for x86_64 and x86. */ |
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| 29 | #if (defined __x86_64__ \ |
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| 30 | ? __GNUC_PREREQ (4, 3) \ |
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| 31 | : (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4))) |
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| 32 | # define __HAVE_FLOAT128 1 |
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| 33 | #else |
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| 34 | # define __HAVE_FLOAT128 0 |
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| 35 | #endif |
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| 36 | |
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| 37 | /* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct |
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| 38 | from the default float, double and long double types in this glibc. */ |
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| 39 | #if __HAVE_FLOAT128 |
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| 40 | # define __HAVE_DISTINCT_FLOAT128 1 |
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| 41 | #else |
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| 42 | # define __HAVE_DISTINCT_FLOAT128 0 |
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| 43 | #endif |
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| 44 | |
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| 45 | /* Defined to 1 if the current compiler invocation provides a |
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| 46 | floating-point type with the right format for _Float64x, and this |
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| 47 | glibc includes corresponding *f64x interfaces for it. */ |
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| 48 | #define __HAVE_FLOAT64X 1 |
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| 49 | |
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| 50 | /* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format |
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| 51 | of long double. Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has |
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| 52 | the format of _Float128, which must be different from that of long |
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| 53 | double. */ |
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| 54 | #define __HAVE_FLOAT64X_LONG_DOUBLE 1 |
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| 55 | |
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| 56 | #ifndef __ASSEMBLER__ |
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| 57 | |
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| 58 | /* Defined to concatenate the literal suffix to be used with _Float128 |
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| 59 | types, if __HAVE_FLOAT128 is 1. */ |
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| 60 | # if __HAVE_FLOAT128 |
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| 61 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
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| 62 | /* The literal suffix f128 exists only since GCC 7.0. */ |
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| 63 | # define __f128(x) x##q |
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| 64 | # else |
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| 65 | # define __f128(x) x##f128 |
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| 66 | # endif |
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| 67 | # endif |
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| 68 | |
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| 69 | /* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */ |
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| 70 | # if __HAVE_FLOAT128 |
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| 71 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
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| 72 | /* Add a typedef for older GCC compilers which don't natively support |
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| 73 | _Complex _Float128. */ |
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| 74 | typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__))); |
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| 75 | # define __CFLOAT128 __cfloat128 |
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| 76 | # else |
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| 77 | # define __CFLOAT128 _Complex _Float128 |
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| 78 | # endif |
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| 79 | # endif |
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| 80 | |
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| 81 | /* The remaining of this file provides support for older compilers. */ |
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| 82 | # if __HAVE_FLOAT128 |
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| 83 | |
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| 84 | /* The type _Float128 exists only since GCC 7.0. */ |
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| 85 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
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| 86 | typedef __float128 _Float128; |
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| 87 | # endif |
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| 88 | |
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| 89 | /* __builtin_huge_valf128 doesn't exist before GCC 7.0. */ |
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| 90 | # if !__GNUC_PREREQ (7, 0) |
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| 91 | # define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ()) |
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| 92 | # endif |
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| 93 | |
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| 94 | /* Older GCC has only a subset of built-in functions for _Float128 on |
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| 95 | x86, and __builtin_infq is not usable in static initializers. |
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| 96 | Converting a narrower sNaN to _Float128 produces a quiet NaN, so |
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| 97 | attempts to use _Float128 sNaNs will not work properly with older |
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| 98 | compilers. */ |
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| 99 | # if !__GNUC_PREREQ (7, 0) |
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| 100 | # define __builtin_copysignf128 __builtin_copysignq |
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| 101 | # define __builtin_fabsf128 __builtin_fabsq |
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| 102 | # define __builtin_inff128() ((_Float128) __builtin_inf ()) |
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| 103 | # define __builtin_nanf128(x) ((_Float128) __builtin_nan (x)) |
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| 104 | # define __builtin_nansf128(x) ((_Float128) __builtin_nans (x)) |
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| 105 | # endif |
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| 106 | |
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| 107 | /* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*, |
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| 108 | e.g.: __builtin_signbitf128, before GCC 6. However, there has never |
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| 109 | been a __builtin_signbitf128 in GCC and the type-generic builtin is |
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| 110 | only available since GCC 6. */ |
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| 111 | # if !__GNUC_PREREQ (6, 0) |
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| 112 | # define __builtin_signbitf128 __signbitf128 |
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| 113 | # endif |
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| 114 | |
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| 115 | # endif |
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| 116 | |
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| 117 | #endif /* !__ASSEMBLER__. */ |
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| 118 | |
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| 119 | #include <bits/floatn-common.h> |
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| 120 | |
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| 121 | #endif /* _BITS_FLOATN_H */ |
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| 122 | |
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