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c86ed71d | 1 | /* Macros to control TS 18661-3 glibc features on x86. |
dff8da6b | 2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
c86ed71d JM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
c86ed71d JM |
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. */ | |
29 | #if (defined __x86_64__ \ | |
30 | ? __GNUC_PREREQ (4, 3) \ | |
31 | : (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4))) | |
32 | # define __HAVE_FLOAT128 1 | |
33 | #else | |
34 | # define __HAVE_FLOAT128 0 | |
35 | #endif | |
36 | ||
37 | /* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct | |
38 | from the default float, double and long double types in this glibc. */ | |
39 | #if __HAVE_FLOAT128 | |
40 | # define __HAVE_DISTINCT_FLOAT128 1 | |
41 | #else | |
42 | # define __HAVE_DISTINCT_FLOAT128 0 | |
43 | #endif | |
44 | ||
a23aa5b7 JM |
45 | /* Defined to 1 if the current compiler invocation provides a |
46 | floating-point type with the right format for _Float64x, and this | |
47 | glibc includes corresponding *f64x interfaces for it. */ | |
48 | #define __HAVE_FLOAT64X 1 | |
49 | ||
50 | /* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format | |
51 | of long double. Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has | |
52 | the format of _Float128, which must be different from that of long | |
53 | double. */ | |
54 | #define __HAVE_FLOAT64X_LONG_DOUBLE 1 | |
55 | ||
015c6dc2 JM |
56 | #ifndef __ASSEMBLER__ |
57 | ||
c86ed71d JM |
58 | /* Defined to concatenate the literal suffix to be used with _Float128 |
59 | types, if __HAVE_FLOAT128 is 1. */ | |
015c6dc2 | 60 | # if __HAVE_FLOAT128 |
3e5760fc | 61 | # if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) |
c86ed71d | 62 | /* The literal suffix f128 exists only since GCC 7.0. */ |
015c6dc2 JM |
63 | # define __f128(x) x##q |
64 | # else | |
65 | # define __f128(x) x##f128 | |
66 | # endif | |
c86ed71d | 67 | # endif |
c86ed71d JM |
68 | |
69 | /* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */ | |
015c6dc2 | 70 | # if __HAVE_FLOAT128 |
3e5760fc | 71 | # if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) |
c86ed71d JM |
72 | /* Add a typedef for older GCC compilers which don't natively support |
73 | _Complex _Float128. */ | |
74 | typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__))); | |
015c6dc2 JM |
75 | # define __CFLOAT128 __cfloat128 |
76 | # else | |
77 | # define __CFLOAT128 _Complex _Float128 | |
78 | # endif | |
c86ed71d | 79 | # endif |
c86ed71d JM |
80 | |
81 | /* The remaining of this file provides support for older compilers. */ | |
015c6dc2 | 82 | # if __HAVE_FLOAT128 |
c86ed71d JM |
83 | |
84 | /* The type _Float128 exists only since GCC 7.0. */ | |
3e5760fc | 85 | # if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0)) |
c86ed71d | 86 | typedef __float128 _Float128; |
015c6dc2 | 87 | # endif |
c86ed71d JM |
88 | |
89 | /* __builtin_huge_valf128 doesn't exist before GCC 7.0. */ | |
015c6dc2 JM |
90 | # if !__GNUC_PREREQ (7, 0) |
91 | # define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ()) | |
92 | # endif | |
c86ed71d JM |
93 | |
94 | /* Older GCC has only a subset of built-in functions for _Float128 on | |
95 | x86, and __builtin_infq is not usable in static initializers. | |
96 | Converting a narrower sNaN to _Float128 produces a quiet NaN, so | |
97 | attempts to use _Float128 sNaNs will not work properly with older | |
98 | compilers. */ | |
015c6dc2 JM |
99 | # if !__GNUC_PREREQ (7, 0) |
100 | # define __builtin_copysignf128 __builtin_copysignq | |
101 | # define __builtin_fabsf128 __builtin_fabsq | |
102 | # define __builtin_inff128() ((_Float128) __builtin_inf ()) | |
103 | # define __builtin_nanf128(x) ((_Float128) __builtin_nan (x)) | |
104 | # define __builtin_nansf128(x) ((_Float128) __builtin_nans (x)) | |
105 | # endif | |
c86ed71d | 106 | |
8466ee1c GG |
107 | /* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*, |
108 | e.g.: __builtin_signbitf128, before GCC 6. However, there has never | |
109 | been a __builtin_signbitf128 in GCC and the type-generic builtin is | |
110 | only available since GCC 6. */ | |
015c6dc2 JM |
111 | # if !__GNUC_PREREQ (6, 0) |
112 | # define __builtin_signbitf128 __signbitf128 | |
113 | # endif | |
114 | ||
8466ee1c GG |
115 | # endif |
116 | ||
015c6dc2 | 117 | #endif /* !__ASSEMBLER__. */ |
c86ed71d | 118 | |
797ba44b JM |
119 | #include <bits/floatn-common.h> |
120 | ||
c86ed71d | 121 | #endif /* _BITS_FLOATN_H */ |