1 | /* Macros to control TS 18661-3 glibc features on x86. |
2 | Copyright (C) 2017 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 | <http://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. */ |
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 | |
45 | /* Defined to concatenate the literal suffix to be used with _Float128 |
46 | types, if __HAVE_FLOAT128 is 1. */ |
47 | #if __HAVE_FLOAT128 |
48 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
49 | /* The literal suffix f128 exists only since GCC 7.0. */ |
50 | # define __f128(x) x##q |
51 | # else |
52 | # define __f128(x) x##f128 |
53 | # endif |
54 | #endif |
55 | |
56 | /* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */ |
57 | #if __HAVE_FLOAT128 |
58 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
59 | /* Add a typedef for older GCC compilers which don't natively support |
60 | _Complex _Float128. */ |
61 | typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__))); |
62 | # define __CFLOAT128 __cfloat128 |
63 | # else |
64 | # define __CFLOAT128 _Complex _Float128 |
65 | # endif |
66 | #endif |
67 | |
68 | /* The remaining of this file provides support for older compilers. */ |
69 | #if __HAVE_FLOAT128 |
70 | |
71 | /* The type _Float128 exists only since GCC 7.0. */ |
72 | # if !__GNUC_PREREQ (7, 0) || defined __cplusplus |
73 | typedef __float128 _Float128; |
74 | # endif |
75 | |
76 | /* __builtin_huge_valf128 doesn't exist before GCC 7.0. */ |
77 | # if !__GNUC_PREREQ (7, 0) |
78 | # define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ()) |
79 | # endif |
80 | |
81 | /* Older GCC has only a subset of built-in functions for _Float128 on |
82 | x86, and __builtin_infq is not usable in static initializers. |
83 | Converting a narrower sNaN to _Float128 produces a quiet NaN, so |
84 | attempts to use _Float128 sNaNs will not work properly with older |
85 | compilers. */ |
86 | # if !__GNUC_PREREQ (7, 0) |
87 | # define __builtin_copysignf128 __builtin_copysignq |
88 | # define __builtin_fabsf128 __builtin_fabsq |
89 | # define __builtin_inff128() ((_Float128) __builtin_inf ()) |
90 | # define __builtin_nanf128(x) ((_Float128) __builtin_nan (x)) |
91 | # define __builtin_nansf128(x) ((_Float128) __builtin_nans (x)) |
92 | # endif |
93 | |
94 | /* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*, |
95 | e.g.: __builtin_signbitf128, before GCC 6. However, there has never |
96 | been a __builtin_signbitf128 in GCC and the type-generic builtin is |
97 | only available since GCC 6. */ |
98 | # if !__GNUC_PREREQ (6, 0) |
99 | # define __builtin_signbitf128 __signbitf128 |
100 | # endif |
101 | |
102 | #endif |
103 | |
104 | #endif /* _BITS_FLOATN_H */ |
105 | |