1 /* Macros to control TS 18661-3 glibc features on x86. 2 Copyright (C) 2017-2021 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. */ 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 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 56 #ifndef __ASSEMBLER__ 57 58 /* Defined to concatenate the literal suffix to be used with _Float128 59 types, if __HAVE_FLOAT128 is 1. */ 60 # if __HAVE_FLOAT128 61 # if !__GNUC_PREREQ (7, 0) || defined __cplusplus 62 /* The literal suffix f128 exists only since GCC 7.0. */ 63 # define __f128(x) x##q 64 # else 65 # define __f128(x) x##f128 66 # endif 67 # endif 68 69 /* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */ 70 # if __HAVE_FLOAT128 71 # if !__GNUC_PREREQ (7, 0) || defined __cplusplus 72 /* Add a typedef for older GCC compilers which don't natively support 73 _Complex _Float128. */ 74 typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__))); 75 # define __CFLOAT128 __cfloat128 76 # else 77 # define __CFLOAT128 _Complex _Float128 78 # endif 79 # endif 80 81 /* The remaining of this file provides support for older compilers. */ 82 # if __HAVE_FLOAT128 83 84 /* The type _Float128 exists only since GCC 7.0. */ 85 # if !__GNUC_PREREQ (7, 0) || defined __cplusplus 86 typedef __float128 _Float128; 87 # endif 88 89 /* __builtin_huge_valf128 doesn't exist before GCC 7.0. */ 90 # if !__GNUC_PREREQ (7, 0) 91 # define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ()) 92 # endif 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. */ 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 106 107 /* 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. */ 111 # if !__GNUC_PREREQ (6, 0) 112 # define __builtin_signbitf128 __signbitf128 113 # endif 114 115 # endif 116 117 #endif /* !__ASSEMBLER__. */ 118 119 #include <bits/floatn-common.h> 120 121 #endif /* _BITS_FLOATN_H */