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floatn.h
/* Macros to control TS 18661-3 glibc features on x86. Copyright (C) 2017-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _BITS_FLOATN_H #define _BITS_FLOATN_H #include <features.h> /* Defined to 1 if the current compiler invocation provides a floating-point type with the IEEE 754 binary128 format, and this glibc includes corresponding *f128 interfaces for it. The required libgcc support was added some time after the basic compiler support, for x86_64 and x86. */ #if (defined __x86_64__ \ ? __GNUC_PREREQ (4, 3) \ : (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4))) # define __HAVE_FLOAT128 1 #else # define __HAVE_FLOAT128 0 #endif /* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct from the default float, double and long double types in this glibc. */ #if __HAVE_FLOAT128 # define __HAVE_DISTINCT_FLOAT128 1 #else # define __HAVE_DISTINCT_FLOAT128 0 #endif /* Defined to 1 if the current compiler invocation provides a floating-point type with the right format for _Float64x, and this glibc includes corresponding *f64x interfaces for it. */ #define __HAVE_FLOAT64X 1 /* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format of long double. Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has the format of _Float128, which must be different from that of long double. */ #define __HAVE_FLOAT64X_LONG_DOUBLE 1 #ifndef __ASSEMBLER__ /* Defined to concatenate the literal suffix to be used with _Float128 types, if __HAVE_FLOAT128 is 1. */ # if __HAVE_FLOAT128 # if !__GNUC_PREREQ (7, 0) || defined __cplusplus /* The literal suffix f128 exists only since GCC 7.0. */ # define __f128(x) x##q # else # define __f128(x) x##f128 # endif # endif /* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */ # if __HAVE_FLOAT128 # if !__GNUC_PREREQ (7, 0) || defined __cplusplus /* Add a typedef for older GCC compilers which don't natively support _Complex _Float128. */ typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__))); # define __CFLOAT128 __cfloat128 # else # define __CFLOAT128 _Complex _Float128 # endif # endif /* The remaining of this file provides support for older compilers. */ # if __HAVE_FLOAT128 /* The type _Float128 exists only since GCC 7.0. */ # if !__GNUC_PREREQ (7, 0) || defined __cplusplus typedef __float128 _Float128; # endif /* __builtin_huge_valf128 doesn't exist before GCC 7.0. */ # if !__GNUC_PREREQ (7, 0) # define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ()) # endif /* Older GCC has only a subset of built-in functions for _Float128 on x86, and __builtin_infq is not usable in static initializers. Converting a narrower sNaN to _Float128 produces a quiet NaN, so attempts to use _Float128 sNaNs will not work properly with older compilers. */ # if !__GNUC_PREREQ (7, 0) # define __builtin_copysignf128 __builtin_copysignq # define __builtin_fabsf128 __builtin_fabsq # define __builtin_inff128() ((_Float128) __builtin_inf ()) # define __builtin_nanf128(x) ((_Float128) __builtin_nan (x)) # define __builtin_nansf128(x) ((_Float128) __builtin_nans (x)) # endif /* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*, e.g.: __builtin_signbitf128, before GCC 6. However, there has never been a __builtin_signbitf128 in GCC and the type-generic builtin is only available since GCC 6. */ # if !__GNUC_PREREQ (6, 0) # define __builtin_signbitf128 __signbitf128 # endif # endif #endif /* !__ASSEMBLER__. */ #include <bits/floatn-common.h> #endif /* _BITS_FLOATN_H */
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