diff options
Diffstat (limited to 'sysdeps/x86/bits')
| -rw-r--r-- | sysdeps/x86/bits/floatn.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/sysdeps/x86/bits/floatn.h b/sysdeps/x86/bits/floatn.h new file mode 100644 index 0000000000..23f74782ea --- /dev/null +++ b/sysdeps/x86/bits/floatn.h @@ -0,0 +1,96 @@ +/* Macros to control TS 18661-3 glibc features on x86. + Copyright (C) 2017 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 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 + +#endif + +#endif /* _BITS_FLOATN_H */ |