sysdeps/x86/bits/floatn.h

   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 */