src/system/libroot/posix/glibc/include/arch/x86/bits/huge_val.h

   1 /* `HUGE_VAL' constants for ix86 (where it is infinity).
   2    Used by <stdlib.h> and <math.h> functions for overflow.
   3    Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _MATH_H
  22 # error "Never use <bits/huge_val.h> directly; include <math.h> instead."
  23 #endif
  24
  25 #include <features.h>
  26
  27 /* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
  28
  29 #if __GNUC_PREREQ(2,96)
  30 # define HUGE_VAL       (__extension__ 0x1.0p2047)
  31 #else
  32 # define __HUGE_VAL_bytes       { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
  33
  34 # define __huge_val_t   union { unsigned char __c[8]; double __d; }
  35 # ifdef __GNUC__
  36 #  define HUGE_VAL      (__extension__ \
  37                          ((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d)
  38 # else  /* Not GCC.  */
  39 static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
  40 #  define HUGE_VAL      (__huge_val.__d)
  41 # endif /* GCC.  */
  42 #endif /* GCC 2.95 */
  43
  44
  45 /* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL.  */
  46
  47 #ifdef __USE_ISOC99
  48
  49 # if __GNUC_PREREQ(2,96)
  50
  51 #  define HUGE_VALF (__extension__ 0x1.0p255f)
  52 #  define HUGE_VALL (__extension__ 0x1.0p32767L)
  53
  54 # else
  55
  56 #  define __HUGE_VALF_bytes     { 0, 0, 0x80, 0x7f }
  57
  58 #  define __huge_valf_t union { unsigned char __c[4]; float __f; }
  59 #  ifdef        __GNUC__
  60 #   define HUGE_VALF    (__extension__ \
  61                          ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f)
  62 #  else /* Not GCC.  */
  63 static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
  64 #   define HUGE_VALF    (__huge_valf.__f)
  65 #  endif        /* GCC.  */
  66
  67
  68 #  define __HUGE_VALL_bytes     { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
  69
  70 #  define __huge_vall_t union { unsigned char __c[12]; long double __ld; }
  71 #  ifdef __GNUC__
  72 #   define HUGE_VALL    (__extension__ \
  73                          ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
  74 #  else /* Not GCC.  */
  75 static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
  76 #   define HUGE_VALL    (__huge_vall.__ld)
  77 #  endif /* GCC.  */
  78
  79 # endif /* GCC 2.95 */
  80
  81 #endif  /* __USE_ISOC99.  */