sysdeps/s390/bits/huge_val.h

   1 /* `HUGE_VAL' constants for s390 (where it is infinity).
   2    Used by <stdlib.h> and <math.h> functions for overflow.
   3    Copyright (C) 2000 Free Software Foundation, Inc.
   4    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _MATH_H
  23 # error "Never use <bits/huge_val.h> directly; include <math.h> instead."
  24 #endif
  25
  26 #include <features.h>
  27
  28 /* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
  29
  30 #if __GNUC_PREREQ(2,96)
  31 # define HUGE_VAL       (__extension__ 0x1.0p2047)
  32 #else
  33 #define __HUGE_VAL_bytes        { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
  34
  35 #define __huge_val_t    union { unsigned char __c[8]; double __d; }
  36 #ifdef  __GNUC__
  37 # define HUGE_VAL       (__extension__ \
  38                          ((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d)
  39 #else   /* Not GCC.  */
  40 static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
  41 # define HUGE_VAL       (__huge_val.__d)
  42 #endif  /* GCC.  */
  43 #endif /* GCC 2.95 */
  44
  45
  46 /* ISO C 99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL.  */
  47
  48 #ifdef __USE_ISOC99
  49
  50 # if __GNUC_PREREQ(2,96)
  51
  52 #  define HUGE_VALF (__extension__ 0x1.0p255f)
  53 #  define HUGE_VALL (__extension__ 0x1.0p255f)
  54
  55 # else
  56
  57 # define __HUGE_VALF_bytes      { 0x7f, 0x80, 0, 0 }
  58
  59 # define __huge_valf_t  union { unsigned char __c[4]; float __f; }
  60 # ifdef __GNUC__
  61 #  define HUGE_VALF     (__extension__ \
  62                          ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f)
  63 # else  /* Not GCC.  */
  64 static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
  65 #  define HUGE_VALF     (__huge_valf.__f)
  66 # endif /* GCC.  */
  67
  68 /* On 390 there is no 'long double' format. Make it the same as 'double' */
  69 # define HUGE_VALL HUGE_VAL
  70
  71 # endif /* GCC 2.95 */
  72
  73 #endif  /* __USE_ISOC99.  */