diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/bits/huge_vall.h')
-rw-r--r-- | sysdeps/ieee754/ldbl-128/bits/huge_vall.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/bits/huge_vall.h b/sysdeps/ieee754/ldbl-128/bits/huge_vall.h new file mode 100644 index 0000000..d22a949 --- /dev/null +++ b/sysdeps/ieee754/ldbl-128/bits/huge_vall.h @@ -0,0 +1,51 @@ +/* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity). + Used by <stdlib.h> and <math.h> functions for overflow. + Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004 + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _MATH_H +# error "Never use <bits/huge_vall.h> directly; include <math.h> instead." +#endif + +/* IEEE positive infinity (-HUGE_VAL is negative infinity). */ + +#if __GNUC_PREREQ(3,3) +# define HUGE_VALL (__builtin_huge_vall()) +#elif __GNUC_PREREQ(2,96) +# define HUGE_VALL (__extension__ 0x1.0p32767L) +#else +# include <endian.h> + +typedef union { unsigned char __c[16]; long double __ld; } __huge_vall_t; + +# if __BYTE_ORDER == __BIG_ENDIAN +# define __HUGE_VALL_bytes { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 } +# endif +# if __BYTE_ORDER == __LITTLE_ENDIAN +# define __HUGE_VALL_bytes { 0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0xff, 0x7f } +# endif + +# ifdef __GNUC__ +# define HUGE_VALL (__extension__ \ + ((__huge_vall_t) { __c : __HUGE_VALL_bytes }).__ld) +# else +static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; +# define HUGE_VALL (__huge_val.__d) +# endif +#endif |