diff options
Diffstat (limited to 'sysdeps/ieee754/bits')
| -rw-r--r-- | sysdeps/ieee754/bits/huge_val.h | 89 | ||||
| -rw-r--r-- | sysdeps/ieee754/bits/nan.h | 63 |
2 files changed, 152 insertions, 0 deletions
diff --git a/sysdeps/ieee754/bits/huge_val.h b/sysdeps/ieee754/bits/huge_val.h new file mode 100644 index 0000000000..fe0144c734 --- /dev/null +++ b/sysdeps/ieee754/bits/huge_val.h @@ -0,0 +1,89 @@ +/* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity). + Used by <stdlib.h> and <math.h> functions for overflow. + Copyright (C) 1992, 1995, 1996, 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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_val.h> directly; include <math.h> instead." +#endif + + +#include <features.h> + +/* IEEE positive infinity (-HUGE_VAL is negative infinity). */ + +#ifdef __GNUC__ + +#define HUGE_VAL \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \ + { __l: 0x7ff0000000000000ULL }).__d) + +#else /* not GCC */ + +#include <sys/cdefs.h> +#include <endian.h> + +typedef union { unsigned char __c[8]; double __d; } __huge_val_t; + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } +#endif + +static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; +#define HUGE_VAL (__huge_val.__d) + +#endif /* GCC. */ + + +/* ISO C 9X extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ + +#ifdef __USE_ISOC9X + +#ifdef __GNUC__ + +#define HUGE_VALF \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \ + { __l: 0x7f800000UL }).__d) + +#else /* not GCC */ + +typedef union { unsigned char __c[4]; float __f; } __huge_valf_t; + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } +#endif + +static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; +#define HUGE_VALF (__huge_valf.__f) + +#endif /* GCC. */ + + +/* Generally there is no separate `long double' format and it is the + same as `double'. */ +#define HUGE_VALL HUGE_VAL + +#endif /* __USE_ISOC9X. */ diff --git a/sysdeps/ieee754/bits/nan.h b/sysdeps/ieee754/bits/nan.h new file mode 100644 index 0000000000..94988ced9c --- /dev/null +++ b/sysdeps/ieee754/bits/nan.h @@ -0,0 +1,63 @@ +/* `NAN' constant for IEEE 754 machines. + Copyright (C) 1992, 1996, 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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/nan.h> directly; include <math.h> instead." +#endif + + +/* IEEE Not A Number. */ + +#ifdef __GNUC__ + +# define NAN \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \ + { __l: 0x7ff8000000000000ULL }).__d) + +# define NANF \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \ + { __l: 0x7fc00000UL }).__d) + +#else + +# include <endian.h> + +# if __BYTE_ORDER == __BIG_ENDIAN +# define __nan_bytes { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 } +# define __nanf_bytes { 0x7f, 0xc0, 0, 0 } +# endif +# if __BYTE_ORDER == __LITTLE_ENDIAN +# define __nan_bytes { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f } +# define __nanf_bytes { 0, 0, 0xc0, 0x7f } +# endif + +static union { unsigned char __c[8]; double __d; } __nan = { __nan_bytes }; +# define NAN (__nan.__d) + +static union { unsigned char __c[4]; double __d; } __nanf = { __nanf_bytes }; +# define NANF (__nanf.__d) + +#endif /* GCC. */ + +/* Generally there is no separate `long double' format and it is the + same as `double'. */ + +#define NANL NAN |