/* `HUGE_VAL' constants for ix86 (where it is infinity). Used by and functions for overflow. Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 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 directly; include instead." #endif #include /* IEEE positive infinity (-HUGE_VAL is negative infinity). */ #if __GNUC_PREREQ(2,95) # define HUGE_VAL (__extension__ 0x1.0p2047) #else # define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } # define __huge_val_t union { unsigned char __c[8]; double __d; } # ifdef __GNUC__ # define HUGE_VAL (__extension__ \ ((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d) # else /* Not GCC. */ static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; # define HUGE_VAL (__huge_val.__d) # endif /* GCC. */ #endif /* GCC 2.95 */ /* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ #ifdef __USE_ISOC99 # if __GNUC_PREREQ(2,95) # define HUGE_VALF (__extension__ 0x1.0p255f) # define HUGE_VALL (__extension__ 0x1.0p32767L) # else # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } # define __huge_valf_t union { unsigned char __c[4]; float __f; } # ifdef __GNUC__ # define HUGE_VALF (__extension__ \ ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f) # else /* Not GCC. */ static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; # define HUGE_VALF (__huge_valf.__f) # endif /* GCC. */ # define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } # define __huge_vall_t union { unsigned char __c[12]; long double __ld; } # ifdef __GNUC__ # define HUGE_VALL (__extension__ \ ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld) # else /* Not GCC. */ static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; # define HUGE_VALL (__huge_vall.__ld) # endif /* GCC. */ # endif /* GCC 2.95 */ #endif /* __USE_ISOC99. */