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- #ifndef _MATH_H
- # error "Never use <bits/huge_val.h> directly; include <math.h> instead."
- #endif
- #if __GNUC_PREREQ(3,3)
- # define HUGE_VAL (__builtin_huge_val())
- #elif __GNUC_PREREQ(2,96)
- # define HUGE_VAL (__extension__ 0x1.0p2047)
- #elif defined __GNUC__
- # define HUGE_VAL \
- (__extension__ \
- ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
- { __l: 0x000000007ff00000ULL }).__d)
- #else
- # include <endian.h>
- typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
- # if __BYTE_ORDER == __BIG_ENDIAN
- # define __HUGE_VAL_bytes { 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 }
- # endif
- # if __BYTE_ORDER == __LITTLE_ENDIAN
- # define __HUGE_VAL_bytes { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 }
- # endif
- static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
- # define HUGE_VAL (__huge_val.__d)
- #endif
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