int __signbitl(long double);
#define signbit(x) ( \
- sizeof(x) == sizeof(float) ? __FLOAT_BITS(x) & 0x80000000 : \
- sizeof(x) == sizeof(double) ? __DOUBLE_BITS(x) & (__uint64_t)1<<63 : \
+ sizeof(x) == sizeof(float) ? !!(__FLOAT_BITS(x) & 0x80000000) : \
+ sizeof(x) == sizeof(double) ? !!(__DOUBLE_BITS(x) & (__uint64_t)1<<63) : \
__signbitl(x) )
#define isunordered(x,y) (isnan((x)) ? ((void)(y),1) : isnan((y)))