It's easy if it's easy to treat doubles as uint64_t's. Like, I think
signbit() might be something like
#define signbit(d) (*((uint64_t *)&(d)) & UINT64_C(0x8000000000000000))
or maybe
#define signbit(d) (*((uint64_t *)&(d)) >> 63)
However, that assumes that d is an IEEE double (and there is a
possibly-incorrect assumption about byte order). I don't know how to
implement a macro that will take any real-floating type.
Bill
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