On Mon, May 13, 2002 at 11:13:58AM -0700, Bill Fenner wrote:
>
> 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.
signbit isn't limited to lvalues, is it? You'll have to handle eg
signbit(3.0) too.
Stefan Farfeleder
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