On Mar 15, 2004, at 09:34, Segher Boessenkool wrote:
> +/- 2**63, on i387.  Original pentium is supposed to be 1 ulp
> accurate for all valid inputs (no idea if it actually is).
>
> Don't know for other chips.

It's not. The argument reduction uses a 68-bit approximation
of pi, which means that for sin (pi) the argument retains
only about 4 significant bits and in this case results in
about 4 bits of precision in the output. We recently became
aware of this issue for Ada and are working on fixing this.

   -Geert