Re: [PATCH 03/10] jscript: Added NaN value implementation.

[David Laight]

On Wed, Oct 15, 2008 at 04:50:30PM -0500, Jacek Caban wrote:
> Alexandre Julliard wrote:
> > I'd suggest to take advantage of the variant union instead of copying
> > all these glibc definitions. Something like
> >
> > #ifdef NAN
> >    V_R8(&vt) = NAN;
> > #else
> >    V_I8(&vt) = nan_magic_pattern;
> > #endif
>
> The problem is that nan_magic_pattern would have to be 8 bytes and AFAIK 
> there is no portable way to do it without ugly casts like in attached patch.

And that break C's 'strict aliasing' rules that gcc might apply
when optimising code.

David