RE: Glib bithacks

["Turner, David" <DTurner nds com>]

> Le vendredi 04 novembre 2005 à 20:29 -0600, Federico Mena Quintero a
> écrit :
> > On Fri, 2005-11-04 at 20:23 -0500, Behdad Esfahbod wrote:
> > > +#define IS(Type, Class)        (((guint)1 << (Type)) & (Class) ?
> > > 1 : 0)
> > > +#define OR(Type, Rest) (((guint)1 << (Type)) | (Rest))
> 
> impressive ! i'm sad that gcc doesn't do it by itself. Maybe a bug
> should be filled because this kind of optimization is great.
> 
It's not a bug, that's what happen when you lack proper abstract data
types. It's one of these cases where fixing the language is easier than
fixing the compiler :-)

Regards,

- David Turner

> Having a look at assembly ...
> 
> instructions :
> 
> 	pango	| behad
> ISDIGIT	  5	|   5
> ISALPHA	  13	|   4
> ISMARK	  9	|   4
> 
> 
> branching instructions :
> 
> 	pango	| behad
> ISDIGIT	  0	|   0
> ISALPHA	  4	|   0
> ISMARK	  2	|   0
> 	
> amazing :)
> 
> -- 
> Benoît Dejean <benoit placenet org>
> 
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