> David Brownlee wrote:
> 
> > > >     Are there any compile time options to control the use of them?
> 
> > > gcc don't use them, and I don't know if there would be of any use to
> > > learn gcc about them.
> 
> Well, take the bit field instructions for example, they would be
> very useful for gcc to know when dealing with bit fields: otherwise
> it's just gonna be more work with and / shift right and shift left / or
> respectively.
>  
gcc both knows and uses the bitfield insn's (extzv et al).

-- Ragge