> On Wed, 23 May 2001, Anders Magnusson wrote:
> 
> > insque/remque are used to manipulate the process queues, yes.
> > scanc/skpc are used by the ffs code.
> > movc3/movc5/locc are used for memcpy/memset/strlen (bcopy/bzero/...)
> > ffs is just ffs(3).
> >
> > libc only uses a few of them because there are VAXen that do not have
> > them in hardware that gets extremely slow if those isns's are used...
> 
> 	Are there any compile time options to control the use of them?
> 	I can't see anything in the gcc info page. Would it make sense
> 	to add any so those with more 'instruction rich' CPUs could
> 	elect to recompile to gain more speed, something akin to -mcpu=v8
> 	on a sparc box. Hmmm, presumably that could also be useful if
> 	the cost of scheduling instructions varies between different
> 	vaxes. At the evry last it could be set automatically in kernel
> 	compiles when targeting specific vax models.
> 
gcc don't use them, and I don't know if there would be of any use to 
learn gcc about them. If something should be done then I think that
it would be two different libc's and do something like the x86 libm 
changing.

-- Ragge