Re: [f-cpu] New EU_SHL Instruction

[Yann Guidon <whygee@f-cpu.org>]

hi !

Michael Riepe wrote:

> On Thu, Jan 09, 2003 at 01:59:11AM +0100, Yann Guidon wrote:
> [...]
>  
> > > I do not remember an `sdup' instruction that uses three operands, nor
> > > did I implement one. That would have been another logical extension;
> > > but I guess that vperm is more useful. BTW: if you're satisfied with
> > > an immediate operand, `svseli $n, r2, r1' will do what you want
> > > (duplicate chunk <n> of r2). 
> > it's not doing sdup completely. The 3rd register operand is useful to 
> > avoid a shift
> > in front of a "bare" sdup :
> > sdup  r1, r2, r3
> > replaces
> > shiftr r1*8, r2, r2
> > sdup r2, r3
> >    
> Implemented, with both register and immediate operand.
> `vsel' is now a superset of `sdup'. Satisfied?
i guess so ;-)
but please keep an alias for sdup because i will not always remember
this "superset" thing :-)

YG

PS: i still think that "vsel" is not a cool name :-)

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