Re: new do-count rtl

[Doug Evans <dje at sebabeach dot org>]

Dave Korn wrote:
> Doug Evans wrote:
>   
> > Doug Evans wrote:
> >     
> > > Hi.
> > >
> > > What do folks think of adding a new rtl for iterating a specified
> > > number of times.
> > >
> > > Something like
> > >
> > > (do-count nr-times iter-var expr1 [expr2 ...])
> > >
> > > For now the result would always be void, and iter-var would always
> > > have mode INT.
> > > The set of expressions is performed nr-times times and iter-var has
> > > values 0 ... nr-times - 1.
> > >
> > > ?
> > >
> > >       
> > Checked in.
> >     
>
>   I don't speak scheme or guile, but I'm learning, so forgive me in advance if
> this is a dumb question:  Does this differ from using a .map on an .iota when
> generating a parameter to an rtl s-expr?
>
>     cheers,
>       DaveK
>
>   

If one knows the number of iterations in advance, yes, they're 
essentially equivalent.  do-count means less rtl, which can be useful, 
but that's it.
[As it turns out I need to be able to make the number of iterations an 
expression, and not just a constant.]