Re: [cc65] Optimization ideas

--- Ullrich von Bassewitz <uz@musoftware.de> wrote:
> On Thu, Jun 21, 2007 at 05:39:22PM -0700, Dan wrote:
> > What causes this, by the
> > way? I know that register saving may be
> interleaved
> > with initialization, but why wouldn't the
> registers
> > always be allocated starting at 0?
> 
> Because they may be allocated in more than one chunk
> depending on the
> declaration.

But why would the allocation be non-contiguous? There
aren't any alignment restrictions, are there?

> > There are a couple ways to do it. You could make
> two
> > passes through the function source code (only when
> > needed), or you could do it at the assembly level.
> The
> > two pass method is probably much easier.
> 
> Thanks. I'm still waiting that somebody sends me a
> "small patch" that makes a
> two pass compiler with intermediate representation
> out of cc65 :-)

Making cc65 a two-pass compiler _without_ intermediate
representation should be easy.

Pass 1:
Compile and remember some stuff. Suppress output.
Pass 2:
Compile again. Use the data remembered in pass 1.

Same way a two-pass assembler works. Very simple.

Dan



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