[Help-smalltalk] Re: [Lightning] Argument Management

[Paolo Bonzini]

> I don't think we're on the same page. I don't mean another code
> generation macro, I meant a simple flag, so that my code generation
> routines can switch between a custom calling convention, and the
> standard prolog.
>
> void codegen() {
>   if (JIT_NEEDS_PROLOG) {
>     jit_prolog(n);
>     ...
>   } else {
>     //custom cc
>     ...
>   }
> }
>
> The switch will likely be #ifdef'd, but that's the idea. I don't see
> how jit_leaf helps me here. It' sufficient to define:

If jit_leaf worked, you could have used

  jit_leaf (0);

instead.

> >  > I've considered CPS, particularly in conjunction with the Cheney on
> >  > the MTA-style GC. Unfortunately, CPS just kills the pipeline due to
> >  > the indirect function calls. Given how deep pipelines are nowadays,
> >  > and the fact that they're getting deeper, I'm reluctant to go this
> >  > way.
> >
> >  Do you have so many function calls?

... so many as to make the slowdown from indirect function calls sensible?

Paolo