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Re: optimising recursive functions


On 10/27/07, Robert Dewar <dewar@adacore.com> wrote:
> skaller wrote:
>
> > So I am guessing the Felix version is lucky there are
> > no gratuitous temporaries to be saved when this happens,
> > and the C code is unlucky and there are.
> >
> > Maybe someone who knows how the optimiser works can comment?
>
> One problem with departing from the ABI even on a local level
> like this is that it wipes out lots of tools that depend on
> ABI compliance for the entire call chain. I suspect the overall
> gain is too small to be worth this hit.

If you make the function static then gcc can chose ABI-incompatible
calling conventions.

Richard.


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