Hi, Philipp!
When in the future the new calling convention is made the default in
> trunk, a way to indicate the use of the old calling convention (maybe
> __sdccoldcall or so) will be introduced to use the old calling
> convention for individual functions. Maybe __sdccoldcall, __stackcall or
> something like that.
>
It would be great if there was some macro definition indicating calling
convention at compile time.
In such case we could do something like that:
> void some_func()
> {
> __asm
> #ifdef __SDCC_STM8_CALL_LEGACY
> /*Legacy code*/
> #else /* __SDCC_STM8_CALL_LEGACY */
> /*Code for current calling convention*/
> #endif /* __SDCC_STM8_CALL_LEGACY */
> __endasm;
> }
Best regards,
Paul Beltyukov
вт, 29 июн. 2021 г. в 10:29, Philipp Klaus Krause <p...@spth.de>:
> Am 29.06.21 um 00:38 schrieb Basil Hussain:
> >
> > If you are adding these attribute keywords, would it then be possible to
> > have one to dictate, per function, the use of the old purely-stack-based
> > calling convention? I think this would be a good idea for the sake of
> > backwards compatibility, so that existing inline assembly code does not
> > have to be rewritten just to compile under the new version.
>
> When in the future the new calling convention is made the default in
> trunk, a way to indicate the use of the old calling convention (maybe
> __sdccoldcall or so) will be introduced to use the old calling
> convention for individual functions. Maybe __sdccoldcall, __stackcall or
> something like that.
>
> >> callee. In the current convention, the cleanup is always done by the
> >> caller. The caller vs callee-cleanup is the aspect that I am still a bit
> >> unsure of. While this makes a differnce, the pciture was not that clear
> >> initally.
> >
> > Can I clarify my understanding here? Callee-cleanup will have the called
> > function rewind the stack pointer for any arguments that were passed on
> > the stack. So, the caller will still push args onto the stack as before,
> > but the callee will be responsible for clearing them off the stack? And
> > the caller will not need to do anything after the called function
> > returns. Am I correct?
>
>
> Yes.
>
> >
> > I have a tangential question: does any of this work make it easier to
> > implement the callee-saves option/pragma for STM8?
>
> These are unrelated.
>
> Philipp
>
>
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