> On Jul 27, 2023, at 7:50 AM, Maciej W. Rozycki <ma...@orcam.me.uk> wrote:
>
> On Fri, 14 Jul 2023, Vladimir Makarov via Gcc wrote:
>
>>> On the avr, the stack pointer (SP)
>>> is not used to access stack slots
>> It is very uncommon target then.
>
> Same with the VAX target. SP is used for outgoing function arguments,
> function calls, alloca only. AP is used for incoming function arguments
> and is set automatically by hardware at function entry. FP is used for
> local variables and is likewise set by hardware at function entry.
While most other targets maintain FP in software, doesn't the same description
apply to any target that can have a frame pointer. The frame pointer may be
used only some of the time (PDP-11) or always (VAX) but when it's used local
variable references and argument references would go through FP, not SP, right?
paul
