Question: The standard calling sequence for the c. 1980 Digital VAX instruction set employed not only a stack pointer (sp) and frame pointer (fp), but a

The standard calling sequence for the c. 1980 Digital VAX instruction set employed not only a stack pointer (sp) and frame pointer (fp), but a separate arguments pointer (ap) as well. Under what circumstances might this separate pointer be useful? In other words, when might it be handy not to have to place arguments at statically known offsets from the fp?

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