Re: [oc] PUSH/POP Instructions on RISC?

["Marko Mlinar" <markom@opencores.org>]

> > > Why are the push/pop instructions never found on risc processors? If a
> > > processor has two write backs to the register file it doesn't need
that
> > OR1k doesn't have two write ports...
> Well it's easy to add especially since the regfile is often a dual
> ported ram.
yes, but often this dual port means you have 1 R and 1 W port or 2 R/W
ports.
In case of OR1k, you need 2R and 1W ports, for which 2 dual port memories of
any type
can be used.
Your solution would require 2R and 2W ports, making thing much more complex.

Marko



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