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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Adapting an Ada compiler to generate 8051 code (Again?! ;-)
Date: Wed, 31 Mar 2021 18:20:51 -0500
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"Luke A. Guest" <laguest@archeia.com> wrote in message 
news:s40urd$qbp$1@gioia.aioe.org...
...
> AVR isn't really an accumulator arch, it's got 32 registers. Even the 6502 
> has a port, but that uses the zero page as virtual registers. The Z80 
> cannot do that as it starts executing from address 0 iirc.

The Z-80 has enough registers for Ada (or at least a reasonable subtest) --  
see the original Janus/Ada compilers. If you want *real* registers, even the 
x86 doesn't have enough registers for reasonable code optimizations. A 
"register architecture" is an iffy model for an intermediate language if you 
ask me.

                      Randy.