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From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: is Vax addressing sane today
Date: Tue, 24 Sep 2024 17:57:51 +0000
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On Tue, 24 Sep 2024 17:06:27 +0000, Stephen Fuld wrote:

> On 9/23/2024 11:02 PM, Terje Mathisen wrote:
>
> snip
>
>> Maybe all add/sub/etc opcodes that are immediately followed by an INTO
>> could be fused into a single ADDO/SUBO/etc version that takes zero extra
>> cycles as long as the trap part isn't hit?
>
> If you are going to do that, why not make it an optional prefix byte?
> That way, no fusion needed, no extra cycles, yet the same amount of code
> space.

Realistically, what is the difference if INTO is a prefix
byte or a postfix byte ?