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From: Stephen Fuld <sfuld@alumni.cmu.edu.invalid>
Newsgroups: comp.arch
Subject: Re: is Vax addressing sane today
Date: Tue, 24 Sep 2024 10:06:27 -0700
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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.


-- 
  - Stephen Fuld
(e-mail address disguised to prevent spam)