He was talking 1 mvi for the first character of the tag, then one MVC
for the following characters. Not multiple MVIs.
MVI MYTAG,C'A'
MVC MYTAG+1(3),=C'BCD'
Tony Thigpen
Keven Hall wrote on 10/24/20 6:00 PM:
Would not L/ST be faster than 4-MVIs? Most every control-block I’ve seen
bearing an eye-catcher is Fullword aligned in storage which makes for optimal
execution.
Keven
On Oct 24, 2020, at 16:57, Tony Thigpen <[email protected]> wrote:
I was thinking that the MVI would be some sort of special character, limiting
the tag to just 3 unique characters. But now I understand it better. My mistake.
Tony Thigpen
Charles Mills wrote on 10/24/20 5:23 PM:
Why not? What's wrong with MVI/MVC for 3?
Given that it would involve no storage references beyond the target and
i-cache, I wonder if the fastest way to set four bytes, without the string
appearing in storage, might not be four sequential MVI's.
Charles
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]]
On Behalf Of Tony Thigpen
Sent: Saturday, October 24, 2020 2:07 PM
To: [email protected]
Subject: Re: Reversed string macro
I kinda like the concept, but a lot of literals we use are just 4
characters, so it does not scale down easily.
