Assemble it with TYPECHECK(REGISTER) and see what happens.

-- 
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
עַם יִשְׂרָאֵל חַי
נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר




________________________________________
From: IBM Mainframe Assembler List <[email protected]> on behalf 
of Rupert Reynolds <[email protected]>
Sent: Wednesday, September 3, 2025 3:04 PM
To: [email protected] <[email protected]>
Subject: Re: Using (0) to suppress alignment checks in HLASM


External Message: Use Caution


It's been a while, but to me assigning an assembly type of GR won't change
the code.

I reckon all 3 will assemble like
         LA    0,5(0,0)

Roops
---
"Mundus sine Caesaribus"

On Wed, 3 Sept 2025, 18:29 Seymour J Metz, <[email protected]> wrote:

> What would you expect when you assembled this, assuming I counted commas
> correctly?
>
> R0       EQU   0
> GR0    EQU   0,,,,GR
>          LA    0,5
>          LA    R0,5
>          LA    GR0,5
>
>
> --
>


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