If overlay is a concern then just use
ORG *,2,1
to move the location counter to the next byte after the half-word
boundary.
Kind Regards
John R Dravnieks
From: Tony Thigpen <[email protected]>
To: [email protected]
Date: 23/08/2016 12:24
Subject: Re: Friday puzzle: CNOP 1,2
Sent by: IBM Mainframe Assembler List
<[email protected]>
Won't this possibly overlay the previous field if the ORG happens to
land on a half-word boundary?
Maybe a set of ORGs:
ORG *+1
ORG *,2,-1
Tony Thigpen
John Dravnieks wrote on 08/22/2016 10:16 PM:
> Why not use ORG to do this for you?
>
> ORG *,2,-1 take current position (*),
> align to 2 byte boundary (if required), and move back one byte
>
>
> Kind Regards
>
> John R Dravnieks
>
>
>
>
> From: "Ngan, Robert" <[email protected]>
> To: [email protected]
> Date: 23/08/2016 03:03
> Subject: Re: Friday puzzle: CNOP 1,2
> Sent by: IBM Mainframe Assembler List
> <[email protected]>
>
>
>
> I was trying to avoid generating an extra filler byte when one was not
> required.
>
> -----Original Message-----
> From: IBM Mainframe Assembler List [
mailto:[email protected]
> ] On Behalf Of Robin Vowels
> Sent: Friday, August 19, 2016 20:18
> To: [email protected]
> Subject: Re: Friday puzzle: CNOP 1,2
>
> From: "Ngan, Robert" <[email protected]>
> Sent: Saturday, August 20, 2016 4:47 AM
>
>
> I'm writing a macro to build length prefixed character strings. The
> length is one byte, and the actual string is referenced by LARL so it
> needs to be halfword aligned.
> So I coded (what would be a CNOP 1,2 - if it was valid):
>
> DC (1-(*-&SYSECT)/2)X'00' Simulate a CNOP 1,2
>
> However, this generates ASMA067S Illegal duplication factor.
>
>
> what's wrong with DS 0H followed by DC X'00' or some such?
>
>
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