On Tue, 26 Feb 2013 13:02:22 -0600, Tom Marchant <[email protected]> 
wrote:

>On Tue, 26 Feb 2013 12:46:13 -0600, Bill Godfrey wrote:
>
>>         N     R15,=A(X'FFFFFFF0')
>
>This is a case where my preference would be to use a newer instruction.
>
>        NILL  R15,X'FFF0'
>
>It is part of the Relative-and-Immediate facility that was required for OS/390 
>2.10.
>
Agreed. I can code the "N" instruction without having to look it up. I knew 
there was something better like NILL but didn't bother to look it up.

Bill

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