Perfect! Thanks, Charles
-----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Jonathan Scott Sent: Thursday, August 17, 2017 10:15 AM To: [email protected] Subject: Re: Source address significance for clearing MVCL Ref: Your note of 17 August 2017, 09:00:52 EDT It is there in the book (SA22-7832-09, second sentence in the last paragraph before the Resulting Condition Code heading): When the length of an operand is zero, no access exceptions for that operand are recognized. Charles Mills wrote: > I don't see this explicitly in the PoOp. Is my recollection correct? > That for a "pure clearing" MVCL (source length zero, destination > length non-zero) the contents of source address register R2 are not > significant, and a specification or access exception on the source address is not possible? Jonathan Scott HLASM IBM UK Labs, Hursley
