Yes, I do believe you are correct. Checked a bit of old code for clearing an area and both source addr and length are 0
Regards, Gary Freestone -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Charles Mills Sent: Thursday, 17 August 2017 11:01 PM To: [email protected] Subject: Source address significance for clearing MVCL 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? Thanks, Charles Mills
