Unless the new version truly needs to move more than 16M bytes at a time, I would stay with MVCL. The only two benefits to using MVCLE are support for 4GB lengths (32 bits instead of 24 bits) and the padding byte specified as part of the instruction instead of loaded in to the high byte of a register.
I suspect that "CPU-determined" number of bytes probably is not documented. If IBM still published "Functional Specifications" manuals for each CPU model it would probably be there, but they don't publish those any more. HTH Peter -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Brite Sent: Tuesday, May 05, 2015 3:33 PM To: [email protected] Subject: Re: LNKEDT 64-bit mode assembler in AMODE 31 Another change I noticed is MVCL is replaced with loop of MVCLE. According to PoO, MVCLE will stop every CPU-determined number of bytes. Where to look for this number? This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system.
