In a recent note, Greg Smith said: > Date: Wed, 6 Jul 2005 12:26:01 -0400 > > ds 0d > a ds 12x > b ds 16x > But if I code > > mvc b(16),a > > the overlap is destructive (ie b won't necessarily be an exact copy of > a). Would a > concurrent copy occur? (in this case, a concurrent copy could occur > without affecting > the result). > No. I believe the "destructive" character of the overlap has long been part of the specification of MVC. In particular, programmers of old were accustomed to blanking out a buffer with:
MVI C' ',A MVC A+1(L'A'-1),A (before padding MVCL). -- gil -- StorageTek INFORMATION made POWERFUL ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html