On Sat, 1 Mar 2008 11:00:43 -0800, Edward Jaffe wrote: > >Give 'em an inch and they'll take a yard! People are already clamoring >for additional forms of EXRL that can "OR" the mask with other than byte >one of the target instruction! It never ends! :-) > Why not just a facility that will OR an entire grande register with 8 bytes of instructions and execute the result? If one wished, one might put zeroes in the storage and the instruction proper in the register.
This comes perilously close to self-modifying code. I'm reminded of the PDP-6/10/20, where the registers were memory mapped, or the bottom 16 words of memory were register mapped, depending on model/feature/price. One could MVC (of course; no need for LM) a short loop into registers and branch to location 0 to execute it. -- gil ---------------------------------------------------------------------- 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
