> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Phil Payne > Sent: Monday, January 28, 2008 5:43 AM > To: [email protected] > Subject: New Opcodes > > > New opcodes aren't something I worry too much about - I > managed to solve quite a few business > problems with System/360. > > Now old opcodes - I hope they all stick around. > > The terminology used in the PDF file is interesting: "50+ > instructions added to improve > compiled code efficiency". It almost sounds like these will > be unpublished instructions foro > use exclusively by IBM's compilers.
I hope not. I really __despise__ undocumented instructions. I don't know why, but I do. I guess because I find computer architecture interesting. But I don't see how a compiler can use an undocumented instruction. How would I debug the program if the instruction gets an exception of some sort? Or do source level, interactive, debugging at the assembler level? And, if they are reserved for IBM only compilers, that is anti competative. And what about GCC on Linux? I guess it would not be able to use the instructions. Undocumented, problem state, instructions are __EVIL__ as far as I am concerned. Yes, you've finally found something that I am a bit passionate about <grin>. > > Down at metal level it's quite a different architecture. I > wouldn't be surprised to see some > object code optimized a little with special instructions. > > -- > Phil Payne -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- 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
