This drifted into a discussion of manual links. Did anyone address > Has anyone done benchmarks on different scenarios with instructions with immediate & relative instructions versus the old instructions
My personal opinion are 1. I doubt that the differences are significant unless you are calculating pi to 1000 digits or implementing your own 8192-bit encryption. 2. The relative instructions are SO convenient relative (sorry) to the old base/displacement instructions that I wonder how we ever lived without them. 3. Even if they are a little slower, it would not take very many eliminated "save and load another base register" scenarios to make up for it. 4. Because of pipelining, caching and so forth it is difficult to construct benchmarks that are going to accurately reflect your real-world situation. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Richard Verville Sent: Tuesday, July 09, 2013 12:30 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Benchmark of Relative instructions vers Base+displacement ones Has anyone done benchmarks on different scenarios with instructions with immediate & relative instructions versus the old instructions. I have to rewrite some code for CICS on zOS & VSE and I wonder if it's worth it. Also I can't find a Load Fullword Immediate instruction (like LHI) where the intent is to ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
