IBM stopped publishing instruction timings quite a while ago. With the advent of multiple stage processors and the inter-dependencies of the instructions, timings for single instructions became meaningless. Even for an XR or SLR a lot depends on what and when the register was used or will be used can affect what you are doing.
Put another way, individual instructions don't matter as much as they used to. The sequence of instructions is much more important. Chris Blaicher Principal Software Engineer, Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: [email protected] -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Robin Vowels Sent: Tuesday, June 03, 2014 9:52 AM To: MVS List Server 2 Subject: Re: Out of Order and Superscalar - small experiment From: "Tom Marchant" <[email protected]> Sent: Tuesday, June 03, 2014 10:17 PM > On Tue, 3 Jun 2014 20:01:24 +1000, Robin Vowels wrote: > >>And while I have the manual out, BCTR is from 40% to 70% faster than BCT. > > What manual are you looking at that has any relevance at all to the > instruction timing for modern processors? Do you have something better? --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com
