A GREAT introduction to this topic, by someone who unlike me actually knows 
what he is talking about:

https://linuxmain.blogspot.com/2017/02/zoptimizationprimer.html 

Charles


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Brian Chapman
Sent: Monday, August 12, 2019 5:48 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Instruction speeds

Hi everyone,

I did some searching, but I didn't find anything that really discussed this
on the topic that I'm interested. Is there anything published that compares
the cycle times of the most used instructions?

For example; moving an address between areas of storage. I would assume
that executing a LOAD and STORE would be much quicker than executing a MVC.

Or executing a LOAD ADDRESS to increment a register instead of ADD HALF
WORD.

Or does this really matter as much as ordering the instructions so they are
optimized for the pipeline?

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