On Mon, 12 Aug 2019 20:48:18 -0400, Brian Chapman <[email protected]> wrote:
>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? > There used to be, with every new IBM System/360 machine, a "Functional Characteristics" publication stating "Instruction Times" in microseconds. Here is one for the IBM System/360 Model 85: http://www.bitsavers.org/pdf/ibm/360/funcChar/A22-6916-1_360-85_funcChar_Jun68.pdf See page 27. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
