If you are interested in how these things work under the covers (regardless
of whether it is possible or useful to minutely optimize your code these
days), you might check out any of the several presentations done at SHARE
and other places by Bob Rogers, now retired from IBM, under titles like
"How do you do what you do when you're an xxx CPU". The only one I can find
right now is for the z13, and it concentrates on the then-new SIMD
implementation, but nonetheless has a bunch on more general pipelining and
out of order execution.
https://share.confex.com/share/125/webprogram/Handout/Session17797/How%20do%20you%20do%20what%20you%20do%20when%20youre%20a%20z13%20CPU.pdf

Tony H.

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