John Ehrman wrote:
>Performance concerns about individual instructions aren't worth much
>effort. Things like operand alignment, data and instruction cache
>retention, locality of reference, branch frequency etc. can have really
>significant effects.
For sure. But for the pathologically curious, if you have z/VM source, look
at the main module for EXEC 2 (DMSEXE). It's full of lines like:
SLR R0,R8 (DO IT WHILE R3 SETTLES)
These must go back to what, 303x? 370 itself? Christopher J. Stephenson Sir
Chris the EXECutor) wrote this code 30+ years ago, when that stuff DID
matter.
There were giants in those days...!
...phsiii
