Conversation

Believe it or not I had sort of prepared a neat little tootstorm on OoO and speculative execution when I realised that what is really needed is an analysis on what tradeoffs were chosen as opposed to yet another OoO description.

What seems to be missing from everything I have read are two points:

a) speculative execution and OoO go back a long time (IBM S/360 model 85),
b) they are essential for performance: you simply cannot get “the numbers” otherwise.

Some of you might be old enough to…