Comment by flohofwoe
7 months ago
These are mostly internal implementation details, instructions still appear to resolve in order from the outside (with some subtle exceptions for memory read/writes depending on the CPU architecture). It may become important to know such details for performance profiling though.
What has drastically changed is that you cannot do trivial 'cycle counting' anymore.
Not to step on your toes, but it shall be said that instructions in a CPU "retire" in order.
They don't even always do that anymore.
Depends what you mean by "retire" but by the normal definition they always retire in order, even in OoO CPUs. You might be thinking of writeback.