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@mothcompute Apparently so; I was thinking that 'store forwarding' would be the thing that lets this happen; but when I was hunting for a reference (e.g. see 24.17 below); I came across 'Mirroring memory operands' 24.17/page 236 which says 'It also works with PUSH and POP instructions.'. Note, I doubt Microcode gets involved - I think microcode only happens for big complex stuff, not anything fast.

https://www.agner.org/optimize/microarchitecture.pdf