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That being said: The optimizer yes normally builds push / pop a where it is necessary because, at OnSystick he does not. Maybe still a way to improve.
). Systick is special. It handles things like tasks and processes etc., and as such has an IJMP which makes it impossible for me to trace registers. Indeed I cannot trace registers in any routine that contains IJMP, EIJMP, ICALL or EICALL.
