Just a point coming to mind here:
When you call the ISR from the vector you use two more stack slots than you would use if you jumped.
With the interrupts always on the top of the stack, this difference can be important.
I can visualize a blow when 4 interrupts stack up (in a modern derivative with 4 priorities) blowing the stack for this very reason. This will probably occur less than once a month, the confluence will be that rare. Such problems are SO MUCH FUN.

Erik

Erik

Erik