Cortex-A7 pipeline is non-symmetric, what does this attribute mean?
My understand is that cortex-A7 pipeline's five entries does not have the same two, in the contrary, the cortex-A15 have the two entries are the same.
The second slot of the dual issue in the A7 could mainly only do integer instructions whereas for the newer A53 it can do most of the things the first slot can do. Symmetric in general means interchangeable and the issue slots of the A7 are nowhere near equivalent whereas those for the A53 are nearly so.