I think, it is easier to try it, than to discuss an endless time, which code line may have an influence or not.

On my practice I detected more side effects on using "using" and less side effects without it.

And if not all 8 registers are needed, then it waste more memory, because the compiler allocate always all 8 registers as used.
But on the default register bank only the used registers are pushed.

So removing "using" may also solve a stack overflow problem.


Peter