> The 64 bit picolisp uses the "C control stack" to call functions.
I would rather call it the "hardware stack".
> Isn't the call usually like the following?
> call (C) # Eval SUBR
Yes, but these are in fact only two special places (in "src64/apply.l").
The typical cases (and most often executed) are conditional jumps in
"src64/main.l", in the form of 'jnz (A)'.
> Is the call in the form:
> jmp (A) # Eval SUBR
> "just" an optimization for tail calls?
Yes, though I would not use the word "tail" here. Such calls can happen
anywhere in a function. A sequence of 'call' and 'ret' can always be
replaced with a 'jmp'.
The above typical case of
would otherwise need to be