prog8/docs/source/todo.rst

====
TODO
====

Memory Block Operations integrated in language?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

list,string memory block operations?

- list operations (whole list, individual element)
  operations: set, get, copy (from another list with the same length), shift-N(left,right), rotate-N(left,right)
  clear (set whole list to the given value, default 0)

- list operations ofcourse work identical on vars and on memory mapped vars of these types.

- strings: identical operations as on lists.

these should call optimized pieces of assembly code, so they run as fast as possible

For now, we have the ``memcopy``, ``memset`` and ``strlen`` builtin functions.

Fixes
^^^^^

fix asmsub parameters so this works::

      asmsub aa(byte arg @ Y) -> clobbers() -> () {
          byte local = arg      ; @todo fix 'undefined symbol arg' that occurs here
          A=44
      }


More optimizations
^^^^^^^^^^^^^^^^^^

Add more compiler optimizations to the existing ones.

- on the language AST level
- on the final assembly source level
- can the parameter passing to subroutines be optimized to avoid copying?

- subroutines with 1 or 2 byte args (or 1 word arg) should be converted to asm calling convention with the args in A/Y register
  this requires rethinking the way parameters are represented, simply injecting vardecls to
  declare local variables for them is not always correct anymore

- working subroutine inlining (taking care of vars and identifier refs to them)

Also some library routines and code patterns could perhaps be optimized further


Eval stack redesign? (lot of work)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The eval stack is now a split lsb/msb stack using X as the stackpointer.
Is it easier/faster to just use a single page unsplit stack?
It could then even be moved into the zeropage to greatly reduce code size and slowness.

Or just move the LSB portion into a slab of the zeropage.

Allocate a fixed word in ZP that is the TOS so we can operate on TOS directly
without having to to index into the stack?


Misc
^^^^

- are there any other missing instructions in the code generator?