TODO
====

For next compiler release (7.6)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...

Need help with
^^^^^^^^^^^^^^
- c128 target: various machine specific things (free zp locations, how banking works, getting the floating point routines working, ...)
- other targets such as Atari 800XL: all required details about the machine, I have no clue whatsoever


Blocked by an official Commander-x16 r39 release
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- simplify cx16.joystick_get2() once this cx16 rom issue is resolved: https://github.com/commanderx16/x16-rom/issues/203
  (I hope this will be included into the r39 roms when they get released)


Future
^^^^^^
- make some sort of "porting guide" with things required to support a new target platform
- make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``v_``
  then we can get rid of the instruction lists in the machinedefinitions as well?
- fix the asm-labels problem (github issue #62)
- simplifyConditionalExpression() should not split expression if it still results in stack-based evaluation
- simplifyConditionalExpression() sometimes introduces needless assignment to r9 tempvar
- get rid of all TODO's in the code
- improve testability further, add more tests
- use more of Result<> and Either<> to handle errors/ nulls better
- rethink the whole "isAugmentable" business.  Because the way this is determined, should always also be exactly mirrorred in the AugmentableAssignmentAsmGen or you'll get a crash at code gen time.
- can we get rid of pieces of asmgen.AssignmentAsmGen by just reusing the AugmentableAssignment ? generated code should not suffer
- add a switch to not create the globals-initialization logic, but instead create a smaller program (that can only run once though)
- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
- optimize several inner loops in gfx2 even further?
- add modes 2 and 3 to gfx2 (lowres 4 color and 16 color)?
- add a flood fill routine to gfx2?
- add a diskio.f_seek() routine for the Cx16 that uses its seek dos api?
- make it possible for diskio to read and write from more than one file at the same time (= use multiple io channels)?
- fix problems in c128 target
- [problematic due to 64tass:] add a compiler option to not remove unused subroutines. this allows for building library programs. But this won't work with 64tass's .proc ...
  Perhaps replace all uses of .proc/.pend by .block/.bend will fix that?
  (but we lose the optimizing aspect of the assembler where it strips out unused code.
  There's not really a dynamic switch possible as all assembly lib code is static and uses one or the other)


More code optimization ideas
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- automatically convert if statements that test for multiple values (if X==1 or X==2..) to if X in [1,2,..] statements, instead of just a warning
- byte typed expressions should be evaluated in the accumulator where possible, without (temp)var
   for instance  value = otherbyte >> 1   -->  lda otherbite ; lsr a; sta value
- rewrite expression tree evaluation such that it doesn't use an eval stack but flatten the tree into linear code that uses a fixed number of predetermined value 'variables'
- this removes the need for the BinExprSplitter? (which is problematic and very limited now)
- introduce byte-index operator to avoid index multiplications in loops over arrays? see github issue #4