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todo

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Irmen de Jong 2023-02-16 22:53:16 +01:00
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@ -3,10 +3,20 @@ TODO
For next minor release
^^^^^^^^^^^^^^^^^^^^^^
- 6502 codegen optimize array1[index] += / -= array2[index] to not use slow stackeval (attemptAssignOptimizedBinexpr)
- various optimizers skip stuff if compTarget.name==VMTarget.NAME. When 6502-codegen is no longer done from
the old CompilerAst, those checks should probably be removed, or be made permanent
- 6502 codegen: create BSS section in output assembly code and put StStaticVariables in there with bss=true.
Don't forget to add init code to zero out everything that was put in bss. If array in bss->only zero ONCE if possible.
Note that bss can still contain variables that have @zp tag and those are already dealt with differently
- bss: subroutine parameters don't have to be set to 0.
...
For 9.0 major changes
^^^^^^^^^^^^^^^^^^^^^
- duplicate diskio for cx16 (get rid of cx16diskio, just copy diskio and tweak everything) + documentation
- get f_seek_w working like in the BASIC program - this needs the changes to diskio.f_open to use suffixes ,p,m
- SEGMENTS.
- Add a mechanism to allocate variables into golden ram (or segments really) (see GoldenRam class)
- block "golden" treated specially: every var in here will be allocated in the Golden ram area
@ -29,10 +39,6 @@ Future Things and Ideas
^^^^^^^^^^^^^^^^^^^^^^^
Compiler:
- 6502 codegen: create BSS section in output assembly code and put StStaticVariables in there with bss=true.
Don't forget to add init code to zero out everything that was put in bss. If array in bss->only zero ONCE if possible.
Note that bss can still contain variables that have @zp tag and those are already dealt with differently
- bss: subroutine parameters don't have to be set to 0.
- ir: mechanism to determine for chunks which registers are getting input values from "outside"
- ir: mechanism to determine for chunks which registers are passing values out? (i.e. are used again in another chunk)
- ir: peephole opt: renumber registers in chunks to start with 1 again every time (but keep entry values in mind!)
@ -44,8 +50,6 @@ Compiler:
It is documented behavior to now loop 'around' $00 but it's too easy to forget about!
Lot of work because of so many special cases in ForLoopsAsmgen..... (vm codegen already behaves like this)
- ir: can we determine for the loop variable in forloops if it could be kept in a (virtual) register instead of a real variable? Need to be able to check if the variable is used by another statement beside just the for loop.
- createAssemblyAndAssemble(): make it possible to actually get rid of the VarDecl nodes by fixing the rest of the code mentioned there.
but probably better to rewrite the 6502 codegen on top of the new Ast.
- generate WASM to eventually run prog8 on a browser canvas?
- [problematic due to using 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 with a compiler flag?
@ -57,8 +61,6 @@ Compiler:
Libraries:
- duplicate diskio for cx16 (get rid of cx16diskio, just copy diskio and tweak everything) + documentation
- get f_seek_w working like in the BASIC program - this needs the changes to diskio.f_open to use suffixes ,p,m
- fix the problems in c128 target, and flesh out its libraries.
- fix the problems in atari target, and flesh out its libraries.
- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
@ -78,13 +80,10 @@ Expressions:
Optimizations:
- various optimizers skip stuff if compTarget.name==VMTarget.NAME. When 6502-codegen is no longer done from
the old CompilerAst, those checks should probably be removed, or be made permanent
- VariableAllocator: can we think of a smarter strategy for allocating variables into zeropage, rather than first-come-first-served?
- when a loopvariable of a forloop isn't referenced in the body, and the iterations are known, replace the loop by a repeatloop
but we have no efficient way right now to see if the body references a variable.
- optimize function argument expressions better (use temporary variables to replace non-simple expressions?)
- 6502 codegen optimize array1[index] += / -= array2[index] to not use slow stackeval (attemptAssignOptimizedBinexpr)
STRUCTS again?