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about bool

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This commit is contained in:
Irmen de Jong 2022-07-03 14:44:04 +02:00
parent fee58e98c5
commit beea6bc794
2 changed files with 21 additions and 12 deletions
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11
codeGenVirtual/src/prog8/codegen/virtual/VmPeepholeOptimizer.kt
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@ -41,12 +41,13 @@ internal class VmPeepholeOptimizer(private val vmprog: AssemblyProgram, private
var changed = false
indexedInstructions.forEach { (idx, ins) ->
// TODO: detect multiple loads to the same target, only keep first
// TODO: detect multiple stores to the same target, only keep first
// TODO: detect multiple ffrom/fto to the same target, only keep first
// TODO: detect multiple loads to the same target registers, only keep first (if source is not I/O memory)
// TODO: detect multiple stores to the same target, only keep first (if target is not I/O memory)
// TODO: detect multiple float ffrom/fto to the same target, only keep first
// TODO: detect multiple sequential rnd with same reg1, only keep one
// TODO: double same xors/nots/negs, remove the pair completely as they cancel out
// TODO: multiple same ands, ors, only keep first
// TODO: detect subsequent same xors/nots/negs, remove the pairs completely as they cancel out
// TODO: detect multiple same ands, ors; only keep first
// ...
}
return changed
}

22
docs/source/todo.rst
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@ -3,7 +3,7 @@ TODO
For next release
^^^^^^^^^^^^^^^^
- bool data type? see below
...
Need help with
@ -16,6 +16,8 @@ Need help with
Future Things and Ideas
^^^^^^^^^^^^^^^^^^^^^^^
Compiler:
- bool data type? see below
- add some more optimizations in vmPeepholeOptimizer
- vm Instruction needs to know what the read-registers/memory are, and what the write-register/memory is.
this info is needed for more advanced optimizations and later code generation steps.
@ -71,7 +73,7 @@ Expressions:
Optimizations:
- various optimizers skip stuff if compTarget.name==VMTarget.NAME. Once (if?) 6502-codegen is no longer done from
- 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
- AssignmentAsmGen.assignExpression() -> improve code gen for assigning boolean comparison expressions
@ -87,12 +89,18 @@ because the type of boolean values is UBYTE (so theoretically the value can be a
So the idea is to add a true 'bool' type
- add BOOL datatype
- add BOOL datatype to enumeration
- optional (lot of work):
- add BooleanLiteral ast node to hold true and false, of type BOOL
- make 'true' and 'false' parse into BooleanLiterals
- make sure everything works again (all places using NumericLiteral also have to consider BooleanLiteral...)
- idea: let BooleanLiteral subclass from NumericLiteral ?
- add 'bool' type to grammar and parser
- remove builtin function boolean() replace with typecast to BOOL
- add ARRAY_OF_BOOL array type
- assignments to it automatically do boolean() conversion
- logical expressions don't wrap operand of this type
- bool & 1 -> bool
- before codegen, bool type is discarded and it's just UBYTE
- logical expressions don't cast operands of BOOL type to BOOL anymore...
- boolvar & 1 -> boolvar
- before codegen, BOOL type is simply discarded and replaced by UBYTE
STRUCTS again?