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get rid of problematic rewrite of certain for loops that were causing the end expression to be evaluated every loop iteration

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Irmen de Jong 2024-02-20 21:03:21 +01:00
parent aba36f7c92
commit b27368175d
2 changed files with 0 additions and 46 deletions
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44
codeOptimizers/src/prog8/optimizer/StatementOptimizer.kt
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@ -9,7 +9,6 @@ import prog8.code.core.AssociativeOperators
import prog8.code.core.CompilationOptions
import prog8.code.core.DataType
import prog8.code.core.IErrorReporter
import prog8.code.target.VMTarget
class StatementOptimizer(private val program: Program,
@ -195,49 +194,6 @@ class StatementOptimizer(private val program: Program,
return Assignment(AssignTarget(loopVar.copy(), null, null, pos), addSubOne, AssignmentOrigin.USERCODE, pos)
}
if (range != null && range.from.constValue(program)?.number == 0.0 && range.step.constValue(program)?.number==1.0) {
val toBinExpr = range.to as? BinaryExpression
if(toBinExpr!=null && toBinExpr.operator=="-" && toBinExpr.right.constValue(program)?.number==1.0) {
// FOR var IN 0 TO X-1 .... ---> var=0, DO {... , var++} UNTIL var==X
val pos = forLoop.position
val condition = BinaryExpression(forLoop.loopVar.copy(), "==", toBinExpr.left, pos)
val incOne = incOrDec(true)
forLoop.body.statements.add(incOne)
val replacement = AnonymousScope(mutableListOf(
Assignment(AssignTarget(forLoop.loopVar.copy(), null, null, pos),
NumericLiteral.optimalNumeric(0.0, pos),
AssignmentOrigin.OPTIMIZER, pos),
UntilLoop(forLoop.body, condition, pos)
), pos)
return listOf(IAstModification.ReplaceNode(forLoop, replacement, parent))
}
if(options.compTarget.name!=VMTarget.NAME) {
// this optimization is not effective for the VM target.
val toConst = range.to.constValue(program)
if (toConst == null) {
// FOR var in 0 TO X ... ---> var=0, REPEAT { ... , IF var==X break , var++ }
val pos = forLoop.position
val incOne = incOrDec(true)
val breakCondition = IfElse(
BinaryExpression(forLoop.loopVar, "==", range.to, pos),
AnonymousScope(mutableListOf(Break(pos)), pos),
AnonymousScope(mutableListOf(), pos),
pos
)
forLoop.body.statements.add(breakCondition)
forLoop.body.statements.add(incOne)
val replacement = AnonymousScope(mutableListOf(
Assignment(AssignTarget(forLoop.loopVar.copy(), null, null, pos),
NumericLiteral.optimalNumeric(0.0, pos),
AssignmentOrigin.OPTIMIZER, pos),
RepeatLoop(null, forLoop.body, pos)
), pos)
return listOf(IAstModification.ReplaceNode(forLoop, replacement, parent))
}
}
}
if (range != null && range.to.constValue(program)?.number == 0.0 && range.step.constValue(program)?.number==-1.0) {
val fromExpr = range.from
if(fromExpr.constValue(program)==null) {

2
docs/source/todo.rst
View File

@ -1,8 +1,6 @@
TODO
====
(after merge in boolean): move all "OperatorXinplace" from expressionGen to AssignmentGen, see if we can get rid of the Result return type.
replace Takes by Http4k in httpCompilerService project. https://github.com/http4k/examples/blob/master/hello-world/README.md
...