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unsigned>0 now optimized into unsigned!=0

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This commit is contained in:
Irmen de Jong 2022-12-12 20:37:57 +01:00
parent 832601b36b
commit 0694a187d7
2 changed files with 13 additions and 4 deletions
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16
codeOptimizers/src/prog8/optimizer/ExpressionSimplifier.kt
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@ -193,11 +193,15 @@ class ExpressionSimplifier(private val program: Program,
return listOf(IAstModification.ReplaceNode(expr.right, NumericLiteral.optimalInteger(0, expr.right.position), expr))
}
if(expr.operator == ">=" && rightVal?.number == 0.0) {
if (leftDt == DataType.UBYTE || leftDt == DataType.UWORD) {
if (leftDt == DataType.UBYTE || leftDt == DataType.UWORD) {
if(expr.operator == ">=" && rightVal?.number == 0.0) {
// unsigned >= 0 --> true
return listOf(IAstModification.ReplaceNode(expr, NumericLiteral.fromBoolean(true, expr.position), parent))
}
else if(expr.operator == ">" && rightVal?.number == 0.0) {
// unsigned > 0 --> unsigned != 0
return listOf(IAstModification.SetExpression({expr.operator="!="}, expr, parent))
}
}
if(leftDt!=DataType.FLOAT && expr.operator == "<" && rightVal?.number == 1.0) {
@ -206,11 +210,15 @@ class ExpressionSimplifier(private val program: Program,
return listOf(IAstModification.ReplaceNode(expr.right, NumericLiteral.optimalInteger(0, expr.right.position), expr))
}
if(expr.operator == "<" && rightVal?.number == 0.0) {
if (leftDt == DataType.UBYTE || leftDt == DataType.UWORD) {
if (leftDt == DataType.UBYTE || leftDt == DataType.UWORD) {
if(expr.operator == "<" && rightVal?.number == 0.0) {
// unsigned < 0 --> false
return listOf(IAstModification.ReplaceNode(expr, NumericLiteral.fromBoolean(false, expr.position), parent))
}
else if(expr.operator == "<=" && rightVal?.number == 0.0) {
// unsigned <= 0 --> unsigned==0
return listOf(IAstModification.SetExpression({expr.operator="=="}, expr, parent))
}
}
// boolvar & 1 --> boolvar

1
docs/source/todo.rst
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@ -3,6 +3,7 @@ TODO
For next release
^^^^^^^^^^^^^^^^
- "until not bytearray[index]" creates some pretty silly assembly code. what about while? if?
- regression test the various projects before release
...