Apple-2-SW/prog8
1
0
Fork 0
mirror of https://github.com/irmen/prog8.git synced 2025-07-25 11:24:15 +00:00
Code Issues Projects Releases Wiki Activity

added more constfolding

Browse Source
This commit is contained in:
Irmen de Jong
2021-12-09 23:32:48 +01:00
parent abca618008
commit 3d743a1ba1
4 changed files with 41 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
codeOptimizers/src/prog8/optimizer/ConstantFoldingOptimizer.kt
View File

@@ -212,21 +212,27 @@ class ConstantFoldingOptimizer(private val program: Program) : AstWalker() {
}
}
}
else if(expr.operator=="*" && leftBinExpr.operator=="*") {
else if(expr.operator=="*") {
val c2 = leftBinExpr.right.constValue(program)
if(c2!=null) {
// (X * C1) * C2 --> X * (C1*C2)
// TODO (X * C1) / C2 --> X * (C1/C2)
val constants = BinaryExpression(c2, "*", rightconst, c2.position)
val newExpr = BinaryExpression(leftBinExpr.left, "*", constants, expr.position)
return listOf(IAstModification.ReplaceNode(expr, newExpr, parent))
if(leftBinExpr.operator=="*") {
// (X * C2) * rightConst --> X * (rightConst*C2)
val constants = BinaryExpression(rightconst, "*", c2, c2.position)
val newExpr = BinaryExpression(leftBinExpr.left, "*", constants, expr.position)
return listOf(IAstModification.ReplaceNode(expr, newExpr, parent))
} else if (leftBinExpr.operator=="/") {
// (X / C2) * rightConst --> X * (rightConst/C2)
val constants = BinaryExpression(rightconst, "/", c2, c2.position)
val newExpr = BinaryExpression(leftBinExpr.left, "*", constants, expr.position)
return listOf(IAstModification.ReplaceNode(expr, newExpr, parent))
}
}
}
else if(expr.operator=="/" && leftBinExpr.operator=="/") {
else if(expr.operator=="/") {
val c2 = leftBinExpr.right.constValue(program)
if(c2!=null) {
if(c2!=null && leftBinExpr.operator=="/") {
// (X / C1) / C2 --> X / (C1*C2)
// TODO (X / C1) * C2 --> X * (C2/C1)
// NOTE: do not optimize (X * C1) / C2 --> X * (C1/C2) because this causes precision loss on integers
val constants = BinaryExpression(c2, "*", rightconst, c2.position)
val newExpr = BinaryExpression(leftBinExpr.left, "/", constants, expr.position)
return listOf(IAstModification.ReplaceNode(expr, newExpr, parent))