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fixed: word << 12 is suddenly an uword (with optimizer on)

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Irmen de Jong 2022-11-15 03:00:41 +01:00
parent 836a2700f2
commit df1793efbf
2 changed files with 20 additions and 2 deletions
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21
codeOptimizers/src/prog8/optimizer/ExpressionSimplifier.kt
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@ -592,7 +592,7 @@ class ExpressionSimplifier(private val program: Program,
return NumericLiteral(targetDt, 0.0, expr.position)
}
}
DataType.UWORD, DataType.WORD -> {
DataType.UWORD -> {
if (amount >= 16) {
errors.warn("shift always results in 0", expr.position)
return NumericLiteral(targetDt, 0.0, expr.position)
@ -609,6 +609,25 @@ class ExpressionSimplifier(private val program: Program,
return FunctionCallExpression(IdentifierReference(listOf("mkword"), expr.position), mutableListOf(shifted, NumericLiteral.optimalInteger(0, expr.position)), expr.position)
}
}
DataType.WORD -> {
if (amount >= 16) {
errors.warn("shift always results in 0", expr.position)
return NumericLiteral(targetDt, 0.0, expr.position)
}
else if(amount==8) {
// shift left by 8 bits is just a byte operation: mkword(lsb(X), 0)
val lsb = FunctionCallExpression(IdentifierReference(listOf("lsb"), expr.position), mutableListOf(expr.left), expr.position)
val mkword = FunctionCallExpression(IdentifierReference(listOf("mkword"), expr.position), mutableListOf(lsb, NumericLiteral(DataType.UBYTE, 0.0, expr.position)), expr.position)
return TypecastExpression(mkword, DataType.WORD, true, expr.position)
}
else if (amount > 8) {
// same as above but with residual shifts.
val lsb = FunctionCallExpression(IdentifierReference(listOf("lsb"), expr.position), mutableListOf(expr.left), expr.position)
val shifted = BinaryExpression(lsb, "<<", NumericLiteral.optimalInteger(amount - 8, expr.position), expr.position)
val mkword = FunctionCallExpression(IdentifierReference(listOf("mkword"), expr.position), mutableListOf(shifted, NumericLiteral.optimalInteger(0, expr.position)), expr.position)
return TypecastExpression(mkword, DataType.WORD, true, expr.position)
}
}
else -> {
}
}

1
docs/source/todo.rst
View File

@ -3,7 +3,6 @@ TODO
For next release
^^^^^^^^^^^^^^^^
- word << 12 is suddenly an uword
- ir/vm: allow label in block scope
- regression test the various projects
- 6502 codegen: make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``p8v_``? Or not worth it (most 3 letter opcodes as variables are nonsensical anyway)