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fix: only push one item to stack on comparisons

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This commit is contained in:
Gleb Koval 2025-02-26 20:00:42 +00:00
parent 631f9ddca5
commit 2cf18a47a8
Signed by: cyclane
GPG Key ID: 15E168A8B332382C
3 changed files with 14 additions and 13 deletions
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20
src/main/wacc/backend/asmGenerator.scala
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@ -317,12 +317,12 @@ object asmGenerator {
chain += stack.drop()
chain += stack.push(RDX)
case BinaryOperator.Eq => chain ++= generateComparison(x, y, Cond.Equal)
case BinaryOperator.Neq => chain ++= generateComparison(x, y, Cond.NotEqual)
case BinaryOperator.Greater => chain ++= generateComparison(x, y, Cond.Greater)
case BinaryOperator.GreaterEq => chain ++= generateComparison(x, y, Cond.GreaterEqual)
case BinaryOperator.Less => chain ++= generateComparison(x, y, Cond.Less)
case BinaryOperator.LessEq => chain ++= generateComparison(x, y, Cond.LessEqual)
case BinaryOperator.Eq => chain ++= generateComparison(Cond.Equal)
case BinaryOperator.Neq => chain ++= generateComparison(Cond.NotEqual)
case BinaryOperator.Greater => chain ++= generateComparison(Cond.Greater)
case BinaryOperator.GreaterEq => chain ++= generateComparison(Cond.GreaterEqual)
case BinaryOperator.Less => chain ++= generateComparison(Cond.Less)
case BinaryOperator.LessEq => chain ++= generateComparison(Cond.LessEqual)
case BinaryOperator.And => chain += And(stack.head(SizeDir.DWord), EAX)
case BinaryOperator.Or => chain += Or(stack.head(SizeDir.DWord), EAX)
}
@ -367,18 +367,14 @@ object asmGenerator {
chain
}
def generateComparison(x: Expr, y: Expr, cond: Cond)(using
def generateComparison(cond: Cond)(using
stack: Stack,
strings: ListBuffer[String],
labelGenerator: LabelGenerator
): Chain[AsmLine] = {
var chain = Chain.empty[AsmLine]
chain ++= evalExprOntoStack(x)
chain ++= evalExprOntoStack(y)
chain += stack.pop(RAX)
chain += Compare(stack.head(SizeDir.DWord), EAX)
chain += Compare(EAX, stack.head(SizeDir.DWord))
chain += Set(Register(RegSize.Byte, RegName.AL), cond)
chain += And(RAX, ImmediateVal(_8_BIT_MASK))
chain += stack.drop()

5
src/main/wacc/backend/assemblyIR.scala
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@ -126,6 +126,11 @@ object assemblyIR {
override def toString = s"$name:"
}
case class Comment(comment: String) extends AsmLine {
override def toString =
comment.split("\n").map(line => s"# ${line}").mkString("\n")
}
enum Cond {
case Equal,
NotEqual,

2
src/test/wacc/examples.scala
View File

@ -102,7 +102,7 @@ class ParallelExamplesSpec extends AnyFlatSpec with BeforeAndAfterAll {
"^.*wacc-examples/valid/scope.*$",
// "^.*wacc-examples/valid/sequence.*$",
// "^.*wacc-examples/valid/variables.*$",
"^.*wacc-examples/valid/while.*$",
// "^.*wacc-examples/valid/while.*$",
// format: on
).find(filename.matches).isDefined
}