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IR: optimize redundant labels

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Irmen de Jong
2023-11-25 01:08:26 +01:00
parent 6a40f23578
commit 9ef9c24388
3 changed files with 41 additions and 15 deletions
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codeGenIntermediate/test/TestIRPeepholeOpt.kt
+7 -9
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@@ -53,9 +53,9 @@ class TestIRPeepholeOpt: FunSpec({
test("remove jmp to label below") {
val c1 = IRCodeChunk("main.start", null)
c1 += IRInstruction(Opcode.JUMP, labelSymbol = "label") // removed, but chunk stays because of label
c1 += IRInstruction(Opcode.JUMP, labelSymbol = "label")
val c2 = IRCodeChunk("label", null)
c2 += IRInstruction(Opcode.JUMP, labelSymbol = "label2") // removed, but chunk stays because of label
c2 += IRInstruction(Opcode.JUMP, labelSymbol = "label2")
c2 += IRInstruction(Opcode.NOP) // removed
val c3 = IRCodeChunk("label2", null)
c3 += IRInstruction(Opcode.JUMP, labelSymbol = "label3")
@@ -67,15 +67,13 @@ class TestIRPeepholeOpt: FunSpec({
irProg.chunks().flatMap { it.instructions }.size shouldBe 5
val opt = IRPeepholeOptimizer(irProg)
opt.optimize(true, ErrorReporterForTests())
irProg.chunks().size shouldBe 4
irProg.chunks().size shouldBe 3
irProg.chunks()[0].label shouldBe "main.start"
irProg.chunks()[1].label shouldBe "label"
irProg.chunks()[2].label shouldBe "label2"
irProg.chunks()[3].label shouldBe "label3"
irProg.chunks()[1].label shouldBe "label2"
irProg.chunks()[2].label shouldBe "label3"
irProg.chunks()[0].isEmpty() shouldBe true
irProg.chunks()[1].isEmpty() shouldBe true
irProg.chunks()[2].isEmpty() shouldBe false
irProg.chunks()[3].isEmpty() shouldBe true
irProg.chunks()[1].isEmpty() shouldBe false
irProg.chunks()[2].isEmpty() shouldBe true
val instr = irProg.chunks().flatMap { it.instructions }
instr.size shouldBe 2
instr[0].opcode shouldBe Opcode.JUMP