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JVM_IR KT-46864 handle "unused" LDC instructions properly

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This commit is contained in:
Dmitry Petrov
2021-05-31 12:03:30 +03:00
committed by TeamCityServer
parent be097244d4
commit 9091ca7b51
11 changed files with 111 additions and 11 deletions
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compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/StackPeepholeOptimizationsTransformer.kt
+15 -11
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@@ -19,14 +19,12 @@ package org.jetbrains.kotlin.codegen.optimization.boxing
import org.jetbrains.kotlin.codegen.optimization.common.findPreviousOrNull
import org.jetbrains.kotlin.codegen.optimization.transformer.MethodTransformer
import org.jetbrains.org.objectweb.asm.Opcodes
import org.jetbrains.org.objectweb.asm.tree.AbstractInsnNode
import org.jetbrains.org.objectweb.asm.tree.InsnList
import org.jetbrains.org.objectweb.asm.tree.InsnNode
import org.jetbrains.org.objectweb.asm.tree.MethodNode
import org.jetbrains.org.objectweb.asm.tree.*
class StackPeepholeOptimizationsTransformer : MethodTransformer() {
override fun transform(internalClassName: String, methodNode: MethodNode) {
while (transformOnce(methodNode)) {
while (true) {
if (!transformOnce(methodNode)) break
}
}
@@ -115,20 +113,26 @@ class StackPeepholeOptimizationsTransformer : MethodTransformer() {
opcode == Opcodes.DUP
private fun AbstractInsnNode.isPurePushOfSize1(): Boolean =
opcode in Opcodes.ACONST_NULL..Opcodes.FCONST_2 ||
opcode in Opcodes.BIPUSH..Opcodes.ILOAD ||
opcode == Opcodes.FLOAD ||
opcode == Opcodes.ALOAD ||
isUnitInstance()
!isLdcOfSize2() && (
opcode in Opcodes.ACONST_NULL..Opcodes.FCONST_2 ||
opcode in Opcodes.BIPUSH..Opcodes.ILOAD ||
opcode == Opcodes.FLOAD ||
opcode == Opcodes.ALOAD ||
isUnitInstance()
)
private fun AbstractInsnNode.isEliminatedByPop2() =
isPurePushOfSize2() ||
opcode == Opcodes.DUP2
private fun AbstractInsnNode.isPurePushOfSize2(): Boolean =
opcode == Opcodes.LCONST_0 || opcode == Opcodes.LCONST_1 ||
isLdcOfSize2() ||
opcode == Opcodes.LCONST_0 || opcode == Opcodes.LCONST_1 ||
opcode == Opcodes.DCONST_0 || opcode == Opcodes.DCONST_1 ||
opcode == Opcodes.LLOAD ||
opcode == Opcodes.DLOAD
private fun AbstractInsnNode.isLdcOfSize2(): Boolean =
opcode == Opcodes.LDC && this is LdcInsnNode && (this.cst is Double || this.cst is Long)
}