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Skip NOP instructions in fast pop backward propagation

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This commit is contained in:
Dmitry Petrov
2017-06-30 18:23:43 +03:00
parent 36cbc0defd
commit 614d90d6ef
3 changed files with 17 additions and 3 deletions
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compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/FastPopBackwardPropagationTransformer.kt
+4 -3
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@@ -16,6 +16,7 @@
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
@@ -34,9 +35,9 @@ class FastPopBackwardPropagationTransformer : MethodTransformer() {
val insns = methodNode.instructions.toArray()
for (i in 1 until insns.size) {
forInsn@ for (i in 1 until insns.size) {
val insn = insns[i]
val prev = insns[i - 1]
val prev = insn.findPreviousOrNull { it.opcode != Opcodes.NOP } ?: continue@forInsn
when (insn.opcode) {
Opcodes.POP -> {
@@ -52,7 +53,7 @@ class FastPopBackwardPropagationTransformer : MethodTransformer() {
toRemove.add(prev)
}
else if (i > 1) {
val prev2 = insns[i - 2]
val prev2 = prev.findPreviousOrNull { it.opcode != Opcodes.NOP } ?: continue@forInsn
if (prev.isEliminatedByPop() && prev2.isEliminatedByPop()) {
toReplaceWithNop.add(insn)
toRemove.add(prev)