JVM_IR generate range-based loop closer to Java counter loop

KT-48435 KT-48507

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInEmptyListWithIndex.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 val xs = listOf<Any>()
 
 fun box(): String {

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInIterableTypeParameterWithIndex.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 fun <T : Iterable<*>> test(iterable: T): String {
     val s = StringBuilder()
 

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInListWithIndex.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 val xs = listOf("a", "b", "c", "d")
 
 fun box(): String {

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInListWithIndexNoElementVar.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 val xs = listOf("a", "b", "c", "d")
 
 fun box(): String {

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInListWithIndexNoIndexVar.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 val xs = listOf("a", "b", "c", "d")
 
 fun box(): String {

compiler/testData/codegen/bytecodeText/forLoop/forInIterableWithIndex/forInListWithIndexWithExplicitlyTypedIndexVariable.kt

@@ -1,4 +1,14 @@
 // IGNORE_BACKEND_FIR: JVM_IR
+
+// IMPORTANT!
+// Please, when your changes cause failures in bytecodeText tests for 'for' loops,
+// examine the resulting bytecode shape carefully.
+// Range and progression-based loops generated with Kotlin compiler should be
+// as close as possible to Java counter loops ('for (int i = a; i < b; ++i) { ... }').
+// Otherwise it may result in performance regression due to missing HotSpot optimizations.
+// Run Kotlin compiler benchmarks (https://github.com/Kotlin/kotlin-benchmarks)
+// with compiler built from your changes if you are not sure.
+
 val xs = listOf("a", "b", "c", "d")
 
 fun useAny(x: Any) {}