JVM_IR generate range-based loop closer to Java counter loop

KT-48435 KT-48507
This commit is contained in:
Dmitry Petrov
2021-09-01 15:31:19 +03:00
parent 9ed08438d5
commit b669de1663
137 changed files with 1518 additions and 573 deletions
@@ -1,4 +1,14 @@
// TARGET_BACKEND: 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 box(): String {
for (i in 1..5 step 2 step 1) {
}
@@ -11,22 +21,6 @@ fun box(): String {
// If the step is non-constant, there is a check that it is > 0, and if not, an IllegalArgumentException is thrown. However, when the
// step is constant and > 0, this check does not need to be added.
//
// Expected lowered form of loop:
//
// // Additional variables:
// val innerNestedLast = getProgressionLastElement(1, 5, 2)
//
// // Standard form of loop over progression
// var inductionVar = 1
// val last = innerNestedLast
// if (inductionVar <= last) {
// // Loop is not empty
// do {
// val i = inductionVar
// inductionVar += 1
// // Loop body
// } while (i != last)
// }
// 0 iterator
// 0 getStart
@@ -38,5 +32,10 @@ fun box(): String {
// 0 NEW java/lang/IllegalArgumentException
// 0 ATHROW
// 1 IF_ICMPGT
// 1 IF_ICMPNE
// 2 IF
// 1 IF_ICMPEQ
// 2 IF
// 4 ILOAD
// 2 ISTORE
// 0 IADD
// 0 ISUB
// 1 IINC