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
@@ -13,25 +13,6 @@ 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 statements:
// val nestedFirst = uintProgression.first
// val nestedLast = uintProgression.last
// val nestedStep = uintProgression.step
// val maybeNegatedStep = if (nestedStep <= 0) -2 else 2
//
// // Standard form of loop over progression
// var inductionVar = nestedFirst
// val last = getProgressionLastElement(nestedFirst, nestedLast, maybeNegatedStep)
// if ((maybeNegatedStep > 0 && inductionVar <= last) || (maybeNegatedStep < 0 && last <= inductionVar)) {
// // Loop is not empty
// do {
// val i = inductionVar
// inductionVar += maybeNegatedStep
// // Loop body
// } while (i != last)
// }
// 0 iterator
// 0 getStart
@@ -44,10 +25,15 @@ fun box(): String {
// 0 ATHROW
// 2 INVOKESTATIC kotlin/UnsignedKt.uintCompare
// 2 IFGT
// 1 IF_ICMPNE
// 1 IF_ICMPEQ
// 2 IFLE
// 1 IFGE
// 6 IF
// 0 INEG
// 0 INVOKESTATIC kotlin/UInt.constructor-impl
// 0 INVOKE\w+ kotlin/UInt.(un)?box-impl
// 21 ILOAD
// 13 ISTORE
// 1 IADD
// 0 ISUB
// 0 IINC