Mark Punzalan
51 lines
1.6 KiB
Kotlin
Vendored
51 lines
1.6 KiB
Kotlin
Vendored
// TARGET_BACKEND: JVM_IR
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fun box(): String {
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val intProgression = 1..7 step 3 // `step` ensures type is IntProgression, NOT IntRange
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for (i in intProgression step 2) {
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}
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return "OK"
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}
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// For "step" progressions in JVM IR, a call to getProgressionLastElement() is made to compute the "last" value.
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// If "step" is called on a non-literal progression, there is a check to see if that progression's step value is < 0.
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// If the step is non-constant, there is a check that it is > 0, and if not, an IllegalArgumentException is thrown. However, when the
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// step is constant and > 0, this check does not need to be added.
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//
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// Expected lowered form of loop:
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//
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// // Additional statements:
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// val nestedFirst = intProgression.first
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// val nestedLast = intProgression.last
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// val nestedStep = intProgression.step
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// val maybeNegatedStep = if (nestedStep <= 0) -2 else 2
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//
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// // Standard form of loop over progression
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// var inductionVar = nestedFirst
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// val last = getProgressionLastElement(nestedFirst, nestedLast, maybeNegatedStep)
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// if ((maybeNegatedStep > 0 && inductionVar <= last) || (maybeNegatedStep < 0 && last <= inductionVar)) {
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// // Loop is not empty
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// do {
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// val i = inductionVar
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// inductionVar += maybeNegatedStep
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// // Loop body
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// } while (i != last)
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// }
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// 0 iterator
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// 0 getStart
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// 0 getEnd
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// 1 getFirst
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// 1 getLast
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// 1 getStep
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// 1 INVOKESTATIC kotlin/internal/ProgressionUtilKt.getProgressionLastElement
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// 0 NEW java/lang/IllegalArgumentException
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// 0 ATHROW
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// 1 IF_ICMPGT
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// 1 IF_ICMPLE
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// 1 IF_ICMPNE
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// 1 IFLE
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// 1 IFGT
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// 1 IFGE
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// 6 IF
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// 0 INEG |