Mark Punzalan
b1ce21bc55
"checked step" (check for a positive step arg) and "negated step" (negate the step arg when the nested step is negative).
43 lines
1.1 KiB
Kotlin
Vendored
43 lines
1.1 KiB
Kotlin
Vendored
// TARGET_BACKEND: JVM_IR
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// WITH_RUNTIME
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fun box(): String {
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for (i in 1u..6u step 0) {
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}
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return "OK"
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}
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// For "step" progressions in JVM IR, if the step is constant and <= 0, the expression for step is replaced with an
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// IllegalArgumentException. The backend can then eliminate the entire loop and the rest of the function as dead code.
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//
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// Expected lowered form of loop (before bytecode optimization):
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//
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// // Additional statements:
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// throw IllegalArgumentException("Step must be positive, was: 0.")
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//
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// // Standard form of loop over progression
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// var inductionVar = 1u
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// val last = getProgressionLastElement(1u, 6u, 0)
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// if (inductionVar <= last) {
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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 += 0
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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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// 0 getFirst
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// 0 getLast
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// 0 getStep
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// 0 INVOKESTATIC kotlin/internal/ProgressionUtilKt.getProgressionLastElement
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// 1 NEW java/lang/IllegalArgumentException
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// 1 ATHROW
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// 0 IF
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// 0 ARETURN
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// 0 INVOKESTATIC kotlin/UInt.constructor-impl
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// 0 INVOKE\w+ kotlin/UInt.(un)?box-impl
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