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41 lines
1.3 KiB
Kotlin
Vendored
41 lines
1.3 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 2u until UInt.MIN_VALUE step 2) {
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}
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return "OK"
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}
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// For "until" progressions in JVM IR, there is a check that the range is not empty: upper bound != MIN_VALUE.
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// When the upper bound == const MIN_VALUE, the backend can eliminate the entire loop as dead code.
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// Calls to getProgressionLastElement() are still present because these happen before the eliminated loop.
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//
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// Expected lowered form of loop (before bytecode optimizations):
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//
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// // Standard form of loop over progression
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// var inductionVar = 2u
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// val last = getProgressionLastElement(2u, UInt.MIN_VALUE - 1, 2) // `(UInt.MIN_VALUE - 1)` underflows to UInt.MAX_VALUE
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// val step = 2
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// if (false && inductionVar <= last) { // `false` comes from constant folding of `Int.MIN_VALUE != Int.MIN_VALUE`
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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 += step
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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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// 1 INVOKESTATIC kotlin/internal/UProgressionUtilKt.getProgressionLastElement
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// 0 NEW java/lang/IllegalArgumentException
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// 0 ATHROW
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// 0 IF
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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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