// TARGET_BACKEND: JVM_IR // WITH_RUNTIME fun box(): String { for (i in 2u until UInt.MIN_VALUE step 2) { } return "OK" } // For "until" progressions in JVM IR, there is a check that the range is not empty: upper bound != MIN_VALUE. // When the upper bound == const MIN_VALUE, the backend can eliminate the entire loop as dead code. // Calls to getProgressionLastElement() are still present because these happen before the eliminated loop. // // Expected lowered form of loop (before bytecode optimizations): // // // Standard form of loop over progression // var inductionVar = 2u // val last = getProgressionLastElement(2u, UInt.MIN_VALUE - 1, 2) // `(UInt.MIN_VALUE - 1)` underflows to UInt.MAX_VALUE // val step = 2 // if (false && inductionVar <= last) { // `false` comes from constant folding of `Int.MIN_VALUE != Int.MIN_VALUE` // // Loop is not empty // do { // val i = inductionVar // inductionVar += step // // Loop body // } while (i != last) // } // 0 iterator // 0 getStart // 0 getEnd // 0 getFirst // 0 getLast // 0 getStep // 1 INVOKESTATIC kotlin/internal/UProgressionUtilKt.getProgressionLastElement // 0 NEW java/lang/IllegalArgumentException // 0 ATHROW // 0 IF // 0 INVOKESTATIC kotlin/UInt.constructor-impl // 0 INVOKE\w+ kotlin/UInt.(un)?box-impl