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static int roundUpToPowerOfTwo(int v) { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; ret v+1; } static long roundUpToPowerOfTwo(long v) { int i = Long.highestOneBit(v); ret v > i ? v << 1 : i; }