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The LRM (http://llvm.org/docs/LangRef.html#llvm-lifetime-start-intrinsic) essentially states that: - ptr is dead before a call to "lifetime.start size, ptr" - ptr is dead after a call to "lifetime.end size, ptr" This is all good and fine, and the expected use case is that all "lifetime.end size, ptr" markers are matched with a preceding "lifetime.start