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...to propose that we add intrinsics to support this notion at the IR level; primarily to be able to use scalar evolution to understand the loops instead of having to implement a machine-level analysis for each target. I've posted an RFC with a prototype implementation in https://reviews.llvm.org/D62132. It contains intrinsics that are currently Arm specific, but I hope they're general enough to be used by all targets. The Arm v8.1-m architecture supports do-while and while loops, but for conciseness, here, I'd like to just focus on while loops. There's two parts to this RFC: (1) the i...