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...ond doesn't get recognised because of the hoisting. The result is some register allocation and unnecessary constant loading instructions. There are maybe three 'solutions' to this problem, maybe more. Starting with the second, in the middle of things, you could try pattern matching in EmitTest() or LowerToBT(). I've tried this and it doesn't work since it needs to reach outside of a Selection DAG. Doesn't work. Can't work. Thirdly, it's been suggested to use a peephole pass and to look at AArch64LoadStoreOptimizer.cpp. This also doesn't work for pretty much the...