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Hi there lowering experts, Can the llvm.mem* intrinsics ever turn into a library call? Or do they invariably turn into inline code? This comes up because there was a patch to StackProtector to use CaptureTracking instead of a home-grown analysis, which changes the treatment of calls to intrinsics. (The old code treated them as normal calls, the new code decides intrinsics can never capture.)

...yout here, so certain casts are considered free. The idea of "free" here has little to do with the cost to execute the operation and more to do with the fact that we don't want them to be barriers to optimization. The interface would also provide useful queries like isDuplicatable and isLoweredToCall. Why do I care? This is holding up my work to improve LoopRotate, because I want to design heuristics independent of TTI. But more generally we want to better sandbox TTI (more on that in some later thread). I'm hoping for quick feedback on the implementation of the next small step in this di...