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...& runtime hit of >> thunking ret, I really don't see a good motivation for us teaching the >> compiler how to do this. >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180207/0041690f/attachment.html>

Also, could you patch and test Clang with the Linux kernel after I make this change? I'd like to know that we actually successfully call the correct thunks and that they behave correctly. I'm not super worried, but good to actually get this right. I'm am slightly more worried about the stack-based retpoline than the register ones just due to the overall lower amount of testing