efriedma added a comment. The part I'm confused about is that you're forcing it to use "*r". At the IR level, LLVM handles something like `call void asm sideeffect "#$0", "r"([8 x i64] %c)` fine. You'll have to do a bit of work to teach clang to emit that, but it shouldn't be that hard. I think you can deal with it on the isel end with some relatively small changes to D94097 <https://reviews.llvm.org/D94097>.
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