[PATCH] D48580: [AArch64] Support reserving x1-7 registers.

[Tri Vo via Phabricator via llvm-commits]

trong added a comment.

> - Copy gcc's behavior, ignore that it's broken, and wait for someone to file a bug when a new version of clang breaks the Linux kernel.

Current patch will emit a warning during call lowering if user requests to reserve an argument register and a function call is made. This should hopefully cover calls to builtins (like in your example). But as you pointed out there are probably other places where reserved registers can be spuriously used. I'm not opposed to continuously supporting these flags to build Linux kernel.


https://reviews.llvm.org/D48580