[PATCH] D112326: [AArch64] Async unwind - do not schedule frame setup/destroy

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Oh, I understand the issue; we need to ensure that any instruction annotated by a CFI directive is not rescheduled away from the directive.  (This isn't a problem for Windows EH because there's never more than one instruction between two SEH markings.)

I don't see how this is specific to instructions that modify fp, though.  We end up with inaccurate CFI if we put any instruction between an instruction and its associated CFI directive, whether or not that instruction modifies fp.  Can we explicitly check for instructions followed by a CFI directive?


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  https://reviews.llvm.org/D112326/new/

https://reviews.llvm.org/D112326