[PATCH] D18046: [X86] Providing correct unwind info in function epilogue

[Keno Fischer via llvm-commits]

loladiro added a comment.

The key point with that proposal being (which I realized I didn't mention) that one could handle tail duplication by inserting save state at the beginning of the basic block, then remember state just before the duplicated instructions and have everything else as usual. Of course it would then be nice for the late pass to clean this up (e.g. remove save/restore pairs when there's no instructions in between), but at least it would be correct.


Repository:
  rL LLVM

http://reviews.llvm.org/D18046