[PATCH] D134691: [MC] Don't emit redundant compact unwind entries

[Jez Ng via Phabricator via llvm-commits]

int3 added a comment.

Oh, thanks for your example, I wasn't aware of that. Just to make sure I understand, if a function has an encoding of 0x0 in the final binary's `__unwind_info`, that means you cannot throw anything across the frame?

Also, the x86_64 MC backend is a lot more aggressive about omitting unwind info (https://discourse.llvm.org/t/does-it-make-sense-for-a-function-to-have-a-personality-lsda-if-it-has-no-other-unwind-info-mach-o/65490). Curious if you have thoughts on that. Is that a bug in x86_64, or does the arm64 unwinder work differently?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D134691/new/

https://reviews.llvm.org/D134691