[PATCH] D141918: WIP: [Clang] Emit 'unwindabort' when applicable.

[Shoaib Meenai via Phabricator via cfe-commits]

smeenai added a comment.

Thanks for the rebase!

We're eager to try this for Meta's Android apps, where size is a priority and better `noexcept` codegen would be really helpful. I ran into a crash with coroutines though, which blocks me from fully evaluating the size difference made by these changes. The reduced test case is in P8313 <https://reviews.llvm.org/P8313>, and you can repro the crash by running:

  $ clang -std=c++20 -O2 -c crash.cpp
  cannot use musttail with unwindabort
    musttail call unwindabort fastcc void %10(ptr %call57)
  in function _Z5startv.resume
  fatal error: error in backend: Broken function found, compilation aborted!


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D141918/new/

https://reviews.llvm.org/D141918