[PATCH] D120026: [ARM] Fix ARM backend to correctly use atomic expansion routines.

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

By "the builtins", do you mean you're using compiler-rt with `-DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=Off`?  That implementation probably don't work on a Cortex-M0, unless you've hacked it somehow; it assumes width-1 lock-free atomics are available.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D120026/new/

https://reviews.llvm.org/D120026