[PATCH] D95891: [ARM] Do not emit ldrexd/strexd on Cortex-M chips

[Ayke via Phabricator via llvm-commits]

aykevl updated this revision to Diff 321151.
aykevl added a comment.

- added comment to `shouldExpandAtomicCmpXchgInIR` explaining Cortex-M exception
- added checks for armv8m architecture (which are the same as armv7m)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D95891/new/

https://reviews.llvm.org/D95891

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/ARM/atomic-64bit.ll

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