[PATCH] D122868: [PowerPC] Adjust `MaxAtomicSizeInBitsSupported` on PPC64

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
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AtomicExpandPass uses this variable to determine emitting libcalls or not. The default value is 1024 and if we don't specify it for PPC64 explicitly, AtomicExpandPass won't emit `__atomic_*` libcalls for those target unable to inline atomic ops and finally the backend emits `__sync_*` libcalls. Thanks @efriedma for pointing it out.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122868

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/atomics-i128.ll
  llvm/test/Transforms/AtomicExpand/PowerPC/cmpxchg.ll

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