[PATCH] D122472: [PowerPC][Atomics] Fix lowering of llvm.ppc.cfence on i128 if `-ppc-quadword-atomics` is not specified

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
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The failure happens when frontend doesn't emit libcall for 16byte atomic load/store, and AtomicExpandPass emits `llvm.ppc.cfence` for ordering.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122472

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/test/CodeGen/PowerPC/atomics-i128-ldst.ll
  llvm/test/CodeGen/PowerPC/cfence-i128.ll

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