[PATCH] D129838: [LoongArch] Optimize the atomic store with amswap_db.[w/d]

[Gong LingQin via Phabricator via llvm-commits]

gonglingqin created this revision.
gonglingqin added reviewers: xry111, SixWeining, MaskRay, xen0n, lkail.
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When AtomicOrdering is release or stronger, use

  amswap_db.[w/d] $zero, $a1, $a0

instead of

  dbar 0
  st.[w/d] $a0, $a1, 0

Thanks to @xry111 for the suggestion: https://reviews.llvm.org/D128901#3626635


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129838

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.h
  llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
  llvm/test/CodeGen/LoongArch/ir-instruction/load-store-atomic.ll
  llvm/test/Transforms/AtomicExpand/LoongArch/load-store-atomic.ll

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