[all-commits] [llvm/llvm-project] 06c531: BPF: Generate locked insn for __sync_fetch_and_add...

[yonghong-song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 06c531e808ceeafdf996867a2e8e66960ae4774e
      https://github.com/llvm/llvm-project/commit/06c531e808ceeafdf996867a2e8e66960ae4774e
  Author: yonghong-song <yhs at fb.com>
  Date:   2024-08-30 (Fri, 30 Aug 2024)

  Changed paths:
    M llvm/lib/Target/BPF/BPF.h
    M llvm/lib/Target/BPF/BPFInstrInfo.td
    A llvm/lib/Target/BPF/BPFMIChecking.cpp
    M llvm/lib/Target/BPF/BPFTargetMachine.cpp
    M llvm/lib/Target/BPF/CMakeLists.txt
    M llvm/test/CodeGen/BPF/atomics.ll
    M llvm/test/CodeGen/BPF/atomics_2.ll
    M llvm/test/CodeGen/BPF/objdump_atomics.ll
    A llvm/test/CodeGen/BPF/xadd.ll
    M llvm/test/CodeGen/BPF/xadd_legal.ll

  Log Message:
  -----------
  BPF: Generate locked insn for __sync_fetch_and_add() with cpu v1/v2 (#106494)

This patch contains two pars:
- first to revert the patch https://github.com/llvm/llvm-project/pull/101428.
- second to remove `atomic_fetch_and_*()` to `atomic_<op>()`
  conversion (when return value is not used), but preserve 
  `__sync_fetch_and_add()` to locked insn with cpu v1/v2.



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