[PATCH] D72184: [BPF] support atomic instructions

[Alexei Starovoitov via Phabricator via llvm-commits]

ast added a comment.

looks good. Before landing we need to agree on the full set of instructions that -mcpu=v4 will support.
atomic_fetch_or|xor|and are probably needed as instructions. The kernel JIT will generate x86 cmpxchg for them.
Because if llvm generates bpf cmpxchg insn then we'd need to teach the verifier to recognize infinite loops.


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https://reviews.llvm.org/D72184