[all-commits] [llvm/llvm-project] 1ddc6a: AArch64: support ISel for fence instructions

[Tim Northover via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ddc6ab1a9c321e02da4fab836c5f863a906108b
      https://github.com/llvm/llvm-project/commit/1ddc6ab1a9c321e02da4fab836c5f863a906108b
  Author: Tim Northover <t.p.northover at gmail.com>
  Date:   2022-05-16 (Mon, 16 May 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/arm64-atomic.ll
    M llvm/test/CodeGen/AArch64/fence-singlethread.ll

  Log Message:
  -----------
  AArch64: support ISel for fence instructions

Only the most conservative of the DAG patterns matched, leaving GISel with "dmb
ish" everywhere which is inefficient.