compiler/optimizing/code_generator_x86.cc [4333:4353]:
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void CodeGeneratorX86::GenerateMemoryBarrier(MemBarrierKind kind) {
  /*
   * According to the JSR-133 Cookbook, for x86 only StoreLoad/AnyAny barriers need memory fence.
   * All other barriers (LoadAny, AnyStore, StoreStore) are nops due to the x86 memory model.
   * For those cases, all we need to ensure is that there is a scheduling barrier in place.
   */
  switch (kind) {
    case MemBarrierKind::kAnyAny: {
      MemoryFence();
      break;
    }
    case MemBarrierKind::kAnyStore:
    case MemBarrierKind::kLoadAny:
    case MemBarrierKind::kStoreStore: {
      // nop
      break;
    }
    default:
      LOG(FATAL) << "Unexpected memory barrier " << kind;
  }
}
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compiler/optimizing/code_generator_x86_64.cc [4061:4081]:
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void CodeGeneratorX86_64::GenerateMemoryBarrier(MemBarrierKind kind) {
  /*
   * According to the JSR-133 Cookbook, for x86 only StoreLoad/AnyAny barriers need memory fence.
   * All other barriers (LoadAny, AnyStore, StoreStore) are nops due to the x86-64 memory model.
   * For those cases, all we need to ensure is that there is a scheduling barrier in place.
   */
  switch (kind) {
    case MemBarrierKind::kAnyAny: {
      MemoryFence();
      break;
    }
    case MemBarrierKind::kAnyStore:
    case MemBarrierKind::kLoadAny:
    case MemBarrierKind::kStoreStore: {
      // nop
      break;
    }
    default:
      LOG(FATAL) << "Unexpected memory barier " << kind;
  }
}
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