Method CollectNonSemanticTree

source/opt/ir_context.cpp:260–280

}

void IRContext::CollectNonSemanticTree(
    Instruction* inst, std::unordered_set<Instruction*>* to_kill) {
  if (!inst->HasResultId()) return;
  // Debug[No]Line result id is not used, so we are done
  if (inst->IsDebugLineInst()) return;
  std::vector<Instruction*> work_list;
  std::unordered_set<Instruction*> seen;
  work_list.push_back(inst);

  while (!work_list.empty()) {
    auto* i = work_list.back();
    work_list.pop_back();
    get_def_use_mgr()->ForEachUser(
        i, [&work_list, to_kill, &seen](Instruction* user) {
          if (user->IsNonSemanticInstruction() && seen.insert(user).second) {
            work_list.push_back(user);
            to_kill->insert(user);
          }
        });
  }
}

bool IRContext::KillDef(uint32_t id) {
  Instruction* def = get_def_use_mgr()->GetDef(id);