Method GetOrCreatePreHeaderBlock

source/opt/loop_descriptor.cpp:277–286

}

BasicBlock* Loop::GetOrCreatePreHeaderBlock() {
  if (loop_preheader_) return loop_preheader_;

  CFG* cfg = context_->cfg();
  loop_header_ = cfg->SplitLoopHeader(loop_header_);
  if (loop_header_ == nullptr) {
    return nullptr;
  }
  return loop_preheader_;
}

void Loop::SetContinueBlock(BasicBlock* continue_block) {
  assert(IsInsideLoop(continue_block));