Method processLoopScopes

GPCS4/Graphics/Gcn/ControlFlowGraph/GcnStackifier.cpp:261–307

	}

	void GcnTokenListBuilder::processLoopScopes(GcnCfgVertex vtx)
	{
		do 
		{
			const auto loop = m_loopInfo.getLoop(vtx);
			if (!loop)
			{
				break;
			}

			if (loop->getHeader() == vtx)
			{
				auto loopToken    = m_factory.createLoop();
				auto loopEndToken = m_factory.createLoopEnd(loopToken);

				auto loopPtr = m_tokens->insertAfter(m_insertPtr, loopToken);
				auto endPtr  = m_tokens->insertAfter(loopPtr, loopEndToken);
				m_insertPtr  = loopPtr;

				Scope loopScope = { Scope::Loop, vtx, endPtr, true };
				m_scopeStack.push_back(loopScope);

				m_loopCounts.insert(std::make_pair(loop, loop->getNumVertices()));
				m_loopHeaders.insert(std::make_pair(vtx, loopToken));
			}

			// Decrement the loop count
			auto iter = m_loopCounts.find(loop);
			LOG_ASSERT(iter != m_loopCounts.end(), "loop not recorded.");
			--iter->second;

			// If the loop has parent, 
			// then loop header is one of the vertices of parent loop,
			// decrement parent by one when count is 0.
			while (iter->second == 0)
			{
				auto parent = iter->first->getParentLoop();
				iter        = m_loopCounts.find(parent);
				if (iter == m_loopCounts.end())
				{
					break;
				}
				--iter->second;
			}
	
		} while (false);
	}

	void GcnTokenListBuilder::processBlockScopes(const std::vector<GcnToken*>& branches)
	{