Method moveOutwardLoop

GPCS4/Graphics/Gcn/ControlFlowGraph/GcnStackifier.cpp:1150–1179

	}

	GcnToken* GcnGotoEliminator::moveOutwardLoop(GcnToken* gotoToken, const Scope& scope)
	{
		// first, replace the original goto with a value set and insert a break.

		// create a flag variable, initialize to false
		// all variables are global so no need to worry about redefinition.
		auto var = m_factory.createVariable({ 0, GcnScalarType::Bool });
		// set the variable to true, marking the goto happened
		auto setValue = m_factory.createSetValue({ 1, GcnScalarType::Bool }, var);
		// create the break
		auto branch = m_factory.createBranch(scope.end);
		// replace the old goto
		auto ptr = m_tokens->insert(gotoToken->getIterator(), var);
		ptr      = m_tokens->insertAfter(ptr, setValue);
		ptr      = m_tokens->insertAfter(ptr, branch);
		m_tokens->erase(gotoToken);

		// second, move the original conditional goto to the scope end
		auto tokenIf    = m_factory.createIf(GcnConditionOp::EqBool, 1, var);
		auto tokenIfEnd = m_factory.createIfEnd(tokenIf, nullptr);
		auto newGoto    = m_factory.createBranch(gotoToken->getMatch());
		auto resetVar   = m_factory.createSetValue({ 0, GcnScalarType::Bool }, var);

		ptr = m_tokens->insertAfter(scope.end->getIterator(), tokenIf);
		ptr = m_tokens->insertAfter(ptr, resetVar);  // deactive the goto condition
		ptr = m_tokens->insertAfter(ptr, newGoto);
		m_tokens->insertAfter(ptr, tokenIfEnd);

		return newGoto;
	}

	bool GcnGotoEliminator::isBackGoto(GcnToken* gotoToken)
	{