C++ (Cpp) TR_RegionStructure::getEntryBlock示例

示例#1

文件： ExpressionsSimplification.cpp 项目： dinogun/omr

// Process the structure recursively
//
int32_t
TR_ExpressionsSimplification::perform(TR_Structure * str)
   {
   if (trace())
      traceMsg(comp(), "Analyzing root Structure : %p\n", str);

   TR_RegionStructure *region;

   // Only regions can be simplified
   //
   if (!(region = str->asRegion()))
      return 0;

   TR_RegionStructure::Cursor it(*region);

   for (TR_StructureSubGraphNode *node = it.getCurrent();
        node != 0;
        node = it.getNext())
      {
      // Too strict
      /*
      if ((node->getPredecessors().size() == 1))
         {
         TR::CFGEdge *edge = node->getPredecessors().front();
         TR_StructureSubGraphNode *pred = toStructureSubGraphNode(edge->getFrom());
         TR_BlockStructure *b = pred->getStructure()->asBlock();
         if (b && pred->getSuccessors().size() == 1))
            perform(node->getStructure());
         }
      */
      perform(node->getStructure());
      }

   // debug only
   //
   /*
   if (region->isNaturalLoop() &&
          (region->getParent()  &&
            !region->getParent()->asRegion()->isCanonicalizedLoop()))
      {
      traceMsg(comp(), "Loop not canonicalized %x\n", region);
      }
   */

   TR::Block *entryBlock = region->getEntryBlock();
   if (region->isNaturalLoop() && !entryBlock->isCold() &&
          (region->getParent() /* &&
            region->getParent()->asRegion()->isCanonicalizedLoop() */))
         {
         if (trace())
           traceMsg(comp(), "Found candidate non cold loop %p for expression elimination\n", region);

         findAndSimplifyInvariantLoopExpressions(region);
         }

   return 1;  // Need to specify the cost
   }