+ //===--------------------------------------------------------------------===//
+ /// \brief This struct is used by SelectionDAGISel to temporarily override
+ /// the optimization level on a per-function basis.
+ class OptLevelChanger {
+ SelectionDAGISel &IS;
+ CodeGenOpt::Level SavedOptLevel;
+
+ public:
+ OptLevelChanger(SelectionDAGISel &ISel,
+ CodeGenOpt::Level NewOptLevel) : IS(ISel) {
+ SavedOptLevel = IS.OptLevel;
+ if (NewOptLevel == SavedOptLevel)
+ return;
+ IS.OptLevel = NewOptLevel;
+ IS.TM.setOptLevel(NewOptLevel);
+ DEBUG(dbgs() << "\nChanging optimization level for Function "
+ << IS.MF->getFunction()->getName() << "\n");
+ DEBUG(dbgs() << "\tBefore: -O" << SavedOptLevel
+ << " ; After: -O" << NewOptLevel << "\n");
+ }
+
+ ~OptLevelChanger() {
+ if (IS.OptLevel == SavedOptLevel)
+ return;
+ DEBUG(dbgs() << "\nRestoring optimization level for Function "
+ << IS.MF->getFunction()->getName() << "\n");
+ DEBUG(dbgs() << "\tBefore: -O" << IS.OptLevel
+ << " ; After: -O" << SavedOptLevel << "\n");
+ IS.OptLevel = SavedOptLevel;
+ IS.TM.setOptLevel(SavedOptLevel);
+ }
+ };
+