2543     SmallPtrSet<MachineBasicBlock *, 32> DefBlocks;  in placeMLocPHIs()  local
2548         DefBlocks.insert(MBB);  in placeMLocPHIs()
2554     if (!DefBlocks.empty())  in placeMLocPHIs()
2555       DefBlocks.insert(&*MF.begin());  in placeMLocPHIs()
2560     BlockPHIPlacement(AllBlocks, DefBlocks, PHIBlocks);  in placeMLocPHIs()
2751     const SmallPtrSetImpl<MachineBasicBlock *> &DefBlocks,  in BlockPHIPlacement()  argument
2759   IDF.setDefiningBlocks(DefBlocks);  in BlockPHIPlacement()
3180     SmallPtrSet<MachineBasicBlock *, 32> DefBlocks;  in buildVLocValueMap()  local
3184         DefBlocks.insert(const_cast<MachineBasicBlock *>(ExpMBB));  in buildVLocValueMap()
3191     if (DefBlocks.size() == 1) {  in buildVLocValueMap()
3192       placePHIsForSingleVarDefinition(MutBlocksToExplore, *DefBlocks.begin(),  in buildVLocValueMap()
3198     BlockPHIPlacement(MutBlocksToExplore, DefBlocks, PHIBlocks);  in buildVLocValueMap()