lib/CodeGen/MachineSSAUpdater.cpp

69 bool MachineSSAUpdater::HasValueForBlock(MachineBasicBlock *BB) const {
70   return getAvailableVals(AV).count(BB);
75 void MachineSSAUpdater::AddAvailableValue(MachineBasicBlock *BB, Register V) {
76   getAvailableVals(AV)[BB] = V;
81 Register MachineSSAUpdater::GetValueAtEndOfBlock(MachineBasicBlock *BB) {
82   return GetValueAtEndOfBlockInternal(BB);
86 Register LookForIdenticalPHI(MachineBasicBlock *BB,
88   if (BB->empty())
91   MachineBasicBlock::iterator I = BB->begin();
98   while (I != BB->end() && I->isPHI()) {
120                            MachineBasicBlock *BB, MachineBasicBlock::iterator I,
125   return BuildMI(*BB, I, DebugLoc(), TII->get(Opcode), NewVR);
135 /// 'use' in BB.  Consider code like this:
148 Register MachineSSAUpdater::GetValueInMiddleOfBlock(MachineBasicBlock *BB,
152   if (!HasValueForBlock(BB))
153     return GetValueAtEndOfBlockInternal(BB, ExistingValueOnly);
156   if (BB->pred_empty()) {
162                                         BB, BB->getFirstTerminator(),
173   for (MachineBasicBlock *PredBB : BB->predecessors()) {
189   // If an identical PHI is already in BB, just reuse it.
190   Register DupPHI = LookForIdenticalPHI(BB, PredValues);
199   MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
200   MachineInstrBuilder InsertedPHI = InsertNewDef(TargetOpcode::PHI, BB,
259   static BlkSucc_iterator BlkSucc_begin(BlkT *BB) { return BB->succ_begin(); }
260   static BlkSucc_iterator BlkSucc_end(BlkT *BB) { return BB->succ_end(); }
291   /// FindPredecessorBlocks - Put the predecessors of BB into the Preds
293   static void FindPredecessorBlocks(MachineBasicBlock *BB,
295     append_range(*Preds, BB->predecessors());
300   static Register GetUndefVal(MachineBasicBlock *BB,
304                                         BB, BB->getFirstNonPHI(),
312   static Register CreateEmptyPHI(MachineBasicBlock *BB, unsigned NumPreds,
314     MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->begin();
315     MachineInstr *PHI = InsertNewDef(TargetOpcode::PHI, BB, Loc,
360 /// for the specified BB and if so, return it.  If not, construct SSA form by
364 MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB,
367   Register ExistingVal = AvailableVals.lookup(BB);
372   return Impl.GetValue(BB);