Target/PowerPC/PPCPreEmitPeephole.cpp

113     // loops - The outer loop finds the load immediates BBI that could be used
115     // after BBI to find redundancy and update kill/dead flags accordingly. If
116     // AfterBBI is the same as BBI, it is redundant, otherwise any instructions
117     // that modify the def register of BBI would break the scanning.
119     // kill/dead flag set. It keeps track of the def register of BBI, the use
127       for (auto BBI = MBB.instr_begin(); BBI != MBB.instr_end(); ++BBI) {
130         if (InstrsToErase.contains(&*BBI))
133         unsigned Opc = BBI->getOpcode();
139         if (!BBI->getOperand(1).isImm())
141         assert(BBI->getOperand(0).isReg() &&
144         LLVM_DEBUG(dbgs() << "Scanning after load immediate: "; BBI->dump(););
146         Register Reg = BBI->getOperand(0).getReg();
147         int64_t Imm = BBI->getOperand(1).getImm();
149         if (BBI->getOperand(0).isDead()) {
150           DeadOrKillToUnset = &BBI->getOperand(0);
152                             << " from load immediate " << *BBI
155         // This loop scans instructions after BBI to see if there is any
157         for (auto AfterBBI = std::next(BBI); AfterBBI != MBB.instr_end();
270       for (auto BBI = MBB.instr_begin(); BBI != MBB.instr_end(); ++BBI) {
272         if (isGOTPLDpc(*BBI)) {
273           GOTDefUsePair CurrentPair{BBI, MachineBasicBlock::iterator(),
274                                     BBI->getOperand(0).getReg(),
291           if (!BBI->readsRegister(Pair.DefReg, TRI) &&
292               !BBI->modifiesRegister(Pair.DefReg, TRI))
298               hasPCRelativeForm(*BBI) ? &BBI->getOperand(2) : nullptr;
303             Pair.UseInst = BBI;
304             Pair.UseReg = BBI->getOperand(0).getReg();
319         MachineBasicBlock::iterator BBI = Pair->DefInst;
320         ++BBI;
321         for (; BBI != Pair->UseInst; ++BBI) {
322           if (BBI->readsRegister(Pair->UseReg, TRI) ||
323               BBI->modifiesRegister(Pair->UseReg, TRI)) {
375       for (MachineInstr &BBI : MBB.instrs()) {
376         unsigned Opc = BBI.getOpcode();
380           Register Acc = BBI.getOperand(0).getReg();
383           Candidates[Acc - PPC::ACC0] = &BBI;
388           Register Acc = BBI.getOperand(0).getReg();
393           InstrsToErase.insert(&BBI);
399           for (MachineOperand &Operand : BBI.operands()) {