コード例 #1
0
bool PatmosInstrInfo::moveTo(MachineBasicBlock &MBB,
                             MachineBasicBlock::iterator &Target,
                             MachineBasicBlock::iterator &Source,
                             SmallVectorImpl<MachineOperand> *Pred,
                             bool Negate) const
{
  if (Target->isBundle()) return false;

  if (Target->getOpcode() == Patmos::NOP) {
    // replace the NOP with the source instruction
    Source = MBB.insert(Target, MBB.remove(Source));
    MBB.erase(Target);

    if (Pred) {
      PredicateInstruction(&*Source, *Pred);
    }
    if (Negate) {
      NegatePredicate(&*Source);
    }

    return true;
  }

  // TODO check if we can bundle the target and the source instruction, do so



  return false;
}
コード例 #2
0
 ClauseFile
 MakeALUClause(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I)
     const {
   MachineBasicBlock::iterator ClauseHead = I;
   std::vector<MachineInstr *> ClauseContent;
   I++;
   for (MachineBasicBlock::instr_iterator E = MBB.instr_end(); I != E;) {
     if (IsTrivialInst(I)) {
       ++I;
       continue;
     }
     if (!I->isBundle() && !TII->isALUInstr(I->getOpcode()))
       break;
     std::vector<int64_t> Literals;
     if (I->isBundle()) {
       MachineInstr *DeleteMI = I;
       MachineBasicBlock::instr_iterator BI = I.getInstrIterator();
       while (++BI != E && BI->isBundledWithPred()) {
         BI->unbundleFromPred();
         for (unsigned i = 0, e = BI->getNumOperands(); i != e; ++i) {
           MachineOperand &MO = BI->getOperand(i);
           if (MO.isReg() && MO.isInternalRead())
             MO.setIsInternalRead(false);
         }
         getLiteral(BI, Literals);
         ClauseContent.push_back(BI);
       }
       I = BI;
       DeleteMI->eraseFromParent();
     } else {
       getLiteral(I, Literals);
       ClauseContent.push_back(I);
       I++;
     }
     for (unsigned i = 0, e = Literals.size(); i < e; i+=2) {
       unsigned literal0 = Literals[i];
       unsigned literal2 = (i + 1 < e)?Literals[i + 1]:0;
       MachineInstr *MILit = BuildMI(MBB, I, I->getDebugLoc(),
           TII->get(AMDGPU::LITERALS))
           .addImm(literal0)
           .addImm(literal2);
       ClauseContent.push_back(MILit);
     }
   }
   ClauseHead->getOperand(7).setImm(ClauseContent.size() - 1);
   return ClauseFile(ClauseHead, ClauseContent);
 }
コード例 #3
0
MachineBasicBlock::iterator
MachineBasicBlock::erase(MachineBasicBlock::iterator I) {
  if (I->isBundle()) {
    MachineBasicBlock::iterator E = llvm::next(I);
    return Insts.erase(I.getInstrIterator(), E.getInstrIterator());
  }

  return Insts.erase(I.getInstrIterator());
}
コード例 #4
0
void MachineBasicBlock::splice(MachineBasicBlock::iterator where,
                               MachineBasicBlock *Other,
                               MachineBasicBlock::iterator From) {
  if (From->isBundle()) {
    MachineBasicBlock::iterator To = llvm::next(From);
    Insts.splice(where.getInstrIterator(), Other->Insts,
                 From.getInstrIterator(), To.getInstrIterator());
    return;
  }

  Insts.splice(where.getInstrIterator(), Other->Insts, From.getInstrIterator());
}
コード例 #5
0
bool SILowerControlFlowPass::shouldSkip(MachineBasicBlock *From,
                                        MachineBasicBlock *To) {

  unsigned NumInstr = 0;

  for (MachineBasicBlock *MBB = From; MBB != To && !MBB->succ_empty();
       MBB = *MBB->succ_begin()) {

    for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
         NumInstr < SkipThreshold && I != E; ++I) {

      if (I->isBundle() || !I->isBundled())
        if (++NumInstr >= SkipThreshold)
          return true;
    }
  }

  return false;
}
コード例 #6
0
bool PatmosDelaySlotKiller::killDelaySlots(MachineBasicBlock &MBB) {
  bool Changed = false;

  DEBUG( dbgs() << "Killing slots in BB#" << MBB.getNumber()
                << " (" << MBB.getFullName() << ")\n" );

  // consider the basic block from top to bottom
  for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I) {
    // Control-flow instructions ("proper" delay slots)
    if (I->hasDelaySlot()) {
      assert( ( I->isCall() || I->isReturn() || I->isBranch() )
              && "Unexpected instruction with delay slot.");

      MachineBasicBlock::instr_iterator MI = *I;
      if (I->isBundle()) { ++MI; }

      unsigned Opcode = MI->getOpcode();

      if (Opcode == Patmos::BR ||
          Opcode == Patmos::BRu ||
          Opcode == Patmos::BRR ||
          Opcode == Patmos::BRRu ||
          Opcode == Patmos::BRT ||
          Opcode == Patmos::BRTu ||
          Opcode == Patmos::BRCF ||
          Opcode == Patmos::BRCFu ||
          Opcode == Patmos::BRCFR ||
          Opcode == Patmos::BRCFRu ||
          Opcode == Patmos::BRCFT ||
          Opcode == Patmos::BRCFTu ||
          Opcode == Patmos::CALL ||
          Opcode == Patmos::CALLR ||
          Opcode == Patmos::RET ||
          Opcode == Patmos::XRET) {

        bool onlyNops = true;
        unsigned maxCount = TM.getSubtargetImpl()->getDelaySlotCycles(&*I);
        unsigned count = 0;
        for (MachineBasicBlock::iterator K = llvm::next(I), E = MBB.end();
             K != E && count < maxCount; ++K, ++count) {
          TII->skipPseudos(MBB, K);
          if (K->getOpcode() != Patmos::NOP) {
            onlyNops = false;
          }
        }
        if (onlyNops) {
          unsigned NewOpcode = 0;
          switch(Opcode) {
          case Patmos::BR:     NewOpcode = Patmos::BRND; break;
          case Patmos::BRu:    NewOpcode = Patmos::BRNDu; break;
          case Patmos::BRR:    NewOpcode = Patmos::BRRND; break;
          case Patmos::BRRu:   NewOpcode = Patmos::BRRNDu; break;
          case Patmos::BRT:    NewOpcode = Patmos::BRTND; break;
          case Patmos::BRTu:   NewOpcode = Patmos::BRTNDu; break;
          case Patmos::BRCF:   NewOpcode = Patmos::BRCFND; break;
          case Patmos::BRCFu:  NewOpcode = Patmos::BRCFNDu; break;
          case Patmos::BRCFR:  NewOpcode = Patmos::BRCFRND; break;
          case Patmos::BRCFRu: NewOpcode = Patmos::BRCFRNDu; break;
          case Patmos::BRCFT:  NewOpcode = Patmos::BRCFTND; break;
          case Patmos::BRCFTu: NewOpcode = Patmos::BRCFTNDu; break;
          case Patmos::CALL:   NewOpcode = Patmos::CALLND; break;
          case Patmos::CALLR:  NewOpcode = Patmos::CALLRND; break;
          case Patmos::RET:    NewOpcode = Patmos::RETND; break;
          case Patmos::XRET:   NewOpcode = Patmos::XRETND; break;
          }
          const MCInstrDesc &nonDelayed = TII->get(NewOpcode);
          MI->setDesc(nonDelayed);

          unsigned killCount = 0;
          MachineBasicBlock::iterator K = llvm::next(I);
          for (MachineBasicBlock::iterator E = MBB.end();
               K != E && killCount < count; ++K, ++killCount) {
            TII->skipPseudos(MBB, K);
            KilledSlots++;
          }
          MBB.erase(llvm::next(I), K);
        }
      }
      Changed = true; // pass result
    }
  }
  return Changed;
}