Example #1
0
MachineBasicBlock::iterator
Filler::findDelayInstr(MachineBasicBlock &MBB,
                       MachineBasicBlock::iterator slot)
{
  SmallSet<unsigned, 32> RegDefs;
  SmallSet<unsigned, 32> RegUses;
  bool sawLoad = false;
  bool sawStore = false;

  MachineBasicBlock::iterator I = slot;

  if (slot->getOpcode() == SP::RET)
    return MBB.end();

  if (slot->getOpcode() == SP::RETL) {
    --I;
    if (I->getOpcode() != SP::RESTORErr)
      return MBB.end();
    //change retl to ret
    slot->setDesc(TII->get(SP::RET));
    return I;
  }

  //Call's delay filler can def some of call's uses.
  if (slot->getDesc().isCall())
    insertCallUses(slot, RegUses);
  else
    insertDefsUses(slot, RegDefs, RegUses);

  bool done = false;

  while (!done) {
    done = (I == MBB.begin());

    if (!done)
      --I;

    // skip debug value
    if (I->isDebugValue())
      continue;


    if (I->hasUnmodeledSideEffects()
        || I->isInlineAsm()
        || I->isLabel()
        || I->getDesc().hasDelaySlot()
        || isDelayFiller(MBB, I))
      break;

    if (delayHasHazard(I, sawLoad, sawStore, RegDefs, RegUses)) {
      insertDefsUses(I, RegDefs, RegUses);
      continue;
    }

    return I;
  }
  return MBB.end();
}
Example #2
0
MachineBasicBlock::iterator
MachineBasicBlock::SkipPHIsAndLabels(MachineBasicBlock::iterator I) {
  iterator E = end();
  while (I != E && (I->isPHI() || I->isLabel() || I->isDebugValue()))
    ++I;
  // FIXME: This needs to change if we wish to bundle labels / dbg_values
  // inside the bundle.
  assert(!I->isInsideBundle() &&
         "First non-phi / non-label instruction is inside a bundle!");
  return I;
}
MachineBasicBlock::iterator
MachineBasicBlock::SkipPHIsAndLabels(MachineBasicBlock::iterator I) {
  while (I != end() && (I->isPHI() || I->isLabel() || I->isDebugValue()))
    ++I;
  return I;
}