예제 #1
0
PointerOffsetPair LoadCombine::getPointerOffsetPair(LoadInst &LI) {
  PointerOffsetPair POP;
  POP.Pointer = LI.getPointerOperand();
  POP.Offset = 0;
  while (isa<BitCastInst>(POP.Pointer) || isa<GetElementPtrInst>(POP.Pointer)) {
    if (auto *GEP = dyn_cast<GetElementPtrInst>(POP.Pointer)) {
      auto &DL = LI.getModule()->getDataLayout();
      unsigned BitWidth = DL.getPointerTypeSizeInBits(GEP->getType());
      APInt Offset(BitWidth, 0);
      if (GEP->accumulateConstantOffset(DL, Offset))
        POP.Offset += Offset.getZExtValue();
      else
        // Can't handle GEPs with variable indices.
        return POP;
      POP.Pointer = GEP->getPointerOperand();
    } else if (auto *BC = dyn_cast<BitCastInst>(POP.Pointer))
      POP.Pointer = BC->getOperand(0);
  }
  return POP;
}
예제 #2
0
파일: LoadCombine.cpp 프로젝트: ralic/llvm
PointerOffsetPair LoadCombine::getPointerOffsetPair(LoadInst &LI) {
  auto &DL = LI.getModule()->getDataLayout();

  PointerOffsetPair POP;
  POP.Pointer = LI.getPointerOperand();
  unsigned BitWidth = DL.getPointerSizeInBits(LI.getPointerAddressSpace());
  POP.Offset = APInt(BitWidth, 0);

  while (isa<BitCastInst>(POP.Pointer) || isa<GetElementPtrInst>(POP.Pointer)) {
    if (auto *GEP = dyn_cast<GetElementPtrInst>(POP.Pointer)) {
      APInt LastOffset = POP.Offset;
      if (!GEP->accumulateConstantOffset(DL, POP.Offset)) {
        // Can't handle GEPs with variable indices.
        POP.Offset = LastOffset;
        return POP;
      }
      POP.Pointer = GEP->getPointerOperand();
    } else if (auto *BC = dyn_cast<BitCastInst>(POP.Pointer)) {
      POP.Pointer = BC->getOperand(0);
    }
  }
  return POP;
}
예제 #3
0
bool Scalarizer::visitLoadInst(LoadInst &LI) {
  if (!ScalarizeLoadStore)
    return false;
  if (!LI.isSimple())
    return false;

  VectorLayout Layout;
  if (!getVectorLayout(LI.getType(), LI.getAlignment(), Layout,
                       LI.getModule()->getDataLayout()))
    return false;

  unsigned NumElems = Layout.VecTy->getNumElements();
  IRBuilder<> Builder(&LI);
  Scatterer Ptr = scatter(&LI, LI.getPointerOperand());
  ValueVector Res;
  Res.resize(NumElems);

  for (unsigned I = 0; I < NumElems; ++I)
    Res[I] = Builder.CreateAlignedLoad(Ptr[I], Layout.getElemAlign(I),
                                       LI.getName() + ".i" + Twine(I));
  gather(&LI, Res);
  return true;
}