Transforms/Scalar/GVN.cpp

1111 static Value *GetStoreValueForLoad(Value *SrcVal, unsigned Offset,
1114   LLVMContext &Ctx = SrcVal->getType()->getContext();
1116   uint64_t StoreSize = (TD.getTypeSizeInBits(SrcVal->getType()) + 7) / 8;
1123   if (SrcVal->getType()->getScalarType()->isPointerTy())
1124     SrcVal = Builder.CreatePtrToInt(SrcVal,
1125         TD.getIntPtrType(SrcVal->getType()));
1126   if (!SrcVal->getType()->isIntegerTy())
1127     SrcVal = Builder.CreateBitCast(SrcVal, IntegerType::get(Ctx, StoreSize*8));
1137     SrcVal = Builder.CreateLShr(SrcVal, ShiftAmt);
1140     SrcVal = Builder.CreateTrunc(SrcVal, IntegerType::get(Ctx, LoadSize*8));
1142   return CoerceAvailableValueToLoadType(SrcVal, LoadTy, InsertPt, TD);
1150 static Value *GetLoadValueForLoad(LoadInst *SrcVal, unsigned Offset,
1154   // If Offset+LoadTy exceeds the size of SrcVal, then we must be wanting to
1155   // widen SrcVal out to a larger load.
1156   unsigned SrcValSize = TD.getTypeStoreSize(SrcVal->getType());
1159     assert(SrcVal->isSimple() && "Cannot widen volatile/atomic load!");
1160     assert(SrcVal->getType()->isIntegerTy() && "Can't widen non-integer load");
1167     Value *PtrVal = SrcVal->getPointerOperand();
1172     IRBuilder<> Builder(SrcVal->getParent(), ++BasicBlock::iterator(SrcVal));
1177     Builder.SetCurrentDebugLocation(SrcVal->getDebugLoc());
1180     NewLoad->takeName(SrcVal);
1181     NewLoad->setAlignment(SrcVal->getAlignment());
1183     DEBUG(dbgs() << "GVN WIDENED LOAD: " << *SrcVal << "\n");
1191                     NewLoadSize*8-SrcVal->getType()->getPrimitiveSizeInBits());
1192     RV = Builder.CreateTrunc(RV, SrcVal->getType());
1193     SrcVal->replaceAllUsesWith(RV);
1200     gvn.getMemDep().removeInstruction(SrcVal);
1201     SrcVal = NewLoad;
1204   return GetStoreValueForLoad(SrcVal, Offset, LoadTy, InsertPt, TD);