LCOV - code coverage report
Current view: top level - lib/CodeGen/SelectionDAG - LegalizeTypesGeneric.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 265 271 97.8 %
Date: 2018-06-17 00:07:59 Functions: 18 19 94.7 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-------- LegalizeTypesGeneric.cpp - Generic type legalization --------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file implements generic type expansion and splitting for LegalizeTypes.
      11             : // The routines here perform legalization when the details of the type (such as
      12             : // whether it is an integer or a float) do not matter.
      13             : // Expansion is the act of changing a computation in an illegal type to be a
      14             : // computation in two identical registers of a smaller type.  The Lo/Hi part
      15             : // is required to be stored first in memory on little/big-endian machines.
      16             : // Splitting is the act of changing a computation in an illegal type to be a
      17             : // computation in two not necessarily identical registers of a smaller type.
      18             : // There are no requirements on how the type is represented in memory.
      19             : //
      20             : //===----------------------------------------------------------------------===//
      21             : 
      22             : #include "LegalizeTypes.h"
      23             : #include "llvm/IR/DataLayout.h"
      24             : using namespace llvm;
      25             : 
      26             : #define DEBUG_TYPE "legalize-types"
      27             : 
      28             : //===----------------------------------------------------------------------===//
      29             : // Generic Result Expansion.
      30             : //===----------------------------------------------------------------------===//
      31             : 
      32             : // These routines assume that the Lo/Hi part is stored first in memory on
      33             : // little/big-endian machines, followed by the Hi/Lo part.  This means that
      34             : // they cannot be used as is on vectors, for which Lo is always stored first.
      35           0 : void DAGTypeLegalizer::ExpandRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
      36             :                                               SDValue &Lo, SDValue &Hi) {
      37           0 :   SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
      38           0 :   GetExpandedOp(Op, Lo, Hi);
      39           0 : }
      40             : 
      41       10605 : void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) {
      42       21210 :   EVT OutVT = N->getValueType(0);
      43       21210 :   EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT);
      44       10605 :   SDValue InOp = N->getOperand(0);
      45       21210 :   EVT InVT = InOp.getValueType();
      46             :   SDLoc dl(N);
      47             : 
      48             :   // Handle some special cases efficiently.
      49       21210 :   switch (getTypeAction(InVT)) {
      50             :     case TargetLowering::TypeLegal:
      51             :     case TargetLowering::TypePromoteInteger:
      52             :       break;
      53           0 :     case TargetLowering::TypePromoteFloat:
      54           0 :       llvm_unreachable("Bitcast of a promotion-needing float should never need"
      55             :                        "expansion");
      56         477 :     case TargetLowering::TypeSoftenFloat: {
      57             :       // Expand the floating point operand only if it was converted to integers.
      58             :       // Otherwise, it is a legal type like f128 that can be saved in a register.
      59         477 :       auto SoftenedOp = GetSoftenedFloat(InOp);
      60         954 :       if (isLegalInHWReg(SoftenedOp.getValueType()))
      61             :         break;
      62         453 :       SplitInteger(SoftenedOp, Lo, Hi);
      63         906 :       Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
      64         906 :       Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
      65         453 :       return;
      66             :     }
      67         174 :     case TargetLowering::TypeExpandInteger:
      68             :     case TargetLowering::TypeExpandFloat: {
      69         174 :       auto &DL = DAG.getDataLayout();
      70             :       // Convert the expanded pieces of the input.
      71         174 :       GetExpandedOp(InOp, Lo, Hi);
      72         348 :       if (TLI.hasBigEndianPartOrdering(InVT, DL) !=
      73             :           TLI.hasBigEndianPartOrdering(OutVT, DL))
      74             :         std::swap(Lo, Hi);
      75         348 :       Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
      76         348 :       Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
      77         174 :       return;
      78             :     }
      79        2027 :     case TargetLowering::TypeSplitVector:
      80        2027 :       GetSplitVector(InOp, Lo, Hi);
      81        2027 :       if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
      82             :         std::swap(Lo, Hi);
      83        4054 :       Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
      84        4054 :       Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
      85        2027 :       return;
      86        2404 :     case TargetLowering::TypeScalarizeVector:
      87             :       // Convert the element instead.
      88        2404 :       SplitInteger(BitConvertToInteger(GetScalarizedVector(InOp)), Lo, Hi);
      89        4808 :       Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
      90        4808 :       Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
      91        2404 :       return;
      92           1 :     case TargetLowering::TypeWidenVector: {
      93             :       assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BITCAST");
      94           1 :       InOp = GetWidenedVector(InOp);
      95           1 :       EVT LoVT, HiVT;
      96           2 :       std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(InVT);
      97           2 :       std::tie(Lo, Hi) = DAG.SplitVector(InOp, dl, LoVT, HiVT);
      98           1 :       if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
      99             :         std::swap(Lo, Hi);
     100           2 :       Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
     101           2 :       Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
     102             :       return;
     103             :     }
     104             :   }
     105             : 
     106        5546 :   if (InVT.isVector() && OutVT.isInteger()) {
     107             :     // Handle cases like i64 = BITCAST v1i64 on x86, where the operand
     108             :     // is legal but the result is not.
     109             :     unsigned NumElems = 2;
     110        5151 :     EVT ElemVT = NOutVT;
     111        5151 :     EVT NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
     112             : 
     113             :     // If <ElemVT * N> is not a legal type, try <ElemVT/2 * (N*2)>.
     114       14241 :     while (!isTypeLegal(NVT)) {
     115        1318 :       unsigned NewSizeInBits = ElemVT.getSizeInBits() / 2;
     116             :       // If the element size is smaller than byte, bail.
     117        1318 :       if (NewSizeInBits < 8)
     118             :         break;
     119        1313 :       NumElems *= 2;
     120        1313 :       ElemVT = EVT::getIntegerVT(*DAG.getContext(), NewSizeInBits);
     121        1313 :       NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
     122             :     }
     123             : 
     124       10302 :     if (isTypeLegal(NVT)) {
     125       10292 :       SDValue CastInOp = DAG.getNode(ISD::BITCAST, dl, NVT, InOp);
     126             : 
     127             :       SmallVector<SDValue, 8> Vals;
     128       34362 :       for (unsigned i = 0; i < NumElems; ++i)
     129       29216 :         Vals.push_back(DAG.getNode(
     130             :             ISD::EXTRACT_VECTOR_ELT, dl, ElemVT, CastInOp,
     131       58432 :             DAG.getConstant(i, dl, TLI.getVectorIdxTy(DAG.getDataLayout()))));
     132             : 
     133             :       // Build Lo, Hi pair by pairing extracted elements if needed.
     134             :       unsigned Slot = 0;
     135        9462 :       for (unsigned e = Vals.size(); e - Slot > 2; Slot += 2, e += 1) {
     136             :         // Each iteration will BUILD_PAIR two nodes and append the result until
     137             :         // there are only two nodes left, i.e. Lo and Hi.
     138        8632 :         SDValue LHS = Vals[Slot];
     139        8632 :         SDValue RHS = Vals[Slot + 1];
     140             : 
     141        8632 :         if (DAG.getDataLayout().isBigEndian())
     142             :           std::swap(LHS, RHS);
     143             : 
     144        8632 :         Vals.push_back(DAG.getNode(
     145             :             ISD::BUILD_PAIR, dl,
     146        8632 :             EVT::getIntegerVT(*DAG.getContext(), LHS.getValueSizeInBits() << 1),
     147       12948 :             LHS, RHS));
     148             :       }
     149       10292 :       Lo = Vals[Slot++];
     150       10292 :       Hi = Vals[Slot++];
     151             : 
     152       10292 :       if (DAG.getDataLayout().isBigEndian())
     153             :         std::swap(Lo, Hi);
     154             : 
     155             :       return;
     156             :     }
     157             :   }
     158             : 
     159             :   // Lower the bit-convert to a store/load from the stack.
     160             :   assert(NOutVT.isByteSized() && "Expanded type not byte sized!");
     161             : 
     162             :   // Create the stack frame object.  Make sure it is aligned for both
     163             :   // the source and expanded destination types.
     164         800 :   unsigned Alignment = DAG.getDataLayout().getPrefTypeAlignment(
     165         800 :       NOutVT.getTypeForEVT(*DAG.getContext()));
     166         400 :   SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment);
     167         400 :   int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
     168             :   MachinePointerInfo PtrInfo =
     169         400 :       MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SPFI);
     170             : 
     171             :   // Emit a store to the stack slot.
     172         800 :   SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, PtrInfo);
     173             : 
     174             :   // Load the first half from the stack slot.
     175         800 :   Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, PtrInfo);
     176             : 
     177             :   // Increment the pointer to the other half.
     178         400 :   unsigned IncrementSize = NOutVT.getSizeInBits() / 8;
     179         800 :   StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
     180             :                          DAG.getConstant(IncrementSize, dl,
     181         800 :                                          StackPtr.getValueType()));
     182             : 
     183             :   // Load the second half from the stack slot.
     184         800 :   Hi = DAG.getLoad(NOutVT, dl, Store, StackPtr,
     185             :                    PtrInfo.getWithOffset(IncrementSize),
     186         800 :                    MinAlign(Alignment, IncrementSize));
     187             : 
     188             :   // Handle endianness of the load.
     189         800 :   if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
     190             :     std::swap(Lo, Hi);
     191             : }
     192             : 
     193       12251 : void DAGTypeLegalizer::ExpandRes_BUILD_PAIR(SDNode *N, SDValue &Lo,
     194             :                                             SDValue &Hi) {
     195             :   // Return the operands.
     196       12251 :   Lo = N->getOperand(0);
     197       12251 :   Hi = N->getOperand(1);
     198       12251 : }
     199             : 
     200        2740 : void DAGTypeLegalizer::ExpandRes_EXTRACT_ELEMENT(SDNode *N, SDValue &Lo,
     201             :                                                  SDValue &Hi) {
     202        5480 :   GetExpandedOp(N->getOperand(0), Lo, Hi);
     203        8220 :   SDValue Part = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ?
     204        2740 :                    Hi : Lo;
     205             : 
     206             :   assert(Part.getValueType() == N->getValueType(0) &&
     207             :          "Type twice as big as expanded type not itself expanded!");
     208             : 
     209        2740 :   GetPairElements(Part, Lo, Hi);
     210        2740 : }
     211             : 
     212        1844 : void DAGTypeLegalizer::ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo,
     213             :                                                     SDValue &Hi) {
     214        1844 :   SDValue OldVec = N->getOperand(0);
     215        1844 :   unsigned OldElts = OldVec.getValueType().getVectorNumElements();
     216        1844 :   EVT OldEltVT = OldVec.getValueType().getVectorElementType();
     217             :   SDLoc dl(N);
     218             : 
     219             :   // Convert to a vector of the expanded element type, for example
     220             :   // <3 x i64> -> <6 x i32>.
     221        3688 :   EVT OldVT = N->getValueType(0);
     222        3688 :   EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
     223             : 
     224        2030 :   if (OldVT != OldEltVT) {
     225             :     // The result of EXTRACT_VECTOR_ELT may be larger than the element type of
     226             :     // the input vector.  If so, extend the elements of the input vector to the
     227             :     // same bitwidth as the result before expanding.
     228             :     assert(OldEltVT.bitsLT(OldVT) && "Result type smaller then element type!");
     229           3 :     EVT NVecVT = EVT::getVectorVT(*DAG.getContext(), OldVT, OldElts);
     230           9 :     OldVec = DAG.getNode(ISD::ANY_EXTEND, dl, NVecVT, N->getOperand(0));
     231             :   }
     232             : 
     233        1844 :   SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
     234        1844 :                                EVT::getVectorVT(*DAG.getContext(),
     235             :                                                 NewVT, 2*OldElts),
     236        3688 :                                OldVec);
     237             : 
     238             :   // Extract the elements at 2 * Idx and 2 * Idx + 1 from the new vector.
     239        1844 :   SDValue Idx = N->getOperand(1);
     240             : 
     241        3688 :   Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
     242        3688 :   Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
     243             : 
     244        3688 :   Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
     245        3688 :                     DAG.getConstant(1, dl, Idx.getValueType()));
     246        3688 :   Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
     247             : 
     248        3688 :   if (DAG.getDataLayout().isBigEndian())
     249             :     std::swap(Lo, Hi);
     250        1844 : }
     251             : 
     252       70420 : void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo,
     253             :                                             SDValue &Hi) {
     254             :   assert(ISD::isNormalLoad(N) && "This routine only for normal loads!");
     255             :   SDLoc dl(N);
     256             : 
     257             :   LoadSDNode *LD = cast<LoadSDNode>(N);
     258       70420 :   EVT ValueVT = LD->getValueType(0);
     259      140840 :   EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), ValueVT);
     260       70420 :   SDValue Chain = LD->getChain();
     261       70420 :   SDValue Ptr = LD->getBasePtr();
     262       70420 :   unsigned Alignment = LD->getAlignment();
     263       70420 :   AAMDNodes AAInfo = LD->getAAInfo();
     264             : 
     265             :   assert(NVT.isByteSized() && "Expanded type not byte sized!");
     266             : 
     267      140840 :   Lo = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getPointerInfo(), Alignment,
     268       70420 :                    LD->getMemOperand()->getFlags(), AAInfo);
     269             : 
     270             :   // Increment the pointer to the other half.
     271       70420 :   unsigned IncrementSize = NVT.getSizeInBits() / 8;
     272      140840 :   Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
     273      140840 :                     DAG.getConstant(IncrementSize, dl, Ptr.getValueType()));
     274      140840 :   Hi = DAG.getLoad(NVT, dl, Chain, Ptr,
     275             :                    LD->getPointerInfo().getWithOffset(IncrementSize),
     276             :                    MinAlign(Alignment, IncrementSize),
     277      211260 :                    LD->getMemOperand()->getFlags(), AAInfo);
     278             : 
     279             :   // Build a factor node to remember that this load is independent of the
     280             :   // other one.
     281      140840 :   Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
     282      140840 :                       Hi.getValue(1));
     283             : 
     284             :   // Handle endianness of the load.
     285       70420 :   if (TLI.hasBigEndianPartOrdering(ValueVT, DAG.getDataLayout()))
     286             :     std::swap(Lo, Hi);
     287             : 
     288             :   // Modified the chain - switch anything that used the old chain to use
     289             :   // the new one.
     290       70420 :   ReplaceValueWith(SDValue(N, 1), Chain);
     291       70420 : }
     292             : 
     293          16 : void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
     294          16 :   EVT OVT = N->getValueType(0);
     295          32 :   EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT);
     296          16 :   SDValue Chain = N->getOperand(0);
     297          16 :   SDValue Ptr = N->getOperand(1);
     298             :   SDLoc dl(N);
     299          16 :   const unsigned Align = N->getConstantOperandVal(3);
     300             : 
     301          32 :   Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align);
     302          32 :   Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2), 0);
     303             : 
     304             :   // Handle endianness of the load.
     305          16 :   if (TLI.hasBigEndianPartOrdering(OVT, DAG.getDataLayout()))
     306             :     std::swap(Lo, Hi);
     307             : 
     308             :   // Modified the chain - switch anything that used the old chain to use
     309             :   // the new one.
     310          32 :   ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
     311          16 : }
     312             : 
     313             : 
     314             : //===--------------------------------------------------------------------===//
     315             : // Generic Operand Expansion.
     316             : //===--------------------------------------------------------------------===//
     317             : 
     318       43339 : void DAGTypeLegalizer::IntegerToVector(SDValue Op, unsigned NumElements,
     319             :                                        SmallVectorImpl<SDValue> &Ops,
     320             :                                        EVT EltVT) {
     321             :   assert(Op.getValueType().isInteger());
     322             :   SDLoc DL(Op);
     323       43339 :   SDValue Parts[2];
     324             : 
     325       43339 :   if (NumElements > 1) {
     326       19975 :     NumElements >>= 1;
     327       19975 :     SplitInteger(Op, Parts[0], Parts[1]);
     328       39950 :     if (DAG.getDataLayout().isBigEndian())
     329             :         std::swap(Parts[0], Parts[1]);
     330       19975 :     IntegerToVector(Parts[0], NumElements, Ops, EltVT);
     331       19975 :     IntegerToVector(Parts[1], NumElements, Ops, EltVT);
     332             :   } else {
     333       46728 :     Ops.push_back(DAG.getNode(ISD::BITCAST, DL, EltVT, Op));
     334             :   }
     335       43339 : }
     336             : 
     337        3955 : SDValue DAGTypeLegalizer::ExpandOp_BITCAST(SDNode *N) {
     338             :   SDLoc dl(N);
     339       19213 :   if (N->getValueType(0).isVector() &&
     340       10741 :       N->getOperand(0).getValueType().isInteger()) {
     341             :     // An illegal expanding type is being converted to a legal vector type.
     342             :     // Make a two element vector out of the expanded parts and convert that
     343             :     // instead, but only if the new vector type is legal (otherwise there
     344             :     // is no point, and it might create expansion loops).  For example, on
     345             :     // x86 this turns v1i64 = BITCAST i64 into v1i64 = BITCAST v2i32.
     346             :     //
     347             :     // FIXME: I'm not sure why we are first trying to split the input into
     348             :     // a 2 element vector, so I'm leaving it here to maintain the current
     349             :     // behavior.
     350             :     unsigned NumElts = 2;
     351             :     EVT OVT = N->getOperand(0).getValueType();
     352        3389 :     EVT NVT = EVT::getVectorVT(*DAG.getContext(),
     353        6778 :                                TLI.getTypeToTransformTo(*DAG.getContext(), OVT),
     354        6778 :                                NumElts);
     355        6778 :     if (!isTypeLegal(NVT)) {
     356             :       // If we can't find a legal type by splitting the integer in half,
     357             :       // then we can use the node's value type.
     358        4734 :       NumElts = N->getValueType(0).getVectorNumElements();
     359        2367 :       NVT = N->getValueType(0);
     360             :     }
     361             : 
     362             :     SmallVector<SDValue, 8> Ops;
     363        6778 :     IntegerToVector(N->getOperand(0), NumElts, Ops, NVT.getVectorElementType());
     364             : 
     365             :     SDValue Vec =
     366        3389 :         DAG.getBuildVector(NVT, dl, makeArrayRef(Ops.data(), NumElts));
     367       10167 :     return DAG.getNode(ISD::BITCAST, dl, N->getValueType(0), Vec);
     368             :   }
     369             : 
     370             :   // Otherwise, store to a temporary and load out again as the new type.
     371        1132 :   return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
     372             : }
     373             : 
     374       17554 : SDValue DAGTypeLegalizer::ExpandOp_BUILD_VECTOR(SDNode *N) {
     375             :   // The vector type is legal but the element type needs expansion.
     376       35108 :   EVT VecVT = N->getValueType(0);
     377       17554 :   unsigned NumElts = VecVT.getVectorNumElements();
     378       17554 :   EVT OldVT = N->getOperand(0).getValueType();
     379       35108 :   EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
     380             :   SDLoc dl(N);
     381             : 
     382             :   assert(OldVT == VecVT.getVectorElementType() &&
     383             :          "BUILD_VECTOR operand type doesn't match vector element type!");
     384             : 
     385             :   // Build a vector of twice the length out of the expanded elements.
     386             :   // For example <3 x i64> -> <6 x i32>.
     387             :   SmallVector<SDValue, 16> NewElts;
     388       17554 :   NewElts.reserve(NumElts*2);
     389             : 
     390       91130 :   for (unsigned i = 0; i < NumElts; ++i) {
     391       36788 :     SDValue Lo, Hi;
     392       73576 :     GetExpandedOp(N->getOperand(i), Lo, Hi);
     393       73576 :     if (DAG.getDataLayout().isBigEndian())
     394             :       std::swap(Lo, Hi);
     395       36788 :     NewElts.push_back(Lo);
     396       36788 :     NewElts.push_back(Hi);
     397             :   }
     398             : 
     399       17554 :   EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewVT, NewElts.size());
     400       35108 :   SDValue NewVec = DAG.getBuildVector(NewVecVT, dl, NewElts);
     401             : 
     402             :   // Convert the new vector to the old vector type.
     403       52662 :   return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
     404             : }
     405             : 
     406       17938 : SDValue DAGTypeLegalizer::ExpandOp_EXTRACT_ELEMENT(SDNode *N) {
     407       17938 :   SDValue Lo, Hi;
     408       35876 :   GetExpandedOp(N->getOperand(0), Lo, Hi);
     409       53814 :   return cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? Hi : Lo;
     410             : }
     411             : 
     412          30 : SDValue DAGTypeLegalizer::ExpandOp_INSERT_VECTOR_ELT(SDNode *N) {
     413             :   // The vector type is legal but the element type needs expansion.
     414          60 :   EVT VecVT = N->getValueType(0);
     415          30 :   unsigned NumElts = VecVT.getVectorNumElements();
     416             :   SDLoc dl(N);
     417             : 
     418          30 :   SDValue Val = N->getOperand(1);
     419             :   EVT OldEVT = Val.getValueType();
     420          60 :   EVT NewEVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldEVT);
     421             : 
     422             :   assert(OldEVT == VecVT.getVectorElementType() &&
     423             :          "Inserted element type doesn't match vector element type!");
     424             : 
     425             :   // Bitconvert to a vector of twice the length with elements of the expanded
     426             :   // type, insert the expanded vector elements, and then convert back.
     427          30 :   EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewEVT, NumElts*2);
     428          30 :   SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
     429          60 :                                NewVecVT, N->getOperand(0));
     430             : 
     431          30 :   SDValue Lo, Hi;
     432          30 :   GetExpandedOp(Val, Lo, Hi);
     433          60 :   if (DAG.getDataLayout().isBigEndian())
     434             :     std::swap(Lo, Hi);
     435             : 
     436          30 :   SDValue Idx = N->getOperand(2);
     437          60 :   Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
     438          60 :   NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Lo, Idx);
     439          60 :   Idx = DAG.getNode(ISD::ADD, dl,
     440             :                     Idx.getValueType(), Idx,
     441          60 :                     DAG.getConstant(1, dl, Idx.getValueType()));
     442          60 :   NewVec =  DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Hi, Idx);
     443             : 
     444             :   // Convert the new vector to the old vector type.
     445          90 :   return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
     446             : }
     447             : 
     448          62 : SDValue DAGTypeLegalizer::ExpandOp_SCALAR_TO_VECTOR(SDNode *N) {
     449             :   SDLoc dl(N);
     450         124 :   EVT VT = N->getValueType(0);
     451             :   assert(VT.getVectorElementType() == N->getOperand(0).getValueType() &&
     452             :          "SCALAR_TO_VECTOR operand type doesn't match vector element type!");
     453          62 :   unsigned NumElts = VT.getVectorNumElements();
     454         124 :   SmallVector<SDValue, 16> Ops(NumElts);
     455         124 :   Ops[0] = N->getOperand(0);
     456         124 :   SDValue UndefVal = DAG.getUNDEF(Ops[0].getValueType());
     457         278 :   for (unsigned i = 1; i < NumElts; ++i)
     458         216 :     Ops[i] = UndefVal;
     459         186 :   return DAG.getBuildVector(VT, dl, Ops);
     460             : }
     461             : 
     462       70394 : SDValue DAGTypeLegalizer::ExpandOp_NormalStore(SDNode *N, unsigned OpNo) {
     463             :   assert(ISD::isNormalStore(N) && "This routine only for normal stores!");
     464             :   assert(OpNo == 1 && "Can only expand the stored value so far");
     465             :   SDLoc dl(N);
     466             : 
     467             :   StoreSDNode *St = cast<StoreSDNode>(N);
     468       70394 :   EVT ValueVT = St->getValue().getValueType();
     469      140788 :   EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), ValueVT);
     470       70394 :   SDValue Chain = St->getChain();
     471       70394 :   SDValue Ptr = St->getBasePtr();
     472       70394 :   unsigned Alignment = St->getAlignment();
     473       70394 :   AAMDNodes AAInfo = St->getAAInfo();
     474             : 
     475             :   assert(NVT.isByteSized() && "Expanded type not byte sized!");
     476       70394 :   unsigned IncrementSize = NVT.getSizeInBits() / 8;
     477             : 
     478       70394 :   SDValue Lo, Hi;
     479       70394 :   GetExpandedOp(St->getValue(), Lo, Hi);
     480             : 
     481       70394 :   if (TLI.hasBigEndianPartOrdering(ValueVT, DAG.getDataLayout()))
     482             :     std::swap(Lo, Hi);
     483             : 
     484      140788 :   Lo = DAG.getStore(Chain, dl, Lo, Ptr, St->getPointerInfo(), Alignment,
     485       70394 :                     St->getMemOperand()->getFlags(), AAInfo);
     486             : 
     487       70394 :   Ptr = DAG.getObjectPtrOffset(dl, Ptr, IncrementSize);
     488      140788 :   Hi = DAG.getStore(Chain, dl, Hi, Ptr,
     489             :                     St->getPointerInfo().getWithOffset(IncrementSize),
     490       70394 :                     MinAlign(Alignment, IncrementSize),
     491      211182 :                     St->getMemOperand()->getFlags(), AAInfo);
     492             : 
     493      211182 :   return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
     494             : }
     495             : 
     496             : 
     497             : //===--------------------------------------------------------------------===//
     498             : // Generic Result Splitting.
     499             : //===--------------------------------------------------------------------===//
     500             : 
     501             : // Be careful to make no assumptions about which of Lo/Hi is stored first in
     502             : // memory (for vectors it is always Lo first followed by Hi in the following
     503             : // bytes; for integers and floats it is Lo first if and only if the machine is
     504             : // little-endian).
     505             : 
     506          53 : void DAGTypeLegalizer::SplitRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
     507             :                                              SDValue &Lo, SDValue &Hi) {
     508          53 :   SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
     509          53 :   GetSplitOp(Op, Lo, Hi);
     510          53 : }
     511             : 
     512          23 : static std::pair<SDValue, SDValue> SplitVSETCC(const SDNode *N,
     513             :                                                SelectionDAG &DAG) {
     514             :   SDLoc DL(N);
     515             :   EVT LoVT, HiVT;
     516          69 :   std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(N->getValueType(0));
     517             : 
     518             :   // Split the inputs.
     519             :   SDValue Lo, Hi, LL, LH, RL, RH;
     520          46 :   std::tie(LL, LH) = DAG.SplitVectorOperand(N, 0);
     521          46 :   std::tie(RL, RH) = DAG.SplitVectorOperand(N, 1);
     522             : 
     523          69 :   Lo = DAG.getNode(N->getOpcode(), DL, LoVT, LL, RL, N->getOperand(2));
     524          69 :   Hi = DAG.getNode(N->getOpcode(), DL, HiVT, LH, RH, N->getOperand(2));
     525             : 
     526          23 :   return std::make_pair(Lo, Hi);
     527             : }
     528             : 
     529        1666 : void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo, SDValue &Hi) {
     530        1666 :   SDValue LL, LH, RL, RH, CL, CH;
     531             :   SDLoc dl(N);
     532        3332 :   GetSplitOp(N->getOperand(1), LL, LH);
     533        3332 :   GetSplitOp(N->getOperand(2), RL, RH);
     534             : 
     535        1666 :   SDValue Cond = N->getOperand(0);
     536        1666 :   CL = CH = Cond;
     537        4998 :   if (Cond.getValueType().isVector()) {
     538         923 :     if (SDValue Res = WidenVSELECTAndMask(N))
     539         930 :       std::tie(CL, CH) = DAG.SplitVector(Res->getOperand(0), dl);
     540             :     // It seems to improve code to generate two narrow SETCCs as opposed to
     541             :     // splitting a wide result vector.
     542        1226 :     else if (Cond.getOpcode() == ISD::SETCC)
     543          46 :       std::tie(CL, CH) = SplitVSETCC(Cond.getNode(), DAG);
     544             :     // Check if there are already splitted versions of the vector available and
     545             :     // use those instead of splitting the mask operand again.
     546        1770 :     else if (getTypeAction(Cond.getValueType()) ==
     547             :              TargetLowering::TypeSplitVector)
     548         540 :       GetSplitVector(Cond, CL, CH);
     549             :     else
     550         100 :       std::tie(CL, CH) = DAG.SplitVector(Cond, dl);
     551             :   }
     552             : 
     553        6664 :   Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), CL, LL, RL);
     554        6664 :   Hi = DAG.getNode(N->getOpcode(), dl, LH.getValueType(), CH, LH, RH);
     555        1666 : }
     556             : 
     557         627 : void DAGTypeLegalizer::SplitRes_SELECT_CC(SDNode *N, SDValue &Lo,
     558             :                                           SDValue &Hi) {
     559         627 :   SDValue LL, LH, RL, RH;
     560             :   SDLoc dl(N);
     561        1254 :   GetSplitOp(N->getOperand(2), LL, LH);
     562        1254 :   GetSplitOp(N->getOperand(3), RL, RH);
     563             : 
     564        1254 :   Lo = DAG.getNode(ISD::SELECT_CC, dl, LL.getValueType(), N->getOperand(0),
     565        1254 :                    N->getOperand(1), LL, RL, N->getOperand(4));
     566        1254 :   Hi = DAG.getNode(ISD::SELECT_CC, dl, LH.getValueType(), N->getOperand(0),
     567        1254 :                    N->getOperand(1), LH, RH, N->getOperand(4));
     568         627 : }
     569             : 
     570        3570 : void DAGTypeLegalizer::SplitRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi) {
     571             :   EVT LoVT, HiVT;
     572       10710 :   std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(N->getValueType(0));
     573        3570 :   Lo = DAG.getUNDEF(LoVT);
     574        3570 :   Hi = DAG.getUNDEF(HiVT);
     575        3570 : }

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