lib/CodeGen/SelectionDAG/LegalizeTypes.h

   1 //===-- LegalizeTypes.h - DAG Type Legalizer class definition ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file defines the DAGTypeLegalizer class.  This is a private interface
  10 // shared between the code that implements the SelectionDAG::LegalizeTypes
  11 // method.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_LIB_CODEGEN_SELECTIONDAG_LEGALIZETYPES_H
  16 #define LLVM_LIB_CODEGEN_SELECTIONDAG_LEGALIZETYPES_H
  17
  18 #include "llvm/ADT/DenseMap.h"
  19 #include "llvm/CodeGen/SelectionDAG.h"
  20 #include "llvm/CodeGen/TargetLowering.h"
  21 #include "llvm/Support/Compiler.h"
  22 #include "llvm/Support/Debug.h"
  23
  24 namespace llvm {
  25
  26 //===----------------------------------------------------------------------===//
  27 /// This takes an arbitrary SelectionDAG as input and hacks on it until only
  28 /// value types the target machine can handle are left. This involves promoting
  29 /// small sizes to large sizes or splitting up large values into small values.
  30 ///
  31 class LLVM_LIBRARY_VISIBILITY DAGTypeLegalizer {
  32   const TargetLowering &TLI;
  33   SelectionDAG &DAG;
  34 public:
  35   /// This pass uses the NodeId on the SDNodes to hold information about the
  36   /// state of the node. The enum has all the values.
  37   enum NodeIdFlags {
  38     /// All operands have been processed, so this node is ready to be handled.
  39     ReadyToProcess = 0,
  40
  41     /// This is a new node, not before seen, that was created in the process of
  42     /// legalizing some other node.
  43     NewNode = -1,
  44
  45     /// This node's ID needs to be set to the number of its unprocessed
  46     /// operands.
  47     Unanalyzed = -2,
  48
  49     /// This is a node that has already been processed.
  50     Processed = -3
  51
  52     // 1+ - This is a node which has this many unprocessed operands.
  53   };
  54 private:
  55
  56   /// This is a bitvector that contains two bits for each simple value type,
  57   /// where the two bits correspond to the LegalizeAction enum from
  58   /// TargetLowering. This can be queried with "getTypeAction(VT)".
  59   TargetLowering::ValueTypeActionImpl ValueTypeActions;
  60
  61   /// Return how we should legalize values of this type.
  62   TargetLowering::LegalizeTypeAction getTypeAction(EVT VT) const {
  63     return TLI.getTypeAction(*DAG.getContext(), VT);
  64   }
  65
  66   /// Return true if this type is legal on this target.
  67   bool isTypeLegal(EVT VT) const {
  68     return TLI.getTypeAction(*DAG.getContext(), VT) == TargetLowering::TypeLegal;
  69   }
  70
  71   /// Return true if this is a simple legal type.
  72   bool isSimpleLegalType(EVT VT) const {
  73     return VT.isSimple() && TLI.isTypeLegal(VT);
  74   }
  75
  76   EVT getSetCCResultType(EVT VT) const {
  77     return TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT);
  78   }
  79
  80   /// Pretend all of this node's results are legal.
  81   bool IgnoreNodeResults(SDNode *N) const {
  82     return N->getOpcode() == ISD::TargetConstant ||
  83            N->getOpcode() == ISD::Register;
  84   }
  85
  86   // Bijection from SDValue to unique id. As each created node gets a
  87   // new id we do not need to worry about reuse expunging.  Should we
  88   // run out of ids, we can do a one time expensive compactifcation.
  89   typedef unsigned TableId;
  90
  91   TableId NextValueId = 1;
  92
  93   SmallDenseMap<SDValue, TableId, 8> ValueToIdMap;
  94   SmallDenseMap<TableId, SDValue, 8> IdToValueMap;
  95
  96   /// For integer nodes that are below legal width, this map indicates what
  97   /// promoted value to use.
  98   SmallDenseMap<TableId, TableId, 8> PromotedIntegers;
  99
 100   /// For integer nodes that need to be expanded this map indicates which
 101   /// operands are the expanded version of the input.
 102   SmallDenseMap<TableId, std::pair<TableId, TableId>, 8> ExpandedIntegers;
 103
 104   /// For floating-point nodes converted to integers of the same size, this map
 105   /// indicates the converted value to use.
 106   SmallDenseMap<TableId, TableId, 8> SoftenedFloats;
 107
 108   /// For floating-point nodes that have a smaller precision than the smallest
 109   /// supported precision, this map indicates what promoted value to use.
 110   SmallDenseMap<TableId, TableId, 8> PromotedFloats;
 111
 112   /// For float nodes that need to be expanded this map indicates which operands
 113   /// are the expanded version of the input.
 114   SmallDenseMap<TableId, std::pair<TableId, TableId>, 8> ExpandedFloats;
 115
 116   /// For nodes that are <1 x ty>, this map indicates the scalar value of type
 117   /// 'ty' to use.
 118   SmallDenseMap<TableId, TableId, 8> ScalarizedVectors;
 119
 120   /// For nodes that need to be split this map indicates which operands are the
 121   /// expanded version of the input.
 122   SmallDenseMap<TableId, std::pair<TableId, TableId>, 8> SplitVectors;
 123
 124   /// For vector nodes that need to be widened, indicates the widened value to
 125   /// use.
 126   SmallDenseMap<TableId, TableId, 8> WidenedVectors;
 127
 128   /// For values that have been replaced with another, indicates the replacement
 129   /// value to use.
 130   SmallDenseMap<TableId, TableId, 8> ReplacedValues;
 131
 132   /// This defines a worklist of nodes to process. In order to be pushed onto
 133   /// this worklist, all operands of a node must have already been processed.
 134   SmallVector<SDNode*, 128> Worklist;
 135
 136   TableId getTableId(SDValue V) {
 137     assert(V.getNode() && "Getting TableId on SDValue()");
 138
 139     auto I = ValueToIdMap.find(V);
 140     if (I != ValueToIdMap.end()) {
 141       // replace if there's been a shift.
 142       RemapId(I->second);
 143       assert(I->second && "All Ids should be nonzero");
 144       return I->second;
 145     }
 146     // Add if it's not there.
 147     ValueToIdMap.insert(std::make_pair(V, NextValueId));
 148     IdToValueMap.insert(std::make_pair(NextValueId, V));
 149     ++NextValueId;
 150     assert(NextValueId != 0 &&
 151            "Ran out of Ids. Increase id type size or add compactification");
 152     return NextValueId - 1;
 153   }
 154
 155   const SDValue &getSDValue(TableId &Id) {
 156     RemapId(Id);
 157     assert(Id && "TableId should be non-zero");
 158     return IdToValueMap[Id];
 159   }
 160
 161 public:
 162   explicit DAGTypeLegalizer(SelectionDAG &dag)
 163     : TLI(dag.getTargetLoweringInfo()), DAG(dag),
 164     ValueTypeActions(TLI.getValueTypeActions()) {
 165     static_assert(MVT::LAST_VALUETYPE <= MVT::MAX_ALLOWED_VALUETYPE,
 166                   "Too many value types for ValueTypeActions to hold!");
 167   }
 168
 169   /// This is the main entry point for the type legalizer.  This does a
 170   /// top-down traversal of the dag, legalizing types as it goes.  Returns
 171   /// "true" if it made any changes.
 172   bool run();
 173
 174   void NoteDeletion(SDNode *Old, SDNode *New) {
 175     for (unsigned i = 0, e = Old->getNumValues(); i != e; ++i) {
 176       TableId NewId = getTableId(SDValue(New, i));
 177       TableId OldId = getTableId(SDValue(Old, i));
 178
 179       if (OldId != NewId)
 180         ReplacedValues[OldId] = NewId;
 181
 182       // Delete Node from tables.
 183       ValueToIdMap.erase(SDValue(Old, i));
 184       IdToValueMap.erase(OldId);
 185       PromotedIntegers.erase(OldId);
 186       ExpandedIntegers.erase(OldId);
 187       SoftenedFloats.erase(OldId);
 188       PromotedFloats.erase(OldId);
 189       ExpandedFloats.erase(OldId);
 190       ScalarizedVectors.erase(OldId);
 191       SplitVectors.erase(OldId);
 192       WidenedVectors.erase(OldId);
 193     }
 194   }
 195
 196   SelectionDAG &getDAG() const { return DAG; }
 197
 198 private:
 199   SDNode *AnalyzeNewNode(SDNode *N);
 200   void AnalyzeNewValue(SDValue &Val);
 201   void PerformExpensiveChecks();
 202   void RemapId(TableId &Id);
 203   void RemapValue(SDValue &V);
 204
 205   // Common routines.
 206   SDValue BitConvertToInteger(SDValue Op);
 207   SDValue BitConvertVectorToIntegerVector(SDValue Op);
 208   SDValue CreateStackStoreLoad(SDValue Op, EVT DestVT);
 209   bool CustomLowerNode(SDNode *N, EVT VT, bool LegalizeResult);
 210   bool CustomWidenLowerNode(SDNode *N, EVT VT);
 211
 212   /// Replace each result of the given MERGE_VALUES node with the corresponding
 213   /// input operand, except for the result 'ResNo', for which the corresponding
 214   /// input operand is returned.
 215   SDValue DisintegrateMERGE_VALUES(SDNode *N, unsigned ResNo);
 216
 217   SDValue JoinIntegers(SDValue Lo, SDValue Hi);
 218   SDValue LibCallify(RTLIB::Libcall LC, SDNode *N, bool isSigned);
 219
 220   std::pair<SDValue, SDValue> ExpandChainLibCall(RTLIB::Libcall LC,
 221                                                  SDNode *Node, bool isSigned);
 222   std::pair<SDValue, SDValue> ExpandAtomic(SDNode *Node);
 223
 224   SDValue PromoteTargetBoolean(SDValue Bool, EVT ValVT);
 225
 226   void ReplaceValueWith(SDValue From, SDValue To);
 227   void SplitInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 228   void SplitInteger(SDValue Op, EVT LoVT, EVT HiVT,
 229                     SDValue &Lo, SDValue &Hi);
 230
 231   void AddToWorklist(SDNode *N) {
 232     N->setNodeId(ReadyToProcess);
 233     Worklist.push_back(N);
 234   }
 235
 236   //===--------------------------------------------------------------------===//
 237   // Integer Promotion Support: LegalizeIntegerTypes.cpp
 238   //===--------------------------------------------------------------------===//
 239
 240   /// Given a processed operand Op which was promoted to a larger integer type,
 241   /// this returns the promoted value. The low bits of the promoted value
 242   /// corresponding to the original type are exactly equal to Op.
 243   /// The extra bits contain rubbish, so the promoted value may need to be zero-
 244   /// or sign-extended from the original type before it is usable (the helpers
 245   /// SExtPromotedInteger and ZExtPromotedInteger can do this for you).
 246   /// For example, if Op is an i16 and was promoted to an i32, then this method
 247   /// returns an i32, the lower 16 bits of which coincide with Op, and the upper
 248   /// 16 bits of which contain rubbish.
 249   SDValue GetPromotedInteger(SDValue Op) {
 250     TableId &PromotedId = PromotedIntegers[getTableId(Op)];
 251     SDValue PromotedOp = getSDValue(PromotedId);
 252     assert(PromotedOp.getNode() && "Operand wasn't promoted?");
 253     return PromotedOp;
 254   }
 255   void SetPromotedInteger(SDValue Op, SDValue Result);
 256
 257   /// Get a promoted operand and sign extend it to the final size.
 258   SDValue SExtPromotedInteger(SDValue Op) {
 259     EVT OldVT = Op.getValueType();
 260     SDLoc dl(Op);
 261     Op = GetPromotedInteger(Op);
 262     return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(), Op,
 263                        DAG.getValueType(OldVT));
 264   }
 265
 266   /// Get a promoted operand and zero extend it to the final size.
 267   SDValue ZExtPromotedInteger(SDValue Op) {
 268     EVT OldVT = Op.getValueType();
 269     SDLoc dl(Op);
 270     Op = GetPromotedInteger(Op);
 271     return DAG.getZeroExtendInReg(Op, dl, OldVT.getScalarType());
 272   }
 273
 274   // Get a promoted operand and sign or zero extend it to the final size
 275   // (depending on TargetLoweringInfo::isSExtCheaperThanZExt). For a given
 276   // subtarget and type, the choice of sign or zero-extension will be
 277   // consistent.
 278   SDValue SExtOrZExtPromotedInteger(SDValue Op) {
 279     EVT OldVT = Op.getValueType();
 280     SDLoc DL(Op);
 281     Op = GetPromotedInteger(Op);
 282     if (TLI.isSExtCheaperThanZExt(OldVT, Op.getValueType()))
 283       return DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, Op.getValueType(), Op,
 284                          DAG.getValueType(OldVT));
 285     return DAG.getZeroExtendInReg(Op, DL, OldVT.getScalarType());
 286   }
 287
 288   // Integer Result Promotion.
 289   void PromoteIntegerResult(SDNode *N, unsigned ResNo);
 290   SDValue PromoteIntRes_MERGE_VALUES(SDNode *N, unsigned ResNo);
 291   SDValue PromoteIntRes_AssertSext(SDNode *N);
 292   SDValue PromoteIntRes_AssertZext(SDNode *N);
 293   SDValue PromoteIntRes_Atomic0(AtomicSDNode *N);
 294   SDValue PromoteIntRes_Atomic1(AtomicSDNode *N);
 295   SDValue PromoteIntRes_AtomicCmpSwap(AtomicSDNode *N, unsigned ResNo);
 296   SDValue PromoteIntRes_EXTRACT_SUBVECTOR(SDNode *N);
 297   SDValue PromoteIntRes_VECTOR_SHUFFLE(SDNode *N);
 298   SDValue PromoteIntRes_BUILD_VECTOR(SDNode *N);
 299   SDValue PromoteIntRes_SCALAR_TO_VECTOR(SDNode *N);
 300   SDValue PromoteIntRes_EXTEND_VECTOR_INREG(SDNode *N);
 301   SDValue PromoteIntRes_INSERT_VECTOR_ELT(SDNode *N);
 302   SDValue PromoteIntRes_CONCAT_VECTORS(SDNode *N);
 303   SDValue PromoteIntRes_BITCAST(SDNode *N);
 304   SDValue PromoteIntRes_BSWAP(SDNode *N);
 305   SDValue PromoteIntRes_BITREVERSE(SDNode *N);
 306   SDValue PromoteIntRes_BUILD_PAIR(SDNode *N);
 307   SDValue PromoteIntRes_Constant(SDNode *N);
 308   SDValue PromoteIntRes_CTLZ(SDNode *N);
 309   SDValue PromoteIntRes_CTPOP(SDNode *N);
 310   SDValue PromoteIntRes_CTTZ(SDNode *N);
 311   SDValue PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N);
 312   SDValue PromoteIntRes_FP_TO_XINT(SDNode *N);
 313   SDValue PromoteIntRes_FP_TO_FP16(SDNode *N);
 314   SDValue PromoteIntRes_INT_EXTEND(SDNode *N);
 315   SDValue PromoteIntRes_LOAD(LoadSDNode *N);
 316   SDValue PromoteIntRes_MLOAD(MaskedLoadSDNode *N);
 317   SDValue PromoteIntRes_MGATHER(MaskedGatherSDNode *N);
 318   SDValue PromoteIntRes_Overflow(SDNode *N);
 319   SDValue PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo);
 320   SDValue PromoteIntRes_SELECT(SDNode *N);
 321   SDValue PromoteIntRes_VSELECT(SDNode *N);
 322   SDValue PromoteIntRes_SELECT_CC(SDNode *N);
 323   SDValue PromoteIntRes_SETCC(SDNode *N);
 324   SDValue PromoteIntRes_SHL(SDNode *N);
 325   SDValue PromoteIntRes_SimpleIntBinOp(SDNode *N);
 326   SDValue PromoteIntRes_ZExtIntBinOp(SDNode *N);
 327   SDValue PromoteIntRes_SExtIntBinOp(SDNode *N);
 328   SDValue PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N);
 329   SDValue PromoteIntRes_SRA(SDNode *N);
 330   SDValue PromoteIntRes_SRL(SDNode *N);
 331   SDValue PromoteIntRes_TRUNCATE(SDNode *N);
 332   SDValue PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo);
 333   SDValue PromoteIntRes_ADDSUBCARRY(SDNode *N, unsigned ResNo);
 334   SDValue PromoteIntRes_UNDEF(SDNode *N);
 335   SDValue PromoteIntRes_VAARG(SDNode *N);
 336   SDValue PromoteIntRes_XMULO(SDNode *N, unsigned ResNo);
 337   SDValue PromoteIntRes_ADDSUBSAT(SDNode *N);
 338   SDValue PromoteIntRes_MULFIX(SDNode *N);
 339   SDValue PromoteIntRes_FLT_ROUNDS(SDNode *N);
 340   SDValue PromoteIntRes_VECREDUCE(SDNode *N);
 341   SDValue PromoteIntRes_ABS(SDNode *N);
 342
 343   // Integer Operand Promotion.
 344   bool PromoteIntegerOperand(SDNode *N, unsigned OpNo);
 345   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
 346   SDValue PromoteIntOp_ATOMIC_STORE(AtomicSDNode *N);
 347   SDValue PromoteIntOp_BITCAST(SDNode *N);
 348   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
 349   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
 350   SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);
 351   SDValue PromoteIntOp_BUILD_VECTOR(SDNode *N);
 352   SDValue PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N, unsigned OpNo);
 353   SDValue PromoteIntOp_EXTRACT_VECTOR_ELT(SDNode *N);
 354   SDValue PromoteIntOp_EXTRACT_SUBVECTOR(SDNode *N);
 355   SDValue PromoteIntOp_CONCAT_VECTORS(SDNode *N);
 356   SDValue PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N);
 357   SDValue PromoteIntOp_SELECT(SDNode *N, unsigned OpNo);
 358   SDValue PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo);
 359   SDValue PromoteIntOp_SETCC(SDNode *N, unsigned OpNo);
 360   SDValue PromoteIntOp_Shift(SDNode *N);
 361   SDValue PromoteIntOp_SIGN_EXTEND(SDNode *N);
 362   SDValue PromoteIntOp_SINT_TO_FP(SDNode *N);
 363   SDValue PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 364   SDValue PromoteIntOp_TRUNCATE(SDNode *N);
 365   SDValue PromoteIntOp_UINT_TO_FP(SDNode *N);
 366   SDValue PromoteIntOp_ZERO_EXTEND(SDNode *N);
 367   SDValue PromoteIntOp_MSTORE(MaskedStoreSDNode *N, unsigned OpNo);
 368   SDValue PromoteIntOp_MLOAD(MaskedLoadSDNode *N, unsigned OpNo);
 369   SDValue PromoteIntOp_MSCATTER(MaskedScatterSDNode *N, unsigned OpNo);
 370   SDValue PromoteIntOp_MGATHER(MaskedGatherSDNode *N, unsigned OpNo);
 371   SDValue PromoteIntOp_ADDSUBCARRY(SDNode *N, unsigned OpNo);
 372   SDValue PromoteIntOp_FRAMERETURNADDR(SDNode *N);
 373   SDValue PromoteIntOp_PREFETCH(SDNode *N, unsigned OpNo);
 374   SDValue PromoteIntOp_MULFIX(SDNode *N);
 375   SDValue PromoteIntOp_FPOWI(SDNode *N);
 376   SDValue PromoteIntOp_VECREDUCE(SDNode *N);
 377
 378   void PromoteSetCCOperands(SDValue &LHS,SDValue &RHS, ISD::CondCode Code);
 379
 380   //===--------------------------------------------------------------------===//
 381   // Integer Expansion Support: LegalizeIntegerTypes.cpp
 382   //===--------------------------------------------------------------------===//
 383
 384   /// Given a processed operand Op which was expanded into two integers of half
 385   /// the size, this returns the two halves. The low bits of Op are exactly
 386   /// equal to the bits of Lo; the high bits exactly equal Hi.
 387   /// For example, if Op is an i64 which was expanded into two i32's, then this
 388   /// method returns the two i32's, with Lo being equal to the lower 32 bits of
 389   /// Op, and Hi being equal to the upper 32 bits.
 390   void GetExpandedInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 391   void SetExpandedInteger(SDValue Op, SDValue Lo, SDValue Hi);
 392
 393   // Integer Result Expansion.
 394   void ExpandIntegerResult(SDNode *N, unsigned ResNo);
 395   void ExpandIntRes_ANY_EXTEND        (SDNode *N, SDValue &Lo, SDValue &Hi);
 396   void ExpandIntRes_AssertSext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 397   void ExpandIntRes_AssertZext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 398   void ExpandIntRes_Constant          (SDNode *N, SDValue &Lo, SDValue &Hi);
 399   void ExpandIntRes_ABS               (SDNode *N, SDValue &Lo, SDValue &Hi);
 400   void ExpandIntRes_CTLZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 401   void ExpandIntRes_CTPOP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 402   void ExpandIntRes_CTTZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 403   void ExpandIntRes_LOAD          (LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 404   void ExpandIntRes_READCYCLECOUNTER  (SDNode *N, SDValue &Lo, SDValue &Hi);
 405   void ExpandIntRes_SIGN_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 406   void ExpandIntRes_SIGN_EXTEND_INREG (SDNode *N, SDValue &Lo, SDValue &Hi);
 407   void ExpandIntRes_TRUNCATE          (SDNode *N, SDValue &Lo, SDValue &Hi);
 408   void ExpandIntRes_ZERO_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 409   void ExpandIntRes_FLT_ROUNDS        (SDNode *N, SDValue &Lo, SDValue &Hi);
 410   void ExpandIntRes_FP_TO_SINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 411   void ExpandIntRes_FP_TO_UINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 412   void ExpandIntRes_LLROUND           (SDNode *N, SDValue &Lo, SDValue &Hi);
 413   void ExpandIntRes_LLRINT            (SDNode *N, SDValue &Lo, SDValue &Hi);
 414
 415   void ExpandIntRes_Logical           (SDNode *N, SDValue &Lo, SDValue &Hi);
 416   void ExpandIntRes_ADDSUB            (SDNode *N, SDValue &Lo, SDValue &Hi);
 417   void ExpandIntRes_ADDSUBC           (SDNode *N, SDValue &Lo, SDValue &Hi);
 418   void ExpandIntRes_ADDSUBE           (SDNode *N, SDValue &Lo, SDValue &Hi);
 419   void ExpandIntRes_ADDSUBCARRY       (SDNode *N, SDValue &Lo, SDValue &Hi);
 420   void ExpandIntRes_BITREVERSE        (SDNode *N, SDValue &Lo, SDValue &Hi);
 421   void ExpandIntRes_BSWAP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 422   void ExpandIntRes_MUL               (SDNode *N, SDValue &Lo, SDValue &Hi);
 423   void ExpandIntRes_SDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 424   void ExpandIntRes_SREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 425   void ExpandIntRes_UDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 426   void ExpandIntRes_UREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 427   void ExpandIntRes_Shift             (SDNode *N, SDValue &Lo, SDValue &Hi);
 428
 429   void ExpandIntRes_MINMAX            (SDNode *N, SDValue &Lo, SDValue &Hi);
 430
 431   void ExpandIntRes_SADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);
 432   void ExpandIntRes_UADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);
 433   void ExpandIntRes_XMULO             (SDNode *N, SDValue &Lo, SDValue &Hi);
 434   void ExpandIntRes_ADDSUBSAT         (SDNode *N, SDValue &Lo, SDValue &Hi);
 435   void ExpandIntRes_MULFIX            (SDNode *N, SDValue &Lo, SDValue &Hi);
 436
 437   void ExpandIntRes_ATOMIC_LOAD       (SDNode *N, SDValue &Lo, SDValue &Hi);
 438   void ExpandIntRes_VECREDUCE         (SDNode *N, SDValue &Lo, SDValue &Hi);
 439
 440   void ExpandShiftByConstant(SDNode *N, const APInt &Amt,
 441                              SDValue &Lo, SDValue &Hi);
 442   bool ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 443   bool ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 444
 445   // Integer Operand Expansion.
 446   bool ExpandIntegerOperand(SDNode *N, unsigned OpNo);
 447   SDValue ExpandIntOp_BR_CC(SDNode *N);
 448   SDValue ExpandIntOp_SELECT_CC(SDNode *N);
 449   SDValue ExpandIntOp_SETCC(SDNode *N);
 450   SDValue ExpandIntOp_SETCCCARRY(SDNode *N);
 451   SDValue ExpandIntOp_Shift(SDNode *N);
 452   SDValue ExpandIntOp_SINT_TO_FP(SDNode *N);
 453   SDValue ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 454   SDValue ExpandIntOp_TRUNCATE(SDNode *N);
 455   SDValue ExpandIntOp_UINT_TO_FP(SDNode *N);
 456   SDValue ExpandIntOp_RETURNADDR(SDNode *N);
 457   SDValue ExpandIntOp_ATOMIC_STORE(SDNode *N);
 458
 459   void IntegerExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 460                                   ISD::CondCode &CCCode, const SDLoc &dl);
 461
 462   //===--------------------------------------------------------------------===//
 463   // Float to Integer Conversion Support: LegalizeFloatTypes.cpp
 464   //===--------------------------------------------------------------------===//
 465
 466   /// GetSoftenedFloat - Given a processed operand Op which was converted to an
 467   /// integer of the same size, this returns the integer.  The integer contains
 468   /// exactly the same bits as Op - only the type changed.  For example, if Op
 469   /// is an f32 which was softened to an i32, then this method returns an i32,
 470   /// the bits of which coincide with those of Op
 471   SDValue GetSoftenedFloat(SDValue Op) {
 472     TableId Id = getTableId(Op);
 473     auto Iter = SoftenedFloats.find(Id);
 474     if (Iter == SoftenedFloats.end()) {
 475       assert(isSimpleLegalType(Op.getValueType()) &&
 476              "Operand wasn't converted to integer?");
 477       return Op;
 478     }
 479     SDValue SoftenedOp = getSDValue(Iter->second);
 480     assert(SoftenedOp.getNode() && "Unconverted op in SoftenedFloats?");
 481     return SoftenedOp;
 482   }
 483   void SetSoftenedFloat(SDValue Op, SDValue Result);
 484
 485   // Convert Float Results to Integer.
 486   void SoftenFloatResult(SDNode *N, unsigned ResNo);
 487   SDValue SoftenFloatRes_MERGE_VALUES(SDNode *N, unsigned ResNo);
 488   SDValue SoftenFloatRes_BITCAST(SDNode *N);
 489   SDValue SoftenFloatRes_BUILD_PAIR(SDNode *N);
 490   SDValue SoftenFloatRes_ConstantFP(SDNode *N);
 491   SDValue SoftenFloatRes_EXTRACT_VECTOR_ELT(SDNode *N, unsigned ResNo);
 492   SDValue SoftenFloatRes_FABS(SDNode *N);
 493   SDValue SoftenFloatRes_FMINNUM(SDNode *N);
 494   SDValue SoftenFloatRes_FMAXNUM(SDNode *N);
 495   SDValue SoftenFloatRes_FADD(SDNode *N);
 496   SDValue SoftenFloatRes_FCEIL(SDNode *N);
 497   SDValue SoftenFloatRes_FCOPYSIGN(SDNode *N);
 498   SDValue SoftenFloatRes_FCOS(SDNode *N);
 499   SDValue SoftenFloatRes_FDIV(SDNode *N);
 500   SDValue SoftenFloatRes_FEXP(SDNode *N);
 501   SDValue SoftenFloatRes_FEXP2(SDNode *N);
 502   SDValue SoftenFloatRes_FFLOOR(SDNode *N);
 503   SDValue SoftenFloatRes_FLOG(SDNode *N);
 504   SDValue SoftenFloatRes_FLOG2(SDNode *N);
 505   SDValue SoftenFloatRes_FLOG10(SDNode *N);
 506   SDValue SoftenFloatRes_FMA(SDNode *N);
 507   SDValue SoftenFloatRes_FMUL(SDNode *N);
 508   SDValue SoftenFloatRes_FNEARBYINT(SDNode *N);
 509   SDValue SoftenFloatRes_FNEG(SDNode *N);
 510   SDValue SoftenFloatRes_FP_EXTEND(SDNode *N);
 511   SDValue SoftenFloatRes_FP16_TO_FP(SDNode *N);
 512   SDValue SoftenFloatRes_FP_ROUND(SDNode *N);
 513   SDValue SoftenFloatRes_FPOW(SDNode *N);
 514   SDValue SoftenFloatRes_FPOWI(SDNode *N);
 515   SDValue SoftenFloatRes_FREM(SDNode *N);
 516   SDValue SoftenFloatRes_FRINT(SDNode *N);
 517   SDValue SoftenFloatRes_FROUND(SDNode *N);
 518   SDValue SoftenFloatRes_FSIN(SDNode *N);
 519   SDValue SoftenFloatRes_FSQRT(SDNode *N);
 520   SDValue SoftenFloatRes_FSUB(SDNode *N);
 521   SDValue SoftenFloatRes_FTRUNC(SDNode *N);
 522   SDValue SoftenFloatRes_LOAD(SDNode *N);
 523   SDValue SoftenFloatRes_SELECT(SDNode *N);
 524   SDValue SoftenFloatRes_SELECT_CC(SDNode *N);
 525   SDValue SoftenFloatRes_UNDEF(SDNode *N);
 526   SDValue SoftenFloatRes_VAARG(SDNode *N);
 527   SDValue SoftenFloatRes_XINT_TO_FP(SDNode *N);
 528
 529   // Convert Float Operand to Integer.
 530   bool SoftenFloatOperand(SDNode *N, unsigned OpNo);
 531   SDValue SoftenFloatOp_BITCAST(SDNode *N);
 532   SDValue SoftenFloatOp_BR_CC(SDNode *N);
 533   SDValue SoftenFloatOp_FP_EXTEND(SDNode *N);
 534   SDValue SoftenFloatOp_FP_ROUND(SDNode *N);
 535   SDValue SoftenFloatOp_FP_TO_XINT(SDNode *N);
 536   SDValue SoftenFloatOp_LROUND(SDNode *N);
 537   SDValue SoftenFloatOp_LLROUND(SDNode *N);
 538   SDValue SoftenFloatOp_LRINT(SDNode *N);
 539   SDValue SoftenFloatOp_LLRINT(SDNode *N);
 540   SDValue SoftenFloatOp_SELECT_CC(SDNode *N);
 541   SDValue SoftenFloatOp_SETCC(SDNode *N);
 542   SDValue SoftenFloatOp_STORE(SDNode *N, unsigned OpNo);
 543
 544   //===--------------------------------------------------------------------===//
 545   // Float Expansion Support: LegalizeFloatTypes.cpp
 546   //===--------------------------------------------------------------------===//
 547
 548   /// Given a processed operand Op which was expanded into two floating-point
 549   /// values of half the size, this returns the two halves.
 550   /// The low bits of Op are exactly equal to the bits of Lo; the high bits
 551   /// exactly equal Hi.  For example, if Op is a ppcf128 which was expanded
 552   /// into two f64's, then this method returns the two f64's, with Lo being
 553   /// equal to the lower 64 bits of Op, and Hi to the upper 64 bits.
 554   void GetExpandedFloat(SDValue Op, SDValue &Lo, SDValue &Hi);
 555   void SetExpandedFloat(SDValue Op, SDValue Lo, SDValue Hi);
 556
 557   // Float Result Expansion.
 558   void ExpandFloatResult(SDNode *N, unsigned ResNo);
 559   void ExpandFloatRes_ConstantFP(SDNode *N, SDValue &Lo, SDValue &Hi);
 560   void ExpandFloatRes_FABS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 561   void ExpandFloatRes_FMINNUM   (SDNode *N, SDValue &Lo, SDValue &Hi);
 562   void ExpandFloatRes_FMAXNUM   (SDNode *N, SDValue &Lo, SDValue &Hi);
 563   void ExpandFloatRes_FADD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 564   void ExpandFloatRes_FCEIL     (SDNode *N, SDValue &Lo, SDValue &Hi);
 565   void ExpandFloatRes_FCOPYSIGN (SDNode *N, SDValue &Lo, SDValue &Hi);
 566   void ExpandFloatRes_FCOS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 567   void ExpandFloatRes_FDIV      (SDNode *N, SDValue &Lo, SDValue &Hi);
 568   void ExpandFloatRes_FEXP      (SDNode *N, SDValue &Lo, SDValue &Hi);
 569   void ExpandFloatRes_FEXP2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 570   void ExpandFloatRes_FFLOOR    (SDNode *N, SDValue &Lo, SDValue &Hi);
 571   void ExpandFloatRes_FLOG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 572   void ExpandFloatRes_FLOG2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 573   void ExpandFloatRes_FLOG10    (SDNode *N, SDValue &Lo, SDValue &Hi);
 574   void ExpandFloatRes_FMA       (SDNode *N, SDValue &Lo, SDValue &Hi);
 575   void ExpandFloatRes_FMUL      (SDNode *N, SDValue &Lo, SDValue &Hi);
 576   void ExpandFloatRes_FNEARBYINT(SDNode *N, SDValue &Lo, SDValue &Hi);
 577   void ExpandFloatRes_FNEG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 578   void ExpandFloatRes_FP_EXTEND (SDNode *N, SDValue &Lo, SDValue &Hi);
 579   void ExpandFloatRes_FPOW      (SDNode *N, SDValue &Lo, SDValue &Hi);
 580   void ExpandFloatRes_FPOWI     (SDNode *N, SDValue &Lo, SDValue &Hi);
 581   void ExpandFloatRes_FREM      (SDNode *N, SDValue &Lo, SDValue &Hi);
 582   void ExpandFloatRes_FRINT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 583   void ExpandFloatRes_FROUND    (SDNode *N, SDValue &Lo, SDValue &Hi);
 584   void ExpandFloatRes_FSIN      (SDNode *N, SDValue &Lo, SDValue &Hi);
 585   void ExpandFloatRes_FSQRT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 586   void ExpandFloatRes_FSUB      (SDNode *N, SDValue &Lo, SDValue &Hi);
 587   void ExpandFloatRes_FTRUNC    (SDNode *N, SDValue &Lo, SDValue &Hi);
 588   void ExpandFloatRes_LOAD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 589   void ExpandFloatRes_XINT_TO_FP(SDNode *N, SDValue &Lo, SDValue &Hi);
 590
 591   // Float Operand Expansion.
 592   bool ExpandFloatOperand(SDNode *N, unsigned OpNo);
 593   SDValue ExpandFloatOp_BR_CC(SDNode *N);
 594   SDValue ExpandFloatOp_FCOPYSIGN(SDNode *N);
 595   SDValue ExpandFloatOp_FP_ROUND(SDNode *N);
 596   SDValue ExpandFloatOp_FP_TO_SINT(SDNode *N);
 597   SDValue ExpandFloatOp_FP_TO_UINT(SDNode *N);
 598   SDValue ExpandFloatOp_LROUND(SDNode *N);
 599   SDValue ExpandFloatOp_LLROUND(SDNode *N);
 600   SDValue ExpandFloatOp_LRINT(SDNode *N);
 601   SDValue ExpandFloatOp_LLRINT(SDNode *N);
 602   SDValue ExpandFloatOp_SELECT_CC(SDNode *N);
 603   SDValue ExpandFloatOp_SETCC(SDNode *N);
 604   SDValue ExpandFloatOp_STORE(SDNode *N, unsigned OpNo);
 605
 606   void FloatExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 607                                 ISD::CondCode &CCCode, const SDLoc &dl);
 608
 609   //===--------------------------------------------------------------------===//
 610   // Float promotion support: LegalizeFloatTypes.cpp
 611   //===--------------------------------------------------------------------===//
 612
 613   SDValue GetPromotedFloat(SDValue Op) {
 614     TableId &PromotedId = PromotedFloats[getTableId(Op)];
 615     SDValue PromotedOp = getSDValue(PromotedId);
 616     assert(PromotedOp.getNode() && "Operand wasn't promoted?");
 617     return PromotedOp;
 618   }
 619   void SetPromotedFloat(SDValue Op, SDValue Result);
 620
 621   void PromoteFloatResult(SDNode *N, unsigned ResNo);
 622   SDValue PromoteFloatRes_BITCAST(SDNode *N);
 623   SDValue PromoteFloatRes_BinOp(SDNode *N);
 624   SDValue PromoteFloatRes_ConstantFP(SDNode *N);
 625   SDValue PromoteFloatRes_EXTRACT_VECTOR_ELT(SDNode *N);
 626   SDValue PromoteFloatRes_FCOPYSIGN(SDNode *N);
 627   SDValue PromoteFloatRes_FMAD(SDNode *N);
 628   SDValue PromoteFloatRes_FPOWI(SDNode *N);
 629   SDValue PromoteFloatRes_FP_ROUND(SDNode *N);
 630   SDValue PromoteFloatRes_LOAD(SDNode *N);
 631   SDValue PromoteFloatRes_SELECT(SDNode *N);
 632   SDValue PromoteFloatRes_SELECT_CC(SDNode *N);
 633   SDValue PromoteFloatRes_UnaryOp(SDNode *N);
 634   SDValue PromoteFloatRes_UNDEF(SDNode *N);
 635   SDValue BitcastToInt_ATOMIC_SWAP(SDNode *N);
 636   SDValue PromoteFloatRes_XINT_TO_FP(SDNode *N);
 637
 638   bool PromoteFloatOperand(SDNode *N, unsigned OpNo);
 639   SDValue PromoteFloatOp_BITCAST(SDNode *N, unsigned OpNo);
 640   SDValue PromoteFloatOp_FCOPYSIGN(SDNode *N, unsigned OpNo);
 641   SDValue PromoteFloatOp_FP_EXTEND(SDNode *N, unsigned OpNo);
 642   SDValue PromoteFloatOp_FP_TO_XINT(SDNode *N, unsigned OpNo);
 643   SDValue PromoteFloatOp_STORE(SDNode *N, unsigned OpNo);
 644   SDValue PromoteFloatOp_SELECT_CC(SDNode *N, unsigned OpNo);
 645   SDValue PromoteFloatOp_SETCC(SDNode *N, unsigned OpNo);
 646
 647   //===--------------------------------------------------------------------===//
 648   // Scalarization Support: LegalizeVectorTypes.cpp
 649   //===--------------------------------------------------------------------===//
 650
 651   /// Given a processed one-element vector Op which was scalarized to its
 652   /// element type, this returns the element. For example, if Op is a v1i32,
 653   /// Op = < i32 val >, this method returns val, an i32.
 654   SDValue GetScalarizedVector(SDValue Op) {
 655     TableId &ScalarizedId = ScalarizedVectors[getTableId(Op)];
 656     SDValue ScalarizedOp = getSDValue(ScalarizedId);
 657     assert(ScalarizedOp.getNode() && "Operand wasn't scalarized?");
 658     return ScalarizedOp;
 659   }
 660   void SetScalarizedVector(SDValue Op, SDValue Result);
 661
 662   // Vector Result Scalarization: <1 x ty> -> ty.
 663   void ScalarizeVectorResult(SDNode *N, unsigned ResNo);
 664   SDValue ScalarizeVecRes_MERGE_VALUES(SDNode *N, unsigned ResNo);
 665   SDValue ScalarizeVecRes_BinOp(SDNode *N);
 666   SDValue ScalarizeVecRes_TernaryOp(SDNode *N);
 667   SDValue ScalarizeVecRes_UnaryOp(SDNode *N);
 668   SDValue ScalarizeVecRes_StrictFPOp(SDNode *N);
 669   SDValue ScalarizeVecRes_OverflowOp(SDNode *N, unsigned ResNo);
 670   SDValue ScalarizeVecRes_InregOp(SDNode *N);
 671   SDValue ScalarizeVecRes_VecInregOp(SDNode *N);
 672
 673   SDValue ScalarizeVecRes_BITCAST(SDNode *N);
 674   SDValue ScalarizeVecRes_BUILD_VECTOR(SDNode *N);
 675   SDValue ScalarizeVecRes_EXTRACT_SUBVECTOR(SDNode *N);
 676   SDValue ScalarizeVecRes_FP_ROUND(SDNode *N);
 677   SDValue ScalarizeVecRes_STRICT_FP_ROUND(SDNode *N);
 678   SDValue ScalarizeVecRes_FPOWI(SDNode *N);
 679   SDValue ScalarizeVecRes_INSERT_VECTOR_ELT(SDNode *N);
 680   SDValue ScalarizeVecRes_LOAD(LoadSDNode *N);
 681   SDValue ScalarizeVecRes_SCALAR_TO_VECTOR(SDNode *N);
 682   SDValue ScalarizeVecRes_VSELECT(SDNode *N);
 683   SDValue ScalarizeVecRes_SELECT(SDNode *N);
 684   SDValue ScalarizeVecRes_SELECT_CC(SDNode *N);
 685   SDValue ScalarizeVecRes_SETCC(SDNode *N);
 686   SDValue ScalarizeVecRes_UNDEF(SDNode *N);
 687   SDValue ScalarizeVecRes_VECTOR_SHUFFLE(SDNode *N);
 688
 689   SDValue ScalarizeVecRes_MULFIX(SDNode *N);
 690
 691   // Vector Operand Scalarization: <1 x ty> -> ty.
 692   bool ScalarizeVectorOperand(SDNode *N, unsigned OpNo);
 693   SDValue ScalarizeVecOp_BITCAST(SDNode *N);
 694   SDValue ScalarizeVecOp_UnaryOp(SDNode *N);
 695   SDValue ScalarizeVecOp_UnaryOp_StrictFP(SDNode *N);
 696   SDValue ScalarizeVecOp_CONCAT_VECTORS(SDNode *N);
 697   SDValue ScalarizeVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 698   SDValue ScalarizeVecOp_VSELECT(SDNode *N);
 699   SDValue ScalarizeVecOp_VSETCC(SDNode *N);
 700   SDValue ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 701   SDValue ScalarizeVecOp_FP_ROUND(SDNode *N, unsigned OpNo);
 702   SDValue ScalarizeVecOp_STRICT_FP_ROUND(SDNode *N, unsigned OpNo);
 703   SDValue ScalarizeVecOp_VECREDUCE(SDNode *N);
 704
 705   //===--------------------------------------------------------------------===//
 706   // Vector Splitting Support: LegalizeVectorTypes.cpp
 707   //===--------------------------------------------------------------------===//
 708
 709   /// Given a processed vector Op which was split into vectors of half the size,
 710   /// this method returns the halves. The first elements of Op coincide with the
 711   /// elements of Lo; the remaining elements of Op coincide with the elements of
 712   /// Hi: Op is what you would get by concatenating Lo and Hi.
 713   /// For example, if Op is a v8i32 that was split into two v4i32's, then this
 714   /// method returns the two v4i32's, with Lo corresponding to the first 4
 715   /// elements of Op, and Hi to the last 4 elements.
 716   void GetSplitVector(SDValue Op, SDValue &Lo, SDValue &Hi);
 717   void SetSplitVector(SDValue Op, SDValue Lo, SDValue Hi);
 718
 719   // Vector Result Splitting: <128 x ty> -> 2 x <64 x ty>.
 720   void SplitVectorResult(SDNode *N, unsigned ResNo);
 721   void SplitVecRes_BinOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 722   void SplitVecRes_TernaryOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 723   void SplitVecRes_UnaryOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 724   void SplitVecRes_ExtendOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 725   void SplitVecRes_InregOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 726   void SplitVecRes_ExtVecInRegOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 727   void SplitVecRes_StrictFPOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 728   void SplitVecRes_OverflowOp(SDNode *N, unsigned ResNo,
 729                               SDValue &Lo, SDValue &Hi);
 730
 731   void SplitVecRes_MULFIX(SDNode *N, SDValue &Lo, SDValue &Hi);
 732
 733   void SplitVecRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi);
 734   void SplitVecRes_BUILD_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 735   void SplitVecRes_CONCAT_VECTORS(SDNode *N, SDValue &Lo, SDValue &Hi);
 736   void SplitVecRes_EXTRACT_SUBVECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 737   void SplitVecRes_INSERT_SUBVECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 738   void SplitVecRes_FPOWI(SDNode *N, SDValue &Lo, SDValue &Hi);
 739   void SplitVecRes_FCOPYSIGN(SDNode *N, SDValue &Lo, SDValue &Hi);
 740   void SplitVecRes_INSERT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 741   void SplitVecRes_LOAD(LoadSDNode *LD, SDValue &Lo, SDValue &Hi);
 742   void SplitVecRes_MLOAD(MaskedLoadSDNode *MLD, SDValue &Lo, SDValue &Hi);
 743   void SplitVecRes_MGATHER(MaskedGatherSDNode *MGT, SDValue &Lo, SDValue &Hi);
 744   void SplitVecRes_SCALAR_TO_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 745   void SplitVecRes_SETCC(SDNode *N, SDValue &Lo, SDValue &Hi);
 746   void SplitVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N, SDValue &Lo,
 747                                   SDValue &Hi);
 748   void SplitVecRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi);
 749
 750   // Vector Operand Splitting: <128 x ty> -> 2 x <64 x ty>.
 751   bool SplitVectorOperand(SDNode *N, unsigned OpNo);
 752   SDValue SplitVecOp_VSELECT(SDNode *N, unsigned OpNo);
 753   SDValue SplitVecOp_VECREDUCE(SDNode *N, unsigned OpNo);
 754   SDValue SplitVecOp_UnaryOp(SDNode *N);
 755   SDValue SplitVecOp_TruncateHelper(SDNode *N);
 756
 757   SDValue SplitVecOp_BITCAST(SDNode *N);
 758   SDValue SplitVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 759   SDValue SplitVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 760   SDValue SplitVecOp_ExtVecInRegOp(SDNode *N);
 761   SDValue SplitVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 762   SDValue SplitVecOp_MSTORE(MaskedStoreSDNode *N, unsigned OpNo);
 763   SDValue SplitVecOp_MSCATTER(MaskedScatterSDNode *N, unsigned OpNo);
 764   SDValue SplitVecOp_MGATHER(MaskedGatherSDNode *MGT, unsigned OpNo);
 765   SDValue SplitVecOp_CONCAT_VECTORS(SDNode *N);
 766   SDValue SplitVecOp_VSETCC(SDNode *N);
 767   SDValue SplitVecOp_FP_ROUND(SDNode *N);
 768   SDValue SplitVecOp_FCOPYSIGN(SDNode *N);
 769
 770   //===--------------------------------------------------------------------===//
 771   // Vector Widening Support: LegalizeVectorTypes.cpp
 772   //===--------------------------------------------------------------------===//
 773
 774   /// Given a processed vector Op which was widened into a larger vector, this
 775   /// method returns the larger vector. The elements of the returned vector
 776   /// consist of the elements of Op followed by elements containing rubbish.
 777   /// For example, if Op is a v2i32 that was widened to a v4i32, then this
 778   /// method returns a v4i32 for which the first two elements are the same as
 779   /// those of Op, while the last two elements contain rubbish.
 780   SDValue GetWidenedVector(SDValue Op) {
 781     TableId &WidenedId = WidenedVectors[getTableId(Op)];
 782     SDValue WidenedOp = getSDValue(WidenedId);
 783     assert(WidenedOp.getNode() && "Operand wasn't widened?");
 784     return WidenedOp;
 785   }
 786   void SetWidenedVector(SDValue Op, SDValue Result);
 787
 788   // Widen Vector Result Promotion.
 789   void WidenVectorResult(SDNode *N, unsigned ResNo);
 790   SDValue WidenVecRes_MERGE_VALUES(SDNode* N, unsigned ResNo);
 791   SDValue WidenVecRes_BITCAST(SDNode* N);
 792   SDValue WidenVecRes_BUILD_VECTOR(SDNode* N);
 793   SDValue WidenVecRes_CONCAT_VECTORS(SDNode* N);
 794   SDValue WidenVecRes_EXTEND_VECTOR_INREG(SDNode* N);
 795   SDValue WidenVecRes_EXTRACT_SUBVECTOR(SDNode* N);
 796   SDValue WidenVecRes_INSERT_VECTOR_ELT(SDNode* N);
 797   SDValue WidenVecRes_LOAD(SDNode* N);
 798   SDValue WidenVecRes_MLOAD(MaskedLoadSDNode* N);
 799   SDValue WidenVecRes_MGATHER(MaskedGatherSDNode* N);
 800   SDValue WidenVecRes_SCALAR_TO_VECTOR(SDNode* N);
 801   SDValue WidenVecRes_SELECT(SDNode* N);
 802   SDValue WidenVSELECTAndMask(SDNode *N);
 803   SDValue WidenVecRes_SELECT_CC(SDNode* N);
 804   SDValue WidenVecRes_SETCC(SDNode* N);
 805   SDValue WidenVecRes_UNDEF(SDNode *N);
 806   SDValue WidenVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N);
 807
 808   SDValue WidenVecRes_Ternary(SDNode *N);
 809   SDValue WidenVecRes_Binary(SDNode *N);
 810   SDValue WidenVecRes_BinaryCanTrap(SDNode *N);
 811   SDValue WidenVecRes_BinaryWithExtraScalarOp(SDNode *N);
 812   SDValue WidenVecRes_StrictFP(SDNode *N);
 813   SDValue WidenVecRes_OverflowOp(SDNode *N, unsigned ResNo);
 814   SDValue WidenVecRes_Convert(SDNode *N);
 815   SDValue WidenVecRes_Convert_StrictFP(SDNode *N);
 816   SDValue WidenVecRes_FCOPYSIGN(SDNode *N);
 817   SDValue WidenVecRes_POWI(SDNode *N);
 818   SDValue WidenVecRes_Shift(SDNode *N);
 819   SDValue WidenVecRes_Unary(SDNode *N);
 820   SDValue WidenVecRes_InregOp(SDNode *N);
 821
 822   // Widen Vector Operand.
 823   bool WidenVectorOperand(SDNode *N, unsigned OpNo);
 824   SDValue WidenVecOp_BITCAST(SDNode *N);
 825   SDValue WidenVecOp_CONCAT_VECTORS(SDNode *N);
 826   SDValue WidenVecOp_EXTEND(SDNode *N);
 827   SDValue WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 828   SDValue WidenVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 829   SDValue WidenVecOp_STORE(SDNode* N);
 830   SDValue WidenVecOp_MSTORE(SDNode* N, unsigned OpNo);
 831   SDValue WidenVecOp_MGATHER(SDNode* N, unsigned OpNo);
 832   SDValue WidenVecOp_MSCATTER(SDNode* N, unsigned OpNo);
 833   SDValue WidenVecOp_SETCC(SDNode* N);
 834   SDValue WidenVecOp_VSELECT(SDNode *N);
 835
 836   SDValue WidenVecOp_Convert(SDNode *N);
 837   SDValue WidenVecOp_FCOPYSIGN(SDNode *N);
 838   SDValue WidenVecOp_VECREDUCE(SDNode *N);
 839
 840   /// Helper function to generate a set of operations to perform
 841   /// a vector operation for a wider type.
 842   ///
 843   SDValue UnrollVectorOp_StrictFP(SDNode *N, unsigned ResNE);
 844
 845   //===--------------------------------------------------------------------===//
 846   // Vector Widening Utilities Support: LegalizeVectorTypes.cpp
 847   //===--------------------------------------------------------------------===//
 848
 849   /// Helper function to generate a set of loads to load a vector with a
 850   /// resulting wider type. It takes:
 851   ///   LdChain: list of chains for the load to be generated.
 852   ///   Ld:      load to widen
 853   SDValue GenWidenVectorLoads(SmallVectorImpl<SDValue> &LdChain,
 854                               LoadSDNode *LD);
 855
 856   /// Helper function to generate a set of extension loads to load a vector with
 857   /// a resulting wider type. It takes:
 858   ///   LdChain: list of chains for the load to be generated.
 859   ///   Ld:      load to widen
 860   ///   ExtType: extension element type
 861   SDValue GenWidenVectorExtLoads(SmallVectorImpl<SDValue> &LdChain,
 862                                  LoadSDNode *LD, ISD::LoadExtType ExtType);
 863
 864   /// Helper function to generate a set of stores to store a widen vector into
 865   /// non-widen memory.
 866   ///   StChain: list of chains for the stores we have generated
 867   ///   ST:      store of a widen value
 868   void GenWidenVectorStores(SmallVectorImpl<SDValue> &StChain, StoreSDNode *ST);
 869
 870   /// Helper function to generate a set of stores to store a truncate widen
 871   /// vector into non-widen memory.
 872   ///   StChain: list of chains for the stores we have generated
 873   ///   ST:      store of a widen value
 874   void GenWidenVectorTruncStores(SmallVectorImpl<SDValue> &StChain,
 875                                  StoreSDNode *ST);
 876
 877   /// Modifies a vector input (widen or narrows) to a vector of NVT.  The
 878   /// input vector must have the same element type as NVT.
 879   /// When FillWithZeroes is "on" the vector will be widened with zeroes.
 880   /// By default, the vector will be widened with undefined values.
 881   SDValue ModifyToType(SDValue InOp, EVT NVT, bool FillWithZeroes = false);
 882
 883   /// Return a mask of vector type MaskVT to replace InMask. Also adjust
 884   /// MaskVT to ToMaskVT if needed with vector extension or truncation.
 885   SDValue convertMask(SDValue InMask, EVT MaskVT, EVT ToMaskVT);
 886
 887   //===--------------------------------------------------------------------===//
 888   // Generic Splitting: LegalizeTypesGeneric.cpp
 889   //===--------------------------------------------------------------------===//
 890
 891   // Legalization methods which only use that the illegal type is split into two
 892   // not necessarily identical types.  As such they can be used for splitting
 893   // vectors and expanding integers and floats.
 894
 895   void GetSplitOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 896     if (Op.getValueType().isVector())
 897       GetSplitVector(Op, Lo, Hi);
 898     else if (Op.getValueType().isInteger())
 899       GetExpandedInteger(Op, Lo, Hi);
 900     else
 901       GetExpandedFloat(Op, Lo, Hi);
 902   }
 903
 904   /// Use ISD::EXTRACT_ELEMENT nodes to extract the low and high parts of the
 905   /// given value.
 906   void GetPairElements(SDValue Pair, SDValue &Lo, SDValue &Hi);
 907
 908   // Generic Result Splitting.
 909   void SplitRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
 910                              SDValue &Lo, SDValue &Hi);
 911   void SplitRes_SELECT      (SDNode *N, SDValue &Lo, SDValue &Hi);
 912   void SplitRes_SELECT_CC   (SDNode *N, SDValue &Lo, SDValue &Hi);
 913   void SplitRes_UNDEF       (SDNode *N, SDValue &Lo, SDValue &Hi);
 914
 915   void SplitVSETCC(const SDNode *N);
 916
 917   //===--------------------------------------------------------------------===//
 918   // Generic Expansion: LegalizeTypesGeneric.cpp
 919   //===--------------------------------------------------------------------===//
 920
 921   // Legalization methods which only use that the illegal type is split into two
 922   // identical types of half the size, and that the Lo/Hi part is stored first
 923   // in memory on little/big-endian machines, followed by the Hi/Lo part.  As
 924   // such they can be used for expanding integers and floats.
 925
 926   void GetExpandedOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 927     if (Op.getValueType().isInteger())
 928       GetExpandedInteger(Op, Lo, Hi);
 929     else
 930       GetExpandedFloat(Op, Lo, Hi);
 931   }
 932
 933
 934   /// This function will split the integer \p Op into \p NumElements
 935   /// operations of type \p EltVT and store them in \p Ops.
 936   void IntegerToVector(SDValue Op, unsigned NumElements,
 937                        SmallVectorImpl<SDValue> &Ops, EVT EltVT);
 938
 939   // Generic Result Expansion.
 940   void ExpandRes_MERGE_VALUES      (SDNode *N, unsigned ResNo,
 941                                     SDValue &Lo, SDValue &Hi);
 942   void ExpandRes_BITCAST           (SDNode *N, SDValue &Lo, SDValue &Hi);
 943   void ExpandRes_BUILD_PAIR        (SDNode *N, SDValue &Lo, SDValue &Hi);
 944   void ExpandRes_EXTRACT_ELEMENT   (SDNode *N, SDValue &Lo, SDValue &Hi);
 945   void ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 946   void ExpandRes_NormalLoad        (SDNode *N, SDValue &Lo, SDValue &Hi);
 947   void ExpandRes_VAARG             (SDNode *N, SDValue &Lo, SDValue &Hi);
 948
 949   // Generic Operand Expansion.
 950   SDValue ExpandOp_BITCAST          (SDNode *N);
 951   SDValue ExpandOp_BUILD_VECTOR     (SDNode *N);
 952   SDValue ExpandOp_EXTRACT_ELEMENT  (SDNode *N);
 953   SDValue ExpandOp_INSERT_VECTOR_ELT(SDNode *N);
 954   SDValue ExpandOp_SCALAR_TO_VECTOR (SDNode *N);
 955   SDValue ExpandOp_NormalStore      (SDNode *N, unsigned OpNo);
 956 };
 957
 958 } // end namespace llvm.
 959
 960 #endif