lib/CodeGen/SelectionDAG/LegalizeTypes.h

   1 //===-- LegalizeTypes.h - Definition of the DAG Type Legalizer class ------===//
   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 defines the DAGTypeLegalizer class.  This is a private interface
  11 // shared between the code that implements the SelectionDAG::LegalizeTypes
  12 // method.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef SELECTIONDAG_LEGALIZETYPES_H
  17 #define SELECTIONDAG_LEGALIZETYPES_H
  18
  19 #define DEBUG_TYPE "legalize-types"
  20 #include "llvm/CodeGen/SelectionDAG.h"
  21 #include "llvm/Target/TargetLowering.h"
  22 #include "llvm/ADT/DenseMap.h"
  23 #include "llvm/ADT/DenseSet.h"
  24 #include "llvm/Support/Compiler.h"
  25 #include "llvm/Support/Debug.h"
  26
  27 namespace llvm {
  28
  29 //===----------------------------------------------------------------------===//
  30 /// DAGTypeLegalizer - This takes an arbitrary SelectionDAG as input and hacks
  31 /// on it until only value types the target machine can handle are left.  This
  32 /// involves promoting small sizes to large sizes or splitting up large values
  33 /// into small values.
  34 ///
  35 class LLVM_LIBRARY_VISIBILITY DAGTypeLegalizer {
  36   const TargetLowering &TLI;
  37   SelectionDAG &DAG;
  38 public:
  39   // NodeIdFlags - This pass uses the NodeId on the SDNodes to hold information
  40   // about the state of the node.  The enum has all the values.
  41   enum NodeIdFlags {
  42     /// ReadyToProcess - All operands have been processed, so this node is ready
  43     /// to be handled.
  44     ReadyToProcess = 0,
  45
  46     /// NewNode - This is a new node, not before seen, that was created in the
  47     /// process of legalizing some other node.
  48     NewNode = -1,
  49
  50     /// Unanalyzed - This node's ID needs to be set to the number of its
  51     /// unprocessed operands.
  52     Unanalyzed = -2,
  53
  54     /// Processed - This is a node that has already been processed.
  55     Processed = -3
  56
  57     // 1+ - This is a node which has this many unprocessed operands.
  58   };
  59 private:
  60
  61   /// ValueTypeActions - This is a bitvector that contains two bits for each
  62   /// simple value type, where the two bits correspond to the LegalizeAction
  63   /// enum from TargetLowering.  This can be queried with "getTypeAction(VT)".
  64   TargetLowering::ValueTypeActionImpl ValueTypeActions;
  65
  66   /// getTypeAction - Return how we should legalize values of this type.
  67   TargetLowering::LegalizeTypeAction getTypeAction(EVT VT) const {
  68     return TLI.getTypeAction(*DAG.getContext(), VT);
  69   }
  70
  71   /// isTypeLegal - Return true if this type is legal on this target.
  72   bool isTypeLegal(EVT VT) const {
  73     return TLI.getTypeAction(*DAG.getContext(), VT) == TargetLowering::TypeLegal;
  74   }
  75
  76   /// IgnoreNodeResults - Pretend all of this node's results are legal.
  77   bool IgnoreNodeResults(SDNode *N) const {
  78     return N->getOpcode() == ISD::TargetConstant;
  79   }
  80
  81   /// PromotedIntegers - For integer nodes that are below legal width, this map
  82   /// indicates what promoted value to use.
  83   DenseMap<SDValue, SDValue> PromotedIntegers;
  84
  85   /// ExpandedIntegers - For integer nodes that need to be expanded this map
  86   /// indicates which operands are the expanded version of the input.
  87   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedIntegers;
  88
  89   /// SoftenedFloats - For floating point nodes converted to integers of
  90   /// the same size, this map indicates the converted value to use.
  91   DenseMap<SDValue, SDValue> SoftenedFloats;
  92
  93   /// ExpandedFloats - For float nodes that need to be expanded this map
  94   /// indicates which operands are the expanded version of the input.
  95   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedFloats;
  96
  97   /// ScalarizedVectors - For nodes that are <1 x ty>, this map indicates the
  98   /// scalar value of type 'ty' to use.
  99   DenseMap<SDValue, SDValue> ScalarizedVectors;
 100
 101   /// SplitVectors - For nodes that need to be split this map indicates
 102   /// which operands are the expanded version of the input.
 103   DenseMap<SDValue, std::pair<SDValue, SDValue> > SplitVectors;
 104
 105   /// WidenedVectors - For vector nodes that need to be widened, indicates
 106   /// the widened value to use.
 107   DenseMap<SDValue, SDValue> WidenedVectors;
 108
 109   /// ReplacedValues - For values that have been replaced with another,
 110   /// indicates the replacement value to use.
 111   DenseMap<SDValue, SDValue> ReplacedValues;
 112
 113   /// Worklist - This defines a worklist of nodes to process.  In order to be
 114   /// pushed onto this worklist, all operands of a node must have already been
 115   /// processed.
 116   SmallVector<SDNode*, 128> Worklist;
 117
 118 public:
 119   explicit DAGTypeLegalizer(SelectionDAG &dag)
 120     : TLI(dag.getTargetLoweringInfo()), DAG(dag),
 121     ValueTypeActions(TLI.getValueTypeActions()) {
 122     assert(MVT::LAST_VALUETYPE <= MVT::MAX_ALLOWED_VALUETYPE &&
 123            "Too many value types for ValueTypeActions to hold!");
 124   }
 125
 126   /// run - This is the main entry point for the type legalizer.  This does a
 127   /// top-down traversal of the dag, legalizing types as it goes.  Returns
 128   /// "true" if it made any changes.
 129   bool run();
 130
 131   void NoteDeletion(SDNode *Old, SDNode *New) {
 132     ExpungeNode(Old);
 133     ExpungeNode(New);
 134     for (unsigned i = 0, e = Old->getNumValues(); i != e; ++i)
 135       ReplacedValues[SDValue(Old, i)] = SDValue(New, i);
 136   }
 137
 138 private:
 139   SDNode *AnalyzeNewNode(SDNode *N);
 140   void AnalyzeNewValue(SDValue &Val);
 141   void ExpungeNode(SDNode *N);
 142   void PerformExpensiveChecks();
 143   void RemapValue(SDValue &N);
 144
 145   // Common routines.
 146   SDValue BitConvertToInteger(SDValue Op);
 147   SDValue BitConvertVectorToIntegerVector(SDValue Op);
 148   SDValue CreateStackStoreLoad(SDValue Op, EVT DestVT);
 149   bool CustomLowerNode(SDNode *N, EVT VT, bool LegalizeResult);
 150   bool CustomWidenLowerNode(SDNode *N, EVT VT);
 151   SDValue GetVectorElementPointer(SDValue VecPtr, EVT EltVT, SDValue Index);
 152   SDValue JoinIntegers(SDValue Lo, SDValue Hi);
 153   SDValue LibCallify(RTLIB::Libcall LC, SDNode *N, bool isSigned);
 154   SDValue MakeLibCall(RTLIB::Libcall LC, EVT RetVT,
 155                       const SDValue *Ops, unsigned NumOps, bool isSigned,
 156                       DebugLoc dl);
 157         std::pair<SDValue, SDValue> ExpandChainLibCall(RTLIB::Libcall LC,
 158                                                                                                        SDNode *Node, bool isSigned);
 159         std::pair<SDValue, SDValue> ExpandAtomic(SDNode *Node);
 160
 161   SDValue PromoteTargetBoolean(SDValue Bool, EVT VT);
 162   void ReplaceValueWith(SDValue From, SDValue To);
 163   void SplitInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 164   void SplitInteger(SDValue Op, EVT LoVT, EVT HiVT,
 165                     SDValue &Lo, SDValue &Hi);
 166
 167   //===--------------------------------------------------------------------===//
 168   // Integer Promotion Support: LegalizeIntegerTypes.cpp
 169   //===--------------------------------------------------------------------===//
 170
 171   /// GetPromotedInteger - Given a processed operand Op which was promoted to a
 172   /// larger integer type, this returns the promoted value.  The low bits of the
 173   /// promoted value corresponding to the original type are exactly equal to Op.
 174   /// The extra bits contain rubbish, so the promoted value may need to be zero-
 175   /// or sign-extended from the original type before it is usable (the helpers
 176   /// SExtPromotedInteger and ZExtPromotedInteger can do this for you).
 177   /// For example, if Op is an i16 and was promoted to an i32, then this method
 178   /// returns an i32, the lower 16 bits of which coincide with Op, and the upper
 179   /// 16 bits of which contain rubbish.
 180   SDValue GetPromotedInteger(SDValue Op) {
 181     SDValue &PromotedOp = PromotedIntegers[Op];
 182     RemapValue(PromotedOp);
 183     assert(PromotedOp.getNode() && "Operand wasn't promoted?");
 184     return PromotedOp;
 185   }
 186   void SetPromotedInteger(SDValue Op, SDValue Result);
 187
 188   /// SExtPromotedInteger - Get a promoted operand and sign extend it to the
 189   /// final size.
 190   SDValue SExtPromotedInteger(SDValue Op) {
 191     EVT OldVT = Op.getValueType();
 192     DebugLoc dl = Op.getDebugLoc();
 193     Op = GetPromotedInteger(Op);
 194     return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(), Op,
 195                        DAG.getValueType(OldVT));
 196   }
 197
 198   /// ZExtPromotedInteger - Get a promoted operand and zero extend it to the
 199   /// final size.
 200   SDValue ZExtPromotedInteger(SDValue Op) {
 201     EVT OldVT = Op.getValueType();
 202     DebugLoc dl = Op.getDebugLoc();
 203     Op = GetPromotedInteger(Op);
 204     return DAG.getZeroExtendInReg(Op, dl, OldVT.getScalarType());
 205   }
 206
 207   // Integer Result Promotion.
 208   void PromoteIntegerResult(SDNode *N, unsigned ResNo);
 209   SDValue PromoteIntRes_AssertSext(SDNode *N);
 210   SDValue PromoteIntRes_AssertZext(SDNode *N);
 211   SDValue PromoteIntRes_Atomic1(AtomicSDNode *N);
 212   SDValue PromoteIntRes_Atomic2(AtomicSDNode *N);
 213   SDValue PromoteIntRes_EXTRACT_SUBVECTOR(SDNode *N);
 214   SDValue PromoteIntRes_VECTOR_SHUFFLE(SDNode *N);
 215   SDValue PromoteIntRes_BUILD_VECTOR(SDNode *N);
 216   SDValue PromoteIntRes_SCALAR_TO_VECTOR(SDNode *N);
 217   SDValue PromoteIntRes_INSERT_VECTOR_ELT(SDNode *N);
 218   SDValue PromoteIntRes_BITCAST(SDNode *N);
 219   SDValue PromoteIntRes_BSWAP(SDNode *N);
 220   SDValue PromoteIntRes_BUILD_PAIR(SDNode *N);
 221   SDValue PromoteIntRes_Constant(SDNode *N);
 222   SDValue PromoteIntRes_CONVERT_RNDSAT(SDNode *N);
 223   SDValue PromoteIntRes_CTLZ(SDNode *N);
 224   SDValue PromoteIntRes_CTPOP(SDNode *N);
 225   SDValue PromoteIntRes_CTTZ(SDNode *N);
 226   SDValue PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N);
 227   SDValue PromoteIntRes_FP_TO_XINT(SDNode *N);
 228   SDValue PromoteIntRes_FP32_TO_FP16(SDNode *N);
 229   SDValue PromoteIntRes_INT_EXTEND(SDNode *N);
 230   SDValue PromoteIntRes_LOAD(LoadSDNode *N);
 231   SDValue PromoteIntRes_Overflow(SDNode *N);
 232   SDValue PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo);
 233   SDValue PromoteIntRes_SDIV(SDNode *N);
 234   SDValue PromoteIntRes_SELECT(SDNode *N);
 235   SDValue PromoteIntRes_SELECT_CC(SDNode *N);
 236   SDValue PromoteIntRes_SETCC(SDNode *N);
 237   SDValue PromoteIntRes_SHL(SDNode *N);
 238   SDValue PromoteIntRes_SimpleIntBinOp(SDNode *N);
 239   SDValue PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N);
 240   SDValue PromoteIntRes_SRA(SDNode *N);
 241   SDValue PromoteIntRes_SRL(SDNode *N);
 242   SDValue PromoteIntRes_TRUNCATE(SDNode *N);
 243   SDValue PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo);
 244   SDValue PromoteIntRes_UDIV(SDNode *N);
 245   SDValue PromoteIntRes_UNDEF(SDNode *N);
 246   SDValue PromoteIntRes_VAARG(SDNode *N);
 247   SDValue PromoteIntRes_XMULO(SDNode *N, unsigned ResNo);
 248
 249   // Integer Operand Promotion.
 250   bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
 251   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
 252   SDValue PromoteIntOp_BITCAST(SDNode *N);
 253   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
 254   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
 255   SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);
 256   SDValue PromoteIntOp_BUILD_VECTOR(SDNode *N);
 257   SDValue PromoteIntOp_CONVERT_RNDSAT(SDNode *N);
 258   SDValue PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N, unsigned OpNo);
 259   SDValue PromoteIntOp_EXTRACT_ELEMENT(SDNode *N);
 260   SDValue PromoteIntOp_EXTRACT_VECTOR_ELT(SDNode *N);
 261   SDValue PromoteIntOp_CONCAT_VECTORS(SDNode *N);
 262   SDValue PromoteIntOp_MEMBARRIER(SDNode *N);
 263   SDValue PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N);
 264   SDValue PromoteIntOp_SELECT(SDNode *N, unsigned OpNo);
 265   SDValue PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo);
 266   SDValue PromoteIntOp_SETCC(SDNode *N, unsigned OpNo);
 267   SDValue PromoteIntOp_Shift(SDNode *N);
 268   SDValue PromoteIntOp_SIGN_EXTEND(SDNode *N);
 269   SDValue PromoteIntOp_SINT_TO_FP(SDNode *N);
 270   SDValue PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 271   SDValue PromoteIntOp_TRUNCATE(SDNode *N);
 272   SDValue PromoteIntOp_UINT_TO_FP(SDNode *N);
 273   SDValue PromoteIntOp_ZERO_EXTEND(SDNode *N);
 274
 275   void PromoteSetCCOperands(SDValue &LHS,SDValue &RHS, ISD::CondCode Code);
 276
 277   //===--------------------------------------------------------------------===//
 278   // Integer Expansion Support: LegalizeIntegerTypes.cpp
 279   //===--------------------------------------------------------------------===//
 280
 281   /// GetExpandedInteger - Given a processed operand Op which was expanded into
 282   /// two integers of half the size, this returns the two halves.  The low bits
 283   /// of Op are exactly equal to the bits of Lo; the high bits exactly equal Hi.
 284   /// For example, if Op is an i64 which was expanded into two i32's, then this
 285   /// method returns the two i32's, with Lo being equal to the lower 32 bits of
 286   /// Op, and Hi being equal to the upper 32 bits.
 287   void GetExpandedInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 288   void SetExpandedInteger(SDValue Op, SDValue Lo, SDValue Hi);
 289
 290   // Integer Result Expansion.
 291   void ExpandIntegerResult(SDNode *N, unsigned ResNo);
 292   void ExpandIntRes_ANY_EXTEND        (SDNode *N, SDValue &Lo, SDValue &Hi);
 293   void ExpandIntRes_AssertSext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 294   void ExpandIntRes_AssertZext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 295   void ExpandIntRes_Constant          (SDNode *N, SDValue &Lo, SDValue &Hi);
 296   void ExpandIntRes_CTLZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 297   void ExpandIntRes_CTPOP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 298   void ExpandIntRes_CTTZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 299   void ExpandIntRes_LOAD          (LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 300   void ExpandIntRes_SIGN_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 301   void ExpandIntRes_SIGN_EXTEND_INREG (SDNode *N, SDValue &Lo, SDValue &Hi);
 302   void ExpandIntRes_TRUNCATE          (SDNode *N, SDValue &Lo, SDValue &Hi);
 303   void ExpandIntRes_ZERO_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 304   void ExpandIntRes_FP_TO_SINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 305   void ExpandIntRes_FP_TO_UINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 306
 307   void ExpandIntRes_Logical           (SDNode *N, SDValue &Lo, SDValue &Hi);
 308   void ExpandIntRes_ADDSUB            (SDNode *N, SDValue &Lo, SDValue &Hi);
 309   void ExpandIntRes_ADDSUBC           (SDNode *N, SDValue &Lo, SDValue &Hi);
 310   void ExpandIntRes_ADDSUBE           (SDNode *N, SDValue &Lo, SDValue &Hi);
 311   void ExpandIntRes_BSWAP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 312   void ExpandIntRes_MUL               (SDNode *N, SDValue &Lo, SDValue &Hi);
 313   void ExpandIntRes_SDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 314   void ExpandIntRes_SREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 315   void ExpandIntRes_UDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 316   void ExpandIntRes_UREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 317   void ExpandIntRes_Shift             (SDNode *N, SDValue &Lo, SDValue &Hi);
 318
 319   void ExpandIntRes_SADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);
 320   void ExpandIntRes_UADDSUBO          (SDNode *N, SDValue &Lo, SDValue &Hi);
 321   void ExpandIntRes_XMULO             (SDNode *N, SDValue &Lo, SDValue &Hi);
 322
 323   void ExpandShiftByConstant(SDNode *N, unsigned Amt,
 324                              SDValue &Lo, SDValue &Hi);
 325   bool ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 326   bool ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 327
 328   // Integer Operand Expansion.
 329   bool ExpandIntegerOperand(SDNode *N, unsigned OperandNo);
 330   SDValue ExpandIntOp_BITCAST(SDNode *N);
 331   SDValue ExpandIntOp_BR_CC(SDNode *N);
 332   SDValue ExpandIntOp_BUILD_VECTOR(SDNode *N);
 333   SDValue ExpandIntOp_EXTRACT_ELEMENT(SDNode *N);
 334   SDValue ExpandIntOp_SELECT_CC(SDNode *N);
 335   SDValue ExpandIntOp_SETCC(SDNode *N);
 336   SDValue ExpandIntOp_Shift(SDNode *N);
 337   SDValue ExpandIntOp_SINT_TO_FP(SDNode *N);
 338   SDValue ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 339   SDValue ExpandIntOp_TRUNCATE(SDNode *N);
 340   SDValue ExpandIntOp_UINT_TO_FP(SDNode *N);
 341   SDValue ExpandIntOp_RETURNADDR(SDNode *N);
 342
 343   void IntegerExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 344                                   ISD::CondCode &CCCode, DebugLoc dl);
 345
 346   //===--------------------------------------------------------------------===//
 347   // Float to Integer Conversion Support: LegalizeFloatTypes.cpp
 348   //===--------------------------------------------------------------------===//
 349
 350   /// GetSoftenedFloat - Given a processed operand Op which was converted to an
 351   /// integer of the same size, this returns the integer.  The integer contains
 352   /// exactly the same bits as Op - only the type changed.  For example, if Op
 353   /// is an f32 which was softened to an i32, then this method returns an i32,
 354   /// the bits of which coincide with those of Op.
 355   SDValue GetSoftenedFloat(SDValue Op) {
 356     SDValue &SoftenedOp = SoftenedFloats[Op];
 357     RemapValue(SoftenedOp);
 358     assert(SoftenedOp.getNode() && "Operand wasn't converted to integer?");
 359     return SoftenedOp;
 360   }
 361   void SetSoftenedFloat(SDValue Op, SDValue Result);
 362
 363   // Result Float to Integer Conversion.
 364   void SoftenFloatResult(SDNode *N, unsigned OpNo);
 365   SDValue SoftenFloatRes_BITCAST(SDNode *N);
 366   SDValue SoftenFloatRes_BUILD_PAIR(SDNode *N);
 367   SDValue SoftenFloatRes_ConstantFP(ConstantFPSDNode *N);
 368   SDValue SoftenFloatRes_EXTRACT_VECTOR_ELT(SDNode *N);
 369   SDValue SoftenFloatRes_FABS(SDNode *N);
 370   SDValue SoftenFloatRes_FADD(SDNode *N);
 371   SDValue SoftenFloatRes_FCEIL(SDNode *N);
 372   SDValue SoftenFloatRes_FCOPYSIGN(SDNode *N);
 373   SDValue SoftenFloatRes_FCOS(SDNode *N);
 374   SDValue SoftenFloatRes_FDIV(SDNode *N);
 375   SDValue SoftenFloatRes_FEXP(SDNode *N);
 376   SDValue SoftenFloatRes_FEXP2(SDNode *N);
 377   SDValue SoftenFloatRes_FFLOOR(SDNode *N);
 378   SDValue SoftenFloatRes_FLOG(SDNode *N);
 379   SDValue SoftenFloatRes_FLOG2(SDNode *N);
 380   SDValue SoftenFloatRes_FLOG10(SDNode *N);
 381   SDValue SoftenFloatRes_FMA(SDNode *N);
 382   SDValue SoftenFloatRes_FMUL(SDNode *N);
 383   SDValue SoftenFloatRes_FNEARBYINT(SDNode *N);
 384   SDValue SoftenFloatRes_FNEG(SDNode *N);
 385   SDValue SoftenFloatRes_FP_EXTEND(SDNode *N);
 386   SDValue SoftenFloatRes_FP16_TO_FP32(SDNode *N);
 387   SDValue SoftenFloatRes_FP_ROUND(SDNode *N);
 388   SDValue SoftenFloatRes_FPOW(SDNode *N);
 389   SDValue SoftenFloatRes_FPOWI(SDNode *N);
 390   SDValue SoftenFloatRes_FREM(SDNode *N);
 391   SDValue SoftenFloatRes_FRINT(SDNode *N);
 392   SDValue SoftenFloatRes_FSIN(SDNode *N);
 393   SDValue SoftenFloatRes_FSQRT(SDNode *N);
 394   SDValue SoftenFloatRes_FSUB(SDNode *N);
 395   SDValue SoftenFloatRes_FTRUNC(SDNode *N);
 396   SDValue SoftenFloatRes_LOAD(SDNode *N);
 397   SDValue SoftenFloatRes_SELECT(SDNode *N);
 398   SDValue SoftenFloatRes_SELECT_CC(SDNode *N);
 399   SDValue SoftenFloatRes_UNDEF(SDNode *N);
 400   SDValue SoftenFloatRes_VAARG(SDNode *N);
 401   SDValue SoftenFloatRes_XINT_TO_FP(SDNode *N);
 402
 403   // Operand Float to Integer Conversion.
 404   bool SoftenFloatOperand(SDNode *N, unsigned OpNo);
 405   SDValue SoftenFloatOp_BITCAST(SDNode *N);
 406   SDValue SoftenFloatOp_BR_CC(SDNode *N);
 407   SDValue SoftenFloatOp_FP_ROUND(SDNode *N);
 408   SDValue SoftenFloatOp_FP_TO_SINT(SDNode *N);
 409   SDValue SoftenFloatOp_FP_TO_UINT(SDNode *N);
 410   SDValue SoftenFloatOp_FP32_TO_FP16(SDNode *N);
 411   SDValue SoftenFloatOp_SELECT_CC(SDNode *N);
 412   SDValue SoftenFloatOp_SETCC(SDNode *N);
 413   SDValue SoftenFloatOp_STORE(SDNode *N, unsigned OpNo);
 414
 415   void SoftenSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 416                            ISD::CondCode &CCCode, DebugLoc dl);
 417
 418   //===--------------------------------------------------------------------===//
 419   // Float Expansion Support: LegalizeFloatTypes.cpp
 420   //===--------------------------------------------------------------------===//
 421
 422   /// GetExpandedFloat - Given a processed operand Op which was expanded into
 423   /// two floating point values of half the size, this returns the two halves.
 424   /// The low bits of Op are exactly equal to the bits of Lo; the high bits
 425   /// exactly equal Hi.  For example, if Op is a ppcf128 which was expanded
 426   /// into two f64's, then this method returns the two f64's, with Lo being
 427   /// equal to the lower 64 bits of Op, and Hi to the upper 64 bits.
 428   void GetExpandedFloat(SDValue Op, SDValue &Lo, SDValue &Hi);
 429   void SetExpandedFloat(SDValue Op, SDValue Lo, SDValue Hi);
 430
 431   // Float Result Expansion.
 432   void ExpandFloatResult(SDNode *N, unsigned ResNo);
 433   void ExpandFloatRes_ConstantFP(SDNode *N, SDValue &Lo, SDValue &Hi);
 434   void ExpandFloatRes_FABS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 435   void ExpandFloatRes_FADD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 436   void ExpandFloatRes_FCEIL     (SDNode *N, SDValue &Lo, SDValue &Hi);
 437   void ExpandFloatRes_FCOPYSIGN (SDNode *N, SDValue &Lo, SDValue &Hi);
 438   void ExpandFloatRes_FCOS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 439   void ExpandFloatRes_FDIV      (SDNode *N, SDValue &Lo, SDValue &Hi);
 440   void ExpandFloatRes_FEXP      (SDNode *N, SDValue &Lo, SDValue &Hi);
 441   void ExpandFloatRes_FEXP2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 442   void ExpandFloatRes_FFLOOR    (SDNode *N, SDValue &Lo, SDValue &Hi);
 443   void ExpandFloatRes_FLOG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 444   void ExpandFloatRes_FLOG2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 445   void ExpandFloatRes_FLOG10    (SDNode *N, SDValue &Lo, SDValue &Hi);
 446   void ExpandFloatRes_FMA       (SDNode *N, SDValue &Lo, SDValue &Hi);
 447   void ExpandFloatRes_FMUL      (SDNode *N, SDValue &Lo, SDValue &Hi);
 448   void ExpandFloatRes_FNEARBYINT(SDNode *N, SDValue &Lo, SDValue &Hi);
 449   void ExpandFloatRes_FNEG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 450   void ExpandFloatRes_FP_EXTEND (SDNode *N, SDValue &Lo, SDValue &Hi);
 451   void ExpandFloatRes_FPOW      (SDNode *N, SDValue &Lo, SDValue &Hi);
 452   void ExpandFloatRes_FPOWI     (SDNode *N, SDValue &Lo, SDValue &Hi);
 453   void ExpandFloatRes_FRINT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 454   void ExpandFloatRes_FSIN      (SDNode *N, SDValue &Lo, SDValue &Hi);
 455   void ExpandFloatRes_FSQRT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 456   void ExpandFloatRes_FSUB      (SDNode *N, SDValue &Lo, SDValue &Hi);
 457   void ExpandFloatRes_FTRUNC    (SDNode *N, SDValue &Lo, SDValue &Hi);
 458   void ExpandFloatRes_LOAD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 459   void ExpandFloatRes_XINT_TO_FP(SDNode *N, SDValue &Lo, SDValue &Hi);
 460
 461   // Float Operand Expansion.
 462   bool ExpandFloatOperand(SDNode *N, unsigned OperandNo);
 463   SDValue ExpandFloatOp_BR_CC(SDNode *N);
 464   SDValue ExpandFloatOp_FP_ROUND(SDNode *N);
 465   SDValue ExpandFloatOp_FP_TO_SINT(SDNode *N);
 466   SDValue ExpandFloatOp_FP_TO_UINT(SDNode *N);
 467   SDValue ExpandFloatOp_SELECT_CC(SDNode *N);
 468   SDValue ExpandFloatOp_SETCC(SDNode *N);
 469   SDValue ExpandFloatOp_STORE(SDNode *N, unsigned OpNo);
 470
 471   void FloatExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 472                                 ISD::CondCode &CCCode, DebugLoc dl);
 473
 474   //===--------------------------------------------------------------------===//
 475   // Scalarization Support: LegalizeVectorTypes.cpp
 476   //===--------------------------------------------------------------------===//
 477
 478   /// GetScalarizedVector - Given a processed one-element vector Op which was
 479   /// scalarized to its element type, this returns the element.  For example,
 480   /// if Op is a v1i32, Op = < i32 val >, this method returns val, an i32.
 481   SDValue GetScalarizedVector(SDValue Op) {
 482     SDValue &ScalarizedOp = ScalarizedVectors[Op];
 483     RemapValue(ScalarizedOp);
 484     assert(ScalarizedOp.getNode() && "Operand wasn't scalarized?");
 485     return ScalarizedOp;
 486   }
 487   void SetScalarizedVector(SDValue Op, SDValue Result);
 488
 489   // Vector Result Scalarization: <1 x ty> -> ty.
 490   void ScalarizeVectorResult(SDNode *N, unsigned OpNo);
 491   SDValue ScalarizeVecRes_BinOp(SDNode *N);
 492   SDValue ScalarizeVecRes_UnaryOp(SDNode *N);
 493   SDValue ScalarizeVecRes_InregOp(SDNode *N);
 494
 495   SDValue ScalarizeVecRes_BITCAST(SDNode *N);
 496   SDValue ScalarizeVecRes_CONVERT_RNDSAT(SDNode *N);
 497   SDValue ScalarizeVecRes_EXTRACT_SUBVECTOR(SDNode *N);
 498   SDValue ScalarizeVecRes_FP_ROUND(SDNode *N);
 499   SDValue ScalarizeVecRes_FPOWI(SDNode *N);
 500   SDValue ScalarizeVecRes_INSERT_VECTOR_ELT(SDNode *N);
 501   SDValue ScalarizeVecRes_LOAD(LoadSDNode *N);
 502   SDValue ScalarizeVecRes_SCALAR_TO_VECTOR(SDNode *N);
 503   SDValue ScalarizeVecRes_SIGN_EXTEND_INREG(SDNode *N);
 504   SDValue ScalarizeVecRes_SELECT(SDNode *N);
 505   SDValue ScalarizeVecRes_SELECT_CC(SDNode *N);
 506   SDValue ScalarizeVecRes_SETCC(SDNode *N);
 507   SDValue ScalarizeVecRes_UNDEF(SDNode *N);
 508   SDValue ScalarizeVecRes_VECTOR_SHUFFLE(SDNode *N);
 509   SDValue ScalarizeVecRes_VSETCC(SDNode *N);
 510
 511   // Vector Operand Scalarization: <1 x ty> -> ty.
 512   bool ScalarizeVectorOperand(SDNode *N, unsigned OpNo);
 513   SDValue ScalarizeVecOp_BITCAST(SDNode *N);
 514   SDValue ScalarizeVecOp_CONCAT_VECTORS(SDNode *N);
 515   SDValue ScalarizeVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 516   SDValue ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 517
 518   //===--------------------------------------------------------------------===//
 519   // Vector Splitting Support: LegalizeVectorTypes.cpp
 520   //===--------------------------------------------------------------------===//
 521
 522   /// GetSplitVector - Given a processed vector Op which was split into vectors
 523   /// of half the size, this method returns the halves.  The first elements of
 524   /// Op coincide with the elements of Lo; the remaining elements of Op coincide
 525   /// with the elements of Hi: Op is what you would get by concatenating Lo and
 526   /// Hi.  For example, if Op is a v8i32 that was split into two v4i32's, then
 527   /// this method returns the two v4i32's, with Lo corresponding to the first 4
 528   /// elements of Op, and Hi to the last 4 elements.
 529   void GetSplitVector(SDValue Op, SDValue &Lo, SDValue &Hi);
 530   void SetSplitVector(SDValue Op, SDValue Lo, SDValue Hi);
 531
 532   // Vector Result Splitting: <128 x ty> -> 2 x <64 x ty>.
 533   void SplitVectorResult(SDNode *N, unsigned OpNo);
 534   void SplitVecRes_BinOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 535   void SplitVecRes_UnaryOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 536   void SplitVecRes_InregOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 537
 538   void SplitVecRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi);
 539   void SplitVecRes_BUILD_PAIR(SDNode *N, SDValue &Lo, SDValue &Hi);
 540   void SplitVecRes_BUILD_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 541   void SplitVecRes_CONCAT_VECTORS(SDNode *N, SDValue &Lo, SDValue &Hi);
 542   void SplitVecRes_EXTRACT_SUBVECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 543   void SplitVecRes_FPOWI(SDNode *N, SDValue &Lo, SDValue &Hi);
 544   void SplitVecRes_INSERT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 545   void SplitVecRes_LOAD(LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 546   void SplitVecRes_SCALAR_TO_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 547   void SplitVecRes_SIGN_EXTEND_INREG(SDNode *N, SDValue &Lo, SDValue &Hi);
 548   void SplitVecRes_SETCC(SDNode *N, SDValue &Lo, SDValue &Hi);
 549   void SplitVecRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi);
 550   void SplitVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N, SDValue &Lo,
 551                                   SDValue &Hi);
 552
 553   // Vector Operand Splitting: <128 x ty> -> 2 x <64 x ty>.
 554   bool SplitVectorOperand(SDNode *N, unsigned OpNo);
 555   SDValue SplitVecOp_UnaryOp(SDNode *N);
 556
 557   SDValue SplitVecOp_BITCAST(SDNode *N);
 558   SDValue SplitVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 559   SDValue SplitVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 560   SDValue SplitVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 561   SDValue SplitVecOp_CONCAT_VECTORS(SDNode *N);
 562   SDValue SplitVecOp_FP_ROUND(SDNode *N);
 563
 564   //===--------------------------------------------------------------------===//
 565   // Vector Widening Support: LegalizeVectorTypes.cpp
 566   //===--------------------------------------------------------------------===//
 567
 568   /// GetWidenedVector - Given a processed vector Op which was widened into a
 569   /// larger vector, this method returns the larger vector.  The elements of
 570   /// the returned vector consist of the elements of Op followed by elements
 571   /// containing rubbish.  For example, if Op is a v2i32 that was widened to a
 572   /// v4i32, then this method returns a v4i32 for which the first two elements
 573   /// are the same as those of Op, while the last two elements contain rubbish.
 574   SDValue GetWidenedVector(SDValue Op) {
 575     SDValue &WidenedOp = WidenedVectors[Op];
 576     RemapValue(WidenedOp);
 577     assert(WidenedOp.getNode() && "Operand wasn't widened?");
 578     return WidenedOp;
 579   }
 580   void SetWidenedVector(SDValue Op, SDValue Result);
 581
 582   // Widen Vector Result Promotion.
 583   void WidenVectorResult(SDNode *N, unsigned ResNo);
 584   SDValue WidenVecRes_BITCAST(SDNode* N);
 585   SDValue WidenVecRes_BUILD_VECTOR(SDNode* N);
 586   SDValue WidenVecRes_CONCAT_VECTORS(SDNode* N);
 587   SDValue WidenVecRes_CONVERT_RNDSAT(SDNode* N);
 588   SDValue WidenVecRes_EXTRACT_SUBVECTOR(SDNode* N);
 589   SDValue WidenVecRes_INSERT_VECTOR_ELT(SDNode* N);
 590   SDValue WidenVecRes_LOAD(SDNode* N);
 591   SDValue WidenVecRes_SCALAR_TO_VECTOR(SDNode* N);
 592   SDValue WidenVecRes_SIGN_EXTEND_INREG(SDNode* N);
 593   SDValue WidenVecRes_SELECT(SDNode* N);
 594   SDValue WidenVecRes_SELECT_CC(SDNode* N);
 595   SDValue WidenVecRes_SETCC(SDNode* N);
 596   SDValue WidenVecRes_UNDEF(SDNode *N);
 597   SDValue WidenVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N);
 598   SDValue WidenVecRes_VSETCC(SDNode* N);
 599
 600   SDValue WidenVecRes_Binary(SDNode *N);
 601   SDValue WidenVecRes_Convert(SDNode *N);
 602   SDValue WidenVecRes_POWI(SDNode *N);
 603   SDValue WidenVecRes_Shift(SDNode *N);
 604   SDValue WidenVecRes_Unary(SDNode *N);
 605   SDValue WidenVecRes_InregOp(SDNode *N);
 606
 607   // Widen Vector Operand.
 608   bool WidenVectorOperand(SDNode *N, unsigned ResNo);
 609   SDValue WidenVecOp_BITCAST(SDNode *N);
 610   SDValue WidenVecOp_CONCAT_VECTORS(SDNode *N);
 611   SDValue WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 612   SDValue WidenVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 613   SDValue WidenVecOp_STORE(SDNode* N);
 614
 615   SDValue WidenVecOp_Convert(SDNode *N);
 616
 617   //===--------------------------------------------------------------------===//
 618   // Vector Widening Utilities Support: LegalizeVectorTypes.cpp
 619   //===--------------------------------------------------------------------===//
 620
 621   /// Helper GenWidenVectorLoads - Helper function to generate a set of
 622   /// loads to load a vector with a resulting wider type. It takes
 623   ///   LdChain: list of chains for the load to be generated.
 624   ///   Ld:      load to widen
 625   SDValue GenWidenVectorLoads(SmallVector<SDValue, 16>& LdChain,
 626                               LoadSDNode *LD);
 627
 628   /// GenWidenVectorExtLoads - Helper function to generate a set of extension
 629   /// loads to load a ector with a resulting wider type.  It takes
 630   ///   LdChain: list of chains for the load to be generated.
 631   ///   Ld:      load to widen
 632   ///   ExtType: extension element type
 633   SDValue GenWidenVectorExtLoads(SmallVector<SDValue, 16>& LdChain,
 634                                  LoadSDNode *LD, ISD::LoadExtType ExtType);
 635
 636   /// Helper genWidenVectorStores - Helper function to generate a set of
 637   /// stores to store a widen vector into non widen memory
 638   ///   StChain: list of chains for the stores we have generated
 639   ///   ST:      store of a widen value
 640   void GenWidenVectorStores(SmallVector<SDValue, 16>& StChain, StoreSDNode *ST);
 641
 642   /// Helper genWidenVectorTruncStores - Helper function to generate a set of
 643   /// stores to store a truncate widen vector into non widen memory
 644   ///   StChain: list of chains for the stores we have generated
 645   ///   ST:      store of a widen value
 646   void GenWidenVectorTruncStores(SmallVector<SDValue, 16>& StChain,
 647                                  StoreSDNode *ST);
 648
 649   /// Modifies a vector input (widen or narrows) to a vector of NVT.  The
 650   /// input vector must have the same element type as NVT.
 651   SDValue ModifyToType(SDValue InOp, EVT WidenVT);
 652
 653
 654   //===--------------------------------------------------------------------===//
 655   // Generic Splitting: LegalizeTypesGeneric.cpp
 656   //===--------------------------------------------------------------------===//
 657
 658   // Legalization methods which only use that the illegal type is split into two
 659   // not necessarily identical types.  As such they can be used for splitting
 660   // vectors and expanding integers and floats.
 661
 662   void GetSplitOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 663     if (Op.getValueType().isVector())
 664       GetSplitVector(Op, Lo, Hi);
 665     else if (Op.getValueType().isInteger())
 666       GetExpandedInteger(Op, Lo, Hi);
 667     else
 668       GetExpandedFloat(Op, Lo, Hi);
 669   }
 670
 671   /// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
 672   /// which is split (or expanded) into two not necessarily identical pieces.
 673   void GetSplitDestVTs(EVT InVT, EVT &LoVT, EVT &HiVT);
 674
 675   /// GetPairElements - Use ISD::EXTRACT_ELEMENT nodes to extract the low and
 676   /// high parts of the given value.
 677   void GetPairElements(SDValue Pair, SDValue &Lo, SDValue &Hi);
 678
 679   // Generic Result Splitting.
 680   void SplitRes_MERGE_VALUES(SDNode *N, SDValue &Lo, SDValue &Hi);
 681   void SplitRes_SELECT      (SDNode *N, SDValue &Lo, SDValue &Hi);
 682   void SplitRes_SELECT_CC   (SDNode *N, SDValue &Lo, SDValue &Hi);
 683   void SplitRes_UNDEF       (SDNode *N, SDValue &Lo, SDValue &Hi);
 684
 685   //===--------------------------------------------------------------------===//
 686   // Generic Expansion: LegalizeTypesGeneric.cpp
 687   //===--------------------------------------------------------------------===//
 688
 689   // Legalization methods which only use that the illegal type is split into two
 690   // identical types of half the size, and that the Lo/Hi part is stored first
 691   // in memory on little/big-endian machines, followed by the Hi/Lo part.  As
 692   // such they can be used for expanding integers and floats.
 693
 694   void GetExpandedOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 695     if (Op.getValueType().isInteger())
 696       GetExpandedInteger(Op, Lo, Hi);
 697     else
 698       GetExpandedFloat(Op, Lo, Hi);
 699   }
 700
 701   // Generic Result Expansion.
 702   void ExpandRes_BITCAST           (SDNode *N, SDValue &Lo, SDValue &Hi);
 703   void ExpandRes_BUILD_PAIR        (SDNode *N, SDValue &Lo, SDValue &Hi);
 704   void ExpandRes_EXTRACT_ELEMENT   (SDNode *N, SDValue &Lo, SDValue &Hi);
 705   void ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 706   void ExpandRes_NormalLoad        (SDNode *N, SDValue &Lo, SDValue &Hi);
 707   void ExpandRes_VAARG             (SDNode *N, SDValue &Lo, SDValue &Hi);
 708
 709   // Generic Operand Expansion.
 710   SDValue ExpandOp_BITCAST          (SDNode *N);
 711   SDValue ExpandOp_BUILD_VECTOR     (SDNode *N);
 712   SDValue ExpandOp_EXTRACT_ELEMENT  (SDNode *N);
 713   SDValue ExpandOp_INSERT_VECTOR_ELT(SDNode *N);
 714   SDValue ExpandOp_SCALAR_TO_VECTOR (SDNode *N);
 715   SDValue ExpandOp_NormalStore      (SDNode *N, unsigned OpNo);
 716 };
 717
 718 } // end namespace llvm.
 719
 720 #endif