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 VISIBILITY_HIDDEN DAGTypeLegalizer {
  36   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   enum LegalizeAction {
  61     Legal,           // The target natively supports this type.
  62     PromoteInteger,  // Replace this integer type with a larger one.
  63     ExpandInteger,   // Split this integer type into two of half the size.
  64     SoftenFloat,     // Convert this float type to a same size integer type.
  65     ExpandFloat,     // Split this float type into two of half the size.
  66     ScalarizeVector, // Replace this one-element vector with its element type.
  67     SplitVector,     // This vector type should be split into smaller vectors.
  68     WidenVector      // This vector type should be widened into a larger vector.
  69   };
  70
  71   /// ValueTypeActions - This is a bitvector that contains two bits for each
  72   /// simple value type, where the two bits correspond to the LegalizeAction
  73   /// enum from TargetLowering.  This can be queried with "getTypeAction(VT)".
  74   TargetLowering::ValueTypeActionImpl ValueTypeActions;
  75
  76   /// getTypeAction - Return how we should legalize values of this type.
  77   LegalizeAction getTypeAction(MVT VT) const {
  78     switch (ValueTypeActions.getTypeAction(VT)) {
  79     default:
  80       assert(false && "Unknown legalize action!");
  81     case TargetLowering::Legal:
  82       return Legal;
  83     case TargetLowering::Promote:
  84       // Promote can mean
  85       //   1) For integers, use a larger integer type (e.g. i8 -> i32).
  86       //   2) For vectors, use a wider vector type (e.g. v3i32 -> v4i32).
  87       if (!VT.isVector())
  88         return PromoteInteger;
  89       else
  90         return WidenVector;
  91     case TargetLowering::Expand:
  92       // Expand can mean
  93       // 1) split scalar in half, 2) convert a float to an integer,
  94       // 3) scalarize a single-element vector, 4) split a vector in two.
  95       if (!VT.isVector()) {
  96         if (VT.isInteger())
  97           return ExpandInteger;
  98         else if (VT.getSizeInBits() ==
  99                  TLI.getTypeToTransformTo(VT).getSizeInBits())
 100           return SoftenFloat;
 101         else
 102           return ExpandFloat;
 103       } else if (VT.getVectorNumElements() == 1) {
 104         return ScalarizeVector;
 105       } else {
 106         return SplitVector;
 107       }
 108     }
 109   }
 110
 111   /// isTypeLegal - Return true if this type is legal on this target.
 112   bool isTypeLegal(MVT VT) const {
 113     return ValueTypeActions.getTypeAction(VT) == TargetLowering::Legal;
 114   }
 115
 116   /// IgnoreNodeResults - Pretend all of this node's results are legal.
 117   bool IgnoreNodeResults(SDNode *N) const {
 118     return N->getOpcode() == ISD::TargetConstant;
 119   }
 120
 121   /// PromotedIntegers - For integer nodes that are below legal width, this map
 122   /// indicates what promoted value to use.
 123   DenseMap<SDValue, SDValue> PromotedIntegers;
 124
 125   /// ExpandedIntegers - For integer nodes that need to be expanded this map
 126   /// indicates which operands are the expanded version of the input.
 127   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedIntegers;
 128
 129   /// SoftenedFloats - For floating point nodes converted to integers of
 130   /// the same size, this map indicates the converted value to use.
 131   DenseMap<SDValue, SDValue> SoftenedFloats;
 132
 133   /// ExpandedFloats - For float nodes that need to be expanded this map
 134   /// indicates which operands are the expanded version of the input.
 135   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedFloats;
 136
 137   /// ScalarizedVectors - For nodes that are <1 x ty>, this map indicates the
 138   /// scalar value of type 'ty' to use.
 139   DenseMap<SDValue, SDValue> ScalarizedVectors;
 140
 141   /// SplitVectors - For nodes that need to be split this map indicates
 142   /// which operands are the expanded version of the input.
 143   DenseMap<SDValue, std::pair<SDValue, SDValue> > SplitVectors;
 144
 145   /// WidenedVectors - For vector nodes that need to be widened, indicates
 146   /// the widened value to use.
 147   DenseMap<SDValue, SDValue> WidenedVectors;
 148
 149   /// ReplacedValues - For values that have been replaced with another,
 150   /// indicates the replacement value to use.
 151   DenseMap<SDValue, SDValue> ReplacedValues;
 152
 153   /// Worklist - This defines a worklist of nodes to process.  In order to be
 154   /// pushed onto this worklist, all operands of a node must have already been
 155   /// processed.
 156   SmallVector<SDNode*, 128> Worklist;
 157
 158 public:
 159   explicit DAGTypeLegalizer(SelectionDAG &dag)
 160     : TLI(dag.getTargetLoweringInfo()), DAG(dag),
 161     ValueTypeActions(TLI.getValueTypeActions()) {
 162     assert(MVT::LAST_VALUETYPE <= 32 &&
 163            "Too many value types for ValueTypeActions to hold!");
 164   }
 165
 166   /// run - This is the main entry point for the type legalizer.  This does a
 167   /// top-down traversal of the dag, legalizing types as it goes.  Returns
 168   /// "true" if it made any changes.
 169   bool run();
 170
 171   void NoteDeletion(SDNode *Old, SDNode *New) {
 172     ExpungeNode(Old);
 173     ExpungeNode(New);
 174     for (unsigned i = 0, e = Old->getNumValues(); i != e; ++i)
 175       ReplacedValues[SDValue(Old, i)] = SDValue(New, i);
 176   }
 177
 178 private:
 179   SDNode *AnalyzeNewNode(SDNode *N);
 180   void AnalyzeNewValue(SDValue &Val);
 181   void ExpungeNode(SDNode *N);
 182   void PerformExpensiveChecks();
 183   void RemapValue(SDValue &N);
 184
 185   // Common routines.
 186   SDValue BitConvertToInteger(SDValue Op);
 187   SDValue BitConvertVectorToIntegerVector(SDValue Op);
 188   SDValue CreateStackStoreLoad(SDValue Op, MVT DestVT);
 189   bool CustomLowerResults(SDNode *N, MVT VT, bool LegalizeResult);
 190   SDValue GetVectorElementPointer(SDValue VecPtr, MVT EltVT, SDValue Index);
 191   SDValue JoinIntegers(SDValue Lo, SDValue Hi);
 192   SDValue LibCallify(RTLIB::Libcall LC, SDNode *N, bool isSigned);
 193   SDValue MakeLibCall(RTLIB::Libcall LC, MVT RetVT,
 194                       const SDValue *Ops, unsigned NumOps, bool isSigned,
 195                       DebugLoc dl);
 196   SDValue PromoteTargetBoolean(SDValue Bool, MVT VT);
 197   void ReplaceValueWith(SDValue From, SDValue To);
 198   void ReplaceValueWithHelper(SDValue From, SDValue To);
 199   void SplitInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 200   void SplitInteger(SDValue Op, MVT LoVT, MVT HiVT,
 201                     SDValue &Lo, SDValue &Hi);
 202
 203   //===--------------------------------------------------------------------===//
 204   // Integer Promotion Support: LegalizeIntegerTypes.cpp
 205   //===--------------------------------------------------------------------===//
 206
 207   /// GetPromotedInteger - Given a processed operand Op which was promoted to a
 208   /// larger integer type, this returns the promoted value.  The low bits of the
 209   /// promoted value corresponding to the original type are exactly equal to Op.
 210   /// The extra bits contain rubbish, so the promoted value may need to be zero-
 211   /// or sign-extended from the original type before it is usable (the helpers
 212   /// SExtPromotedInteger and ZExtPromotedInteger can do this for you).
 213   /// For example, if Op is an i16 and was promoted to an i32, then this method
 214   /// returns an i32, the lower 16 bits of which coincide with Op, and the upper
 215   /// 16 bits of which contain rubbish.
 216   SDValue GetPromotedInteger(SDValue Op) {
 217     SDValue &PromotedOp = PromotedIntegers[Op];
 218     RemapValue(PromotedOp);
 219     assert(PromotedOp.getNode() && "Operand wasn't promoted?");
 220     return PromotedOp;
 221   }
 222   void SetPromotedInteger(SDValue Op, SDValue Result);
 223
 224   /// SExtPromotedInteger - Get a promoted operand and sign extend it to the
 225   /// final size.
 226   SDValue SExtPromotedInteger(SDValue Op) {
 227     MVT OldVT = Op.getValueType();
 228     DebugLoc dl = Op.getDebugLoc();
 229     Op = GetPromotedInteger(Op);
 230     return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(), Op,
 231                        DAG.getValueType(OldVT));
 232   }
 233
 234   /// ZExtPromotedInteger - Get a promoted operand and zero extend it to the
 235   /// final size.
 236   SDValue ZExtPromotedInteger(SDValue Op) {
 237     MVT OldVT = Op.getValueType();
 238     DebugLoc dl = Op.getDebugLoc();
 239     Op = GetPromotedInteger(Op);
 240     return DAG.getZeroExtendInReg(Op, dl, OldVT);
 241   }
 242
 243   // Integer Result Promotion.
 244   void PromoteIntegerResult(SDNode *N, unsigned ResNo);
 245   SDValue PromoteIntRes_AssertSext(SDNode *N);
 246   SDValue PromoteIntRes_AssertZext(SDNode *N);
 247   SDValue PromoteIntRes_Atomic1(AtomicSDNode *N);
 248   SDValue PromoteIntRes_Atomic2(AtomicSDNode *N);
 249   SDValue PromoteIntRes_BIT_CONVERT(SDNode *N);
 250   SDValue PromoteIntRes_BSWAP(SDNode *N);
 251   SDValue PromoteIntRes_BUILD_PAIR(SDNode *N);
 252   SDValue PromoteIntRes_Constant(SDNode *N);
 253   SDValue PromoteIntRes_CONVERT_RNDSAT(SDNode *N);
 254   SDValue PromoteIntRes_CTLZ(SDNode *N);
 255   SDValue PromoteIntRes_CTPOP(SDNode *N);
 256   SDValue PromoteIntRes_CTTZ(SDNode *N);
 257   SDValue PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N);
 258   SDValue PromoteIntRes_FP_TO_XINT(SDNode *N);
 259   SDValue PromoteIntRes_INT_EXTEND(SDNode *N);
 260   SDValue PromoteIntRes_LOAD(LoadSDNode *N);
 261   SDValue PromoteIntRes_Overflow(SDNode *N);
 262   SDValue PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo);
 263   SDValue PromoteIntRes_SDIV(SDNode *N);
 264   SDValue PromoteIntRes_SELECT(SDNode *N);
 265   SDValue PromoteIntRes_SELECT_CC(SDNode *N);
 266   SDValue PromoteIntRes_SETCC(SDNode *N);
 267   SDValue PromoteIntRes_SHL(SDNode *N);
 268   SDValue PromoteIntRes_SimpleIntBinOp(SDNode *N);
 269   SDValue PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N);
 270   SDValue PromoteIntRes_SRA(SDNode *N);
 271   SDValue PromoteIntRes_SRL(SDNode *N);
 272   SDValue PromoteIntRes_TRUNCATE(SDNode *N);
 273   SDValue PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo);
 274   SDValue PromoteIntRes_UDIV(SDNode *N);
 275   SDValue PromoteIntRes_UNDEF(SDNode *N);
 276   SDValue PromoteIntRes_VAARG(SDNode *N);
 277   SDValue PromoteIntRes_XMULO(SDNode *N, unsigned ResNo);
 278
 279   // Integer Operand Promotion.
 280   bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
 281   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
 282   SDValue PromoteIntOp_BIT_CONVERT(SDNode *N);
 283   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
 284   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
 285   SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);
 286   SDValue PromoteIntOp_BUILD_VECTOR(SDNode *N);
 287   SDValue PromoteIntOp_CONVERT_RNDSAT(SDNode *N);
 288   SDValue PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N, unsigned OpNo);
 289   SDValue PromoteIntOp_MEMBARRIER(SDNode *N);
 290   SDValue PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N);
 291   SDValue PromoteIntOp_SELECT(SDNode *N, unsigned OpNo);
 292   SDValue PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo);
 293   SDValue PromoteIntOp_SETCC(SDNode *N, unsigned OpNo);
 294   SDValue PromoteIntOp_Shift(SDNode *N);
 295   SDValue PromoteIntOp_SIGN_EXTEND(SDNode *N);
 296   SDValue PromoteIntOp_SINT_TO_FP(SDNode *N);
 297   SDValue PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 298   SDValue PromoteIntOp_TRUNCATE(SDNode *N);
 299   SDValue PromoteIntOp_UINT_TO_FP(SDNode *N);
 300   SDValue PromoteIntOp_ZERO_EXTEND(SDNode *N);
 301
 302   void PromoteSetCCOperands(SDValue &LHS,SDValue &RHS, ISD::CondCode Code);
 303
 304   //===--------------------------------------------------------------------===//
 305   // Integer Expansion Support: LegalizeIntegerTypes.cpp
 306   //===--------------------------------------------------------------------===//
 307
 308   /// GetExpandedInteger - Given a processed operand Op which was expanded into
 309   /// two integers of half the size, this returns the two halves.  The low bits
 310   /// of Op are exactly equal to the bits of Lo; the high bits exactly equal Hi.
 311   /// For example, if Op is an i64 which was expanded into two i32's, then this
 312   /// method returns the two i32's, with Lo being equal to the lower 32 bits of
 313   /// Op, and Hi being equal to the upper 32 bits.
 314   void GetExpandedInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 315   void SetExpandedInteger(SDValue Op, SDValue Lo, SDValue Hi);
 316
 317   // Integer Result Expansion.
 318   void ExpandIntegerResult(SDNode *N, unsigned ResNo);
 319   void ExpandIntRes_ANY_EXTEND        (SDNode *N, SDValue &Lo, SDValue &Hi);
 320   void ExpandIntRes_AssertSext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 321   void ExpandIntRes_AssertZext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 322   void ExpandIntRes_Constant          (SDNode *N, SDValue &Lo, SDValue &Hi);
 323   void ExpandIntRes_CTLZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 324   void ExpandIntRes_CTPOP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 325   void ExpandIntRes_CTTZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 326   void ExpandIntRes_LOAD          (LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 327   void ExpandIntRes_SIGN_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 328   void ExpandIntRes_SIGN_EXTEND_INREG (SDNode *N, SDValue &Lo, SDValue &Hi);
 329   void ExpandIntRes_TRUNCATE          (SDNode *N, SDValue &Lo, SDValue &Hi);
 330   void ExpandIntRes_ZERO_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 331   void ExpandIntRes_FP_TO_SINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 332   void ExpandIntRes_FP_TO_UINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 333
 334   void ExpandIntRes_Logical           (SDNode *N, SDValue &Lo, SDValue &Hi);
 335   void ExpandIntRes_ADDSUB            (SDNode *N, SDValue &Lo, SDValue &Hi);
 336   void ExpandIntRes_ADDSUBC           (SDNode *N, SDValue &Lo, SDValue &Hi);
 337   void ExpandIntRes_ADDSUBE           (SDNode *N, SDValue &Lo, SDValue &Hi);
 338   void ExpandIntRes_BSWAP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 339   void ExpandIntRes_MUL               (SDNode *N, SDValue &Lo, SDValue &Hi);
 340   void ExpandIntRes_SDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 341   void ExpandIntRes_SREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 342   void ExpandIntRes_UDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 343   void ExpandIntRes_UREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 344   void ExpandIntRes_Shift             (SDNode *N, SDValue &Lo, SDValue &Hi);
 345
 346   void ExpandShiftByConstant(SDNode *N, unsigned Amt,
 347                              SDValue &Lo, SDValue &Hi);
 348   bool ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 349   bool ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 350
 351   // Integer Operand Expansion.
 352   bool ExpandIntegerOperand(SDNode *N, unsigned OperandNo);
 353   SDValue ExpandIntOp_BIT_CONVERT(SDNode *N);
 354   SDValue ExpandIntOp_BR_CC(SDNode *N);
 355   SDValue ExpandIntOp_BUILD_VECTOR(SDNode *N);
 356   SDValue ExpandIntOp_EXTRACT_ELEMENT(SDNode *N);
 357   SDValue ExpandIntOp_SELECT_CC(SDNode *N);
 358   SDValue ExpandIntOp_SETCC(SDNode *N);
 359   SDValue ExpandIntOp_Shift(SDNode *N);
 360   SDValue ExpandIntOp_SINT_TO_FP(SDNode *N);
 361   SDValue ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 362   SDValue ExpandIntOp_TRUNCATE(SDNode *N);
 363   SDValue ExpandIntOp_UINT_TO_FP(SDNode *N);
 364
 365   void IntegerExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 366                                   ISD::CondCode &CCCode, DebugLoc dl);
 367
 368   //===--------------------------------------------------------------------===//
 369   // Float to Integer Conversion Support: LegalizeFloatTypes.cpp
 370   //===--------------------------------------------------------------------===//
 371
 372   /// GetSoftenedFloat - Given a processed operand Op which was converted to an
 373   /// integer of the same size, this returns the integer.  The integer contains
 374   /// exactly the same bits as Op - only the type changed.  For example, if Op
 375   /// is an f32 which was softened to an i32, then this method returns an i32,
 376   /// the bits of which coincide with those of Op.
 377   SDValue GetSoftenedFloat(SDValue Op) {
 378     SDValue &SoftenedOp = SoftenedFloats[Op];
 379     RemapValue(SoftenedOp);
 380     assert(SoftenedOp.getNode() && "Operand wasn't converted to integer?");
 381     return SoftenedOp;
 382   }
 383   void SetSoftenedFloat(SDValue Op, SDValue Result);
 384
 385   // Result Float to Integer Conversion.
 386   void SoftenFloatResult(SDNode *N, unsigned OpNo);
 387   SDValue SoftenFloatRes_BIT_CONVERT(SDNode *N);
 388   SDValue SoftenFloatRes_BUILD_PAIR(SDNode *N);
 389   SDValue SoftenFloatRes_ConstantFP(ConstantFPSDNode *N);
 390   SDValue SoftenFloatRes_EXTRACT_VECTOR_ELT(SDNode *N);
 391   SDValue SoftenFloatRes_FABS(SDNode *N);
 392   SDValue SoftenFloatRes_FADD(SDNode *N);
 393   SDValue SoftenFloatRes_FCEIL(SDNode *N);
 394   SDValue SoftenFloatRes_FCOPYSIGN(SDNode *N);
 395   SDValue SoftenFloatRes_FCOS(SDNode *N);
 396   SDValue SoftenFloatRes_FDIV(SDNode *N);
 397   SDValue SoftenFloatRes_FEXP(SDNode *N);
 398   SDValue SoftenFloatRes_FEXP2(SDNode *N);
 399   SDValue SoftenFloatRes_FFLOOR(SDNode *N);
 400   SDValue SoftenFloatRes_FLOG(SDNode *N);
 401   SDValue SoftenFloatRes_FLOG2(SDNode *N);
 402   SDValue SoftenFloatRes_FLOG10(SDNode *N);
 403   SDValue SoftenFloatRes_FMUL(SDNode *N);
 404   SDValue SoftenFloatRes_FNEARBYINT(SDNode *N);
 405   SDValue SoftenFloatRes_FNEG(SDNode *N);
 406   SDValue SoftenFloatRes_FP_EXTEND(SDNode *N);
 407   SDValue SoftenFloatRes_FP_ROUND(SDNode *N);
 408   SDValue SoftenFloatRes_FPOW(SDNode *N);
 409   SDValue SoftenFloatRes_FPOWI(SDNode *N);
 410   SDValue SoftenFloatRes_FREM(SDNode *N);
 411   SDValue SoftenFloatRes_FRINT(SDNode *N);
 412   SDValue SoftenFloatRes_FSIN(SDNode *N);
 413   SDValue SoftenFloatRes_FSQRT(SDNode *N);
 414   SDValue SoftenFloatRes_FSUB(SDNode *N);
 415   SDValue SoftenFloatRes_FTRUNC(SDNode *N);
 416   SDValue SoftenFloatRes_LOAD(SDNode *N);
 417   SDValue SoftenFloatRes_SELECT(SDNode *N);
 418   SDValue SoftenFloatRes_SELECT_CC(SDNode *N);
 419   SDValue SoftenFloatRes_UNDEF(SDNode *N);
 420   SDValue SoftenFloatRes_VAARG(SDNode *N);
 421   SDValue SoftenFloatRes_XINT_TO_FP(SDNode *N);
 422
 423   // Operand Float to Integer Conversion.
 424   bool SoftenFloatOperand(SDNode *N, unsigned OpNo);
 425   SDValue SoftenFloatOp_BIT_CONVERT(SDNode *N);
 426   SDValue SoftenFloatOp_BR_CC(SDNode *N);
 427   SDValue SoftenFloatOp_FP_ROUND(SDNode *N);
 428   SDValue SoftenFloatOp_FP_TO_SINT(SDNode *N);
 429   SDValue SoftenFloatOp_FP_TO_UINT(SDNode *N);
 430   SDValue SoftenFloatOp_SELECT_CC(SDNode *N);
 431   SDValue SoftenFloatOp_SETCC(SDNode *N);
 432   SDValue SoftenFloatOp_STORE(SDNode *N, unsigned OpNo);
 433
 434   void SoftenSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 435                            ISD::CondCode &CCCode, DebugLoc dl);
 436
 437   //===--------------------------------------------------------------------===//
 438   // Float Expansion Support: LegalizeFloatTypes.cpp
 439   //===--------------------------------------------------------------------===//
 440
 441   /// GetExpandedFloat - Given a processed operand Op which was expanded into
 442   /// two floating point values of half the size, this returns the two halves.
 443   /// The low bits of Op are exactly equal to the bits of Lo; the high bits
 444   /// exactly equal Hi.  For example, if Op is a ppcf128 which was expanded
 445   /// into two f64's, then this method returns the two f64's, with Lo being
 446   /// equal to the lower 64 bits of Op, and Hi to the upper 64 bits.
 447   void GetExpandedFloat(SDValue Op, SDValue &Lo, SDValue &Hi);
 448   void SetExpandedFloat(SDValue Op, SDValue Lo, SDValue Hi);
 449
 450   // Float Result Expansion.
 451   void ExpandFloatResult(SDNode *N, unsigned ResNo);
 452   void ExpandFloatRes_ConstantFP(SDNode *N, SDValue &Lo, SDValue &Hi);
 453   void ExpandFloatRes_FABS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 454   void ExpandFloatRes_FADD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 455   void ExpandFloatRes_FCEIL     (SDNode *N, SDValue &Lo, SDValue &Hi);
 456   void ExpandFloatRes_FCOS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 457   void ExpandFloatRes_FDIV      (SDNode *N, SDValue &Lo, SDValue &Hi);
 458   void ExpandFloatRes_FEXP      (SDNode *N, SDValue &Lo, SDValue &Hi);
 459   void ExpandFloatRes_FEXP2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 460   void ExpandFloatRes_FFLOOR    (SDNode *N, SDValue &Lo, SDValue &Hi);
 461   void ExpandFloatRes_FLOG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 462   void ExpandFloatRes_FLOG2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 463   void ExpandFloatRes_FLOG10    (SDNode *N, SDValue &Lo, SDValue &Hi);
 464   void ExpandFloatRes_FMUL      (SDNode *N, SDValue &Lo, SDValue &Hi);
 465   void ExpandFloatRes_FNEARBYINT(SDNode *N, SDValue &Lo, SDValue &Hi);
 466   void ExpandFloatRes_FNEG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 467   void ExpandFloatRes_FP_EXTEND (SDNode *N, SDValue &Lo, SDValue &Hi);
 468   void ExpandFloatRes_FPOW      (SDNode *N, SDValue &Lo, SDValue &Hi);
 469   void ExpandFloatRes_FPOWI     (SDNode *N, SDValue &Lo, SDValue &Hi);
 470   void ExpandFloatRes_FRINT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 471   void ExpandFloatRes_FSIN      (SDNode *N, SDValue &Lo, SDValue &Hi);
 472   void ExpandFloatRes_FSQRT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 473   void ExpandFloatRes_FSUB      (SDNode *N, SDValue &Lo, SDValue &Hi);
 474   void ExpandFloatRes_FTRUNC    (SDNode *N, SDValue &Lo, SDValue &Hi);
 475   void ExpandFloatRes_LOAD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 476   void ExpandFloatRes_XINT_TO_FP(SDNode *N, SDValue &Lo, SDValue &Hi);
 477
 478   // Float Operand Expansion.
 479   bool ExpandFloatOperand(SDNode *N, unsigned OperandNo);
 480   SDValue ExpandFloatOp_BR_CC(SDNode *N);
 481   SDValue ExpandFloatOp_FP_ROUND(SDNode *N);
 482   SDValue ExpandFloatOp_FP_TO_SINT(SDNode *N);
 483   SDValue ExpandFloatOp_FP_TO_UINT(SDNode *N);
 484   SDValue ExpandFloatOp_SELECT_CC(SDNode *N);
 485   SDValue ExpandFloatOp_SETCC(SDNode *N);
 486   SDValue ExpandFloatOp_STORE(SDNode *N, unsigned OpNo);
 487
 488   void FloatExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 489                                 ISD::CondCode &CCCode, DebugLoc dl);
 490
 491   //===--------------------------------------------------------------------===//
 492   // Scalarization Support: LegalizeVectorTypes.cpp
 493   //===--------------------------------------------------------------------===//
 494
 495   /// GetScalarizedVector - Given a processed one-element vector Op which was
 496   /// scalarized to its element type, this returns the element.  For example,
 497   /// if Op is a v1i32, Op = < i32 val >, this method returns val, an i32.
 498   SDValue GetScalarizedVector(SDValue Op) {
 499     SDValue &ScalarizedOp = ScalarizedVectors[Op];
 500     RemapValue(ScalarizedOp);
 501     assert(ScalarizedOp.getNode() && "Operand wasn't scalarized?");
 502     return ScalarizedOp;
 503   }
 504   void SetScalarizedVector(SDValue Op, SDValue Result);
 505
 506   // Vector Result Scalarization: <1 x ty> -> ty.
 507   void ScalarizeVectorResult(SDNode *N, unsigned OpNo);
 508   SDValue ScalarizeVecRes_BinOp(SDNode *N);
 509   SDValue ScalarizeVecRes_ShiftOp(SDNode *N);
 510   SDValue ScalarizeVecRes_UnaryOp(SDNode *N);
 511
 512   SDValue ScalarizeVecRes_BIT_CONVERT(SDNode *N);
 513   SDValue ScalarizeVecRes_CONVERT_RNDSAT(SDNode *N);
 514   SDValue ScalarizeVecRes_EXTRACT_SUBVECTOR(SDNode *N);
 515   SDValue ScalarizeVecRes_FPOWI(SDNode *N);
 516   SDValue ScalarizeVecRes_INSERT_VECTOR_ELT(SDNode *N);
 517   SDValue ScalarizeVecRes_LOAD(LoadSDNode *N);
 518   SDValue ScalarizeVecRes_SCALAR_TO_VECTOR(SDNode *N);
 519   SDValue ScalarizeVecRes_SELECT(SDNode *N);
 520   SDValue ScalarizeVecRes_SELECT_CC(SDNode *N);
 521   SDValue ScalarizeVecRes_UNDEF(SDNode *N);
 522   SDValue ScalarizeVecRes_VECTOR_SHUFFLE(SDNode *N);
 523   SDValue ScalarizeVecRes_VSETCC(SDNode *N);
 524
 525   // Vector Operand Scalarization: <1 x ty> -> ty.
 526   bool ScalarizeVectorOperand(SDNode *N, unsigned OpNo);
 527   SDValue ScalarizeVecOp_BIT_CONVERT(SDNode *N);
 528   SDValue ScalarizeVecOp_CONCAT_VECTORS(SDNode *N);
 529   SDValue ScalarizeVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 530   SDValue ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 531
 532   //===--------------------------------------------------------------------===//
 533   // Vector Splitting Support: LegalizeVectorTypes.cpp
 534   //===--------------------------------------------------------------------===//
 535
 536   /// GetSplitVector - Given a processed vector Op which was split into smaller
 537   /// vectors, this method returns the smaller vectors.  The first elements of
 538   /// Op coincide with the elements of Lo; the remaining elements of Op coincide
 539   /// with the elements of Hi: Op is what you would get by concatenating Lo and
 540   /// Hi.  For example, if Op is a v8i32 that was split into two v4i32's, then
 541   /// this method returns the two v4i32's, with Lo corresponding to the first 4
 542   /// elements of Op, and Hi to the last 4 elements.
 543   void GetSplitVector(SDValue Op, SDValue &Lo, SDValue &Hi);
 544   void SetSplitVector(SDValue Op, SDValue Lo, SDValue Hi);
 545
 546   // Vector Result Splitting: <128 x ty> -> 2 x <64 x ty>.
 547   void SplitVectorResult(SDNode *N, unsigned OpNo);
 548   void SplitVecRes_BinOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 549   void SplitVecRes_UnaryOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 550
 551   void SplitVecRes_BIT_CONVERT(SDNode *N, SDValue &Lo, SDValue &Hi);
 552   void SplitVecRes_BUILD_PAIR(SDNode *N, SDValue &Lo, SDValue &Hi);
 553   void SplitVecRes_BUILD_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 554   void SplitVecRes_CONCAT_VECTORS(SDNode *N, SDValue &Lo, SDValue &Hi);
 555   void SplitVecRes_CONVERT_RNDSAT(SDNode *N, SDValue &Lo, SDValue &Hi);
 556   void SplitVecRes_EXTRACT_SUBVECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 557   void SplitVecRes_FPOWI(SDNode *N, SDValue &Lo, SDValue &Hi);
 558   void SplitVecRes_INSERT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 559   void SplitVecRes_LOAD(LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 560   void SplitVecRes_SCALAR_TO_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 561   void SplitVecRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi);
 562   void SplitVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N, SDValue &Lo,
 563                                   SDValue &Hi);
 564   void SplitVecRes_VSETCC(SDNode *N, SDValue &Lo, SDValue &Hi);
 565
 566   // Vector Operand Splitting: <128 x ty> -> 2 x <64 x ty>.
 567   bool SplitVectorOperand(SDNode *N, unsigned OpNo);
 568   SDValue SplitVecOp_UnaryOp(SDNode *N);
 569
 570   SDValue SplitVecOp_BIT_CONVERT(SDNode *N);
 571   SDValue SplitVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 572   SDValue SplitVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 573   SDValue SplitVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 574
 575   //===--------------------------------------------------------------------===//
 576   // Vector Widening Support: LegalizeVectorTypes.cpp
 577   //===--------------------------------------------------------------------===//
 578
 579   /// GetWidenedVector - Given a processed vector Op which was widened into a
 580   /// larger vector, this method returns the larger vector.  The elements of
 581   /// the returned vector consist of the elements of Op followed by elements
 582   /// containing rubbish.  For example, if Op is a v2i32 that was widened to a
 583   /// v4i32, then this method returns a v4i32 for which the first two elements
 584   /// are the same as those of Op, while the last two elements contain rubbish.
 585   SDValue GetWidenedVector(SDValue Op) {
 586     SDValue &WidenedOp = WidenedVectors[Op];
 587     RemapValue(WidenedOp);
 588     assert(WidenedOp.getNode() && "Operand wasn't widened?");
 589     return WidenedOp;
 590   }
 591   void SetWidenedVector(SDValue Op, SDValue Result);
 592
 593   // Widen Vector Result Promotion.
 594   void WidenVectorResult(SDNode *N, unsigned ResNo);
 595   SDValue WidenVecRes_BIT_CONVERT(SDNode* N);
 596   SDValue WidenVecRes_BUILD_VECTOR(SDNode* N);
 597   SDValue WidenVecRes_CONCAT_VECTORS(SDNode* N);
 598   SDValue WidenVecRes_CONVERT_RNDSAT(SDNode* N);
 599   SDValue WidenVecRes_EXTRACT_SUBVECTOR(SDNode* N);
 600   SDValue WidenVecRes_INSERT_VECTOR_ELT(SDNode* N);
 601   SDValue WidenVecRes_LOAD(SDNode* N);
 602   SDValue WidenVecRes_SCALAR_TO_VECTOR(SDNode* N);
 603   SDValue WidenVecRes_SELECT(SDNode* N);
 604   SDValue WidenVecRes_SELECT_CC(SDNode* N);
 605   SDValue WidenVecRes_UNDEF(SDNode *N);
 606   SDValue WidenVecRes_VECTOR_SHUFFLE(ShuffleVectorSDNode *N);
 607   SDValue WidenVecRes_VSETCC(SDNode* N);
 608
 609   SDValue WidenVecRes_Binary(SDNode *N);
 610   SDValue WidenVecRes_Convert(SDNode *N);
 611   SDValue WidenVecRes_Shift(SDNode *N);
 612   SDValue WidenVecRes_Unary(SDNode *N);
 613
 614   // Widen Vector Operand.
 615   bool WidenVectorOperand(SDNode *N, unsigned ResNo);
 616   SDValue WidenVecOp_BIT_CONVERT(SDNode *N);
 617   SDValue WidenVecOp_CONCAT_VECTORS(SDNode *N);
 618   SDValue WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 619   SDValue WidenVecOp_STORE(SDNode* N);
 620
 621   SDValue WidenVecOp_Convert(SDNode *N);
 622
 623   //===--------------------------------------------------------------------===//
 624   // Vector Widening Utilities Support: LegalizeVectorTypes.cpp
 625   //===--------------------------------------------------------------------===//
 626
 627   /// Helper genWidenVectorLoads - Helper function to generate a set of
 628   /// loads to load a vector with a resulting wider type. It takes
 629   ///   ExtType: Extension type
 630   ///   LdChain: list of chains for the load we have generated.
 631   ///   Chain:   incoming chain for the ld vector.
 632   ///   BasePtr: base pointer to load from.
 633   ///   SV:         memory disambiguation source value.
 634   ///   SVOffset:   memory disambiugation offset.
 635   ///   Alignment:  alignment of the memory.
 636   ///   isVolatile: volatile load.
 637   ///   LdWidth:    width of memory that we want to load.
 638   ///   ResType:    the wider result result type for the resulting vector.
 639   ///   dl:         DebugLoc to be applied to new nodes
 640   SDValue GenWidenVectorLoads(SmallVector<SDValue, 16>& LdChain, SDValue Chain,
 641                               SDValue BasePtr, const Value *SV,
 642                               int SVOffset, unsigned Alignment,
 643                               bool isVolatile, unsigned LdWidth,
 644                               MVT ResType, DebugLoc dl);
 645
 646   /// Helper genWidenVectorStores - Helper function to generate a set of
 647   /// stores to store a widen vector into non widen memory
 648   /// It takes
 649   ///   StChain: list of chains for the stores we have generated
 650   ///   Chain:   incoming chain for the ld vector
 651   ///   BasePtr: base pointer to load from
 652   ///   SV:      memory disambiguation source value
 653   ///   SVOffset:   memory disambiugation offset
 654   ///   Alignment:  alignment of the memory
 655   ///   isVolatile: volatile lod
 656   ///   ValOp:   value to store
 657   ///   StWidth: width of memory that we want to store
 658   ///   dl:         DebugLoc to be applied to new nodes
 659   void GenWidenVectorStores(SmallVector<SDValue, 16>& StChain, SDValue Chain,
 660                             SDValue BasePtr, const Value *SV,
 661                             int SVOffset, unsigned Alignment,
 662                             bool isVolatile, SDValue ValOp,
 663                             unsigned StWidth, DebugLoc dl);
 664
 665   /// Modifies a vector input (widen or narrows) to a vector of NVT.  The
 666   /// input vector must have the same element type as NVT.
 667   SDValue ModifyToType(SDValue InOp, MVT WidenVT);
 668
 669
 670   //===--------------------------------------------------------------------===//
 671   // Generic Splitting: LegalizeTypesGeneric.cpp
 672   //===--------------------------------------------------------------------===//
 673
 674   // Legalization methods which only use that the illegal type is split into two
 675   // not necessarily identical types.  As such they can be used for splitting
 676   // vectors and expanding integers and floats.
 677
 678   void GetSplitOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 679     if (Op.getValueType().isVector())
 680       GetSplitVector(Op, Lo, Hi);
 681     else if (Op.getValueType().isInteger())
 682       GetExpandedInteger(Op, Lo, Hi);
 683     else
 684       GetExpandedFloat(Op, Lo, Hi);
 685   }
 686
 687   /// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
 688   /// which is split (or expanded) into two not necessarily identical pieces.
 689   void GetSplitDestVTs(MVT InVT, MVT &LoVT, MVT &HiVT);
 690
 691   /// GetPairElements - Use ISD::EXTRACT_ELEMENT nodes to extract the low and
 692   /// high parts of the given value.
 693   void GetPairElements(SDValue Pair, SDValue &Lo, SDValue &Hi);
 694
 695   // Generic Result Splitting.
 696   void SplitRes_MERGE_VALUES(SDNode *N, SDValue &Lo, SDValue &Hi);
 697   void SplitRes_SELECT      (SDNode *N, SDValue &Lo, SDValue &Hi);
 698   void SplitRes_SELECT_CC   (SDNode *N, SDValue &Lo, SDValue &Hi);
 699   void SplitRes_UNDEF       (SDNode *N, SDValue &Lo, SDValue &Hi);
 700
 701   //===--------------------------------------------------------------------===//
 702   // Generic Expansion: LegalizeTypesGeneric.cpp
 703   //===--------------------------------------------------------------------===//
 704
 705   // Legalization methods which only use that the illegal type is split into two
 706   // identical types of half the size, and that the Lo/Hi part is stored first
 707   // in memory on little/big-endian machines, followed by the Hi/Lo part.  As
 708   // such they can be used for expanding integers and floats.
 709
 710   void GetExpandedOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 711     if (Op.getValueType().isInteger())
 712       GetExpandedInteger(Op, Lo, Hi);
 713     else
 714       GetExpandedFloat(Op, Lo, Hi);
 715   }
 716
 717   // Generic Result Expansion.
 718   void ExpandRes_BIT_CONVERT       (SDNode *N, SDValue &Lo, SDValue &Hi);
 719   void ExpandRes_BUILD_PAIR        (SDNode *N, SDValue &Lo, SDValue &Hi);
 720   void ExpandRes_EXTRACT_ELEMENT   (SDNode *N, SDValue &Lo, SDValue &Hi);
 721   void ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 722   void ExpandRes_NormalLoad        (SDNode *N, SDValue &Lo, SDValue &Hi);
 723   void ExpandRes_VAARG             (SDNode *N, SDValue &Lo, SDValue &Hi);
 724
 725   // Generic Operand Expansion.
 726   SDValue ExpandOp_BIT_CONVERT      (SDNode *N);
 727   SDValue ExpandOp_BUILD_VECTOR     (SDNode *N);
 728   SDValue ExpandOp_EXTRACT_ELEMENT  (SDNode *N);
 729   SDValue ExpandOp_INSERT_VECTOR_ELT(SDNode *N);
 730   SDValue ExpandOp_SCALAR_TO_VECTOR (SDNode *N);
 731   SDValue ExpandOp_NormalStore      (SDNode *N, unsigned OpNo);
 732 };
 733
 734 } // end namespace llvm.
 735
 736 #endif