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   /// FIXME: Remove once PR2957 is done.
 118   bool IgnoreNodeResults(SDNode *N) const {
 119     return N->getOpcode() == ISD::TargetConstant ||
 120            IgnoredNodesResultsSet.count(N);
 121   }
 122
 123   /// IgnoredNode - Set of nodes whose result don't need to be legal.
 124   /// FIXME: Remove once PR2957 is done.
 125   DenseSet<SDNode*> IgnoredNodesResultsSet;
 126
 127   /// PromotedIntegers - For integer nodes that are below legal width, this map
 128   /// indicates what promoted value to use.
 129   DenseMap<SDValue, SDValue> PromotedIntegers;
 130
 131   /// ExpandedIntegers - For integer nodes that need to be expanded this map
 132   /// indicates which operands are the expanded version of the input.
 133   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedIntegers;
 134
 135   /// SoftenedFloats - For floating point nodes converted to integers of
 136   /// the same size, this map indicates the converted value to use.
 137   DenseMap<SDValue, SDValue> SoftenedFloats;
 138
 139   /// ExpandedFloats - For float nodes that need to be expanded this map
 140   /// indicates which operands are the expanded version of the input.
 141   DenseMap<SDValue, std::pair<SDValue, SDValue> > ExpandedFloats;
 142
 143   /// ScalarizedVectors - For nodes that are <1 x ty>, this map indicates the
 144   /// scalar value of type 'ty' to use.
 145   DenseMap<SDValue, SDValue> ScalarizedVectors;
 146
 147   /// SplitVectors - For nodes that need to be split this map indicates
 148   /// which operands are the expanded version of the input.
 149   DenseMap<SDValue, std::pair<SDValue, SDValue> > SplitVectors;
 150
 151   /// WidenedVectors - For vector nodes that need to be widened, indicates
 152   /// the widened value to use.
 153   DenseMap<SDValue, SDValue> WidenedVectors;
 154
 155   /// ReplacedValues - For values that have been replaced with another,
 156   /// indicates the replacement value to use.
 157   DenseMap<SDValue, SDValue> ReplacedValues;
 158
 159   /// Worklist - This defines a worklist of nodes to process.  In order to be
 160   /// pushed onto this worklist, all operands of a node must have already been
 161   /// processed.
 162   SmallVector<SDNode*, 128> Worklist;
 163
 164 public:
 165   explicit DAGTypeLegalizer(SelectionDAG &dag)
 166     : TLI(dag.getTargetLoweringInfo()), DAG(dag),
 167     ValueTypeActions(TLI.getValueTypeActions()) {
 168     assert(MVT::LAST_VALUETYPE <= 32 &&
 169            "Too many value types for ValueTypeActions to hold!");
 170   }
 171
 172   /// run - This is the main entry point for the type legalizer.  This does a
 173   /// top-down traversal of the dag, legalizing types as it goes.  Returns
 174   /// "true" if it made any changes.
 175   bool run();
 176
 177   void NoteDeletion(SDNode *Old, SDNode *New) {
 178     ExpungeNode(Old);
 179     ExpungeNode(New);
 180     for (unsigned i = 0, e = Old->getNumValues(); i != e; ++i)
 181       ReplacedValues[SDValue(Old, i)] = SDValue(New, i);
 182   }
 183
 184 private:
 185   SDNode *AnalyzeNewNode(SDNode *N);
 186   void AnalyzeNewValue(SDValue &Val);
 187   void ExpungeNode(SDNode *N);
 188   void PerformExpensiveChecks();
 189   void RemapValue(SDValue &N);
 190
 191   // Common routines.
 192   SDValue BitConvertToInteger(SDValue Op);
 193   SDValue BitConvertVectorToIntegerVector(SDValue Op);
 194   SDValue CreateStackStoreLoad(SDValue Op, MVT DestVT);
 195   bool CustomLowerResults(SDNode *N, MVT VT, bool LegalizeResult);
 196   SDValue GetVectorElementPointer(SDValue VecPtr, MVT EltVT, SDValue Index);
 197   SDValue JoinIntegers(SDValue Lo, SDValue Hi);
 198   SDValue LibCallify(RTLIB::Libcall LC, SDNode *N, bool isSigned);
 199   SDValue MakeLibCall(RTLIB::Libcall LC, MVT RetVT,
 200                       const SDValue *Ops, unsigned NumOps, bool isSigned,
 201                       DebugLoc dl);
 202   SDValue PromoteTargetBoolean(SDValue Bool, MVT VT);
 203   void ReplaceValueWith(SDValue From, SDValue To);
 204   void ReplaceValueWithHelper(SDValue From, SDValue To);
 205   void SetIgnoredNodeResult(SDNode* N);
 206   void SplitInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 207   void SplitInteger(SDValue Op, MVT LoVT, MVT HiVT,
 208                     SDValue &Lo, SDValue &Hi);
 209
 210   //===--------------------------------------------------------------------===//
 211   // Integer Promotion Support: LegalizeIntegerTypes.cpp
 212   //===--------------------------------------------------------------------===//
 213
 214   /// GetPromotedInteger - Given a processed operand Op which was promoted to a
 215   /// larger integer type, this returns the promoted value.  The low bits of the
 216   /// promoted value corresponding to the original type are exactly equal to Op.
 217   /// The extra bits contain rubbish, so the promoted value may need to be zero-
 218   /// or sign-extended from the original type before it is usable (the helpers
 219   /// SExtPromotedInteger and ZExtPromotedInteger can do this for you).
 220   /// For example, if Op is an i16 and was promoted to an i32, then this method
 221   /// returns an i32, the lower 16 bits of which coincide with Op, and the upper
 222   /// 16 bits of which contain rubbish.
 223   SDValue GetPromotedInteger(SDValue Op) {
 224     SDValue &PromotedOp = PromotedIntegers[Op];
 225     RemapValue(PromotedOp);
 226     assert(PromotedOp.getNode() && "Operand wasn't promoted?");
 227     return PromotedOp;
 228   }
 229   void SetPromotedInteger(SDValue Op, SDValue Result);
 230
 231   /// SExtPromotedInteger - Get a promoted operand and sign extend it to the
 232   /// final size.
 233   SDValue SExtPromotedInteger(SDValue Op) {
 234     MVT OldVT = Op.getValueType();
 235     DebugLoc dl = Op.getDebugLoc();
 236     Op = GetPromotedInteger(Op);
 237     return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(), Op,
 238                        DAG.getValueType(OldVT));
 239   }
 240
 241   /// ZExtPromotedInteger - Get a promoted operand and zero extend it to the
 242   /// final size.
 243   SDValue ZExtPromotedInteger(SDValue Op) {
 244     MVT OldVT = Op.getValueType();
 245     DebugLoc dl = Op.getDebugLoc();
 246     Op = GetPromotedInteger(Op);
 247     return DAG.getZeroExtendInReg(Op, dl, OldVT);
 248   }
 249
 250   // Integer Result Promotion.
 251   void PromoteIntegerResult(SDNode *N, unsigned ResNo);
 252   SDValue PromoteIntRes_AssertSext(SDNode *N);
 253   SDValue PromoteIntRes_AssertZext(SDNode *N);
 254   SDValue PromoteIntRes_Atomic1(AtomicSDNode *N);
 255   SDValue PromoteIntRes_Atomic2(AtomicSDNode *N);
 256   SDValue PromoteIntRes_BIT_CONVERT(SDNode *N);
 257   SDValue PromoteIntRes_BSWAP(SDNode *N);
 258   SDValue PromoteIntRes_BUILD_PAIR(SDNode *N);
 259   SDValue PromoteIntRes_Constant(SDNode *N);
 260   SDValue PromoteIntRes_CONVERT_RNDSAT(SDNode *N);
 261   SDValue PromoteIntRes_CTLZ(SDNode *N);
 262   SDValue PromoteIntRes_CTPOP(SDNode *N);
 263   SDValue PromoteIntRes_CTTZ(SDNode *N);
 264   SDValue PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N);
 265   SDValue PromoteIntRes_FP_TO_XINT(SDNode *N);
 266   SDValue PromoteIntRes_INT_EXTEND(SDNode *N);
 267   SDValue PromoteIntRes_LOAD(LoadSDNode *N);
 268   SDValue PromoteIntRes_Overflow(SDNode *N);
 269   SDValue PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo);
 270   SDValue PromoteIntRes_SDIV(SDNode *N);
 271   SDValue PromoteIntRes_SELECT(SDNode *N);
 272   SDValue PromoteIntRes_SELECT_CC(SDNode *N);
 273   SDValue PromoteIntRes_SETCC(SDNode *N);
 274   SDValue PromoteIntRes_SHL(SDNode *N);
 275   SDValue PromoteIntRes_SimpleIntBinOp(SDNode *N);
 276   SDValue PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N);
 277   SDValue PromoteIntRes_SRA(SDNode *N);
 278   SDValue PromoteIntRes_SRL(SDNode *N);
 279   SDValue PromoteIntRes_TRUNCATE(SDNode *N);
 280   SDValue PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo);
 281   SDValue PromoteIntRes_UDIV(SDNode *N);
 282   SDValue PromoteIntRes_UNDEF(SDNode *N);
 283   SDValue PromoteIntRes_VAARG(SDNode *N);
 284   SDValue PromoteIntRes_XMULO(SDNode *N, unsigned ResNo);
 285
 286   // Integer Operand Promotion.
 287   bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
 288   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
 289   SDValue PromoteIntOp_BIT_CONVERT(SDNode *N);
 290   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
 291   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
 292   SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);
 293   SDValue PromoteIntOp_BUILD_VECTOR(SDNode *N);
 294   SDValue PromoteIntOp_CONVERT_RNDSAT(SDNode *N);
 295   SDValue PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N, unsigned OpNo);
 296   SDValue PromoteIntOp_MEMBARRIER(SDNode *N);
 297   SDValue PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N);
 298   SDValue PromoteIntOp_SELECT(SDNode *N, unsigned OpNo);
 299   SDValue PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo);
 300   SDValue PromoteIntOp_SETCC(SDNode *N, unsigned OpNo);
 301   SDValue PromoteIntOp_Shift(SDNode *N);
 302   SDValue PromoteIntOp_SIGN_EXTEND(SDNode *N);
 303   SDValue PromoteIntOp_SINT_TO_FP(SDNode *N);
 304   SDValue PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 305   SDValue PromoteIntOp_TRUNCATE(SDNode *N);
 306   SDValue PromoteIntOp_UINT_TO_FP(SDNode *N);
 307   SDValue PromoteIntOp_ZERO_EXTEND(SDNode *N);
 308
 309   void PromoteSetCCOperands(SDValue &LHS,SDValue &RHS, ISD::CondCode Code);
 310
 311   //===--------------------------------------------------------------------===//
 312   // Integer Expansion Support: LegalizeIntegerTypes.cpp
 313   //===--------------------------------------------------------------------===//
 314
 315   /// GetExpandedInteger - Given a processed operand Op which was expanded into
 316   /// two integers of half the size, this returns the two halves.  The low bits
 317   /// of Op are exactly equal to the bits of Lo; the high bits exactly equal Hi.
 318   /// For example, if Op is an i64 which was expanded into two i32's, then this
 319   /// method returns the two i32's, with Lo being equal to the lower 32 bits of
 320   /// Op, and Hi being equal to the upper 32 bits.
 321   void GetExpandedInteger(SDValue Op, SDValue &Lo, SDValue &Hi);
 322   void SetExpandedInteger(SDValue Op, SDValue Lo, SDValue Hi);
 323
 324   // Integer Result Expansion.
 325   void ExpandIntegerResult(SDNode *N, unsigned ResNo);
 326   void ExpandIntRes_ANY_EXTEND        (SDNode *N, SDValue &Lo, SDValue &Hi);
 327   void ExpandIntRes_AssertSext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 328   void ExpandIntRes_AssertZext        (SDNode *N, SDValue &Lo, SDValue &Hi);
 329   void ExpandIntRes_Constant          (SDNode *N, SDValue &Lo, SDValue &Hi);
 330   void ExpandIntRes_CTLZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 331   void ExpandIntRes_CTPOP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 332   void ExpandIntRes_CTTZ              (SDNode *N, SDValue &Lo, SDValue &Hi);
 333   void ExpandIntRes_LOAD          (LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 334   void ExpandIntRes_SIGN_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 335   void ExpandIntRes_SIGN_EXTEND_INREG (SDNode *N, SDValue &Lo, SDValue &Hi);
 336   void ExpandIntRes_TRUNCATE          (SDNode *N, SDValue &Lo, SDValue &Hi);
 337   void ExpandIntRes_ZERO_EXTEND       (SDNode *N, SDValue &Lo, SDValue &Hi);
 338   void ExpandIntRes_FP_TO_SINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 339   void ExpandIntRes_FP_TO_UINT        (SDNode *N, SDValue &Lo, SDValue &Hi);
 340
 341   void ExpandIntRes_Logical           (SDNode *N, SDValue &Lo, SDValue &Hi);
 342   void ExpandIntRes_ADDSUB            (SDNode *N, SDValue &Lo, SDValue &Hi);
 343   void ExpandIntRes_ADDSUBC           (SDNode *N, SDValue &Lo, SDValue &Hi);
 344   void ExpandIntRes_ADDSUBE           (SDNode *N, SDValue &Lo, SDValue &Hi);
 345   void ExpandIntRes_BSWAP             (SDNode *N, SDValue &Lo, SDValue &Hi);
 346   void ExpandIntRes_MUL               (SDNode *N, SDValue &Lo, SDValue &Hi);
 347   void ExpandIntRes_SDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 348   void ExpandIntRes_SREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 349   void ExpandIntRes_UDIV              (SDNode *N, SDValue &Lo, SDValue &Hi);
 350   void ExpandIntRes_UREM              (SDNode *N, SDValue &Lo, SDValue &Hi);
 351   void ExpandIntRes_Shift             (SDNode *N, SDValue &Lo, SDValue &Hi);
 352
 353   void ExpandShiftByConstant(SDNode *N, unsigned Amt,
 354                              SDValue &Lo, SDValue &Hi);
 355   bool ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 356   bool ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi);
 357
 358   // Integer Operand Expansion.
 359   bool ExpandIntegerOperand(SDNode *N, unsigned OperandNo);
 360   SDValue ExpandIntOp_BIT_CONVERT(SDNode *N);
 361   SDValue ExpandIntOp_BR_CC(SDNode *N);
 362   SDValue ExpandIntOp_BUILD_VECTOR(SDNode *N);
 363   SDValue ExpandIntOp_EXTRACT_ELEMENT(SDNode *N);
 364   SDValue ExpandIntOp_SELECT_CC(SDNode *N);
 365   SDValue ExpandIntOp_SETCC(SDNode *N);
 366   SDValue ExpandIntOp_Shift(SDNode *N);
 367   SDValue ExpandIntOp_SINT_TO_FP(SDNode *N);
 368   SDValue ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo);
 369   SDValue ExpandIntOp_TRUNCATE(SDNode *N);
 370   SDValue ExpandIntOp_UINT_TO_FP(SDNode *N);
 371
 372   void IntegerExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 373                                   ISD::CondCode &CCCode, DebugLoc dl);
 374
 375   //===--------------------------------------------------------------------===//
 376   // Float to Integer Conversion Support: LegalizeFloatTypes.cpp
 377   //===--------------------------------------------------------------------===//
 378
 379   /// GetSoftenedFloat - Given a processed operand Op which was converted to an
 380   /// integer of the same size, this returns the integer.  The integer contains
 381   /// exactly the same bits as Op - only the type changed.  For example, if Op
 382   /// is an f32 which was softened to an i32, then this method returns an i32,
 383   /// the bits of which coincide with those of Op.
 384   SDValue GetSoftenedFloat(SDValue Op) {
 385     SDValue &SoftenedOp = SoftenedFloats[Op];
 386     RemapValue(SoftenedOp);
 387     assert(SoftenedOp.getNode() && "Operand wasn't converted to integer?");
 388     return SoftenedOp;
 389   }
 390   void SetSoftenedFloat(SDValue Op, SDValue Result);
 391
 392   // Result Float to Integer Conversion.
 393   void SoftenFloatResult(SDNode *N, unsigned OpNo);
 394   SDValue SoftenFloatRes_BIT_CONVERT(SDNode *N);
 395   SDValue SoftenFloatRes_BUILD_PAIR(SDNode *N);
 396   SDValue SoftenFloatRes_ConstantFP(ConstantFPSDNode *N);
 397   SDValue SoftenFloatRes_EXTRACT_VECTOR_ELT(SDNode *N);
 398   SDValue SoftenFloatRes_FABS(SDNode *N);
 399   SDValue SoftenFloatRes_FADD(SDNode *N);
 400   SDValue SoftenFloatRes_FCEIL(SDNode *N);
 401   SDValue SoftenFloatRes_FCOPYSIGN(SDNode *N);
 402   SDValue SoftenFloatRes_FCOS(SDNode *N);
 403   SDValue SoftenFloatRes_FDIV(SDNode *N);
 404   SDValue SoftenFloatRes_FEXP(SDNode *N);
 405   SDValue SoftenFloatRes_FEXP2(SDNode *N);
 406   SDValue SoftenFloatRes_FFLOOR(SDNode *N);
 407   SDValue SoftenFloatRes_FLOG(SDNode *N);
 408   SDValue SoftenFloatRes_FLOG2(SDNode *N);
 409   SDValue SoftenFloatRes_FLOG10(SDNode *N);
 410   SDValue SoftenFloatRes_FMUL(SDNode *N);
 411   SDValue SoftenFloatRes_FNEARBYINT(SDNode *N);
 412   SDValue SoftenFloatRes_FNEG(SDNode *N);
 413   SDValue SoftenFloatRes_FP_EXTEND(SDNode *N);
 414   SDValue SoftenFloatRes_FP_ROUND(SDNode *N);
 415   SDValue SoftenFloatRes_FPOW(SDNode *N);
 416   SDValue SoftenFloatRes_FPOWI(SDNode *N);
 417   SDValue SoftenFloatRes_FREM(SDNode *N);
 418   SDValue SoftenFloatRes_FRINT(SDNode *N);
 419   SDValue SoftenFloatRes_FSIN(SDNode *N);
 420   SDValue SoftenFloatRes_FSQRT(SDNode *N);
 421   SDValue SoftenFloatRes_FSUB(SDNode *N);
 422   SDValue SoftenFloatRes_FTRUNC(SDNode *N);
 423   SDValue SoftenFloatRes_LOAD(SDNode *N);
 424   SDValue SoftenFloatRes_SELECT(SDNode *N);
 425   SDValue SoftenFloatRes_SELECT_CC(SDNode *N);
 426   SDValue SoftenFloatRes_UNDEF(SDNode *N);
 427   SDValue SoftenFloatRes_VAARG(SDNode *N);
 428   SDValue SoftenFloatRes_XINT_TO_FP(SDNode *N);
 429
 430   // Operand Float to Integer Conversion.
 431   bool SoftenFloatOperand(SDNode *N, unsigned OpNo);
 432   SDValue SoftenFloatOp_BIT_CONVERT(SDNode *N);
 433   SDValue SoftenFloatOp_BR_CC(SDNode *N);
 434   SDValue SoftenFloatOp_FP_ROUND(SDNode *N);
 435   SDValue SoftenFloatOp_FP_TO_SINT(SDNode *N);
 436   SDValue SoftenFloatOp_FP_TO_UINT(SDNode *N);
 437   SDValue SoftenFloatOp_SELECT_CC(SDNode *N);
 438   SDValue SoftenFloatOp_SETCC(SDNode *N);
 439   SDValue SoftenFloatOp_STORE(SDNode *N, unsigned OpNo);
 440
 441   void SoftenSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 442                            ISD::CondCode &CCCode, DebugLoc dl);
 443
 444   //===--------------------------------------------------------------------===//
 445   // Float Expansion Support: LegalizeFloatTypes.cpp
 446   //===--------------------------------------------------------------------===//
 447
 448   /// GetExpandedFloat - Given a processed operand Op which was expanded into
 449   /// two floating point values of half the size, this returns the two halves.
 450   /// The low bits of Op are exactly equal to the bits of Lo; the high bits
 451   /// exactly equal Hi.  For example, if Op is a ppcf128 which was expanded
 452   /// into two f64's, then this method returns the two f64's, with Lo being
 453   /// equal to the lower 64 bits of Op, and Hi to the upper 64 bits.
 454   void GetExpandedFloat(SDValue Op, SDValue &Lo, SDValue &Hi);
 455   void SetExpandedFloat(SDValue Op, SDValue Lo, SDValue Hi);
 456
 457   // Float Result Expansion.
 458   void ExpandFloatResult(SDNode *N, unsigned ResNo);
 459   void ExpandFloatRes_ConstantFP(SDNode *N, SDValue &Lo, SDValue &Hi);
 460   void ExpandFloatRes_FABS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 461   void ExpandFloatRes_FADD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 462   void ExpandFloatRes_FCEIL     (SDNode *N, SDValue &Lo, SDValue &Hi);
 463   void ExpandFloatRes_FCOS      (SDNode *N, SDValue &Lo, SDValue &Hi);
 464   void ExpandFloatRes_FDIV      (SDNode *N, SDValue &Lo, SDValue &Hi);
 465   void ExpandFloatRes_FEXP      (SDNode *N, SDValue &Lo, SDValue &Hi);
 466   void ExpandFloatRes_FEXP2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 467   void ExpandFloatRes_FFLOOR    (SDNode *N, SDValue &Lo, SDValue &Hi);
 468   void ExpandFloatRes_FLOG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 469   void ExpandFloatRes_FLOG2     (SDNode *N, SDValue &Lo, SDValue &Hi);
 470   void ExpandFloatRes_FLOG10    (SDNode *N, SDValue &Lo, SDValue &Hi);
 471   void ExpandFloatRes_FMUL      (SDNode *N, SDValue &Lo, SDValue &Hi);
 472   void ExpandFloatRes_FNEARBYINT(SDNode *N, SDValue &Lo, SDValue &Hi);
 473   void ExpandFloatRes_FNEG      (SDNode *N, SDValue &Lo, SDValue &Hi);
 474   void ExpandFloatRes_FP_EXTEND (SDNode *N, SDValue &Lo, SDValue &Hi);
 475   void ExpandFloatRes_FPOW      (SDNode *N, SDValue &Lo, SDValue &Hi);
 476   void ExpandFloatRes_FPOWI     (SDNode *N, SDValue &Lo, SDValue &Hi);
 477   void ExpandFloatRes_FRINT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 478   void ExpandFloatRes_FSIN      (SDNode *N, SDValue &Lo, SDValue &Hi);
 479   void ExpandFloatRes_FSQRT     (SDNode *N, SDValue &Lo, SDValue &Hi);
 480   void ExpandFloatRes_FSUB      (SDNode *N, SDValue &Lo, SDValue &Hi);
 481   void ExpandFloatRes_FTRUNC    (SDNode *N, SDValue &Lo, SDValue &Hi);
 482   void ExpandFloatRes_LOAD      (SDNode *N, SDValue &Lo, SDValue &Hi);
 483   void ExpandFloatRes_XINT_TO_FP(SDNode *N, SDValue &Lo, SDValue &Hi);
 484
 485   // Float Operand Expansion.
 486   bool ExpandFloatOperand(SDNode *N, unsigned OperandNo);
 487   SDValue ExpandFloatOp_BR_CC(SDNode *N);
 488   SDValue ExpandFloatOp_FP_ROUND(SDNode *N);
 489   SDValue ExpandFloatOp_FP_TO_SINT(SDNode *N);
 490   SDValue ExpandFloatOp_FP_TO_UINT(SDNode *N);
 491   SDValue ExpandFloatOp_SELECT_CC(SDNode *N);
 492   SDValue ExpandFloatOp_SETCC(SDNode *N);
 493   SDValue ExpandFloatOp_STORE(SDNode *N, unsigned OpNo);
 494
 495   void FloatExpandSetCCOperands(SDValue &NewLHS, SDValue &NewRHS,
 496                                 ISD::CondCode &CCCode, DebugLoc dl);
 497
 498   //===--------------------------------------------------------------------===//
 499   // Scalarization Support: LegalizeVectorTypes.cpp
 500   //===--------------------------------------------------------------------===//
 501
 502   /// GetScalarizedVector - Given a processed one-element vector Op which was
 503   /// scalarized to its element type, this returns the element.  For example,
 504   /// if Op is a v1i32, Op = < i32 val >, this method returns val, an i32.
 505   SDValue GetScalarizedVector(SDValue Op) {
 506     SDValue &ScalarizedOp = ScalarizedVectors[Op];
 507     RemapValue(ScalarizedOp);
 508     assert(ScalarizedOp.getNode() && "Operand wasn't scalarized?");
 509     return ScalarizedOp;
 510   }
 511   void SetScalarizedVector(SDValue Op, SDValue Result);
 512
 513   // Vector Result Scalarization: <1 x ty> -> ty.
 514   void ScalarizeVectorResult(SDNode *N, unsigned OpNo);
 515   SDValue ScalarizeVecRes_BinOp(SDNode *N);
 516   SDValue ScalarizeVecRes_ShiftOp(SDNode *N);
 517   SDValue ScalarizeVecRes_UnaryOp(SDNode *N);
 518
 519   SDValue ScalarizeVecRes_BIT_CONVERT(SDNode *N);
 520   SDValue ScalarizeVecRes_CONVERT_RNDSAT(SDNode *N);
 521   SDValue ScalarizeVecRes_EXTRACT_SUBVECTOR(SDNode *N);
 522   SDValue ScalarizeVecRes_FPOWI(SDNode *N);
 523   SDValue ScalarizeVecRes_INSERT_VECTOR_ELT(SDNode *N);
 524   SDValue ScalarizeVecRes_LOAD(LoadSDNode *N);
 525   SDValue ScalarizeVecRes_SCALAR_TO_VECTOR(SDNode *N);
 526   SDValue ScalarizeVecRes_SELECT(SDNode *N);
 527   SDValue ScalarizeVecRes_SELECT_CC(SDNode *N);
 528   SDValue ScalarizeVecRes_UNDEF(SDNode *N);
 529   SDValue ScalarizeVecRes_VECTOR_SHUFFLE(SDNode *N);
 530   SDValue ScalarizeVecRes_VSETCC(SDNode *N);
 531
 532   // Vector Operand Scalarization: <1 x ty> -> ty.
 533   bool ScalarizeVectorOperand(SDNode *N, unsigned OpNo);
 534   SDValue ScalarizeVecOp_BIT_CONVERT(SDNode *N);
 535   SDValue ScalarizeVecOp_CONCAT_VECTORS(SDNode *N);
 536   SDValue ScalarizeVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 537   SDValue ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 538
 539   //===--------------------------------------------------------------------===//
 540   // Vector Splitting Support: LegalizeVectorTypes.cpp
 541   //===--------------------------------------------------------------------===//
 542
 543   /// GetSplitVector - Given a processed vector Op which was split into smaller
 544   /// vectors, this method returns the smaller vectors.  The first elements of
 545   /// Op coincide with the elements of Lo; the remaining elements of Op coincide
 546   /// with the elements of Hi: Op is what you would get by concatenating Lo and
 547   /// Hi.  For example, if Op is a v8i32 that was split into two v4i32's, then
 548   /// this method returns the two v4i32's, with Lo corresponding to the first 4
 549   /// elements of Op, and Hi to the last 4 elements.
 550   void GetSplitVector(SDValue Op, SDValue &Lo, SDValue &Hi);
 551   void SetSplitVector(SDValue Op, SDValue Lo, SDValue Hi);
 552
 553   // Vector Result Splitting: <128 x ty> -> 2 x <64 x ty>.
 554   void SplitVectorResult(SDNode *N, unsigned OpNo);
 555   void SplitVecRes_BinOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 556   void SplitVecRes_UnaryOp(SDNode *N, SDValue &Lo, SDValue &Hi);
 557
 558   void SplitVecRes_BIT_CONVERT(SDNode *N, SDValue &Lo, SDValue &Hi);
 559   void SplitVecRes_BUILD_PAIR(SDNode *N, SDValue &Lo, SDValue &Hi);
 560   void SplitVecRes_BUILD_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 561   void SplitVecRes_CONCAT_VECTORS(SDNode *N, SDValue &Lo, SDValue &Hi);
 562   void SplitVecRes_CONVERT_RNDSAT(SDNode *N, SDValue &Lo, SDValue &Hi);
 563   void SplitVecRes_EXTRACT_SUBVECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 564   void SplitVecRes_FPOWI(SDNode *N, SDValue &Lo, SDValue &Hi);
 565   void SplitVecRes_INSERT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 566   void SplitVecRes_LOAD(LoadSDNode *N, SDValue &Lo, SDValue &Hi);
 567   void SplitVecRes_SCALAR_TO_VECTOR(SDNode *N, SDValue &Lo, SDValue &Hi);
 568   void SplitVecRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi);
 569   void SplitVecRes_VECTOR_SHUFFLE(SDNode *N, SDValue &Lo, SDValue &Hi);
 570   void SplitVecRes_VSETCC(SDNode *N, SDValue &Lo, SDValue &Hi);
 571
 572   // Vector Operand Splitting: <128 x ty> -> 2 x <64 x ty>.
 573   bool SplitVectorOperand(SDNode *N, unsigned OpNo);
 574   SDValue SplitVecOp_UnaryOp(SDNode *N);
 575
 576   SDValue SplitVecOp_BIT_CONVERT(SDNode *N);
 577   SDValue SplitVecOp_EXTRACT_SUBVECTOR(SDNode *N);
 578   SDValue SplitVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 579   SDValue SplitVecOp_STORE(StoreSDNode *N, unsigned OpNo);
 580   SDValue SplitVecOp_VECTOR_SHUFFLE(SDNode *N, unsigned OpNo);
 581
 582   //===--------------------------------------------------------------------===//
 583   // Vector Widening Support: LegalizeVectorTypes.cpp
 584   //===--------------------------------------------------------------------===//
 585
 586   /// GetWidenedVector - Given a processed vector Op which was widened into a
 587   /// larger vector, this method returns the larger vector.  The elements of
 588   /// the returned vector consist of the elements of Op followed by elements
 589   /// containing rubbish.  For example, if Op is a v2i32 that was widened to a
 590   /// v4i32, then this method returns a v4i32 for which the first two elements
 591   /// are the same as those of Op, while the last two elements contain rubbish.
 592   SDValue GetWidenedVector(SDValue Op) {
 593     SDValue &WidenedOp = WidenedVectors[Op];
 594     RemapValue(WidenedOp);
 595     assert(WidenedOp.getNode() && "Operand wasn't widened?");
 596     return WidenedOp;
 597   }
 598   void SetWidenedVector(SDValue Op, SDValue Result);
 599
 600   // Widen Vector Result Promotion.
 601   void WidenVectorResult(SDNode *N, unsigned ResNo);
 602   SDValue WidenVecRes_BIT_CONVERT(SDNode* N);
 603   SDValue WidenVecRes_BUILD_VECTOR(SDNode* N);
 604   SDValue WidenVecRes_CONCAT_VECTORS(SDNode* N);
 605   SDValue WidenVecRes_CONVERT_RNDSAT(SDNode* N);
 606   SDValue WidenVecRes_EXTRACT_SUBVECTOR(SDNode* N);
 607   SDValue WidenVecRes_INSERT_VECTOR_ELT(SDNode* N);
 608   SDValue WidenVecRes_LOAD(SDNode* N);
 609   SDValue WidenVecRes_SCALAR_TO_VECTOR(SDNode* N);
 610   SDValue WidenVecRes_SELECT(SDNode* N);
 611   SDValue WidenVecRes_SELECT_CC(SDNode* N);
 612   SDValue WidenVecRes_UNDEF(SDNode *N);
 613   SDValue WidenVecRes_VECTOR_SHUFFLE(SDNode *N);
 614   SDValue WidenVecRes_VSETCC(SDNode* N);
 615
 616   SDValue WidenVecRes_Binary(SDNode *N);
 617   SDValue WidenVecRes_Convert(SDNode *N);
 618   SDValue WidenVecRes_Shift(SDNode *N);
 619   SDValue WidenVecRes_Unary(SDNode *N);
 620
 621   // Widen Vector Operand.
 622   bool WidenVectorOperand(SDNode *N, unsigned ResNo);
 623   SDValue WidenVecOp_BIT_CONVERT(SDNode *N);
 624   SDValue WidenVecOp_CONCAT_VECTORS(SDNode *N);
 625   SDValue WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
 626   SDValue WidenVecOp_STORE(SDNode* N);
 627
 628   SDValue WidenVecOp_Convert(SDNode *N);
 629
 630   //===--------------------------------------------------------------------===//
 631   // Vector Widening Utilities Support: LegalizeVectorTypes.cpp
 632   //===--------------------------------------------------------------------===//
 633
 634   /// Helper genWidenVectorLoads - Helper function to generate a set of
 635   /// loads to load a vector with a resulting wider type. It takes
 636   ///   ExtType: Extension type
 637   ///   LdChain: list of chains for the load we have generated.
 638   ///   Chain:   incoming chain for the ld vector.
 639   ///   BasePtr: base pointer to load from.
 640   ///   SV:         memory disambiguation source value.
 641   ///   SVOffset:   memory disambiugation offset.
 642   ///   Alignment:  alignment of the memory.
 643   ///   isVolatile: volatile load.
 644   ///   LdWidth:    width of memory that we want to load.
 645   ///   ResType:    the wider result result type for the resulting vector.
 646   ///   dl:         DebugLoc to be applied to new nodes
 647   SDValue GenWidenVectorLoads(SmallVector<SDValue, 16>& LdChain, SDValue Chain,
 648                               SDValue BasePtr, const Value *SV,
 649                               int SVOffset, unsigned Alignment,
 650                               bool isVolatile, unsigned LdWidth,
 651                               MVT ResType, DebugLoc dl);
 652
 653   /// Helper genWidenVectorStores - Helper function to generate a set of
 654   /// stores to store a widen vector into non widen memory
 655   /// It takes
 656   ///   StChain: list of chains for the stores we have generated
 657   ///   Chain:   incoming chain for the ld vector
 658   ///   BasePtr: base pointer to load from
 659   ///   SV:      memory disambiguation source value
 660   ///   SVOffset:   memory disambiugation offset
 661   ///   Alignment:  alignment of the memory
 662   ///   isVolatile: volatile lod
 663   ///   ValOp:   value to store
 664   ///   StWidth: width of memory that we want to store
 665   ///   dl:         DebugLoc to be applied to new nodes
 666   void GenWidenVectorStores(SmallVector<SDValue, 16>& StChain, SDValue Chain,
 667                             SDValue BasePtr, const Value *SV,
 668                             int SVOffset, unsigned Alignment,
 669                             bool isVolatile, SDValue ValOp,
 670                             unsigned StWidth, DebugLoc dl);
 671
 672   /// Modifies a vector input (widen or narrows) to a vector of NVT.  The
 673   /// input vector must have the same element type as NVT.
 674   SDValue ModifyToType(SDValue InOp, MVT WidenVT);
 675
 676
 677   //===--------------------------------------------------------------------===//
 678   // Generic Splitting: LegalizeTypesGeneric.cpp
 679   //===--------------------------------------------------------------------===//
 680
 681   // Legalization methods which only use that the illegal type is split into two
 682   // not necessarily identical types.  As such they can be used for splitting
 683   // vectors and expanding integers and floats.
 684
 685   void GetSplitOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 686     if (Op.getValueType().isVector())
 687       GetSplitVector(Op, Lo, Hi);
 688     else if (Op.getValueType().isInteger())
 689       GetExpandedInteger(Op, Lo, Hi);
 690     else
 691       GetExpandedFloat(Op, Lo, Hi);
 692   }
 693
 694   /// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
 695   /// which is split (or expanded) into two not necessarily identical pieces.
 696   void GetSplitDestVTs(MVT InVT, MVT &LoVT, MVT &HiVT);
 697
 698   // Generic Result Splitting.
 699   void SplitRes_MERGE_VALUES(SDNode *N, SDValue &Lo, SDValue &Hi);
 700   void SplitRes_SELECT      (SDNode *N, SDValue &Lo, SDValue &Hi);
 701   void SplitRes_SELECT_CC   (SDNode *N, SDValue &Lo, SDValue &Hi);
 702   void SplitRes_UNDEF       (SDNode *N, SDValue &Lo, SDValue &Hi);
 703
 704   //===--------------------------------------------------------------------===//
 705   // Generic Expansion: LegalizeTypesGeneric.cpp
 706   //===--------------------------------------------------------------------===//
 707
 708   // Legalization methods which only use that the illegal type is split into two
 709   // identical types of half the size, and that the Lo/Hi part is stored first
 710   // in memory on little/big-endian machines, followed by the Hi/Lo part.  As
 711   // such they can be used for expanding integers and floats.
 712
 713   void GetExpandedOp(SDValue Op, SDValue &Lo, SDValue &Hi) {
 714     if (Op.getValueType().isInteger())
 715       GetExpandedInteger(Op, Lo, Hi);
 716     else
 717       GetExpandedFloat(Op, Lo, Hi);
 718   }
 719
 720   // Generic Result Expansion.
 721   void ExpandRes_BIT_CONVERT       (SDNode *N, SDValue &Lo, SDValue &Hi);
 722   void ExpandRes_BUILD_PAIR        (SDNode *N, SDValue &Lo, SDValue &Hi);
 723   void ExpandRes_EXTRACT_ELEMENT   (SDNode *N, SDValue &Lo, SDValue &Hi);
 724   void ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo, SDValue &Hi);
 725   void ExpandRes_NormalLoad        (SDNode *N, SDValue &Lo, SDValue &Hi);
 726   void ExpandRes_VAARG             (SDNode *N, SDValue &Lo, SDValue &Hi);
 727
 728   // Generic Operand Expansion.
 729   SDValue ExpandOp_BIT_CONVERT      (SDNode *N);
 730   SDValue ExpandOp_BUILD_VECTOR     (SDNode *N);
 731   SDValue ExpandOp_EXTRACT_ELEMENT  (SDNode *N);
 732   SDValue ExpandOp_INSERT_VECTOR_ELT(SDNode *N);
 733   SDValue ExpandOp_SCALAR_TO_VECTOR (SDNode *N);
 734   SDValue ExpandOp_NormalStore      (SDNode *N, unsigned OpNo);
 735 };
 736
 737 } // end namespace llvm.
 738
 739 #endif