SelectionDAG.h revision f5d9789a7fddc9173cee104c8f25a7564bad3f28
1//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===// 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 declares the SelectionDAG class, and transitively defines the 11// SDNode class and subclasses. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef LLVM_CODEGEN_SELECTIONDAG_H 16#define LLVM_CODEGEN_SELECTIONDAG_H 17 18#include "llvm/ADT/ilist.h" 19#include "llvm/ADT/DenseSet.h" 20#include "llvm/ADT/FoldingSet.h" 21#include "llvm/ADT/StringMap.h" 22#include "llvm/CodeGen/SelectionDAGNodes.h" 23 24#include <cassert> 25#include <vector> 26#include <map> 27#include <string> 28 29namespace llvm { 30 31class AliasAnalysis; 32class TargetLowering; 33class TargetMachine; 34class MachineModuleInfo; 35class DwarfWriter; 36class MachineFunction; 37class MachineConstantPoolValue; 38class FunctionLoweringInfo; 39 40template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> { 41private: 42 mutable SDNode Sentinel; 43public: 44 ilist_traits() : Sentinel(ISD::DELETED_NODE, SDVTList()) {} 45 46 SDNode *createSentinel() const { 47 return &Sentinel; 48 } 49 static void destroySentinel(SDNode *) {} 50 51 static void deleteNode(SDNode *) { 52 assert(0 && "ilist_traits<SDNode> shouldn't see a deleteNode call!"); 53 } 54private: 55 static void createNode(const SDNode &); 56}; 57 58enum CombineLevel { 59 Unrestricted, // Combine may create illegal operations and illegal types. 60 NoIllegalTypes, // Combine may create illegal operations but no illegal types. 61 NoIllegalOperations // Combine may only create legal operations and types. 62}; 63 64/// SelectionDAG class - This is used to represent a portion of an LLVM function 65/// in a low-level Data Dependence DAG representation suitable for instruction 66/// selection. This DAG is constructed as the first step of instruction 67/// selection in order to allow implementation of machine specific optimizations 68/// and code simplifications. 69/// 70/// The representation used by the SelectionDAG is a target-independent 71/// representation, which has some similarities to the GCC RTL representation, 72/// but is significantly more simple, powerful, and is a graph form instead of a 73/// linear form. 74/// 75class SelectionDAG { 76 TargetLowering &TLI; 77 MachineFunction *MF; 78 FunctionLoweringInfo &FLI; 79 MachineModuleInfo *MMI; 80 DwarfWriter *DW; 81 82 /// EntryNode - The starting token. 83 SDNode EntryNode; 84 85 /// Root - The root of the entire DAG. 86 SDValue Root; 87 88 /// AllNodes - A linked list of nodes in the current DAG. 89 ilist<SDNode> AllNodes; 90 91 /// NodeAllocatorType - The AllocatorType for allocating SDNodes. We use 92 /// pool allocation with recycling. 93 typedef RecyclingAllocator<BumpPtrAllocator, SDNode, sizeof(LargestSDNode), 94 AlignOf<MostAlignedSDNode>::Alignment> 95 NodeAllocatorType; 96 97 /// NodeAllocator - Pool allocation for nodes. 98 NodeAllocatorType NodeAllocator; 99 100 /// CSEMap - This structure is used to memoize nodes, automatically performing 101 /// CSE with existing nodes with a duplicate is requested. 102 FoldingSet<SDNode> CSEMap; 103 104 /// OperandAllocator - Pool allocation for machine-opcode SDNode operands. 105 BumpPtrAllocator OperandAllocator; 106 107 /// Allocator - Pool allocation for misc. objects that are created once per 108 /// SelectionDAG. 109 BumpPtrAllocator Allocator; 110 111 /// VerifyNode - Sanity check the given node. Aborts if it is invalid. 112 void VerifyNode(SDNode *N); 113 114 /// setGraphColorHelper - Implementation of setSubgraphColor. 115 /// Return whether we had to truncate the search. 116 /// 117 bool setSubgraphColorHelper(SDNode *N, const char *Color, DenseSet<SDNode *> &visited, 118 int level, bool &printed); 119 120public: 121 SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli); 122 ~SelectionDAG(); 123 124 /// init - Prepare this SelectionDAG to process code in the given 125 /// MachineFunction. 126 /// 127 void init(MachineFunction &mf, MachineModuleInfo *mmi, DwarfWriter *dw); 128 129 /// clear - Clear state and free memory necessary to make this 130 /// SelectionDAG ready to process a new block. 131 /// 132 void clear(); 133 134 MachineFunction &getMachineFunction() const { return *MF; } 135 const TargetMachine &getTarget() const; 136 TargetLowering &getTargetLoweringInfo() const { return TLI; } 137 FunctionLoweringInfo &getFunctionLoweringInfo() const { return FLI; } 138 MachineModuleInfo *getMachineModuleInfo() const { return MMI; } 139 DwarfWriter *getDwarfWriter() const { return DW; } 140 141 /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'. 142 /// 143 void viewGraph(const std::string &Title); 144 void viewGraph(); 145 146#ifndef NDEBUG 147 std::map<const SDNode *, std::string> NodeGraphAttrs; 148#endif 149 150 /// clearGraphAttrs - Clear all previously defined node graph attributes. 151 /// Intended to be used from a debugging tool (eg. gdb). 152 void clearGraphAttrs(); 153 154 /// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".) 155 /// 156 void setGraphAttrs(const SDNode *N, const char *Attrs); 157 158 /// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".) 159 /// Used from getNodeAttributes. 160 const std::string getGraphAttrs(const SDNode *N) const; 161 162 /// setGraphColor - Convenience for setting node color attribute. 163 /// 164 void setGraphColor(const SDNode *N, const char *Color); 165 166 /// setGraphColor - Convenience for setting subgraph color attribute. 167 /// 168 void setSubgraphColor(SDNode *N, const char *Color); 169 170 typedef ilist<SDNode>::const_iterator allnodes_const_iterator; 171 allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); } 172 allnodes_const_iterator allnodes_end() const { return AllNodes.end(); } 173 typedef ilist<SDNode>::iterator allnodes_iterator; 174 allnodes_iterator allnodes_begin() { return AllNodes.begin(); } 175 allnodes_iterator allnodes_end() { return AllNodes.end(); } 176 ilist<SDNode>::size_type allnodes_size() const { 177 return AllNodes.size(); 178 } 179 180 /// getRoot - Return the root tag of the SelectionDAG. 181 /// 182 const SDValue &getRoot() const { return Root; } 183 184 /// getEntryNode - Return the token chain corresponding to the entry of the 185 /// function. 186 SDValue getEntryNode() const { 187 return SDValue(const_cast<SDNode *>(&EntryNode), 0); 188 } 189 190 /// setRoot - Set the current root tag of the SelectionDAG. 191 /// 192 const SDValue &setRoot(SDValue N) { 193 assert((!N.getNode() || N.getValueType() == MVT::Other) && 194 "DAG root value is not a chain!"); 195 return Root = N; 196 } 197 198 /// Combine - This iterates over the nodes in the SelectionDAG, folding 199 /// certain types of nodes together, or eliminating superfluous nodes. The 200 /// Level argument controls whether Combine is allowed to produce nodes and 201 /// types that are illegal on the target. 202 void Combine(CombineLevel Level, AliasAnalysis &AA, bool Fast); 203 204 /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that 205 /// only uses types natively supported by the target. Returns "true" if it 206 /// made any changes. 207 /// 208 /// Note that this is an involved process that may invalidate pointers into 209 /// the graph. 210 bool LegalizeTypes(); 211 212 /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is 213 /// compatible with the target instruction selector, as indicated by the 214 /// TargetLowering object. 215 /// 216 /// Note that this is an involved process that may invalidate pointers into 217 /// the graph. 218 void Legalize(bool TypesNeedLegalizing); 219 220 /// RemoveDeadNodes - This method deletes all unreachable nodes in the 221 /// SelectionDAG. 222 void RemoveDeadNodes(); 223 224 /// DeleteNode - Remove the specified node from the system. This node must 225 /// have no referrers. 226 void DeleteNode(SDNode *N); 227 228 /// getVTList - Return an SDVTList that represents the list of values 229 /// specified. 230 SDVTList getVTList(MVT VT); 231 SDVTList getVTList(MVT VT1, MVT VT2); 232 SDVTList getVTList(MVT VT1, MVT VT2, MVT VT3); 233 SDVTList getVTList(MVT VT1, MVT VT2, MVT VT3, MVT VT4); 234 SDVTList getVTList(const MVT *VTs, unsigned NumVTs); 235 236 /// getNodeValueTypes - These are obsolete, use getVTList instead. 237 const MVT *getNodeValueTypes(MVT VT) { 238 return getVTList(VT).VTs; 239 } 240 const MVT *getNodeValueTypes(MVT VT1, MVT VT2) { 241 return getVTList(VT1, VT2).VTs; 242 } 243 const MVT *getNodeValueTypes(MVT VT1, MVT VT2, MVT VT3) { 244 return getVTList(VT1, VT2, VT3).VTs; 245 } 246 const MVT *getNodeValueTypes(MVT VT1, MVT VT2, MVT VT3, MVT VT4) { 247 return getVTList(VT1, VT2, VT3, VT4).VTs; 248 } 249 const MVT *getNodeValueTypes(const std::vector<MVT> &vtList) { 250 return getVTList(&vtList[0], (unsigned)vtList.size()).VTs; 251 } 252 253 254 //===--------------------------------------------------------------------===// 255 // Node creation methods. 256 // 257 SDValue getConstant(uint64_t Val, MVT VT, bool isTarget = false); 258 SDValue getConstant(const APInt &Val, MVT VT, bool isTarget = false); 259 SDValue getConstant(const ConstantInt &Val, MVT VT, bool isTarget = false); 260 SDValue getIntPtrConstant(uint64_t Val, bool isTarget = false); 261 SDValue getTargetConstant(uint64_t Val, MVT VT) { 262 return getConstant(Val, VT, true); 263 } 264 SDValue getTargetConstant(const APInt &Val, MVT VT) { 265 return getConstant(Val, VT, true); 266 } 267 SDValue getTargetConstant(const ConstantInt &Val, MVT VT) { 268 return getConstant(Val, VT, true); 269 } 270 SDValue getConstantFP(double Val, MVT VT, bool isTarget = false); 271 SDValue getConstantFP(const APFloat& Val, MVT VT, bool isTarget = false); 272 SDValue getConstantFP(const ConstantFP &CF, MVT VT, bool isTarget = false); 273 SDValue getTargetConstantFP(double Val, MVT VT) { 274 return getConstantFP(Val, VT, true); 275 } 276 SDValue getTargetConstantFP(const APFloat& Val, MVT VT) { 277 return getConstantFP(Val, VT, true); 278 } 279 SDValue getTargetConstantFP(const ConstantFP &Val, MVT VT) { 280 return getConstantFP(Val, VT, true); 281 } 282 SDValue getGlobalAddress(const GlobalValue *GV, MVT VT, 283 int64_t offset = 0, bool isTargetGA = false); 284 SDValue getTargetGlobalAddress(const GlobalValue *GV, MVT VT, 285 int64_t offset = 0) { 286 return getGlobalAddress(GV, VT, offset, true); 287 } 288 SDValue getFrameIndex(int FI, MVT VT, bool isTarget = false); 289 SDValue getTargetFrameIndex(int FI, MVT VT) { 290 return getFrameIndex(FI, VT, true); 291 } 292 SDValue getJumpTable(int JTI, MVT VT, bool isTarget = false); 293 SDValue getTargetJumpTable(int JTI, MVT VT) { 294 return getJumpTable(JTI, VT, true); 295 } 296 SDValue getConstantPool(Constant *C, MVT VT, 297 unsigned Align = 0, int Offs = 0, bool isT=false); 298 SDValue getTargetConstantPool(Constant *C, MVT VT, 299 unsigned Align = 0, int Offset = 0) { 300 return getConstantPool(C, VT, Align, Offset, true); 301 } 302 SDValue getConstantPool(MachineConstantPoolValue *C, MVT VT, 303 unsigned Align = 0, int Offs = 0, bool isT=false); 304 SDValue getTargetConstantPool(MachineConstantPoolValue *C, 305 MVT VT, unsigned Align = 0, 306 int Offset = 0) { 307 return getConstantPool(C, VT, Align, Offset, true); 308 } 309 // When generating a branch to a BB, we don't in general know enough 310 // to provide debug info for the BB at that time, so keep this one around. 311 SDValue getBasicBlock(MachineBasicBlock *MBB); 312 SDValue getBasicBlock(MachineBasicBlock *MBB, DebugLoc dl); 313 SDValue getExternalSymbol(const char *Sym, MVT VT); 314 SDValue getExternalSymbol(const char *Sym, DebugLoc dl, MVT VT); 315 SDValue getTargetExternalSymbol(const char *Sym, MVT VT); 316 SDValue getTargetExternalSymbol(const char *Sym, DebugLoc dl, MVT VT); 317 SDValue getArgFlags(ISD::ArgFlagsTy Flags); 318 SDValue getValueType(MVT); 319 SDValue getRegister(unsigned Reg, MVT VT); 320 SDValue getDbgStopPoint(SDValue Root, unsigned Line, unsigned Col, 321 Value *CU); 322 SDValue getLabel(unsigned Opcode, DebugLoc dl, SDValue Root, 323 unsigned LabelID); 324 325 SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N) { 326 return getNode(ISD::CopyToReg, MVT::Other, Chain, 327 getRegister(Reg, N.getValueType()), N); 328 } 329 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N) { 330 return getNode(ISD::CopyToReg, dl, MVT::Other, Chain, 331 getRegister(Reg, N.getValueType()), N); 332 } 333 334 // This version of the getCopyToReg method takes an extra operand, which 335 // indicates that there is potentially an incoming flag value (if Flag is not 336 // null) and that there should be a flag result. 337 SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N, 338 SDValue Flag) { 339 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 340 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag }; 341 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 342 } 343 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N, 344 SDValue Flag) { 345 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 346 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag }; 347 return getNode(ISD::CopyToReg, dl, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 348 } 349 350 // Similar to last getCopyToReg() except parameter Reg is a SDValue 351 SDValue getCopyToReg(SDValue Chain, SDValue Reg, SDValue N, 352 SDValue Flag) { 353 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 354 SDValue Ops[] = { Chain, Reg, N, Flag }; 355 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 356 } 357 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, SDValue Reg, SDValue N, 358 SDValue Flag) { 359 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 360 SDValue Ops[] = { Chain, Reg, N, Flag }; 361 return getNode(ISD::CopyToReg, dl, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 362 } 363 364 SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT) { 365 const MVT *VTs = getNodeValueTypes(VT, MVT::Other); 366 SDValue Ops[] = { Chain, getRegister(Reg, VT) }; 367 return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2); 368 } 369 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, MVT VT) { 370 const MVT *VTs = getNodeValueTypes(VT, MVT::Other); 371 SDValue Ops[] = { Chain, getRegister(Reg, VT) }; 372 return getNode(ISD::CopyFromReg, dl, VTs, 2, Ops, 2); 373 } 374 375 // This version of the getCopyFromReg method takes an extra operand, which 376 // indicates that there is potentially an incoming flag value (if Flag is not 377 // null) and that there should be a flag result. 378 SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT, 379 SDValue Flag) { 380 const MVT *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag); 381 SDValue Ops[] = { Chain, getRegister(Reg, VT), Flag }; 382 return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.getNode() ? 3 : 2); 383 } 384 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, MVT VT, 385 SDValue Flag) { 386 const MVT *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag); 387 SDValue Ops[] = { Chain, getRegister(Reg, VT), Flag }; 388 return getNode(ISD::CopyFromReg, dl, VTs, 3, Ops, Flag.getNode() ? 3 : 2); 389 } 390 391 SDValue getCondCode(ISD::CondCode Cond); 392 393 /// Returns the ConvertRndSat Note: Avoid using this node because it may 394 /// disappear in the future and most targets don't support it. 395 SDValue getConvertRndSat(MVT VT, DebugLoc dl, SDValue Val, SDValue DTy, 396 SDValue STy, 397 SDValue Rnd, SDValue Sat, ISD::CvtCode Code); 398 399 /// getZeroExtendInReg - Return the expression required to zero extend the Op 400 /// value assuming it was the smaller SrcTy value. 401 SDValue getZeroExtendInReg(SDValue Op, MVT SrcTy); 402 SDValue getZeroExtendInReg(SDValue Op, DebugLoc DL, MVT SrcTy); 403 404 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1). 405 SDValue getNOT(DebugLoc DL, SDValue Val, MVT VT); 406 407 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have 408 /// a flag result (to ensure it's not CSE'd). 409 SDValue getCALLSEQ_START(SDValue Chain, SDValue Op) { 410 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 411 SDValue Ops[] = { Chain, Op }; 412 return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2); 413 } 414 415 /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a 416 /// flag result (to ensure it's not CSE'd). 417 SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2, 418 SDValue InFlag) { 419 SDVTList NodeTys = getVTList(MVT::Other, MVT::Flag); 420 SmallVector<SDValue, 4> Ops; 421 Ops.push_back(Chain); 422 Ops.push_back(Op1); 423 Ops.push_back(Op2); 424 Ops.push_back(InFlag); 425 return getNode(ISD::CALLSEQ_END, NodeTys, &Ops[0], 426 (unsigned)Ops.size() - (InFlag.getNode() == 0 ? 1 : 0)); 427 } 428 429 /// getNode - Gets or creates the specified node. 430 /// 431 SDValue getNode(unsigned Opcode, MVT VT); 432 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT); 433 SDValue getNode(unsigned Opcode, MVT VT, SDValue N); 434 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N); 435 SDValue getNode(unsigned Opcode, MVT VT, SDValue N1, SDValue N2); 436 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N1, SDValue N2); 437 SDValue getNode(unsigned Opcode, MVT VT, 438 SDValue N1, SDValue N2, SDValue N3); 439 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 440 SDValue N1, SDValue N2, SDValue N3); 441 SDValue getNode(unsigned Opcode, MVT VT, 442 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 443 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 444 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 445 SDValue getNode(unsigned Opcode, MVT VT, 446 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 447 SDValue N5); 448 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 449 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 450 SDValue N5); 451 SDValue getNode(unsigned Opcode, MVT VT, 452 const SDUse *Ops, unsigned NumOps); 453 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 454 const SDUse *Ops, unsigned NumOps); 455 SDValue getNode(unsigned Opcode, MVT VT, 456 const SDValue *Ops, unsigned NumOps); 457 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 458 const SDValue *Ops, unsigned NumOps); 459 SDValue getNode(unsigned Opcode, const std::vector<MVT> &ResultTys, 460 const SDValue *Ops, unsigned NumOps); 461 SDValue getNode(unsigned Opcode, DebugLoc DL, 462 const std::vector<MVT> &ResultTys, 463 const SDValue *Ops, unsigned NumOps); 464 SDValue getNode(unsigned Opcode, const MVT *VTs, unsigned NumVTs, 465 const SDValue *Ops, unsigned NumOps); 466 SDValue getNode(unsigned Opcode, DebugLoc DL, const MVT *VTs, unsigned NumVTs, 467 const SDValue *Ops, unsigned NumOps); 468 SDValue getNode(unsigned Opcode, SDVTList VTs, 469 const SDValue *Ops, unsigned NumOps); 470 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 471 const SDValue *Ops, unsigned NumOps); 472 473 SDValue getNode(unsigned Opcode, SDVTList VTs); 474 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs); 475 SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N); 476 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, SDValue N); 477 SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N1, SDValue N2); 478 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 479 SDValue N1, SDValue N2); 480 SDValue getNode(unsigned Opcode, SDVTList VTs, 481 SDValue N1, SDValue N2, SDValue N3); 482 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 483 SDValue N1, SDValue N2, SDValue N3); 484 SDValue getNode(unsigned Opcode, SDVTList VTs, 485 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 486 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 487 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 488 SDValue getNode(unsigned Opcode, SDVTList VTs, 489 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 490 SDValue N5); 491 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 492 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 493 SDValue N5); 494 495 SDValue getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 496 SDValue Size, unsigned Align, bool AlwaysInline, 497 const Value *DstSV, uint64_t DstSVOff, 498 const Value *SrcSV, uint64_t SrcSVOff); 499 500 SDValue getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 501 SDValue Size, unsigned Align, 502 const Value *DstSV, uint64_t DstOSVff, 503 const Value *SrcSV, uint64_t SrcSVOff); 504 505 SDValue getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 506 SDValue Size, unsigned Align, 507 const Value *DstSV, uint64_t DstSVOff); 508 509 /// getSetCC - Helper function to make it easier to build SetCC's if you just 510 /// have an ISD::CondCode instead of an SDValue. 511 /// 512 SDValue getSetCC(DebugLoc DL, MVT VT, SDValue LHS, SDValue RHS, 513 ISD::CondCode Cond) { 514 return getNode(ISD::SETCC, DL, VT, LHS, RHS, getCondCode(Cond)); 515 } 516 517 /// getVSetCC - Helper function to make it easier to build VSetCC's nodes 518 /// if you just have an ISD::CondCode instead of an SDValue. 519 /// 520 SDValue getVSetCC(DebugLoc DL, MVT VT, SDValue LHS, SDValue RHS, 521 ISD::CondCode Cond) { 522 return getNode(ISD::VSETCC, DL, VT, LHS, RHS, getCondCode(Cond)); 523 } 524 525 /// getSelectCC - Helper function to make it easier to build SelectCC's if you 526 /// just have an ISD::CondCode instead of an SDValue. 527 /// 528 SDValue getSelectCC(DebugLoc DL, SDValue LHS, SDValue RHS, 529 SDValue True, SDValue False, ISD::CondCode Cond) { 530 return getNode(ISD::SELECT_CC, DL, True.getValueType(), 531 LHS, RHS, True, False, getCondCode(Cond)); 532 } 533 534 /// getVAArg - VAArg produces a result and token chain, and takes a pointer 535 /// and a source value as input. 536 SDValue getVAArg(MVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr, 537 SDValue SV); 538 539 /// getAtomic - Gets a node for an atomic op, produces result and chain and 540 /// takes 3 operands 541 SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain, 542 SDValue Ptr, SDValue Cmp, SDValue Swp, const Value* PtrVal, 543 unsigned Alignment=0); 544 545 /// getAtomic - Gets a node for an atomic op, produces result and chain and 546 /// takes 2 operands. 547 SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain, 548 SDValue Ptr, SDValue Val, const Value* PtrVal, 549 unsigned Alignment = 0); 550 551 /// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a 552 /// result and takes a list of operands. 553 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, 554 const MVT *VTs, unsigned NumVTs, 555 const SDValue *Ops, unsigned NumOps, 556 MVT MemVT, const Value *srcValue, int SVOff, 557 unsigned Align = 0, bool Vol = false, 558 bool ReadMem = true, bool WriteMem = true); 559 560 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList, 561 const SDValue *Ops, unsigned NumOps, 562 MVT MemVT, const Value *srcValue, int SVOff, 563 unsigned Align = 0, bool Vol = false, 564 bool ReadMem = true, bool WriteMem = true); 565 566 /// getMergeValues - Create a MERGE_VALUES node from the given operands. 567 SDValue getMergeValues(const SDValue *Ops, unsigned NumOps); 568 SDValue getMergeValues(const SDValue *Ops, unsigned NumOps, DebugLoc dl); 569 570 /// getCall - Create a CALL node from the given information. 571 /// 572 SDValue getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs, 573 bool IsTailCall, bool isInreg, SDVTList VTs, 574 const SDValue *Operands, unsigned NumOperands); 575 576 /// getLoad - Loads are not normal binary operators: their result type is not 577 /// determined by their operands, and they produce a value AND a token chain. 578 /// 579 SDValue getLoad(MVT VT, SDValue Chain, SDValue Ptr, 580 const Value *SV, int SVOffset, bool isVolatile=false, 581 unsigned Alignment=0); 582 SDValue getLoad(MVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr, 583 const Value *SV, int SVOffset, bool isVolatile=false, 584 unsigned Alignment=0); 585 SDValue getExtLoad(ISD::LoadExtType ExtType, MVT VT, 586 SDValue Chain, SDValue Ptr, const Value *SV, 587 int SVOffset, MVT EVT, bool isVolatile=false, 588 unsigned Alignment=0); 589 SDValue getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, MVT VT, 590 SDValue Chain, SDValue Ptr, const Value *SV, 591 int SVOffset, MVT EVT, bool isVolatile=false, 592 unsigned Alignment=0); 593 SDValue getIndexedLoad(SDValue OrigLoad, SDValue Base, 594 SDValue Offset, ISD::MemIndexedMode AM); 595 SDValue getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base, 596 SDValue Offset, ISD::MemIndexedMode AM); 597 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, 598 MVT VT, SDValue Chain, 599 SDValue Ptr, SDValue Offset, 600 const Value *SV, int SVOffset, MVT EVT, 601 bool isVolatile=false, unsigned Alignment=0); 602 SDValue getLoad(ISD::MemIndexedMode AM, DebugLoc dl, ISD::LoadExtType ExtType, 603 MVT VT, SDValue Chain, 604 SDValue Ptr, SDValue Offset, 605 const Value *SV, int SVOffset, MVT EVT, 606 bool isVolatile=false, unsigned Alignment=0); 607 608 /// getStore - Helper function to build ISD::STORE nodes. 609 /// 610 SDValue getStore(SDValue Chain, SDValue Val, SDValue Ptr, 611 const Value *SV, int SVOffset, bool isVolatile=false, 612 unsigned Alignment=0); 613 SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr, 614 const Value *SV, int SVOffset, bool isVolatile=false, 615 unsigned Alignment=0); 616 SDValue getTruncStore(SDValue Chain, SDValue Val, SDValue Ptr, 617 const Value *SV, int SVOffset, MVT TVT, 618 bool isVolatile=false, unsigned Alignment=0); 619 SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr, 620 const Value *SV, int SVOffset, MVT TVT, 621 bool isVolatile=false, unsigned Alignment=0); 622 SDValue getIndexedStore(SDValue OrigStoe, SDValue Base, 623 SDValue Offset, ISD::MemIndexedMode AM); 624 SDValue getIndexedStore(SDValue OrigStoe, DebugLoc dl, SDValue Base, 625 SDValue Offset, ISD::MemIndexedMode AM); 626 627 /// getSrcValue - Construct a node to track a Value* through the backend. 628 SDValue getSrcValue(const Value *v); 629 630 /// getMemOperand - Construct a node to track a memory reference 631 /// through the backend. 632 SDValue getMemOperand(const MachineMemOperand &MO); 633 634 /// getShiftAmountOperand - Return the specified value casted to 635 /// the target's desired shift amount type. 636 SDValue getShiftAmountOperand(SDValue Op); 637 638 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the 639 /// specified operands. If the resultant node already exists in the DAG, 640 /// this does not modify the specified node, instead it returns the node that 641 /// already exists. If the resultant node does not exist in the DAG, the 642 /// input node is returned. As a degenerate case, if you specify the same 643 /// input operands as the node already has, the input node is returned. 644 SDValue UpdateNodeOperands(SDValue N, SDValue Op); 645 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2); 646 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 647 SDValue Op3); 648 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 649 SDValue Op3, SDValue Op4); 650 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 651 SDValue Op3, SDValue Op4, SDValue Op5); 652 SDValue UpdateNodeOperands(SDValue N, 653 const SDValue *Ops, unsigned NumOps); 654 655 /// SelectNodeTo - These are used for target selectors to *mutate* the 656 /// specified node to have the specified return type, Target opcode, and 657 /// operands. Note that target opcodes are stored as 658 /// ~TargetOpcode in the node opcode field. The resultant node is returned. 659 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT); 660 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, SDValue Op1); 661 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 662 SDValue Op1, SDValue Op2); 663 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 664 SDValue Op1, SDValue Op2, SDValue Op3); 665 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 666 const SDValue *Ops, unsigned NumOps); 667 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, MVT VT2); 668 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 669 MVT VT2, const SDValue *Ops, unsigned NumOps); 670 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 671 MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps); 672 SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, MVT VT1, 673 MVT VT2, MVT VT3, MVT VT4, const SDValue *Ops, 674 unsigned NumOps); 675 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 676 MVT VT2, SDValue Op1); 677 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 678 MVT VT2, SDValue Op1, SDValue Op2); 679 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 680 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 681 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 682 MVT VT2, MVT VT3, SDValue Op1, SDValue Op2, SDValue Op3); 683 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs, 684 const SDValue *Ops, unsigned NumOps); 685 686 /// MorphNodeTo - These *mutate* the specified node to have the specified 687 /// return type, opcode, and operands. 688 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT); 689 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, SDValue Op1); 690 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 691 SDValue Op1, SDValue Op2); 692 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 693 SDValue Op1, SDValue Op2, SDValue Op3); 694 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 695 const SDValue *Ops, unsigned NumOps); 696 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, MVT VT2); 697 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 698 MVT VT2, const SDValue *Ops, unsigned NumOps); 699 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 700 MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps); 701 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 702 MVT VT2, SDValue Op1); 703 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 704 MVT VT2, SDValue Op1, SDValue Op2); 705 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 706 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 707 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs, 708 const SDValue *Ops, unsigned NumOps); 709 710 /// getTargetNode - These are used for target selectors to create a new node 711 /// with specified return type(s), target opcode, and operands. 712 /// 713 /// Note that getTargetNode returns the resultant node. If there is already a 714 /// node of the specified opcode and operands, it returns that node instead of 715 /// the current one. 716 SDNode *getTargetNode(unsigned Opcode, MVT VT); 717 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT); 718 719 SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1); 720 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, SDValue Op1); 721 722 SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1, SDValue Op2); 723 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, SDValue Op1, 724 SDValue Op2); 725 726 SDNode *getTargetNode(unsigned Opcode, MVT VT, 727 SDValue Op1, SDValue Op2, SDValue Op3); 728 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 729 SDValue Op1, SDValue Op2, SDValue Op3); 730 731 SDNode *getTargetNode(unsigned Opcode, MVT VT, 732 const SDValue *Ops, unsigned NumOps); 733 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 734 const SDValue *Ops, unsigned NumOps); 735 736 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2); 737 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2); 738 739 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, SDValue Op1); 740 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, 741 SDValue Op1); 742 743 SDNode *getTargetNode(unsigned Opcode, MVT VT1, 744 MVT VT2, SDValue Op1, SDValue Op2); 745 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 746 MVT VT2, SDValue Op1, SDValue Op2); 747 748 SDNode *getTargetNode(unsigned Opcode, MVT VT1, 749 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 750 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 751 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 752 753 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, 754 const SDValue *Ops, unsigned NumOps); 755 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, 756 const SDValue *Ops, unsigned NumOps); 757 758 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 759 SDValue Op1, SDValue Op2); 760 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 761 SDValue Op1, SDValue Op2); 762 763 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 764 SDValue Op1, SDValue Op2, SDValue Op3); 765 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 766 SDValue Op1, SDValue Op2, SDValue Op3); 767 768 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 769 const SDValue *Ops, unsigned NumOps); 770 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 771 const SDValue *Ops, unsigned NumOps); 772 773 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, MVT VT4, 774 const SDValue *Ops, unsigned NumOps); 775 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 776 MVT VT4, const SDValue *Ops, unsigned NumOps); 777 778 SDNode *getTargetNode(unsigned Opcode, const std::vector<MVT> &ResultTys, 779 const SDValue *Ops, unsigned NumOps); 780 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, 781 const std::vector<MVT> &ResultTys, const SDValue *Ops, 782 unsigned NumOps); 783 784 /// getNodeIfExists - Get the specified node if it's already available, or 785 /// else return NULL. 786 SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs, 787 const SDValue *Ops, unsigned NumOps); 788 789 /// DAGUpdateListener - Clients of various APIs that cause global effects on 790 /// the DAG can optionally implement this interface. This allows the clients 791 /// to handle the various sorts of updates that happen. 792 class DAGUpdateListener { 793 public: 794 virtual ~DAGUpdateListener(); 795 796 /// NodeDeleted - The node N that was deleted and, if E is not null, an 797 /// equivalent node E that replaced it. 798 virtual void NodeDeleted(SDNode *N, SDNode *E) = 0; 799 800 /// NodeUpdated - The node N that was updated. 801 virtual void NodeUpdated(SDNode *N) = 0; 802 }; 803 804 /// RemoveDeadNode - Remove the specified node from the system. If any of its 805 /// operands then becomes dead, remove them as well. Inform UpdateListener 806 /// for each node deleted. 807 void RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener = 0); 808 809 /// RemoveDeadNodes - This method deletes the unreachable nodes in the 810 /// given list, and any nodes that become unreachable as a result. 811 void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes, 812 DAGUpdateListener *UpdateListener = 0); 813 814 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 815 /// This can cause recursive merging of nodes in the DAG. Use the first 816 /// version if 'From' is known to have a single result, use the second 817 /// if you have two nodes with identical results, use the third otherwise. 818 /// 819 /// These methods all take an optional UpdateListener, which (if not null) is 820 /// informed about nodes that are deleted and modified due to recursive 821 /// changes in the dag. 822 /// 823 /// These functions only replace all existing uses. It's possible that as 824 /// these replacements are being performed, CSE may cause the From node 825 /// to be given new uses. These new uses of From are left in place, and 826 /// not automatically transfered to To. 827 /// 828 void ReplaceAllUsesWith(SDValue From, SDValue Op, 829 DAGUpdateListener *UpdateListener = 0); 830 void ReplaceAllUsesWith(SDNode *From, SDNode *To, 831 DAGUpdateListener *UpdateListener = 0); 832 void ReplaceAllUsesWith(SDNode *From, const SDValue *To, 833 DAGUpdateListener *UpdateListener = 0); 834 835 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving 836 /// uses of other values produced by From.Val alone. 837 void ReplaceAllUsesOfValueWith(SDValue From, SDValue To, 838 DAGUpdateListener *UpdateListener = 0); 839 840 /// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but 841 /// for multiple values at once. This correctly handles the case where 842 /// there is an overlap between the From values and the To values. 843 void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To, 844 unsigned Num, 845 DAGUpdateListener *UpdateListener = 0); 846 847 /// AssignTopologicalOrder - Topological-sort the AllNodes list and a 848 /// assign a unique node id for each node in the DAG based on their 849 /// topological order. Returns the number of nodes. 850 unsigned AssignTopologicalOrder(); 851 852 /// RepositionNode - Move node N in the AllNodes list to be immediately 853 /// before the given iterator Position. This may be used to update the 854 /// topological ordering when the list of nodes is modified. 855 void RepositionNode(allnodes_iterator Position, SDNode *N) { 856 AllNodes.insert(Position, AllNodes.remove(N)); 857 } 858 859 /// isCommutativeBinOp - Returns true if the opcode is a commutative binary 860 /// operation. 861 static bool isCommutativeBinOp(unsigned Opcode) { 862 // FIXME: This should get its info from the td file, so that we can include 863 // target info. 864 switch (Opcode) { 865 case ISD::ADD: 866 case ISD::MUL: 867 case ISD::MULHU: 868 case ISD::MULHS: 869 case ISD::SMUL_LOHI: 870 case ISD::UMUL_LOHI: 871 case ISD::FADD: 872 case ISD::FMUL: 873 case ISD::AND: 874 case ISD::OR: 875 case ISD::XOR: 876 case ISD::ADDC: 877 case ISD::ADDE: return true; 878 default: return false; 879 } 880 } 881 882 void dump() const; 883 884 /// CreateStackTemporary - Create a stack temporary, suitable for holding the 885 /// specified value type. If minAlign is specified, the slot size will have 886 /// at least that alignment. 887 SDValue CreateStackTemporary(MVT VT, unsigned minAlign = 1); 888 889 /// CreateStackTemporary - Create a stack temporary suitable for holding 890 /// either of the specified value types. 891 SDValue CreateStackTemporary(MVT VT1, MVT VT2); 892 893 /// FoldConstantArithmetic - 894 SDValue FoldConstantArithmetic(unsigned Opcode, 895 MVT VT, 896 ConstantSDNode *Cst1, 897 ConstantSDNode *Cst2); 898 899 /// FoldSetCC - Constant fold a setcc to true or false. 900 SDValue FoldSetCC(MVT VT, SDValue N1, 901 SDValue N2, ISD::CondCode Cond, DebugLoc dl); 902 903 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We 904 /// use this predicate to simplify operations downstream. 905 bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const; 906 907 /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We 908 /// use this predicate to simplify operations downstream. Op and Mask are 909 /// known to be the same type. 910 bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0) 911 const; 912 913 /// ComputeMaskedBits - Determine which of the bits specified in Mask are 914 /// known to be either zero or one and return them in the KnownZero/KnownOne 915 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit 916 /// processing. Targets can implement the computeMaskedBitsForTargetNode 917 /// method in the TargetLowering class to allow target nodes to be understood. 918 void ComputeMaskedBits(SDValue Op, const APInt &Mask, APInt &KnownZero, 919 APInt &KnownOne, unsigned Depth = 0) const; 920 921 /// ComputeNumSignBits - Return the number of times the sign bit of the 922 /// register is replicated into the other bits. We know that at least 1 bit 923 /// is always equal to the sign bit (itself), but other cases can give us 924 /// information. For example, immediately after an "SRA X, 2", we know that 925 /// the top 3 bits are all equal to each other, so we return 3. Targets can 926 /// implement the ComputeNumSignBitsForTarget method in the TargetLowering 927 /// class to allow target nodes to be understood. 928 unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const; 929 930 /// isVerifiedDebugInfoDesc - Returns true if the specified SDValue has 931 /// been verified as a debug information descriptor. 932 bool isVerifiedDebugInfoDesc(SDValue Op) const; 933 934 /// getShuffleScalarElt - Returns the scalar element that will make up the ith 935 /// element of the result of the vector shuffle. 936 SDValue getShuffleScalarElt(const SDNode *N, unsigned Idx); 937 938private: 939 bool RemoveNodeFromCSEMaps(SDNode *N); 940 void AddModifiedNodeToCSEMaps(SDNode *N, DAGUpdateListener *UpdateListener); 941 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos); 942 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2, 943 void *&InsertPos); 944 SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps, 945 void *&InsertPos); 946 947 void DeleteNodeNotInCSEMaps(SDNode *N); 948 void DeallocateNode(SDNode *N); 949 950 unsigned getMVTAlignment(MVT MemoryVT) const; 951 952 void allnodes_clear(); 953 954 /// VTList - List of non-single value types. 955 std::vector<SDVTList> VTList; 956 957 /// CondCodeNodes - Maps to auto-CSE operations. 958 std::vector<CondCodeSDNode*> CondCodeNodes; 959 960 std::vector<SDNode*> ValueTypeNodes; 961 std::map<MVT, SDNode*, MVT::compareRawBits> ExtendedValueTypeNodes; 962 StringMap<SDNode*> ExternalSymbols; 963 StringMap<SDNode*> TargetExternalSymbols; 964}; 965 966template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> { 967 typedef SelectionDAG::allnodes_iterator nodes_iterator; 968 static nodes_iterator nodes_begin(SelectionDAG *G) { 969 return G->allnodes_begin(); 970 } 971 static nodes_iterator nodes_end(SelectionDAG *G) { 972 return G->allnodes_end(); 973 } 974}; 975 976} // end namespace llvm 977 978#endif 979