SelectionDAG.h revision 8ad9b43e690e8773cf836b30e8da26bc71e18844
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, SDValue Root, unsigned LabelID); 323 SDValue getLabel(unsigned Opcode, DebugLoc dl, SDValue Root, 324 unsigned LabelID); 325 326 SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N) { 327 return getNode(ISD::CopyToReg, MVT::Other, Chain, 328 getRegister(Reg, N.getValueType()), N); 329 } 330 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N) { 331 return getNode(ISD::CopyToReg, dl, MVT::Other, Chain, 332 getRegister(Reg, N.getValueType()), N); 333 } 334 335 // This version of the getCopyToReg method takes an extra operand, which 336 // indicates that there is potentially an incoming flag value (if Flag is not 337 // null) and that there should be a flag result. 338 SDValue getCopyToReg(SDValue Chain, unsigned Reg, SDValue N, 339 SDValue Flag) { 340 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 341 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag }; 342 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 343 } 344 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N, 345 SDValue Flag) { 346 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 347 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag }; 348 return getNode(ISD::CopyToReg, dl, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 349 } 350 351 // Similar to last getCopyToReg() except parameter Reg is a SDValue 352 SDValue getCopyToReg(SDValue Chain, SDValue Reg, SDValue N, 353 SDValue Flag) { 354 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 355 SDValue Ops[] = { Chain, Reg, N, Flag }; 356 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 357 } 358 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, SDValue Reg, SDValue N, 359 SDValue Flag) { 360 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 361 SDValue Ops[] = { Chain, Reg, N, Flag }; 362 return getNode(ISD::CopyToReg, dl, VTs, 2, Ops, Flag.getNode() ? 4 : 3); 363 } 364 365 SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT) { 366 const MVT *VTs = getNodeValueTypes(VT, MVT::Other); 367 SDValue Ops[] = { Chain, getRegister(Reg, VT) }; 368 return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2); 369 } 370 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, MVT VT) { 371 const MVT *VTs = getNodeValueTypes(VT, MVT::Other); 372 SDValue Ops[] = { Chain, getRegister(Reg, VT) }; 373 return getNode(ISD::CopyFromReg, dl, VTs, 2, Ops, 2); 374 } 375 376 // This version of the getCopyFromReg method takes an extra operand, which 377 // indicates that there is potentially an incoming flag value (if Flag is not 378 // null) and that there should be a flag result. 379 SDValue getCopyFromReg(SDValue Chain, unsigned Reg, MVT VT, 380 SDValue Flag) { 381 const MVT *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag); 382 SDValue Ops[] = { Chain, getRegister(Reg, VT), Flag }; 383 return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.getNode() ? 3 : 2); 384 } 385 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, MVT VT, 386 SDValue Flag) { 387 const MVT *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag); 388 SDValue Ops[] = { Chain, getRegister(Reg, VT), Flag }; 389 return getNode(ISD::CopyFromReg, dl, VTs, 3, Ops, Flag.getNode() ? 3 : 2); 390 } 391 392 SDValue getCondCode(ISD::CondCode Cond); 393 394 /// Returns the ConvertRndSat Note: Avoid using this node because it may 395 /// disappear in the future and most targets don't support it. 396// SDValue getConvertRndSat(MVT VT, SDValue Val, SDValue DTy, SDValue STy, 397// SDValue Rnd, SDValue Sat, ISD::CvtCode Code); 398 SDValue getConvertRndSat(MVT VT, DebugLoc dl, SDValue Val, SDValue DTy, 399 SDValue STy, 400 SDValue Rnd, SDValue Sat, ISD::CvtCode Code); 401 402 /// getZeroExtendInReg - Return the expression required to zero extend the Op 403 /// value assuming it was the smaller SrcTy value. 404 SDValue getZeroExtendInReg(SDValue Op, MVT SrcTy); 405 SDValue getZeroExtendInReg(SDValue Op, DebugLoc DL, MVT SrcTy); 406 407 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1). 408 SDValue getNOT(DebugLoc DL, SDValue Val, MVT VT); 409 410 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have 411 /// a flag result (to ensure it's not CSE'd). 412 SDValue getCALLSEQ_START(SDValue Chain, SDValue Op) { 413 const MVT *VTs = getNodeValueTypes(MVT::Other, MVT::Flag); 414 SDValue Ops[] = { Chain, Op }; 415 return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2); 416 } 417 418 /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a 419 /// flag result (to ensure it's not CSE'd). 420 SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2, 421 SDValue InFlag) { 422 SDVTList NodeTys = getVTList(MVT::Other, MVT::Flag); 423 SmallVector<SDValue, 4> Ops; 424 Ops.push_back(Chain); 425 Ops.push_back(Op1); 426 Ops.push_back(Op2); 427 Ops.push_back(InFlag); 428 return getNode(ISD::CALLSEQ_END, NodeTys, &Ops[0], 429 (unsigned)Ops.size() - (InFlag.getNode() == 0 ? 1 : 0)); 430 } 431 432 /// getNode - Gets or creates the specified node. 433 /// 434 SDValue getNode(unsigned Opcode, MVT VT); 435 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT); 436 SDValue getNode(unsigned Opcode, MVT VT, SDValue N); 437 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N); 438 SDValue getNode(unsigned Opcode, MVT VT, SDValue N1, SDValue N2); 439 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, SDValue N1, SDValue N2); 440 SDValue getNode(unsigned Opcode, MVT VT, 441 SDValue N1, SDValue N2, SDValue N3); 442 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 443 SDValue N1, SDValue N2, SDValue N3); 444 SDValue getNode(unsigned Opcode, MVT VT, 445 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 446 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 447 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 448 SDValue getNode(unsigned Opcode, MVT VT, 449 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 450 SDValue N5); 451 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 452 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 453 SDValue N5); 454 SDValue getNode(unsigned Opcode, MVT VT, 455 const SDUse *Ops, unsigned NumOps); 456 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 457 const SDUse *Ops, unsigned NumOps); 458 SDValue getNode(unsigned Opcode, MVT VT, 459 const SDValue *Ops, unsigned NumOps); 460 SDValue getNode(unsigned Opcode, DebugLoc DL, MVT VT, 461 const SDValue *Ops, unsigned NumOps); 462 SDValue getNode(unsigned Opcode, const std::vector<MVT> &ResultTys, 463 const SDValue *Ops, unsigned NumOps); 464 SDValue getNode(unsigned Opcode, DebugLoc DL, 465 const std::vector<MVT> &ResultTys, 466 const SDValue *Ops, unsigned NumOps); 467 SDValue getNode(unsigned Opcode, const MVT *VTs, unsigned NumVTs, 468 const SDValue *Ops, unsigned NumOps); 469 SDValue getNode(unsigned Opcode, DebugLoc DL, const MVT *VTs, unsigned NumVTs, 470 const SDValue *Ops, unsigned NumOps); 471 SDValue getNode(unsigned Opcode, SDVTList VTs, 472 const SDValue *Ops, unsigned NumOps); 473 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 474 const SDValue *Ops, unsigned NumOps); 475 476 SDValue getNode(unsigned Opcode, SDVTList VTs); 477 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs); 478 SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N); 479 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, SDValue N); 480 SDValue getNode(unsigned Opcode, SDVTList VTs, SDValue N1, SDValue N2); 481 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 482 SDValue N1, SDValue N2); 483 SDValue getNode(unsigned Opcode, SDVTList VTs, 484 SDValue N1, SDValue N2, SDValue N3); 485 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 486 SDValue N1, SDValue N2, SDValue N3); 487 SDValue getNode(unsigned Opcode, SDVTList VTs, 488 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 489 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 490 SDValue N1, SDValue N2, SDValue N3, SDValue N4); 491 SDValue getNode(unsigned Opcode, SDVTList VTs, 492 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 493 SDValue N5); 494 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 495 SDValue N1, SDValue N2, SDValue N3, SDValue N4, 496 SDValue N5); 497 498 SDValue getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 499 SDValue Size, unsigned Align, bool AlwaysInline, 500 const Value *DstSV, uint64_t DstSVOff, 501 const Value *SrcSV, uint64_t SrcSVOff); 502 503 SDValue getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 504 SDValue Size, unsigned Align, 505 const Value *DstSV, uint64_t DstOSVff, 506 const Value *SrcSV, uint64_t SrcSVOff); 507 508 SDValue getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src, 509 SDValue Size, unsigned Align, 510 const Value *DstSV, uint64_t DstSVOff); 511 512 /// getSetCC - Helper function to make it easier to build SetCC's if you just 513 /// have an ISD::CondCode instead of an SDValue. 514 /// 515 SDValue getSetCC(MVT VT, SDValue LHS, SDValue RHS, 516 ISD::CondCode Cond) { 517 return getNode(ISD::SETCC, DebugLoc::getUnknownLoc(), VT, 518 LHS, RHS, getCondCode(Cond)); 519 } 520 SDValue getSetCC(DebugLoc DL, MVT VT, SDValue LHS, SDValue RHS, 521 ISD::CondCode Cond) { 522 return getNode(ISD::SETCC, DL, VT, LHS, RHS, getCondCode(Cond)); 523 } 524 525 /// getVSetCC - Helper function to make it easier to build VSetCC's nodes 526 /// if you just have an ISD::CondCode instead of an SDValue. 527 /// 528 SDValue getVSetCC(MVT VT, SDValue LHS, SDValue RHS, 529 ISD::CondCode Cond) { 530 return getNode(ISD::VSETCC, DebugLoc::getUnknownLoc(), VT, 531 LHS, RHS, getCondCode(Cond)); 532 } 533 SDValue getVSetCC(DebugLoc DL, MVT VT, SDValue LHS, SDValue RHS, 534 ISD::CondCode Cond) { 535 return getNode(ISD::VSETCC, DL, VT, LHS, RHS, getCondCode(Cond)); 536 } 537 538 /// getSelectCC - Helper function to make it easier to build SelectCC's if you 539 /// just have an ISD::CondCode instead of an SDValue. 540 /// 541 SDValue getSelectCC(SDValue LHS, SDValue RHS, 542 SDValue True, SDValue False, ISD::CondCode Cond) { 543 return getNode(ISD::SELECT_CC, DebugLoc::getUnknownLoc(), True.getValueType(), 544 LHS, RHS, True, False, getCondCode(Cond)); 545 } 546 SDValue getSelectCC(DebugLoc DL, SDValue LHS, SDValue RHS, 547 SDValue True, SDValue False, ISD::CondCode Cond) { 548 return getNode(ISD::SELECT_CC, DL, True.getValueType(), 549 LHS, RHS, True, False, getCondCode(Cond)); 550 } 551 552 /// getVAArg - VAArg produces a result and token chain, and takes a pointer 553 /// and a source value as input. 554 SDValue getVAArg(MVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr, 555 SDValue SV); 556 557 /// getAtomic - Gets a node for an atomic op, produces result and chain and 558 /// takes 3 operands 559 SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain, 560 SDValue Ptr, SDValue Cmp, SDValue Swp, const Value* PtrVal, 561 unsigned Alignment=0); 562 563 /// getAtomic - Gets a node for an atomic op, produces result and chain and 564 /// takes 2 operands. 565 SDValue getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, SDValue Chain, 566 SDValue Ptr, SDValue Val, const Value* PtrVal, 567 unsigned Alignment = 0); 568 569 /// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a 570 /// result and takes a list of operands. 571 SDValue getMemIntrinsicNode(unsigned Opcode, 572 const MVT *VTs, unsigned NumVTs, 573 const SDValue *Ops, unsigned NumOps, 574 MVT MemVT, const Value *srcValue, int SVOff, 575 unsigned Align = 0, bool Vol = false, 576 bool ReadMem = true, bool WriteMem = true); 577 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, 578 const MVT *VTs, unsigned NumVTs, 579 const SDValue *Ops, unsigned NumOps, 580 MVT MemVT, const Value *srcValue, int SVOff, 581 unsigned Align = 0, bool Vol = false, 582 bool ReadMem = true, bool WriteMem = true); 583 584 SDValue getMemIntrinsicNode(unsigned Opcode, SDVTList VTList, 585 const SDValue *Ops, unsigned NumOps, 586 MVT MemVT, const Value *srcValue, int SVOff, 587 unsigned Align = 0, bool Vol = false, 588 bool ReadMem = true, bool WriteMem = true); 589 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList, 590 const SDValue *Ops, unsigned NumOps, 591 MVT MemVT, const Value *srcValue, int SVOff, 592 unsigned Align = 0, bool Vol = false, 593 bool ReadMem = true, bool WriteMem = true); 594 595 /// getMergeValues - Create a MERGE_VALUES node from the given operands. 596 SDValue getMergeValues(const SDValue *Ops, unsigned NumOps); 597 SDValue getMergeValues(const SDValue *Ops, unsigned NumOps, DebugLoc dl); 598 599 /// getCall - Create a CALL node from the given information. 600 /// 601 SDValue getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs, 602 bool IsTailCall, bool isInreg, SDVTList VTs, 603 const SDValue *Operands, unsigned NumOperands); 604 605 /// getLoad - Loads are not normal binary operators: their result type is not 606 /// determined by their operands, and they produce a value AND a token chain. 607 /// 608 SDValue getLoad(MVT VT, SDValue Chain, SDValue Ptr, 609 const Value *SV, int SVOffset, bool isVolatile=false, 610 unsigned Alignment=0); 611 SDValue getLoad(MVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr, 612 const Value *SV, int SVOffset, bool isVolatile=false, 613 unsigned Alignment=0); 614 SDValue getExtLoad(ISD::LoadExtType ExtType, MVT VT, 615 SDValue Chain, SDValue Ptr, const Value *SV, 616 int SVOffset, MVT EVT, bool isVolatile=false, 617 unsigned Alignment=0); 618 SDValue getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, MVT VT, 619 SDValue Chain, SDValue Ptr, const Value *SV, 620 int SVOffset, MVT EVT, bool isVolatile=false, 621 unsigned Alignment=0); 622 SDValue getIndexedLoad(SDValue OrigLoad, SDValue Base, 623 SDValue Offset, ISD::MemIndexedMode AM); 624 SDValue getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base, 625 SDValue Offset, ISD::MemIndexedMode AM); 626 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, 627 MVT VT, SDValue Chain, 628 SDValue Ptr, SDValue Offset, 629 const Value *SV, int SVOffset, MVT EVT, 630 bool isVolatile=false, unsigned Alignment=0); 631 SDValue getLoad(ISD::MemIndexedMode AM, DebugLoc dl, ISD::LoadExtType ExtType, 632 MVT VT, SDValue Chain, 633 SDValue Ptr, SDValue Offset, 634 const Value *SV, int SVOffset, MVT EVT, 635 bool isVolatile=false, unsigned Alignment=0); 636 637 /// getStore - Helper function to build ISD::STORE nodes. 638 /// 639 SDValue getStore(SDValue Chain, SDValue Val, SDValue Ptr, 640 const Value *SV, int SVOffset, bool isVolatile=false, 641 unsigned Alignment=0); 642 SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr, 643 const Value *SV, int SVOffset, bool isVolatile=false, 644 unsigned Alignment=0); 645 SDValue getTruncStore(SDValue Chain, SDValue Val, SDValue Ptr, 646 const Value *SV, int SVOffset, MVT TVT, 647 bool isVolatile=false, unsigned Alignment=0); 648 SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr, 649 const Value *SV, int SVOffset, MVT TVT, 650 bool isVolatile=false, unsigned Alignment=0); 651 SDValue getIndexedStore(SDValue OrigStoe, SDValue Base, 652 SDValue Offset, ISD::MemIndexedMode AM); 653 SDValue getIndexedStore(SDValue OrigStoe, DebugLoc dl, SDValue Base, 654 SDValue Offset, ISD::MemIndexedMode AM); 655 656 /// getSrcValue - Construct a node to track a Value* through the backend. 657 SDValue getSrcValue(const Value *v); 658 659 /// getMemOperand - Construct a node to track a memory reference 660 /// through the backend. 661 SDValue getMemOperand(const MachineMemOperand &MO); 662 663 /// getShiftAmountOperand - Return the specified value casted to 664 /// the target's desired shift amount type. 665 SDValue getShiftAmountOperand(SDValue Op); 666 667 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the 668 /// specified operands. If the resultant node already exists in the DAG, 669 /// this does not modify the specified node, instead it returns the node that 670 /// already exists. If the resultant node does not exist in the DAG, the 671 /// input node is returned. As a degenerate case, if you specify the same 672 /// input operands as the node already has, the input node is returned. 673 SDValue UpdateNodeOperands(SDValue N, SDValue Op); 674 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2); 675 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 676 SDValue Op3); 677 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 678 SDValue Op3, SDValue Op4); 679 SDValue UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 680 SDValue Op3, SDValue Op4, SDValue Op5); 681 SDValue UpdateNodeOperands(SDValue N, 682 const SDValue *Ops, unsigned NumOps); 683 684 /// SelectNodeTo - These are used for target selectors to *mutate* the 685 /// specified node to have the specified return type, Target opcode, and 686 /// operands. Note that target opcodes are stored as 687 /// ~TargetOpcode in the node opcode field. The resultant node is returned. 688 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT); 689 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, SDValue Op1); 690 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 691 SDValue Op1, SDValue Op2); 692 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 693 SDValue Op1, SDValue Op2, SDValue Op3); 694 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT, 695 const SDValue *Ops, unsigned NumOps); 696 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, MVT VT2); 697 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 698 MVT VT2, const SDValue *Ops, unsigned NumOps); 699 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 700 MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps); 701 SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, MVT VT1, 702 MVT VT2, MVT VT3, MVT VT4, const SDValue *Ops, 703 unsigned NumOps); 704 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 705 MVT VT2, SDValue Op1); 706 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 707 MVT VT2, SDValue Op1, SDValue Op2); 708 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 709 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 710 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT VT1, 711 MVT VT2, MVT VT3, SDValue Op1, SDValue Op2, SDValue Op3); 712 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs, 713 const SDValue *Ops, unsigned NumOps); 714 715 /// MorphNodeTo - These *mutate* the specified node to have the specified 716 /// return type, opcode, and operands. 717 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT); 718 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, SDValue Op1); 719 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 720 SDValue Op1, SDValue Op2); 721 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 722 SDValue Op1, SDValue Op2, SDValue Op3); 723 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT, 724 const SDValue *Ops, unsigned NumOps); 725 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, MVT VT2); 726 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 727 MVT VT2, const SDValue *Ops, unsigned NumOps); 728 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 729 MVT VT2, MVT VT3, const SDValue *Ops, unsigned NumOps); 730 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 731 MVT VT2, SDValue Op1); 732 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 733 MVT VT2, SDValue Op1, SDValue Op2); 734 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, MVT VT1, 735 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 736 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs, 737 const SDValue *Ops, unsigned NumOps); 738 739 /// getTargetNode - These are used for target selectors to create a new node 740 /// with specified return type(s), target opcode, and operands. 741 /// 742 /// Note that getTargetNode returns the resultant node. If there is already a 743 /// node of the specified opcode and operands, it returns that node instead of 744 /// the current one. 745 SDNode *getTargetNode(unsigned Opcode, MVT VT); 746 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT); 747 748 SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1); 749 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, SDValue Op1); 750 751 SDNode *getTargetNode(unsigned Opcode, MVT VT, SDValue Op1, SDValue Op2); 752 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, SDValue Op1, 753 SDValue Op2); 754 755 SDNode *getTargetNode(unsigned Opcode, MVT VT, 756 SDValue Op1, SDValue Op2, SDValue Op3); 757 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 758 SDValue Op1, SDValue Op2, SDValue Op3); 759 760 SDNode *getTargetNode(unsigned Opcode, MVT VT, 761 const SDValue *Ops, unsigned NumOps); 762 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 763 const SDValue *Ops, unsigned NumOps); 764 765 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2); 766 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2); 767 768 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, SDValue Op1); 769 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, 770 SDValue Op1); 771 772 SDNode *getTargetNode(unsigned Opcode, MVT VT1, 773 MVT VT2, SDValue Op1, SDValue Op2); 774 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 775 MVT VT2, SDValue Op1, SDValue Op2); 776 777 SDNode *getTargetNode(unsigned Opcode, MVT VT1, 778 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 779 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 780 MVT VT2, SDValue Op1, SDValue Op2, SDValue Op3); 781 782 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, 783 const SDValue *Ops, unsigned NumOps); 784 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, 785 const SDValue *Ops, unsigned NumOps); 786 787 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 788 SDValue Op1, SDValue Op2); 789 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 790 SDValue Op1, SDValue Op2); 791 792 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 793 SDValue Op1, SDValue Op2, SDValue Op3); 794 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 795 SDValue Op1, SDValue Op2, SDValue Op3); 796 797 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 798 const SDValue *Ops, unsigned NumOps); 799 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 800 const SDValue *Ops, unsigned NumOps); 801 802 SDNode *getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, MVT VT4, 803 const SDValue *Ops, unsigned NumOps); 804 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, MVT VT2, MVT VT3, 805 MVT VT4, const SDValue *Ops, unsigned NumOps); 806 807 SDNode *getTargetNode(unsigned Opcode, const std::vector<MVT> &ResultTys, 808 const SDValue *Ops, unsigned NumOps); 809 SDNode *getTargetNode(unsigned Opcode, DebugLoc dl, 810 const std::vector<MVT> &ResultTys, const SDValue *Ops, 811 unsigned NumOps); 812 813 /// getNodeIfExists - Get the specified node if it's already available, or 814 /// else return NULL. 815 SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs, 816 const SDValue *Ops, unsigned NumOps); 817 818 /// DAGUpdateListener - Clients of various APIs that cause global effects on 819 /// the DAG can optionally implement this interface. This allows the clients 820 /// to handle the various sorts of updates that happen. 821 class DAGUpdateListener { 822 public: 823 virtual ~DAGUpdateListener(); 824 825 /// NodeDeleted - The node N that was deleted and, if E is not null, an 826 /// equivalent node E that replaced it. 827 virtual void NodeDeleted(SDNode *N, SDNode *E) = 0; 828 829 /// NodeUpdated - The node N that was updated. 830 virtual void NodeUpdated(SDNode *N) = 0; 831 }; 832 833 /// RemoveDeadNode - Remove the specified node from the system. If any of its 834 /// operands then becomes dead, remove them as well. Inform UpdateListener 835 /// for each node deleted. 836 void RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener = 0); 837 838 /// RemoveDeadNodes - This method deletes the unreachable nodes in the 839 /// given list, and any nodes that become unreachable as a result. 840 void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes, 841 DAGUpdateListener *UpdateListener = 0); 842 843 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 844 /// This can cause recursive merging of nodes in the DAG. Use the first 845 /// version if 'From' is known to have a single result, use the second 846 /// if you have two nodes with identical results, use the third otherwise. 847 /// 848 /// These methods all take an optional UpdateListener, which (if not null) is 849 /// informed about nodes that are deleted and modified due to recursive 850 /// changes in the dag. 851 /// 852 /// These functions only replace all existing uses. It's possible that as 853 /// these replacements are being performed, CSE may cause the From node 854 /// to be given new uses. These new uses of From are left in place, and 855 /// not automatically transfered to To. 856 /// 857 void ReplaceAllUsesWith(SDValue From, SDValue Op, 858 DAGUpdateListener *UpdateListener = 0); 859 void ReplaceAllUsesWith(SDNode *From, SDNode *To, 860 DAGUpdateListener *UpdateListener = 0); 861 void ReplaceAllUsesWith(SDNode *From, const SDValue *To, 862 DAGUpdateListener *UpdateListener = 0); 863 864 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving 865 /// uses of other values produced by From.Val alone. 866 void ReplaceAllUsesOfValueWith(SDValue From, SDValue To, 867 DAGUpdateListener *UpdateListener = 0); 868 869 /// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but 870 /// for multiple values at once. This correctly handles the case where 871 /// there is an overlap between the From values and the To values. 872 void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To, 873 unsigned Num, 874 DAGUpdateListener *UpdateListener = 0); 875 876 /// AssignTopologicalOrder - Topological-sort the AllNodes list and a 877 /// assign a unique node id for each node in the DAG based on their 878 /// topological order. Returns the number of nodes. 879 unsigned AssignTopologicalOrder(); 880 881 /// RepositionNode - Move node N in the AllNodes list to be immediately 882 /// before the given iterator Position. This may be used to update the 883 /// topological ordering when the list of nodes is modified. 884 void RepositionNode(allnodes_iterator Position, SDNode *N) { 885 AllNodes.insert(Position, AllNodes.remove(N)); 886 } 887 888 /// isCommutativeBinOp - Returns true if the opcode is a commutative binary 889 /// operation. 890 static bool isCommutativeBinOp(unsigned Opcode) { 891 // FIXME: This should get its info from the td file, so that we can include 892 // target info. 893 switch (Opcode) { 894 case ISD::ADD: 895 case ISD::MUL: 896 case ISD::MULHU: 897 case ISD::MULHS: 898 case ISD::SMUL_LOHI: 899 case ISD::UMUL_LOHI: 900 case ISD::FADD: 901 case ISD::FMUL: 902 case ISD::AND: 903 case ISD::OR: 904 case ISD::XOR: 905 case ISD::ADDC: 906 case ISD::ADDE: return true; 907 default: return false; 908 } 909 } 910 911 void dump() const; 912 913 /// CreateStackTemporary - Create a stack temporary, suitable for holding the 914 /// specified value type. If minAlign is specified, the slot size will have 915 /// at least that alignment. 916 SDValue CreateStackTemporary(MVT VT, unsigned minAlign = 1); 917 918 /// CreateStackTemporary - Create a stack temporary suitable for holding 919 /// either of the specified value types. 920 SDValue CreateStackTemporary(MVT VT1, MVT VT2); 921 922 /// FoldConstantArithmetic - 923 SDValue FoldConstantArithmetic(unsigned Opcode, 924 MVT VT, 925 ConstantSDNode *Cst1, 926 ConstantSDNode *Cst2); 927 928 /// FoldSetCC - Constant fold a setcc to true or false. 929 SDValue FoldSetCC(MVT VT, SDValue N1, 930 SDValue N2, ISD::CondCode Cond, DebugLoc dl); 931 932 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We 933 /// use this predicate to simplify operations downstream. 934 bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const; 935 936 /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We 937 /// use this predicate to simplify operations downstream. Op and Mask are 938 /// known to be the same type. 939 bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0) 940 const; 941 942 /// ComputeMaskedBits - Determine which of the bits specified in Mask are 943 /// known to be either zero or one and return them in the KnownZero/KnownOne 944 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit 945 /// processing. Targets can implement the computeMaskedBitsForTargetNode 946 /// method in the TargetLowering class to allow target nodes to be understood. 947 void ComputeMaskedBits(SDValue Op, const APInt &Mask, APInt &KnownZero, 948 APInt &KnownOne, unsigned Depth = 0) const; 949 950 /// ComputeNumSignBits - Return the number of times the sign bit of the 951 /// register is replicated into the other bits. We know that at least 1 bit 952 /// is always equal to the sign bit (itself), but other cases can give us 953 /// information. For example, immediately after an "SRA X, 2", we know that 954 /// the top 3 bits are all equal to each other, so we return 3. Targets can 955 /// implement the ComputeNumSignBitsForTarget method in the TargetLowering 956 /// class to allow target nodes to be understood. 957 unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const; 958 959 /// isVerifiedDebugInfoDesc - Returns true if the specified SDValue has 960 /// been verified as a debug information descriptor. 961 bool isVerifiedDebugInfoDesc(SDValue Op) const; 962 963 /// getShuffleScalarElt - Returns the scalar element that will make up the ith 964 /// element of the result of the vector shuffle. 965 SDValue getShuffleScalarElt(const SDNode *N, unsigned Idx); 966 967private: 968 bool RemoveNodeFromCSEMaps(SDNode *N); 969 void AddModifiedNodeToCSEMaps(SDNode *N, DAGUpdateListener *UpdateListener); 970 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos); 971 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2, 972 void *&InsertPos); 973 SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps, 974 void *&InsertPos); 975 976 void DeleteNodeNotInCSEMaps(SDNode *N); 977 void DeallocateNode(SDNode *N); 978 979 unsigned getMVTAlignment(MVT MemoryVT) const; 980 981 void allnodes_clear(); 982 983 /// VTList - List of non-single value types. 984 std::vector<SDVTList> VTList; 985 986 /// CondCodeNodes - Maps to auto-CSE operations. 987 std::vector<CondCodeSDNode*> CondCodeNodes; 988 989 std::vector<SDNode*> ValueTypeNodes; 990 std::map<MVT, SDNode*, MVT::compareRawBits> ExtendedValueTypeNodes; 991 StringMap<SDNode*> ExternalSymbols; 992 StringMap<SDNode*> TargetExternalSymbols; 993}; 994 995template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> { 996 typedef SelectionDAG::allnodes_iterator nodes_iterator; 997 static nodes_iterator nodes_begin(SelectionDAG *G) { 998 return G->allnodes_begin(); 999 } 1000 static nodes_iterator nodes_end(SelectionDAG *G) { 1001 return G->allnodes_end(); 1002 } 1003}; 1004 1005} // end namespace llvm 1006 1007#endif 1008