SelectionDAG.cpp revision f5d9789a7fddc9173cee104c8f25a7564bad3f28
1//===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===// 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 implements the SelectionDAG class. 11// 12//===----------------------------------------------------------------------===// 13#include "llvm/CodeGen/SelectionDAG.h" 14#include "llvm/Constants.h" 15#include "llvm/Analysis/ValueTracking.h" 16#include "llvm/GlobalAlias.h" 17#include "llvm/GlobalVariable.h" 18#include "llvm/Intrinsics.h" 19#include "llvm/DerivedTypes.h" 20#include "llvm/Assembly/Writer.h" 21#include "llvm/CallingConv.h" 22#include "llvm/CodeGen/MachineBasicBlock.h" 23#include "llvm/CodeGen/MachineConstantPool.h" 24#include "llvm/CodeGen/MachineFrameInfo.h" 25#include "llvm/CodeGen/MachineModuleInfo.h" 26#include "llvm/CodeGen/PseudoSourceValue.h" 27#include "llvm/Target/TargetRegisterInfo.h" 28#include "llvm/Target/TargetData.h" 29#include "llvm/Target/TargetLowering.h" 30#include "llvm/Target/TargetOptions.h" 31#include "llvm/Target/TargetInstrInfo.h" 32#include "llvm/Target/TargetMachine.h" 33#include "llvm/Support/CommandLine.h" 34#include "llvm/Support/MathExtras.h" 35#include "llvm/Support/raw_ostream.h" 36#include "llvm/ADT/SetVector.h" 37#include "llvm/ADT/SmallPtrSet.h" 38#include "llvm/ADT/SmallSet.h" 39#include "llvm/ADT/SmallVector.h" 40#include "llvm/ADT/StringExtras.h" 41#include <algorithm> 42#include <cmath> 43using namespace llvm; 44 45/// makeVTList - Return an instance of the SDVTList struct initialized with the 46/// specified members. 47static SDVTList makeVTList(const MVT *VTs, unsigned NumVTs) { 48 SDVTList Res = {VTs, NumVTs}; 49 return Res; 50} 51 52static const fltSemantics *MVTToAPFloatSemantics(MVT VT) { 53 switch (VT.getSimpleVT()) { 54 default: assert(0 && "Unknown FP format"); 55 case MVT::f32: return &APFloat::IEEEsingle; 56 case MVT::f64: return &APFloat::IEEEdouble; 57 case MVT::f80: return &APFloat::x87DoubleExtended; 58 case MVT::f128: return &APFloat::IEEEquad; 59 case MVT::ppcf128: return &APFloat::PPCDoubleDouble; 60 } 61} 62 63SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {} 64 65//===----------------------------------------------------------------------===// 66// ConstantFPSDNode Class 67//===----------------------------------------------------------------------===// 68 69/// isExactlyValue - We don't rely on operator== working on double values, as 70/// it returns true for things that are clearly not equal, like -0.0 and 0.0. 71/// As such, this method can be used to do an exact bit-for-bit comparison of 72/// two floating point values. 73bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const { 74 return getValueAPF().bitwiseIsEqual(V); 75} 76 77bool ConstantFPSDNode::isValueValidForType(MVT VT, 78 const APFloat& Val) { 79 assert(VT.isFloatingPoint() && "Can only convert between FP types"); 80 81 // PPC long double cannot be converted to any other type. 82 if (VT == MVT::ppcf128 || 83 &Val.getSemantics() == &APFloat::PPCDoubleDouble) 84 return false; 85 86 // convert modifies in place, so make a copy. 87 APFloat Val2 = APFloat(Val); 88 bool losesInfo; 89 (void) Val2.convert(*MVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven, 90 &losesInfo); 91 return !losesInfo; 92} 93 94//===----------------------------------------------------------------------===// 95// ISD Namespace 96//===----------------------------------------------------------------------===// 97 98/// isBuildVectorAllOnes - Return true if the specified node is a 99/// BUILD_VECTOR where all of the elements are ~0 or undef. 100bool ISD::isBuildVectorAllOnes(const SDNode *N) { 101 // Look through a bit convert. 102 if (N->getOpcode() == ISD::BIT_CONVERT) 103 N = N->getOperand(0).getNode(); 104 105 if (N->getOpcode() != ISD::BUILD_VECTOR) return false; 106 107 unsigned i = 0, e = N->getNumOperands(); 108 109 // Skip over all of the undef values. 110 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF) 111 ++i; 112 113 // Do not accept an all-undef vector. 114 if (i == e) return false; 115 116 // Do not accept build_vectors that aren't all constants or which have non-~0 117 // elements. 118 SDValue NotZero = N->getOperand(i); 119 if (isa<ConstantSDNode>(NotZero)) { 120 if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue()) 121 return false; 122 } else if (isa<ConstantFPSDNode>(NotZero)) { 123 if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF(). 124 bitcastToAPInt().isAllOnesValue()) 125 return false; 126 } else 127 return false; 128 129 // Okay, we have at least one ~0 value, check to see if the rest match or are 130 // undefs. 131 for (++i; i != e; ++i) 132 if (N->getOperand(i) != NotZero && 133 N->getOperand(i).getOpcode() != ISD::UNDEF) 134 return false; 135 return true; 136} 137 138 139/// isBuildVectorAllZeros - Return true if the specified node is a 140/// BUILD_VECTOR where all of the elements are 0 or undef. 141bool ISD::isBuildVectorAllZeros(const SDNode *N) { 142 // Look through a bit convert. 143 if (N->getOpcode() == ISD::BIT_CONVERT) 144 N = N->getOperand(0).getNode(); 145 146 if (N->getOpcode() != ISD::BUILD_VECTOR) return false; 147 148 unsigned i = 0, e = N->getNumOperands(); 149 150 // Skip over all of the undef values. 151 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF) 152 ++i; 153 154 // Do not accept an all-undef vector. 155 if (i == e) return false; 156 157 // Do not accept build_vectors that aren't all constants or which have non-~0 158 // elements. 159 SDValue Zero = N->getOperand(i); 160 if (isa<ConstantSDNode>(Zero)) { 161 if (!cast<ConstantSDNode>(Zero)->isNullValue()) 162 return false; 163 } else if (isa<ConstantFPSDNode>(Zero)) { 164 if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero()) 165 return false; 166 } else 167 return false; 168 169 // Okay, we have at least one ~0 value, check to see if the rest match or are 170 // undefs. 171 for (++i; i != e; ++i) 172 if (N->getOperand(i) != Zero && 173 N->getOperand(i).getOpcode() != ISD::UNDEF) 174 return false; 175 return true; 176} 177 178/// isScalarToVector - Return true if the specified node is a 179/// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low 180/// element is not an undef. 181bool ISD::isScalarToVector(const SDNode *N) { 182 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR) 183 return true; 184 185 if (N->getOpcode() != ISD::BUILD_VECTOR) 186 return false; 187 if (N->getOperand(0).getOpcode() == ISD::UNDEF) 188 return false; 189 unsigned NumElems = N->getNumOperands(); 190 for (unsigned i = 1; i < NumElems; ++i) { 191 SDValue V = N->getOperand(i); 192 if (V.getOpcode() != ISD::UNDEF) 193 return false; 194 } 195 return true; 196} 197 198 199/// isDebugLabel - Return true if the specified node represents a debug 200/// label (i.e. ISD::DBG_LABEL or TargetInstrInfo::DBG_LABEL node). 201bool ISD::isDebugLabel(const SDNode *N) { 202 SDValue Zero; 203 if (N->getOpcode() == ISD::DBG_LABEL) 204 return true; 205 if (N->isMachineOpcode() && 206 N->getMachineOpcode() == TargetInstrInfo::DBG_LABEL) 207 return true; 208 return false; 209} 210 211/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 212/// when given the operation for (X op Y). 213ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) { 214 // To perform this operation, we just need to swap the L and G bits of the 215 // operation. 216 unsigned OldL = (Operation >> 2) & 1; 217 unsigned OldG = (Operation >> 1) & 1; 218 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits 219 (OldL << 1) | // New G bit 220 (OldG << 2)); // New L bit. 221} 222 223/// getSetCCInverse - Return the operation corresponding to !(X op Y), where 224/// 'op' is a valid SetCC operation. 225ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) { 226 unsigned Operation = Op; 227 if (isInteger) 228 Operation ^= 7; // Flip L, G, E bits, but not U. 229 else 230 Operation ^= 15; // Flip all of the condition bits. 231 232 if (Operation > ISD::SETTRUE2) 233 Operation &= ~8; // Don't let N and U bits get set. 234 235 return ISD::CondCode(Operation); 236} 237 238 239/// isSignedOp - For an integer comparison, return 1 if the comparison is a 240/// signed operation and 2 if the result is an unsigned comparison. Return zero 241/// if the operation does not depend on the sign of the input (setne and seteq). 242static int isSignedOp(ISD::CondCode Opcode) { 243 switch (Opcode) { 244 default: assert(0 && "Illegal integer setcc operation!"); 245 case ISD::SETEQ: 246 case ISD::SETNE: return 0; 247 case ISD::SETLT: 248 case ISD::SETLE: 249 case ISD::SETGT: 250 case ISD::SETGE: return 1; 251 case ISD::SETULT: 252 case ISD::SETULE: 253 case ISD::SETUGT: 254 case ISD::SETUGE: return 2; 255 } 256} 257 258/// getSetCCOrOperation - Return the result of a logical OR between different 259/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function 260/// returns SETCC_INVALID if it is not possible to represent the resultant 261/// comparison. 262ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2, 263 bool isInteger) { 264 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 265 // Cannot fold a signed integer setcc with an unsigned integer setcc. 266 return ISD::SETCC_INVALID; 267 268 unsigned Op = Op1 | Op2; // Combine all of the condition bits. 269 270 // If the N and U bits get set then the resultant comparison DOES suddenly 271 // care about orderedness, and is true when ordered. 272 if (Op > ISD::SETTRUE2) 273 Op &= ~16; // Clear the U bit if the N bit is set. 274 275 // Canonicalize illegal integer setcc's. 276 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT 277 Op = ISD::SETNE; 278 279 return ISD::CondCode(Op); 280} 281 282/// getSetCCAndOperation - Return the result of a logical AND between different 283/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 284/// function returns zero if it is not possible to represent the resultant 285/// comparison. 286ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2, 287 bool isInteger) { 288 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 289 // Cannot fold a signed setcc with an unsigned setcc. 290 return ISD::SETCC_INVALID; 291 292 // Combine all of the condition bits. 293 ISD::CondCode Result = ISD::CondCode(Op1 & Op2); 294 295 // Canonicalize illegal integer setcc's. 296 if (isInteger) { 297 switch (Result) { 298 default: break; 299 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT 300 case ISD::SETOEQ: // SETEQ & SETU[LG]E 301 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE 302 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE 303 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE 304 } 305 } 306 307 return Result; 308} 309 310const TargetMachine &SelectionDAG::getTarget() const { 311 return MF->getTarget(); 312} 313 314//===----------------------------------------------------------------------===// 315// SDNode Profile Support 316//===----------------------------------------------------------------------===// 317 318/// AddNodeIDOpcode - Add the node opcode to the NodeID data. 319/// 320static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) { 321 ID.AddInteger(OpC); 322} 323 324/// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them 325/// solely with their pointer. 326static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) { 327 ID.AddPointer(VTList.VTs); 328} 329 330/// AddNodeIDOperands - Various routines for adding operands to the NodeID data. 331/// 332static void AddNodeIDOperands(FoldingSetNodeID &ID, 333 const SDValue *Ops, unsigned NumOps) { 334 for (; NumOps; --NumOps, ++Ops) { 335 ID.AddPointer(Ops->getNode()); 336 ID.AddInteger(Ops->getResNo()); 337 } 338} 339 340/// AddNodeIDOperands - Various routines for adding operands to the NodeID data. 341/// 342static void AddNodeIDOperands(FoldingSetNodeID &ID, 343 const SDUse *Ops, unsigned NumOps) { 344 for (; NumOps; --NumOps, ++Ops) { 345 ID.AddPointer(Ops->getNode()); 346 ID.AddInteger(Ops->getResNo()); 347 } 348} 349 350static void AddNodeIDNode(FoldingSetNodeID &ID, 351 unsigned short OpC, SDVTList VTList, 352 const SDValue *OpList, unsigned N) { 353 AddNodeIDOpcode(ID, OpC); 354 AddNodeIDValueTypes(ID, VTList); 355 AddNodeIDOperands(ID, OpList, N); 356} 357 358/// AddNodeIDCustom - If this is an SDNode with special info, add this info to 359/// the NodeID data. 360static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) { 361 switch (N->getOpcode()) { 362 default: break; // Normal nodes don't need extra info. 363 case ISD::ARG_FLAGS: 364 ID.AddInteger(cast<ARG_FLAGSSDNode>(N)->getArgFlags().getRawBits()); 365 break; 366 case ISD::TargetConstant: 367 case ISD::Constant: 368 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue()); 369 break; 370 case ISD::TargetConstantFP: 371 case ISD::ConstantFP: { 372 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue()); 373 break; 374 } 375 case ISD::TargetGlobalAddress: 376 case ISD::GlobalAddress: 377 case ISD::TargetGlobalTLSAddress: 378 case ISD::GlobalTLSAddress: { 379 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N); 380 ID.AddPointer(GA->getGlobal()); 381 ID.AddInteger(GA->getOffset()); 382 break; 383 } 384 case ISD::BasicBlock: 385 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock()); 386 break; 387 case ISD::Register: 388 ID.AddInteger(cast<RegisterSDNode>(N)->getReg()); 389 break; 390 case ISD::DBG_STOPPOINT: { 391 const DbgStopPointSDNode *DSP = cast<DbgStopPointSDNode>(N); 392 ID.AddInteger(DSP->getLine()); 393 ID.AddInteger(DSP->getColumn()); 394 ID.AddPointer(DSP->getCompileUnit()); 395 break; 396 } 397 case ISD::SRCVALUE: 398 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue()); 399 break; 400 case ISD::MEMOPERAND: { 401 const MachineMemOperand &MO = cast<MemOperandSDNode>(N)->MO; 402 MO.Profile(ID); 403 break; 404 } 405 case ISD::FrameIndex: 406 case ISD::TargetFrameIndex: 407 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex()); 408 break; 409 case ISD::JumpTable: 410 case ISD::TargetJumpTable: 411 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex()); 412 break; 413 case ISD::ConstantPool: 414 case ISD::TargetConstantPool: { 415 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N); 416 ID.AddInteger(CP->getAlignment()); 417 ID.AddInteger(CP->getOffset()); 418 if (CP->isMachineConstantPoolEntry()) 419 CP->getMachineCPVal()->AddSelectionDAGCSEId(ID); 420 else 421 ID.AddPointer(CP->getConstVal()); 422 break; 423 } 424 case ISD::CALL: { 425 const CallSDNode *Call = cast<CallSDNode>(N); 426 ID.AddInteger(Call->getCallingConv()); 427 ID.AddInteger(Call->isVarArg()); 428 break; 429 } 430 case ISD::LOAD: { 431 const LoadSDNode *LD = cast<LoadSDNode>(N); 432 ID.AddInteger(LD->getMemoryVT().getRawBits()); 433 ID.AddInteger(LD->getRawSubclassData()); 434 break; 435 } 436 case ISD::STORE: { 437 const StoreSDNode *ST = cast<StoreSDNode>(N); 438 ID.AddInteger(ST->getMemoryVT().getRawBits()); 439 ID.AddInteger(ST->getRawSubclassData()); 440 break; 441 } 442 case ISD::ATOMIC_CMP_SWAP: 443 case ISD::ATOMIC_SWAP: 444 case ISD::ATOMIC_LOAD_ADD: 445 case ISD::ATOMIC_LOAD_SUB: 446 case ISD::ATOMIC_LOAD_AND: 447 case ISD::ATOMIC_LOAD_OR: 448 case ISD::ATOMIC_LOAD_XOR: 449 case ISD::ATOMIC_LOAD_NAND: 450 case ISD::ATOMIC_LOAD_MIN: 451 case ISD::ATOMIC_LOAD_MAX: 452 case ISD::ATOMIC_LOAD_UMIN: 453 case ISD::ATOMIC_LOAD_UMAX: { 454 const AtomicSDNode *AT = cast<AtomicSDNode>(N); 455 ID.AddInteger(AT->getMemoryVT().getRawBits()); 456 ID.AddInteger(AT->getRawSubclassData()); 457 break; 458 } 459 } // end switch (N->getOpcode()) 460} 461 462/// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID 463/// data. 464static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) { 465 AddNodeIDOpcode(ID, N->getOpcode()); 466 // Add the return value info. 467 AddNodeIDValueTypes(ID, N->getVTList()); 468 // Add the operand info. 469 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands()); 470 471 // Handle SDNode leafs with special info. 472 AddNodeIDCustom(ID, N); 473} 474 475/// encodeMemSDNodeFlags - Generic routine for computing a value for use in 476/// the CSE map that carries alignment, volatility, indexing mode, and 477/// extension/truncation information. 478/// 479static inline unsigned 480encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, 481 bool isVolatile, unsigned Alignment) { 482 assert((ConvType & 3) == ConvType && 483 "ConvType may not require more than 2 bits!"); 484 assert((AM & 7) == AM && 485 "AM may not require more than 3 bits!"); 486 return ConvType | 487 (AM << 2) | 488 (isVolatile << 5) | 489 ((Log2_32(Alignment) + 1) << 6); 490} 491 492//===----------------------------------------------------------------------===// 493// SelectionDAG Class 494//===----------------------------------------------------------------------===// 495 496/// doNotCSE - Return true if CSE should not be performed for this node. 497static bool doNotCSE(SDNode *N) { 498 if (N->getValueType(0) == MVT::Flag) 499 return true; // Never CSE anything that produces a flag. 500 501 switch (N->getOpcode()) { 502 default: break; 503 case ISD::HANDLENODE: 504 case ISD::DBG_LABEL: 505 case ISD::DBG_STOPPOINT: 506 case ISD::EH_LABEL: 507 case ISD::DECLARE: 508 return true; // Never CSE these nodes. 509 } 510 511 // Check that remaining values produced are not flags. 512 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i) 513 if (N->getValueType(i) == MVT::Flag) 514 return true; // Never CSE anything that produces a flag. 515 516 return false; 517} 518 519/// RemoveDeadNodes - This method deletes all unreachable nodes in the 520/// SelectionDAG. 521void SelectionDAG::RemoveDeadNodes() { 522 // Create a dummy node (which is not added to allnodes), that adds a reference 523 // to the root node, preventing it from being deleted. 524 HandleSDNode Dummy(getRoot()); 525 526 SmallVector<SDNode*, 128> DeadNodes; 527 528 // Add all obviously-dead nodes to the DeadNodes worklist. 529 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I) 530 if (I->use_empty()) 531 DeadNodes.push_back(I); 532 533 RemoveDeadNodes(DeadNodes); 534 535 // If the root changed (e.g. it was a dead load, update the root). 536 setRoot(Dummy.getValue()); 537} 538 539/// RemoveDeadNodes - This method deletes the unreachable nodes in the 540/// given list, and any nodes that become unreachable as a result. 541void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes, 542 DAGUpdateListener *UpdateListener) { 543 544 // Process the worklist, deleting the nodes and adding their uses to the 545 // worklist. 546 while (!DeadNodes.empty()) { 547 SDNode *N = DeadNodes.pop_back_val(); 548 549 if (UpdateListener) 550 UpdateListener->NodeDeleted(N, 0); 551 552 // Take the node out of the appropriate CSE map. 553 RemoveNodeFromCSEMaps(N); 554 555 // Next, brutally remove the operand list. This is safe to do, as there are 556 // no cycles in the graph. 557 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) { 558 SDUse &Use = *I++; 559 SDNode *Operand = Use.getNode(); 560 Use.set(SDValue()); 561 562 // Now that we removed this operand, see if there are no uses of it left. 563 if (Operand->use_empty()) 564 DeadNodes.push_back(Operand); 565 } 566 567 DeallocateNode(N); 568 } 569} 570 571void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){ 572 SmallVector<SDNode*, 16> DeadNodes(1, N); 573 RemoveDeadNodes(DeadNodes, UpdateListener); 574} 575 576void SelectionDAG::DeleteNode(SDNode *N) { 577 // First take this out of the appropriate CSE map. 578 RemoveNodeFromCSEMaps(N); 579 580 // Finally, remove uses due to operands of this node, remove from the 581 // AllNodes list, and delete the node. 582 DeleteNodeNotInCSEMaps(N); 583} 584 585void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) { 586 assert(N != AllNodes.begin() && "Cannot delete the entry node!"); 587 assert(N->use_empty() && "Cannot delete a node that is not dead!"); 588 589 // Drop all of the operands and decrement used node's use counts. 590 N->DropOperands(); 591 592 DeallocateNode(N); 593} 594 595void SelectionDAG::DeallocateNode(SDNode *N) { 596 if (N->OperandsNeedDelete) 597 delete[] N->OperandList; 598 599 // Set the opcode to DELETED_NODE to help catch bugs when node 600 // memory is reallocated. 601 N->NodeType = ISD::DELETED_NODE; 602 603 NodeAllocator.Deallocate(AllNodes.remove(N)); 604} 605 606/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that 607/// correspond to it. This is useful when we're about to delete or repurpose 608/// the node. We don't want future request for structurally identical nodes 609/// to return N anymore. 610bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) { 611 bool Erased = false; 612 switch (N->getOpcode()) { 613 case ISD::EntryToken: 614 assert(0 && "EntryToken should not be in CSEMaps!"); 615 return false; 616 case ISD::HANDLENODE: return false; // noop. 617 case ISD::CONDCODE: 618 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] && 619 "Cond code doesn't exist!"); 620 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0; 621 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0; 622 break; 623 case ISD::ExternalSymbol: 624 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 625 break; 626 case ISD::TargetExternalSymbol: 627 Erased = 628 TargetExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 629 break; 630 case ISD::VALUETYPE: { 631 MVT VT = cast<VTSDNode>(N)->getVT(); 632 if (VT.isExtended()) { 633 Erased = ExtendedValueTypeNodes.erase(VT); 634 } else { 635 Erased = ValueTypeNodes[VT.getSimpleVT()] != 0; 636 ValueTypeNodes[VT.getSimpleVT()] = 0; 637 } 638 break; 639 } 640 default: 641 // Remove it from the CSE Map. 642 Erased = CSEMap.RemoveNode(N); 643 break; 644 } 645#ifndef NDEBUG 646 // Verify that the node was actually in one of the CSE maps, unless it has a 647 // flag result (which cannot be CSE'd) or is one of the special cases that are 648 // not subject to CSE. 649 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag && 650 !N->isMachineOpcode() && !doNotCSE(N)) { 651 N->dump(this); 652 cerr << "\n"; 653 assert(0 && "Node is not in map!"); 654 } 655#endif 656 return Erased; 657} 658 659/// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE 660/// maps and modified in place. Add it back to the CSE maps, unless an identical 661/// node already exists, in which case transfer all its users to the existing 662/// node. This transfer can potentially trigger recursive merging. 663/// 664void 665SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N, 666 DAGUpdateListener *UpdateListener) { 667 // For node types that aren't CSE'd, just act as if no identical node 668 // already exists. 669 if (!doNotCSE(N)) { 670 SDNode *Existing = CSEMap.GetOrInsertNode(N); 671 if (Existing != N) { 672 // If there was already an existing matching node, use ReplaceAllUsesWith 673 // to replace the dead one with the existing one. This can cause 674 // recursive merging of other unrelated nodes down the line. 675 ReplaceAllUsesWith(N, Existing, UpdateListener); 676 677 // N is now dead. Inform the listener if it exists and delete it. 678 if (UpdateListener) 679 UpdateListener->NodeDeleted(N, Existing); 680 DeleteNodeNotInCSEMaps(N); 681 return; 682 } 683 } 684 685 // If the node doesn't already exist, we updated it. Inform a listener if 686 // it exists. 687 if (UpdateListener) 688 UpdateListener->NodeUpdated(N); 689} 690 691/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 692/// were replaced with those specified. If this node is never memoized, 693/// return null, otherwise return a pointer to the slot it would take. If a 694/// node already exists with these operands, the slot will be non-null. 695SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op, 696 void *&InsertPos) { 697 if (doNotCSE(N)) 698 return 0; 699 700 SDValue Ops[] = { Op }; 701 FoldingSetNodeID ID; 702 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1); 703 AddNodeIDCustom(ID, N); 704 return CSEMap.FindNodeOrInsertPos(ID, InsertPos); 705} 706 707/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 708/// were replaced with those specified. If this node is never memoized, 709/// return null, otherwise return a pointer to the slot it would take. If a 710/// node already exists with these operands, the slot will be non-null. 711SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, 712 SDValue Op1, SDValue Op2, 713 void *&InsertPos) { 714 if (doNotCSE(N)) 715 return 0; 716 717 SDValue Ops[] = { Op1, Op2 }; 718 FoldingSetNodeID ID; 719 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2); 720 AddNodeIDCustom(ID, N); 721 return CSEMap.FindNodeOrInsertPos(ID, InsertPos); 722} 723 724 725/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 726/// were replaced with those specified. If this node is never memoized, 727/// return null, otherwise return a pointer to the slot it would take. If a 728/// node already exists with these operands, the slot will be non-null. 729SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, 730 const SDValue *Ops,unsigned NumOps, 731 void *&InsertPos) { 732 if (doNotCSE(N)) 733 return 0; 734 735 FoldingSetNodeID ID; 736 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps); 737 AddNodeIDCustom(ID, N); 738 return CSEMap.FindNodeOrInsertPos(ID, InsertPos); 739} 740 741/// VerifyNode - Sanity check the given node. Aborts if it is invalid. 742void SelectionDAG::VerifyNode(SDNode *N) { 743 switch (N->getOpcode()) { 744 default: 745 break; 746 case ISD::BUILD_PAIR: { 747 MVT VT = N->getValueType(0); 748 assert(N->getNumValues() == 1 && "Too many results!"); 749 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) && 750 "Wrong return type!"); 751 assert(N->getNumOperands() == 2 && "Wrong number of operands!"); 752 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() && 753 "Mismatched operand types!"); 754 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() && 755 "Wrong operand type!"); 756 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() && 757 "Wrong return type size"); 758 break; 759 } 760 case ISD::BUILD_VECTOR: { 761 assert(N->getNumValues() == 1 && "Too many results!"); 762 assert(N->getValueType(0).isVector() && "Wrong return type!"); 763 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() && 764 "Wrong number of operands!"); 765 // FIXME: Change vector_shuffle to a variadic node with mask elements being 766 // operands of the node. Currently the mask is a BUILD_VECTOR passed as an 767 // operand, and it is not always possible to legalize it. Turning off the 768 // following checks at least makes it possible to legalize most of the time. 769// MVT EltVT = N->getValueType(0).getVectorElementType(); 770// for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) 771// assert(I->getValueType() == EltVT && 772// "Wrong operand type!"); 773 break; 774 } 775 } 776} 777 778/// getMVTAlignment - Compute the default alignment value for the 779/// given type. 780/// 781unsigned SelectionDAG::getMVTAlignment(MVT VT) const { 782 const Type *Ty = VT == MVT::iPTR ? 783 PointerType::get(Type::Int8Ty, 0) : 784 VT.getTypeForMVT(); 785 786 return TLI.getTargetData()->getABITypeAlignment(Ty); 787} 788 789SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli) 790 : TLI(tli), FLI(fli), DW(0), 791 EntryNode(ISD::EntryToken, getVTList(MVT::Other)), 792 Root(getEntryNode()) { 793 AllNodes.push_back(&EntryNode); 794} 795 796void SelectionDAG::init(MachineFunction &mf, MachineModuleInfo *mmi, 797 DwarfWriter *dw) { 798 MF = &mf; 799 MMI = mmi; 800 DW = dw; 801} 802 803SelectionDAG::~SelectionDAG() { 804 allnodes_clear(); 805} 806 807void SelectionDAG::allnodes_clear() { 808 assert(&*AllNodes.begin() == &EntryNode); 809 AllNodes.remove(AllNodes.begin()); 810 while (!AllNodes.empty()) 811 DeallocateNode(AllNodes.begin()); 812} 813 814void SelectionDAG::clear() { 815 allnodes_clear(); 816 OperandAllocator.Reset(); 817 CSEMap.clear(); 818 819 ExtendedValueTypeNodes.clear(); 820 ExternalSymbols.clear(); 821 TargetExternalSymbols.clear(); 822 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(), 823 static_cast<CondCodeSDNode*>(0)); 824 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(), 825 static_cast<SDNode*>(0)); 826 827 EntryNode.UseList = 0; 828 AllNodes.push_back(&EntryNode); 829 Root = getEntryNode(); 830} 831 832SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, MVT VT) { 833 if (Op.getValueType() == VT) return Op; 834 APInt Imm = APInt::getLowBitsSet(Op.getValueSizeInBits(), 835 VT.getSizeInBits()); 836 return getNode(ISD::AND, Op.getValueType(), Op, 837 getConstant(Imm, Op.getValueType())); 838} 839 840SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, MVT VT) { 841 if (Op.getValueType() == VT) return Op; 842 APInt Imm = APInt::getLowBitsSet(Op.getValueSizeInBits(), 843 VT.getSizeInBits()); 844 return getNode(ISD::AND, DL, Op.getValueType(), Op, 845 getConstant(Imm, Op.getValueType())); 846} 847 848/// getNOT - Create a bitwise NOT operation as (XOR Val, -1). 849/// 850SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, MVT VT) { 851 SDValue NegOne; 852 if (VT.isVector()) { 853 MVT EltVT = VT.getVectorElementType(); 854 SDValue NegOneElt = 855 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), EltVT); 856 std::vector<SDValue> NegOnes(VT.getVectorNumElements(), NegOneElt); 857 NegOne = getNode(ISD::BUILD_VECTOR, DL, VT, &NegOnes[0], NegOnes.size()); 858 } else { 859 NegOne = getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT); 860 } 861 return getNode(ISD::XOR, DL, VT, Val, NegOne); 862} 863 864SDValue SelectionDAG::getConstant(uint64_t Val, MVT VT, bool isT) { 865 MVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT; 866 assert((EltVT.getSizeInBits() >= 64 || 867 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) && 868 "getConstant with a uint64_t value that doesn't fit in the type!"); 869 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT); 870} 871 872SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) { 873 return getConstant(*ConstantInt::get(Val), VT, isT); 874} 875 876SDValue SelectionDAG::getConstant(const ConstantInt &Val, MVT VT, bool isT) { 877 assert(VT.isInteger() && "Cannot create FP integer constant!"); 878 879 MVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT; 880 assert(Val.getBitWidth() == EltVT.getSizeInBits() && 881 "APInt size does not match type size!"); 882 883 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant; 884 FoldingSetNodeID ID; 885 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0); 886 ID.AddPointer(&Val); 887 void *IP = 0; 888 SDNode *N = NULL; 889 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP))) 890 if (!VT.isVector()) 891 return SDValue(N, 0); 892 if (!N) { 893 N = NodeAllocator.Allocate<ConstantSDNode>(); 894 new (N) ConstantSDNode(isT, &Val, EltVT); 895 CSEMap.InsertNode(N, IP); 896 AllNodes.push_back(N); 897 } 898 899 SDValue Result(N, 0); 900 if (VT.isVector()) { 901 SmallVector<SDValue, 8> Ops; 902 Ops.assign(VT.getVectorNumElements(), Result); 903 Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size()); 904 } 905 return Result; 906} 907 908SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) { 909 return getConstant(Val, TLI.getPointerTy(), isTarget); 910} 911 912 913SDValue SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) { 914 return getConstantFP(*ConstantFP::get(V), VT, isTarget); 915} 916 917SDValue SelectionDAG::getConstantFP(const ConstantFP& V, MVT VT, bool isTarget){ 918 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!"); 919 920 MVT EltVT = 921 VT.isVector() ? VT.getVectorElementType() : VT; 922 923 // Do the map lookup using the actual bit pattern for the floating point 924 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and 925 // we don't have issues with SNANs. 926 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP; 927 FoldingSetNodeID ID; 928 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0); 929 ID.AddPointer(&V); 930 void *IP = 0; 931 SDNode *N = NULL; 932 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP))) 933 if (!VT.isVector()) 934 return SDValue(N, 0); 935 if (!N) { 936 N = NodeAllocator.Allocate<ConstantFPSDNode>(); 937 new (N) ConstantFPSDNode(isTarget, &V, EltVT); 938 CSEMap.InsertNode(N, IP); 939 AllNodes.push_back(N); 940 } 941 942 SDValue Result(N, 0); 943 if (VT.isVector()) { 944 SmallVector<SDValue, 8> Ops; 945 Ops.assign(VT.getVectorNumElements(), Result); 946 Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size()); 947 } 948 return Result; 949} 950 951SDValue SelectionDAG::getConstantFP(double Val, MVT VT, bool isTarget) { 952 MVT EltVT = 953 VT.isVector() ? VT.getVectorElementType() : VT; 954 if (EltVT==MVT::f32) 955 return getConstantFP(APFloat((float)Val), VT, isTarget); 956 else 957 return getConstantFP(APFloat(Val), VT, isTarget); 958} 959 960SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV, 961 MVT VT, int64_t Offset, 962 bool isTargetGA) { 963 unsigned Opc; 964 965 // Truncate (with sign-extension) the offset value to the pointer size. 966 unsigned BitWidth = TLI.getPointerTy().getSizeInBits(); 967 if (BitWidth < 64) 968 Offset = (Offset << (64 - BitWidth) >> (64 - BitWidth)); 969 970 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); 971 if (!GVar) { 972 // If GV is an alias then use the aliasee for determining thread-localness. 973 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) 974 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false)); 975 } 976 977 if (GVar && GVar->isThreadLocal()) 978 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress; 979 else 980 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress; 981 982 FoldingSetNodeID ID; 983 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 984 ID.AddPointer(GV); 985 ID.AddInteger(Offset); 986 void *IP = 0; 987 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 988 return SDValue(E, 0); 989 SDNode *N = NodeAllocator.Allocate<GlobalAddressSDNode>(); 990 new (N) GlobalAddressSDNode(isTargetGA, GV, VT, Offset); 991 CSEMap.InsertNode(N, IP); 992 AllNodes.push_back(N); 993 return SDValue(N, 0); 994} 995 996SDValue SelectionDAG::getFrameIndex(int FI, MVT VT, bool isTarget) { 997 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex; 998 FoldingSetNodeID ID; 999 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1000 ID.AddInteger(FI); 1001 void *IP = 0; 1002 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1003 return SDValue(E, 0); 1004 SDNode *N = NodeAllocator.Allocate<FrameIndexSDNode>(); 1005 new (N) FrameIndexSDNode(FI, VT, isTarget); 1006 CSEMap.InsertNode(N, IP); 1007 AllNodes.push_back(N); 1008 return SDValue(N, 0); 1009} 1010 1011SDValue SelectionDAG::getJumpTable(int JTI, MVT VT, bool isTarget){ 1012 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable; 1013 FoldingSetNodeID ID; 1014 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1015 ID.AddInteger(JTI); 1016 void *IP = 0; 1017 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1018 return SDValue(E, 0); 1019 SDNode *N = NodeAllocator.Allocate<JumpTableSDNode>(); 1020 new (N) JumpTableSDNode(JTI, VT, isTarget); 1021 CSEMap.InsertNode(N, IP); 1022 AllNodes.push_back(N); 1023 return SDValue(N, 0); 1024} 1025 1026SDValue SelectionDAG::getConstantPool(Constant *C, MVT VT, 1027 unsigned Alignment, int Offset, 1028 bool isTarget) { 1029 if (Alignment == 0) 1030 Alignment = 1031 TLI.getTargetData()->getPreferredTypeAlignmentShift(C->getType()); 1032 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool; 1033 FoldingSetNodeID ID; 1034 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1035 ID.AddInteger(Alignment); 1036 ID.AddInteger(Offset); 1037 ID.AddPointer(C); 1038 void *IP = 0; 1039 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1040 return SDValue(E, 0); 1041 SDNode *N = NodeAllocator.Allocate<ConstantPoolSDNode>(); 1042 new (N) ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment); 1043 CSEMap.InsertNode(N, IP); 1044 AllNodes.push_back(N); 1045 return SDValue(N, 0); 1046} 1047 1048 1049SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, MVT VT, 1050 unsigned Alignment, int Offset, 1051 bool isTarget) { 1052 if (Alignment == 0) 1053 Alignment = 1054 TLI.getTargetData()->getPreferredTypeAlignmentShift(C->getType()); 1055 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool; 1056 FoldingSetNodeID ID; 1057 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1058 ID.AddInteger(Alignment); 1059 ID.AddInteger(Offset); 1060 C->AddSelectionDAGCSEId(ID); 1061 void *IP = 0; 1062 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1063 return SDValue(E, 0); 1064 SDNode *N = NodeAllocator.Allocate<ConstantPoolSDNode>(); 1065 new (N) ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment); 1066 CSEMap.InsertNode(N, IP); 1067 AllNodes.push_back(N); 1068 return SDValue(N, 0); 1069} 1070 1071SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 1072 FoldingSetNodeID ID; 1073 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0); 1074 ID.AddPointer(MBB); 1075 void *IP = 0; 1076 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1077 return SDValue(E, 0); 1078 SDNode *N = NodeAllocator.Allocate<BasicBlockSDNode>(); 1079 new (N) BasicBlockSDNode(MBB); 1080 CSEMap.InsertNode(N, IP); 1081 AllNodes.push_back(N); 1082 return SDValue(N, 0); 1083} 1084 1085SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB, DebugLoc dl) { 1086 FoldingSetNodeID ID; 1087 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0); 1088 ID.AddPointer(MBB); 1089 void *IP = 0; 1090 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1091 return SDValue(E, 0); 1092 SDNode *N = NodeAllocator.Allocate<BasicBlockSDNode>(); 1093 new (N) BasicBlockSDNode(MBB, dl); 1094 CSEMap.InsertNode(N, IP); 1095 AllNodes.push_back(N); 1096 return SDValue(N, 0); 1097} 1098 1099SDValue SelectionDAG::getArgFlags(ISD::ArgFlagsTy Flags) { 1100 FoldingSetNodeID ID; 1101 AddNodeIDNode(ID, ISD::ARG_FLAGS, getVTList(MVT::Other), 0, 0); 1102 ID.AddInteger(Flags.getRawBits()); 1103 void *IP = 0; 1104 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1105 return SDValue(E, 0); 1106 SDNode *N = NodeAllocator.Allocate<ARG_FLAGSSDNode>(); 1107 new (N) ARG_FLAGSSDNode(Flags); 1108 CSEMap.InsertNode(N, IP); 1109 AllNodes.push_back(N); 1110 return SDValue(N, 0); 1111} 1112 1113SDValue SelectionDAG::getValueType(MVT VT) { 1114 if (VT.isSimple() && (unsigned)VT.getSimpleVT() >= ValueTypeNodes.size()) 1115 ValueTypeNodes.resize(VT.getSimpleVT()+1); 1116 1117 SDNode *&N = VT.isExtended() ? 1118 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT()]; 1119 1120 if (N) return SDValue(N, 0); 1121 N = NodeAllocator.Allocate<VTSDNode>(); 1122 new (N) VTSDNode(VT); 1123 AllNodes.push_back(N); 1124 return SDValue(N, 0); 1125} 1126 1127SDValue SelectionDAG::getExternalSymbol(const char *Sym, MVT VT) { 1128 SDNode *&N = ExternalSymbols[Sym]; 1129 if (N) return SDValue(N, 0); 1130 N = NodeAllocator.Allocate<ExternalSymbolSDNode>(); 1131 new (N) ExternalSymbolSDNode(false, Sym, VT); 1132 AllNodes.push_back(N); 1133 return SDValue(N, 0); 1134} 1135 1136SDValue SelectionDAG::getExternalSymbol(const char *Sym, DebugLoc dl, MVT VT) { 1137 SDNode *&N = ExternalSymbols[Sym]; 1138 if (N) return SDValue(N, 0); 1139 N = NodeAllocator.Allocate<ExternalSymbolSDNode>(); 1140 new (N) ExternalSymbolSDNode(false, dl, Sym, VT); 1141 AllNodes.push_back(N); 1142 return SDValue(N, 0); 1143} 1144 1145SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, MVT VT) { 1146 SDNode *&N = TargetExternalSymbols[Sym]; 1147 if (N) return SDValue(N, 0); 1148 N = NodeAllocator.Allocate<ExternalSymbolSDNode>(); 1149 new (N) ExternalSymbolSDNode(true, Sym, VT); 1150 AllNodes.push_back(N); 1151 return SDValue(N, 0); 1152} 1153 1154SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, DebugLoc dl, 1155 MVT VT) { 1156 SDNode *&N = TargetExternalSymbols[Sym]; 1157 if (N) return SDValue(N, 0); 1158 N = NodeAllocator.Allocate<ExternalSymbolSDNode>(); 1159 new (N) ExternalSymbolSDNode(true, dl, Sym, VT); 1160 AllNodes.push_back(N); 1161 return SDValue(N, 0); 1162} 1163 1164SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) { 1165 if ((unsigned)Cond >= CondCodeNodes.size()) 1166 CondCodeNodes.resize(Cond+1); 1167 1168 if (CondCodeNodes[Cond] == 0) { 1169 CondCodeSDNode *N = NodeAllocator.Allocate<CondCodeSDNode>(); 1170 new (N) CondCodeSDNode(Cond); 1171 CondCodeNodes[Cond] = N; 1172 AllNodes.push_back(N); 1173 } 1174 return SDValue(CondCodeNodes[Cond], 0); 1175} 1176 1177SDValue SelectionDAG::getConvertRndSat(MVT VT, DebugLoc dl, 1178 SDValue Val, SDValue DTy, 1179 SDValue STy, SDValue Rnd, SDValue Sat, 1180 ISD::CvtCode Code) { 1181 // If the src and dest types are the same, no conversion is necessary. 1182 if (DTy == STy) 1183 return Val; 1184 1185 FoldingSetNodeID ID; 1186 void* IP = 0; 1187 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1188 return SDValue(E, 0); 1189 CvtRndSatSDNode *N = NodeAllocator.Allocate<CvtRndSatSDNode>(); 1190 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat }; 1191 new (N) CvtRndSatSDNode(VT, dl, Ops, 5, Code); 1192 CSEMap.InsertNode(N, IP); 1193 AllNodes.push_back(N); 1194 return SDValue(N, 0); 1195} 1196 1197SDValue SelectionDAG::getRegister(unsigned RegNo, MVT VT) { 1198 FoldingSetNodeID ID; 1199 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0); 1200 ID.AddInteger(RegNo); 1201 void *IP = 0; 1202 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1203 return SDValue(E, 0); 1204 SDNode *N = NodeAllocator.Allocate<RegisterSDNode>(); 1205 new (N) RegisterSDNode(RegNo, VT); 1206 CSEMap.InsertNode(N, IP); 1207 AllNodes.push_back(N); 1208 return SDValue(N, 0); 1209} 1210 1211SDValue SelectionDAG::getDbgStopPoint(SDValue Root, 1212 unsigned Line, unsigned Col, 1213 Value *CU) { 1214 SDNode *N = NodeAllocator.Allocate<DbgStopPointSDNode>(); 1215 new (N) DbgStopPointSDNode(Root, Line, Col, CU); 1216 AllNodes.push_back(N); 1217 return SDValue(N, 0); 1218} 1219 1220SDValue SelectionDAG::getLabel(unsigned Opcode, DebugLoc dl, 1221 SDValue Root, 1222 unsigned LabelID) { 1223 FoldingSetNodeID ID; 1224 SDValue Ops[] = { Root }; 1225 AddNodeIDNode(ID, Opcode, getVTList(MVT::Other), &Ops[0], 1); 1226 ID.AddInteger(LabelID); 1227 void *IP = 0; 1228 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1229 return SDValue(E, 0); 1230 SDNode *N = NodeAllocator.Allocate<LabelSDNode>(); 1231 new (N) LabelSDNode(Opcode, dl, Root, LabelID); 1232 CSEMap.InsertNode(N, IP); 1233 AllNodes.push_back(N); 1234 return SDValue(N, 0); 1235} 1236 1237SDValue SelectionDAG::getSrcValue(const Value *V) { 1238 assert((!V || isa<PointerType>(V->getType())) && 1239 "SrcValue is not a pointer?"); 1240 1241 FoldingSetNodeID ID; 1242 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0); 1243 ID.AddPointer(V); 1244 1245 void *IP = 0; 1246 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1247 return SDValue(E, 0); 1248 1249 SDNode *N = NodeAllocator.Allocate<SrcValueSDNode>(); 1250 new (N) SrcValueSDNode(V); 1251 CSEMap.InsertNode(N, IP); 1252 AllNodes.push_back(N); 1253 return SDValue(N, 0); 1254} 1255 1256SDValue SelectionDAG::getMemOperand(const MachineMemOperand &MO) { 1257#ifndef NDEBUG 1258 const Value *v = MO.getValue(); 1259 assert((!v || isa<PointerType>(v->getType())) && 1260 "SrcValue is not a pointer?"); 1261#endif 1262 1263 FoldingSetNodeID ID; 1264 AddNodeIDNode(ID, ISD::MEMOPERAND, getVTList(MVT::Other), 0, 0); 1265 MO.Profile(ID); 1266 1267 void *IP = 0; 1268 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1269 return SDValue(E, 0); 1270 1271 SDNode *N = NodeAllocator.Allocate<MemOperandSDNode>(); 1272 new (N) MemOperandSDNode(MO); 1273 CSEMap.InsertNode(N, IP); 1274 AllNodes.push_back(N); 1275 return SDValue(N, 0); 1276} 1277 1278/// getShiftAmountOperand - Return the specified value casted to 1279/// the target's desired shift amount type. 1280SDValue SelectionDAG::getShiftAmountOperand(SDValue Op) { 1281 MVT OpTy = Op.getValueType(); 1282 MVT ShTy = TLI.getShiftAmountTy(); 1283 if (OpTy == ShTy || OpTy.isVector()) return Op; 1284 1285 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND; 1286 return getNode(Opcode, ShTy, Op); 1287} 1288 1289/// CreateStackTemporary - Create a stack temporary, suitable for holding the 1290/// specified value type. 1291SDValue SelectionDAG::CreateStackTemporary(MVT VT, unsigned minAlign) { 1292 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo(); 1293 unsigned ByteSize = VT.getStoreSizeInBits()/8; 1294 const Type *Ty = VT.getTypeForMVT(); 1295 unsigned StackAlign = 1296 std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), minAlign); 1297 1298 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign); 1299 return getFrameIndex(FrameIdx, TLI.getPointerTy()); 1300} 1301 1302/// CreateStackTemporary - Create a stack temporary suitable for holding 1303/// either of the specified value types. 1304SDValue SelectionDAG::CreateStackTemporary(MVT VT1, MVT VT2) { 1305 unsigned Bytes = std::max(VT1.getStoreSizeInBits(), 1306 VT2.getStoreSizeInBits())/8; 1307 const Type *Ty1 = VT1.getTypeForMVT(); 1308 const Type *Ty2 = VT2.getTypeForMVT(); 1309 const TargetData *TD = TLI.getTargetData(); 1310 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1), 1311 TD->getPrefTypeAlignment(Ty2)); 1312 1313 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo(); 1314 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align); 1315 return getFrameIndex(FrameIdx, TLI.getPointerTy()); 1316} 1317 1318SDValue SelectionDAG::FoldSetCC(MVT VT, SDValue N1, 1319 SDValue N2, ISD::CondCode Cond, DebugLoc dl) { 1320 // These setcc operations always fold. 1321 switch (Cond) { 1322 default: break; 1323 case ISD::SETFALSE: 1324 case ISD::SETFALSE2: return getConstant(0, VT); 1325 case ISD::SETTRUE: 1326 case ISD::SETTRUE2: return getConstant(1, VT); 1327 1328 case ISD::SETOEQ: 1329 case ISD::SETOGT: 1330 case ISD::SETOGE: 1331 case ISD::SETOLT: 1332 case ISD::SETOLE: 1333 case ISD::SETONE: 1334 case ISD::SETO: 1335 case ISD::SETUO: 1336 case ISD::SETUEQ: 1337 case ISD::SETUNE: 1338 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!"); 1339 break; 1340 } 1341 1342 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) { 1343 const APInt &C2 = N2C->getAPIntValue(); 1344 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) { 1345 const APInt &C1 = N1C->getAPIntValue(); 1346 1347 switch (Cond) { 1348 default: assert(0 && "Unknown integer setcc!"); 1349 case ISD::SETEQ: return getConstant(C1 == C2, VT); 1350 case ISD::SETNE: return getConstant(C1 != C2, VT); 1351 case ISD::SETULT: return getConstant(C1.ult(C2), VT); 1352 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT); 1353 case ISD::SETULE: return getConstant(C1.ule(C2), VT); 1354 case ISD::SETUGE: return getConstant(C1.uge(C2), VT); 1355 case ISD::SETLT: return getConstant(C1.slt(C2), VT); 1356 case ISD::SETGT: return getConstant(C1.sgt(C2), VT); 1357 case ISD::SETLE: return getConstant(C1.sle(C2), VT); 1358 case ISD::SETGE: return getConstant(C1.sge(C2), VT); 1359 } 1360 } 1361 } 1362 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) { 1363 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) { 1364 // No compile time operations on this type yet. 1365 if (N1C->getValueType(0) == MVT::ppcf128) 1366 return SDValue(); 1367 1368 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF()); 1369 switch (Cond) { 1370 default: break; 1371 case ISD::SETEQ: if (R==APFloat::cmpUnordered) 1372 return getNode(ISD::UNDEF, dl, VT); 1373 // fall through 1374 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT); 1375 case ISD::SETNE: if (R==APFloat::cmpUnordered) 1376 return getNode(ISD::UNDEF, dl, VT); 1377 // fall through 1378 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan || 1379 R==APFloat::cmpLessThan, VT); 1380 case ISD::SETLT: if (R==APFloat::cmpUnordered) 1381 return getNode(ISD::UNDEF, dl, VT); 1382 // fall through 1383 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT); 1384 case ISD::SETGT: if (R==APFloat::cmpUnordered) 1385 return getNode(ISD::UNDEF, dl, VT); 1386 // fall through 1387 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT); 1388 case ISD::SETLE: if (R==APFloat::cmpUnordered) 1389 return getNode(ISD::UNDEF, dl, VT); 1390 // fall through 1391 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan || 1392 R==APFloat::cmpEqual, VT); 1393 case ISD::SETGE: if (R==APFloat::cmpUnordered) 1394 return getNode(ISD::UNDEF, dl, VT); 1395 // fall through 1396 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan || 1397 R==APFloat::cmpEqual, VT); 1398 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT); 1399 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT); 1400 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered || 1401 R==APFloat::cmpEqual, VT); 1402 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT); 1403 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered || 1404 R==APFloat::cmpLessThan, VT); 1405 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan || 1406 R==APFloat::cmpUnordered, VT); 1407 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT); 1408 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT); 1409 } 1410 } else { 1411 // Ensure that the constant occurs on the RHS. 1412 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond)); 1413 } 1414 } 1415 1416 // Could not fold it. 1417 return SDValue(); 1418} 1419 1420/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We 1421/// use this predicate to simplify operations downstream. 1422bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const { 1423 unsigned BitWidth = Op.getValueSizeInBits(); 1424 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth); 1425} 1426 1427/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use 1428/// this predicate to simplify operations downstream. Mask is known to be zero 1429/// for bits that V cannot have. 1430bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask, 1431 unsigned Depth) const { 1432 APInt KnownZero, KnownOne; 1433 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth); 1434 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1435 return (KnownZero & Mask) == Mask; 1436} 1437 1438/// ComputeMaskedBits - Determine which of the bits specified in Mask are 1439/// known to be either zero or one and return them in the KnownZero/KnownOne 1440/// bitsets. This code only analyzes bits in Mask, in order to short-circuit 1441/// processing. 1442void SelectionDAG::ComputeMaskedBits(SDValue Op, const APInt &Mask, 1443 APInt &KnownZero, APInt &KnownOne, 1444 unsigned Depth) const { 1445 unsigned BitWidth = Mask.getBitWidth(); 1446 assert(BitWidth == Op.getValueType().getSizeInBits() && 1447 "Mask size mismatches value type size!"); 1448 1449 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything. 1450 if (Depth == 6 || Mask == 0) 1451 return; // Limit search depth. 1452 1453 APInt KnownZero2, KnownOne2; 1454 1455 switch (Op.getOpcode()) { 1456 case ISD::Constant: 1457 // We know all of the bits for a constant! 1458 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask; 1459 KnownZero = ~KnownOne & Mask; 1460 return; 1461 case ISD::AND: 1462 // If either the LHS or the RHS are Zero, the result is zero. 1463 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 1464 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero, 1465 KnownZero2, KnownOne2, Depth+1); 1466 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1467 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1468 1469 // Output known-1 bits are only known if set in both the LHS & RHS. 1470 KnownOne &= KnownOne2; 1471 // Output known-0 are known to be clear if zero in either the LHS | RHS. 1472 KnownZero |= KnownZero2; 1473 return; 1474 case ISD::OR: 1475 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 1476 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne, 1477 KnownZero2, KnownOne2, Depth+1); 1478 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1479 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1480 1481 // Output known-0 bits are only known if clear in both the LHS & RHS. 1482 KnownZero &= KnownZero2; 1483 // Output known-1 are known to be set if set in either the LHS | RHS. 1484 KnownOne |= KnownOne2; 1485 return; 1486 case ISD::XOR: { 1487 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 1488 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1); 1489 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1490 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1491 1492 // Output known-0 bits are known if clear or set in both the LHS & RHS. 1493 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2); 1494 // Output known-1 are known to be set if set in only one of the LHS, RHS. 1495 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2); 1496 KnownZero = KnownZeroOut; 1497 return; 1498 } 1499 case ISD::MUL: { 1500 APInt Mask2 = APInt::getAllOnesValue(BitWidth); 1501 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1); 1502 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1); 1503 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1504 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1505 1506 // If low bits are zero in either operand, output low known-0 bits. 1507 // Also compute a conserative estimate for high known-0 bits. 1508 // More trickiness is possible, but this is sufficient for the 1509 // interesting case of alignment computation. 1510 KnownOne.clear(); 1511 unsigned TrailZ = KnownZero.countTrailingOnes() + 1512 KnownZero2.countTrailingOnes(); 1513 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() + 1514 KnownZero2.countLeadingOnes(), 1515 BitWidth) - BitWidth; 1516 1517 TrailZ = std::min(TrailZ, BitWidth); 1518 LeadZ = std::min(LeadZ, BitWidth); 1519 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) | 1520 APInt::getHighBitsSet(BitWidth, LeadZ); 1521 KnownZero &= Mask; 1522 return; 1523 } 1524 case ISD::UDIV: { 1525 // For the purposes of computing leading zeros we can conservatively 1526 // treat a udiv as a logical right shift by the power of 2 known to 1527 // be less than the denominator. 1528 APInt AllOnes = APInt::getAllOnesValue(BitWidth); 1529 ComputeMaskedBits(Op.getOperand(0), 1530 AllOnes, KnownZero2, KnownOne2, Depth+1); 1531 unsigned LeadZ = KnownZero2.countLeadingOnes(); 1532 1533 KnownOne2.clear(); 1534 KnownZero2.clear(); 1535 ComputeMaskedBits(Op.getOperand(1), 1536 AllOnes, KnownZero2, KnownOne2, Depth+1); 1537 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros(); 1538 if (RHSUnknownLeadingOnes != BitWidth) 1539 LeadZ = std::min(BitWidth, 1540 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1); 1541 1542 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask; 1543 return; 1544 } 1545 case ISD::SELECT: 1546 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1); 1547 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1); 1548 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1549 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1550 1551 // Only known if known in both the LHS and RHS. 1552 KnownOne &= KnownOne2; 1553 KnownZero &= KnownZero2; 1554 return; 1555 case ISD::SELECT_CC: 1556 ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1); 1557 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1); 1558 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1559 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1560 1561 // Only known if known in both the LHS and RHS. 1562 KnownOne &= KnownOne2; 1563 KnownZero &= KnownZero2; 1564 return; 1565 case ISD::SADDO: 1566 case ISD::UADDO: 1567 case ISD::SSUBO: 1568 case ISD::USUBO: 1569 case ISD::SMULO: 1570 case ISD::UMULO: 1571 if (Op.getResNo() != 1) 1572 return; 1573 // The boolean result conforms to getBooleanContents. Fall through. 1574 case ISD::SETCC: 1575 // If we know the result of a setcc has the top bits zero, use this info. 1576 if (TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent && 1577 BitWidth > 1) 1578 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1); 1579 return; 1580 case ISD::SHL: 1581 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0 1582 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1583 unsigned ShAmt = SA->getZExtValue(); 1584 1585 // If the shift count is an invalid immediate, don't do anything. 1586 if (ShAmt >= BitWidth) 1587 return; 1588 1589 ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt), 1590 KnownZero, KnownOne, Depth+1); 1591 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1592 KnownZero <<= ShAmt; 1593 KnownOne <<= ShAmt; 1594 // low bits known zero. 1595 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt); 1596 } 1597 return; 1598 case ISD::SRL: 1599 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0 1600 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1601 unsigned ShAmt = SA->getZExtValue(); 1602 1603 // If the shift count is an invalid immediate, don't do anything. 1604 if (ShAmt >= BitWidth) 1605 return; 1606 1607 ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt), 1608 KnownZero, KnownOne, Depth+1); 1609 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1610 KnownZero = KnownZero.lshr(ShAmt); 1611 KnownOne = KnownOne.lshr(ShAmt); 1612 1613 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask; 1614 KnownZero |= HighBits; // High bits known zero. 1615 } 1616 return; 1617 case ISD::SRA: 1618 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1619 unsigned ShAmt = SA->getZExtValue(); 1620 1621 // If the shift count is an invalid immediate, don't do anything. 1622 if (ShAmt >= BitWidth) 1623 return; 1624 1625 APInt InDemandedMask = (Mask << ShAmt); 1626 // If any of the demanded bits are produced by the sign extension, we also 1627 // demand the input sign bit. 1628 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask; 1629 if (HighBits.getBoolValue()) 1630 InDemandedMask |= APInt::getSignBit(BitWidth); 1631 1632 ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne, 1633 Depth+1); 1634 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1635 KnownZero = KnownZero.lshr(ShAmt); 1636 KnownOne = KnownOne.lshr(ShAmt); 1637 1638 // Handle the sign bits. 1639 APInt SignBit = APInt::getSignBit(BitWidth); 1640 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask. 1641 1642 if (KnownZero.intersects(SignBit)) { 1643 KnownZero |= HighBits; // New bits are known zero. 1644 } else if (KnownOne.intersects(SignBit)) { 1645 KnownOne |= HighBits; // New bits are known one. 1646 } 1647 } 1648 return; 1649 case ISD::SIGN_EXTEND_INREG: { 1650 MVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT(); 1651 unsigned EBits = EVT.getSizeInBits(); 1652 1653 // Sign extension. Compute the demanded bits in the result that are not 1654 // present in the input. 1655 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask; 1656 1657 APInt InSignBit = APInt::getSignBit(EBits); 1658 APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits); 1659 1660 // If the sign extended bits are demanded, we know that the sign 1661 // bit is demanded. 1662 InSignBit.zext(BitWidth); 1663 if (NewBits.getBoolValue()) 1664 InputDemandedBits |= InSignBit; 1665 1666 ComputeMaskedBits(Op.getOperand(0), InputDemandedBits, 1667 KnownZero, KnownOne, Depth+1); 1668 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1669 1670 // If the sign bit of the input is known set or clear, then we know the 1671 // top bits of the result. 1672 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear 1673 KnownZero |= NewBits; 1674 KnownOne &= ~NewBits; 1675 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set 1676 KnownOne |= NewBits; 1677 KnownZero &= ~NewBits; 1678 } else { // Input sign bit unknown 1679 KnownZero &= ~NewBits; 1680 KnownOne &= ~NewBits; 1681 } 1682 return; 1683 } 1684 case ISD::CTTZ: 1685 case ISD::CTLZ: 1686 case ISD::CTPOP: { 1687 unsigned LowBits = Log2_32(BitWidth)+1; 1688 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits); 1689 KnownOne.clear(); 1690 return; 1691 } 1692 case ISD::LOAD: { 1693 if (ISD::isZEXTLoad(Op.getNode())) { 1694 LoadSDNode *LD = cast<LoadSDNode>(Op); 1695 MVT VT = LD->getMemoryVT(); 1696 unsigned MemBits = VT.getSizeInBits(); 1697 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask; 1698 } 1699 return; 1700 } 1701 case ISD::ZERO_EXTEND: { 1702 MVT InVT = Op.getOperand(0).getValueType(); 1703 unsigned InBits = InVT.getSizeInBits(); 1704 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask; 1705 APInt InMask = Mask; 1706 InMask.trunc(InBits); 1707 KnownZero.trunc(InBits); 1708 KnownOne.trunc(InBits); 1709 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1); 1710 KnownZero.zext(BitWidth); 1711 KnownOne.zext(BitWidth); 1712 KnownZero |= NewBits; 1713 return; 1714 } 1715 case ISD::SIGN_EXTEND: { 1716 MVT InVT = Op.getOperand(0).getValueType(); 1717 unsigned InBits = InVT.getSizeInBits(); 1718 APInt InSignBit = APInt::getSignBit(InBits); 1719 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask; 1720 APInt InMask = Mask; 1721 InMask.trunc(InBits); 1722 1723 // If any of the sign extended bits are demanded, we know that the sign 1724 // bit is demanded. Temporarily set this bit in the mask for our callee. 1725 if (NewBits.getBoolValue()) 1726 InMask |= InSignBit; 1727 1728 KnownZero.trunc(InBits); 1729 KnownOne.trunc(InBits); 1730 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1); 1731 1732 // Note if the sign bit is known to be zero or one. 1733 bool SignBitKnownZero = KnownZero.isNegative(); 1734 bool SignBitKnownOne = KnownOne.isNegative(); 1735 assert(!(SignBitKnownZero && SignBitKnownOne) && 1736 "Sign bit can't be known to be both zero and one!"); 1737 1738 // If the sign bit wasn't actually demanded by our caller, we don't 1739 // want it set in the KnownZero and KnownOne result values. Reset the 1740 // mask and reapply it to the result values. 1741 InMask = Mask; 1742 InMask.trunc(InBits); 1743 KnownZero &= InMask; 1744 KnownOne &= InMask; 1745 1746 KnownZero.zext(BitWidth); 1747 KnownOne.zext(BitWidth); 1748 1749 // If the sign bit is known zero or one, the top bits match. 1750 if (SignBitKnownZero) 1751 KnownZero |= NewBits; 1752 else if (SignBitKnownOne) 1753 KnownOne |= NewBits; 1754 return; 1755 } 1756 case ISD::ANY_EXTEND: { 1757 MVT InVT = Op.getOperand(0).getValueType(); 1758 unsigned InBits = InVT.getSizeInBits(); 1759 APInt InMask = Mask; 1760 InMask.trunc(InBits); 1761 KnownZero.trunc(InBits); 1762 KnownOne.trunc(InBits); 1763 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1); 1764 KnownZero.zext(BitWidth); 1765 KnownOne.zext(BitWidth); 1766 return; 1767 } 1768 case ISD::TRUNCATE: { 1769 MVT InVT = Op.getOperand(0).getValueType(); 1770 unsigned InBits = InVT.getSizeInBits(); 1771 APInt InMask = Mask; 1772 InMask.zext(InBits); 1773 KnownZero.zext(InBits); 1774 KnownOne.zext(InBits); 1775 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1); 1776 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1777 KnownZero.trunc(BitWidth); 1778 KnownOne.trunc(BitWidth); 1779 break; 1780 } 1781 case ISD::AssertZext: { 1782 MVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT(); 1783 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits()); 1784 ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero, 1785 KnownOne, Depth+1); 1786 KnownZero |= (~InMask) & Mask; 1787 return; 1788 } 1789 case ISD::FGETSIGN: 1790 // All bits are zero except the low bit. 1791 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1); 1792 return; 1793 1794 case ISD::SUB: { 1795 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) { 1796 // We know that the top bits of C-X are clear if X contains less bits 1797 // than C (i.e. no wrap-around can happen). For example, 20-X is 1798 // positive if we can prove that X is >= 0 and < 16. 1799 if (CLHS->getAPIntValue().isNonNegative()) { 1800 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros(); 1801 // NLZ can't be BitWidth with no sign bit 1802 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1); 1803 ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2, 1804 Depth+1); 1805 1806 // If all of the MaskV bits are known to be zero, then we know the 1807 // output top bits are zero, because we now know that the output is 1808 // from [0-C]. 1809 if ((KnownZero2 & MaskV) == MaskV) { 1810 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros(); 1811 // Top bits known zero. 1812 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask; 1813 } 1814 } 1815 } 1816 } 1817 // fall through 1818 case ISD::ADD: { 1819 // Output known-0 bits are known if clear or set in both the low clear bits 1820 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the 1821 // low 3 bits clear. 1822 APInt Mask2 = APInt::getLowBitsSet(BitWidth, Mask.countTrailingOnes()); 1823 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1); 1824 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1825 unsigned KnownZeroOut = KnownZero2.countTrailingOnes(); 1826 1827 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1); 1828 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1829 KnownZeroOut = std::min(KnownZeroOut, 1830 KnownZero2.countTrailingOnes()); 1831 1832 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut); 1833 return; 1834 } 1835 case ISD::SREM: 1836 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1837 const APInt &RA = Rem->getAPIntValue(); 1838 if (RA.isPowerOf2() || (-RA).isPowerOf2()) { 1839 APInt LowBits = RA.isStrictlyPositive() ? (RA - 1) : ~RA; 1840 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth); 1841 ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1); 1842 1843 // If the sign bit of the first operand is zero, the sign bit of 1844 // the result is zero. If the first operand has no one bits below 1845 // the second operand's single 1 bit, its sign will be zero. 1846 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits)) 1847 KnownZero2 |= ~LowBits; 1848 1849 KnownZero |= KnownZero2 & Mask; 1850 1851 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?"); 1852 } 1853 } 1854 return; 1855 case ISD::UREM: { 1856 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1857 const APInt &RA = Rem->getAPIntValue(); 1858 if (RA.isPowerOf2()) { 1859 APInt LowBits = (RA - 1); 1860 APInt Mask2 = LowBits & Mask; 1861 KnownZero |= ~LowBits & Mask; 1862 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1); 1863 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?"); 1864 break; 1865 } 1866 } 1867 1868 // Since the result is less than or equal to either operand, any leading 1869 // zero bits in either operand must also exist in the result. 1870 APInt AllOnes = APInt::getAllOnesValue(BitWidth); 1871 ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne, 1872 Depth+1); 1873 ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2, 1874 Depth+1); 1875 1876 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(), 1877 KnownZero2.countLeadingOnes()); 1878 KnownOne.clear(); 1879 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask; 1880 return; 1881 } 1882 default: 1883 // Allow the target to implement this method for its nodes. 1884 if (Op.getOpcode() >= ISD::BUILTIN_OP_END) { 1885 case ISD::INTRINSIC_WO_CHAIN: 1886 case ISD::INTRINSIC_W_CHAIN: 1887 case ISD::INTRINSIC_VOID: 1888 TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this); 1889 } 1890 return; 1891 } 1892} 1893 1894/// ComputeNumSignBits - Return the number of times the sign bit of the 1895/// register is replicated into the other bits. We know that at least 1 bit 1896/// is always equal to the sign bit (itself), but other cases can give us 1897/// information. For example, immediately after an "SRA X, 2", we know that 1898/// the top 3 bits are all equal to each other, so we return 3. 1899unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{ 1900 MVT VT = Op.getValueType(); 1901 assert(VT.isInteger() && "Invalid VT!"); 1902 unsigned VTBits = VT.getSizeInBits(); 1903 unsigned Tmp, Tmp2; 1904 unsigned FirstAnswer = 1; 1905 1906 if (Depth == 6) 1907 return 1; // Limit search depth. 1908 1909 switch (Op.getOpcode()) { 1910 default: break; 1911 case ISD::AssertSext: 1912 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits(); 1913 return VTBits-Tmp+1; 1914 case ISD::AssertZext: 1915 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits(); 1916 return VTBits-Tmp; 1917 1918 case ISD::Constant: { 1919 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue(); 1920 // If negative, return # leading ones. 1921 if (Val.isNegative()) 1922 return Val.countLeadingOnes(); 1923 1924 // Return # leading zeros. 1925 return Val.countLeadingZeros(); 1926 } 1927 1928 case ISD::SIGN_EXTEND: 1929 Tmp = VTBits-Op.getOperand(0).getValueType().getSizeInBits(); 1930 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp; 1931 1932 case ISD::SIGN_EXTEND_INREG: 1933 // Max of the input and what this extends. 1934 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits(); 1935 Tmp = VTBits-Tmp+1; 1936 1937 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1); 1938 return std::max(Tmp, Tmp2); 1939 1940 case ISD::SRA: 1941 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 1942 // SRA X, C -> adds C sign bits. 1943 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1944 Tmp += C->getZExtValue(); 1945 if (Tmp > VTBits) Tmp = VTBits; 1946 } 1947 return Tmp; 1948 case ISD::SHL: 1949 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1950 // shl destroys sign bits. 1951 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 1952 if (C->getZExtValue() >= VTBits || // Bad shift. 1953 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out. 1954 return Tmp - C->getZExtValue(); 1955 } 1956 break; 1957 case ISD::AND: 1958 case ISD::OR: 1959 case ISD::XOR: // NOT is handled here. 1960 // Logical binary ops preserve the number of sign bits at the worst. 1961 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 1962 if (Tmp != 1) { 1963 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 1964 FirstAnswer = std::min(Tmp, Tmp2); 1965 // We computed what we know about the sign bits as our first 1966 // answer. Now proceed to the generic code that uses 1967 // ComputeMaskedBits, and pick whichever answer is better. 1968 } 1969 break; 1970 1971 case ISD::SELECT: 1972 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1); 1973 if (Tmp == 1) return 1; // Early out. 1974 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1); 1975 return std::min(Tmp, Tmp2); 1976 1977 case ISD::SADDO: 1978 case ISD::UADDO: 1979 case ISD::SSUBO: 1980 case ISD::USUBO: 1981 case ISD::SMULO: 1982 case ISD::UMULO: 1983 if (Op.getResNo() != 1) 1984 break; 1985 // The boolean result conforms to getBooleanContents. Fall through. 1986 case ISD::SETCC: 1987 // If setcc returns 0/-1, all bits are sign bits. 1988 if (TLI.getBooleanContents() == 1989 TargetLowering::ZeroOrNegativeOneBooleanContent) 1990 return VTBits; 1991 break; 1992 case ISD::ROTL: 1993 case ISD::ROTR: 1994 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1995 unsigned RotAmt = C->getZExtValue() & (VTBits-1); 1996 1997 // Handle rotate right by N like a rotate left by 32-N. 1998 if (Op.getOpcode() == ISD::ROTR) 1999 RotAmt = (VTBits-RotAmt) & (VTBits-1); 2000 2001 // If we aren't rotating out all of the known-in sign bits, return the 2002 // number that are left. This handles rotl(sext(x), 1) for example. 2003 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2004 if (Tmp > RotAmt+1) return Tmp-RotAmt; 2005 } 2006 break; 2007 case ISD::ADD: 2008 // Add can have at most one carry bit. Thus we know that the output 2009 // is, at worst, one more bit than the inputs. 2010 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2011 if (Tmp == 1) return 1; // Early out. 2012 2013 // Special case decrementing a value (ADD X, -1): 2014 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) 2015 if (CRHS->isAllOnesValue()) { 2016 APInt KnownZero, KnownOne; 2017 APInt Mask = APInt::getAllOnesValue(VTBits); 2018 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1); 2019 2020 // If the input is known to be 0 or 1, the output is 0/-1, which is all 2021 // sign bits set. 2022 if ((KnownZero | APInt(VTBits, 1)) == Mask) 2023 return VTBits; 2024 2025 // If we are subtracting one from a positive number, there is no carry 2026 // out of the result. 2027 if (KnownZero.isNegative()) 2028 return Tmp; 2029 } 2030 2031 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2032 if (Tmp2 == 1) return 1; 2033 return std::min(Tmp, Tmp2)-1; 2034 break; 2035 2036 case ISD::SUB: 2037 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2038 if (Tmp2 == 1) return 1; 2039 2040 // Handle NEG. 2041 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) 2042 if (CLHS->isNullValue()) { 2043 APInt KnownZero, KnownOne; 2044 APInt Mask = APInt::getAllOnesValue(VTBits); 2045 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 2046 // If the input is known to be 0 or 1, the output is 0/-1, which is all 2047 // sign bits set. 2048 if ((KnownZero | APInt(VTBits, 1)) == Mask) 2049 return VTBits; 2050 2051 // If the input is known to be positive (the sign bit is known clear), 2052 // the output of the NEG has the same number of sign bits as the input. 2053 if (KnownZero.isNegative()) 2054 return Tmp2; 2055 2056 // Otherwise, we treat this like a SUB. 2057 } 2058 2059 // Sub can have at most one carry bit. Thus we know that the output 2060 // is, at worst, one more bit than the inputs. 2061 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2062 if (Tmp == 1) return 1; // Early out. 2063 return std::min(Tmp, Tmp2)-1; 2064 break; 2065 case ISD::TRUNCATE: 2066 // FIXME: it's tricky to do anything useful for this, but it is an important 2067 // case for targets like X86. 2068 break; 2069 } 2070 2071 // Handle LOADX separately here. EXTLOAD case will fallthrough. 2072 if (Op.getOpcode() == ISD::LOAD) { 2073 LoadSDNode *LD = cast<LoadSDNode>(Op); 2074 unsigned ExtType = LD->getExtensionType(); 2075 switch (ExtType) { 2076 default: break; 2077 case ISD::SEXTLOAD: // '17' bits known 2078 Tmp = LD->getMemoryVT().getSizeInBits(); 2079 return VTBits-Tmp+1; 2080 case ISD::ZEXTLOAD: // '16' bits known 2081 Tmp = LD->getMemoryVT().getSizeInBits(); 2082 return VTBits-Tmp; 2083 } 2084 } 2085 2086 // Allow the target to implement this method for its nodes. 2087 if (Op.getOpcode() >= ISD::BUILTIN_OP_END || 2088 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN || 2089 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN || 2090 Op.getOpcode() == ISD::INTRINSIC_VOID) { 2091 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth); 2092 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits); 2093 } 2094 2095 // Finally, if we can prove that the top bits of the result are 0's or 1's, 2096 // use this information. 2097 APInt KnownZero, KnownOne; 2098 APInt Mask = APInt::getAllOnesValue(VTBits); 2099 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth); 2100 2101 if (KnownZero.isNegative()) { // sign bit is 0 2102 Mask = KnownZero; 2103 } else if (KnownOne.isNegative()) { // sign bit is 1; 2104 Mask = KnownOne; 2105 } else { 2106 // Nothing known. 2107 return FirstAnswer; 2108 } 2109 2110 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine 2111 // the number of identical bits in the top of the input value. 2112 Mask = ~Mask; 2113 Mask <<= Mask.getBitWidth()-VTBits; 2114 // Return # leading zeros. We use 'min' here in case Val was zero before 2115 // shifting. We don't want to return '64' as for an i32 "0". 2116 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros())); 2117} 2118 2119 2120bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const { 2121 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op); 2122 if (!GA) return false; 2123 if (GA->getOffset() != 0) return false; 2124 GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal()); 2125 if (!GV) return false; 2126 MachineModuleInfo *MMI = getMachineModuleInfo(); 2127 return MMI && MMI->hasDebugInfo(); 2128} 2129 2130 2131/// getShuffleScalarElt - Returns the scalar element that will make up the ith 2132/// element of the result of the vector shuffle. 2133SDValue SelectionDAG::getShuffleScalarElt(const SDNode *N, unsigned i) { 2134 MVT VT = N->getValueType(0); 2135 DebugLoc dl = N->getDebugLoc(); 2136 SDValue PermMask = N->getOperand(2); 2137 SDValue Idx = PermMask.getOperand(i); 2138 if (Idx.getOpcode() == ISD::UNDEF) 2139 return getNode(ISD::UNDEF, dl, VT.getVectorElementType()); 2140 unsigned Index = cast<ConstantSDNode>(Idx)->getZExtValue(); 2141 unsigned NumElems = PermMask.getNumOperands(); 2142 SDValue V = (Index < NumElems) ? N->getOperand(0) : N->getOperand(1); 2143 Index %= NumElems; 2144 2145 if (V.getOpcode() == ISD::BIT_CONVERT) { 2146 V = V.getOperand(0); 2147 MVT VVT = V.getValueType(); 2148 if (!VVT.isVector() || VVT.getVectorNumElements() != NumElems) 2149 return SDValue(); 2150 } 2151 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR) 2152 return (Index == 0) ? V.getOperand(0) 2153 : getNode(ISD::UNDEF, dl, VT.getVectorElementType()); 2154 if (V.getOpcode() == ISD::BUILD_VECTOR) 2155 return V.getOperand(Index); 2156 if (V.getOpcode() == ISD::VECTOR_SHUFFLE) 2157 return getShuffleScalarElt(V.getNode(), Index); 2158 return SDValue(); 2159} 2160 2161 2162/// getNode - Gets or creates the specified node. 2163/// 2164SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT) { 2165 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT); 2166} 2167 2168SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT) { 2169 FoldingSetNodeID ID; 2170 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0); 2171 void *IP = 0; 2172 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2173 return SDValue(E, 0); 2174 SDNode *N = NodeAllocator.Allocate<SDNode>(); 2175 new (N) SDNode(Opcode, DL, SDNode::getSDVTList(VT)); 2176 CSEMap.InsertNode(N, IP); 2177 2178 AllNodes.push_back(N); 2179#ifndef NDEBUG 2180 VerifyNode(N); 2181#endif 2182 return SDValue(N, 0); 2183} 2184 2185SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, SDValue Operand) { 2186 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, Operand); 2187} 2188 2189SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 2190 MVT VT, SDValue Operand) { 2191 // Constant fold unary operations with an integer constant operand. 2192 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) { 2193 const APInt &Val = C->getAPIntValue(); 2194 unsigned BitWidth = VT.getSizeInBits(); 2195 switch (Opcode) { 2196 default: break; 2197 case ISD::SIGN_EXTEND: 2198 return getConstant(APInt(Val).sextOrTrunc(BitWidth), VT); 2199 case ISD::ANY_EXTEND: 2200 case ISD::ZERO_EXTEND: 2201 case ISD::TRUNCATE: 2202 return getConstant(APInt(Val).zextOrTrunc(BitWidth), VT); 2203 case ISD::UINT_TO_FP: 2204 case ISD::SINT_TO_FP: { 2205 const uint64_t zero[] = {0, 0}; 2206 // No compile time operations on this type. 2207 if (VT==MVT::ppcf128) 2208 break; 2209 APFloat apf = APFloat(APInt(BitWidth, 2, zero)); 2210 (void)apf.convertFromAPInt(Val, 2211 Opcode==ISD::SINT_TO_FP, 2212 APFloat::rmNearestTiesToEven); 2213 return getConstantFP(apf, VT); 2214 } 2215 case ISD::BIT_CONVERT: 2216 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32) 2217 return getConstantFP(Val.bitsToFloat(), VT); 2218 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64) 2219 return getConstantFP(Val.bitsToDouble(), VT); 2220 break; 2221 case ISD::BSWAP: 2222 return getConstant(Val.byteSwap(), VT); 2223 case ISD::CTPOP: 2224 return getConstant(Val.countPopulation(), VT); 2225 case ISD::CTLZ: 2226 return getConstant(Val.countLeadingZeros(), VT); 2227 case ISD::CTTZ: 2228 return getConstant(Val.countTrailingZeros(), VT); 2229 } 2230 } 2231 2232 // Constant fold unary operations with a floating point constant operand. 2233 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) { 2234 APFloat V = C->getValueAPF(); // make copy 2235 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) { 2236 switch (Opcode) { 2237 case ISD::FNEG: 2238 V.changeSign(); 2239 return getConstantFP(V, VT); 2240 case ISD::FABS: 2241 V.clearSign(); 2242 return getConstantFP(V, VT); 2243 case ISD::FP_ROUND: 2244 case ISD::FP_EXTEND: { 2245 bool ignored; 2246 // This can return overflow, underflow, or inexact; we don't care. 2247 // FIXME need to be more flexible about rounding mode. 2248 (void)V.convert(*MVTToAPFloatSemantics(VT), 2249 APFloat::rmNearestTiesToEven, &ignored); 2250 return getConstantFP(V, VT); 2251 } 2252 case ISD::FP_TO_SINT: 2253 case ISD::FP_TO_UINT: { 2254 integerPart x; 2255 bool ignored; 2256 assert(integerPartWidth >= 64); 2257 // FIXME need to be more flexible about rounding mode. 2258 APFloat::opStatus s = V.convertToInteger(&x, 64U, 2259 Opcode==ISD::FP_TO_SINT, 2260 APFloat::rmTowardZero, &ignored); 2261 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual 2262 break; 2263 return getConstant(x, VT); 2264 } 2265 case ISD::BIT_CONVERT: 2266 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32) 2267 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT); 2268 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64) 2269 return getConstant(V.bitcastToAPInt().getZExtValue(), VT); 2270 break; 2271 } 2272 } 2273 } 2274 2275 unsigned OpOpcode = Operand.getNode()->getOpcode(); 2276 switch (Opcode) { 2277 case ISD::TokenFactor: 2278 case ISD::MERGE_VALUES: 2279 case ISD::CONCAT_VECTORS: 2280 return Operand; // Factor, merge or concat of one node? No need. 2281 case ISD::FP_ROUND: assert(0 && "Invalid method to make FP_ROUND node"); 2282 case ISD::FP_EXTEND: 2283 assert(VT.isFloatingPoint() && 2284 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!"); 2285 if (Operand.getValueType() == VT) return Operand; // noop conversion. 2286 if (Operand.getOpcode() == ISD::UNDEF) 2287 return getNode(ISD::UNDEF, DL, VT); 2288 break; 2289 case ISD::SIGN_EXTEND: 2290 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2291 "Invalid SIGN_EXTEND!"); 2292 if (Operand.getValueType() == VT) return Operand; // noop extension 2293 assert(Operand.getValueType().bitsLT(VT) 2294 && "Invalid sext node, dst < src!"); 2295 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 2296 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2297 break; 2298 case ISD::ZERO_EXTEND: 2299 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2300 "Invalid ZERO_EXTEND!"); 2301 if (Operand.getValueType() == VT) return Operand; // noop extension 2302 assert(Operand.getValueType().bitsLT(VT) 2303 && "Invalid zext node, dst < src!"); 2304 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x) 2305 return getNode(ISD::ZERO_EXTEND, DL, VT, 2306 Operand.getNode()->getOperand(0)); 2307 break; 2308 case ISD::ANY_EXTEND: 2309 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2310 "Invalid ANY_EXTEND!"); 2311 if (Operand.getValueType() == VT) return Operand; // noop extension 2312 assert(Operand.getValueType().bitsLT(VT) 2313 && "Invalid anyext node, dst < src!"); 2314 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) 2315 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x) 2316 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2317 break; 2318 case ISD::TRUNCATE: 2319 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2320 "Invalid TRUNCATE!"); 2321 if (Operand.getValueType() == VT) return Operand; // noop truncate 2322 assert(Operand.getValueType().bitsGT(VT) 2323 && "Invalid truncate node, src < dst!"); 2324 if (OpOpcode == ISD::TRUNCATE) 2325 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0)); 2326 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND || 2327 OpOpcode == ISD::ANY_EXTEND) { 2328 // If the source is smaller than the dest, we still need an extend. 2329 if (Operand.getNode()->getOperand(0).getValueType().bitsLT(VT)) 2330 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2331 else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT)) 2332 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0)); 2333 else 2334 return Operand.getNode()->getOperand(0); 2335 } 2336 break; 2337 case ISD::BIT_CONVERT: 2338 // Basic sanity checking. 2339 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits() 2340 && "Cannot BIT_CONVERT between types of different sizes!"); 2341 if (VT == Operand.getValueType()) return Operand; // noop conversion. 2342 if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x) 2343 return getNode(ISD::BIT_CONVERT, DL, VT, Operand.getOperand(0)); 2344 if (OpOpcode == ISD::UNDEF) 2345 return getNode(ISD::UNDEF, DL, VT); 2346 break; 2347 case ISD::SCALAR_TO_VECTOR: 2348 assert(VT.isVector() && !Operand.getValueType().isVector() && 2349 VT.getVectorElementType() == Operand.getValueType() && 2350 "Illegal SCALAR_TO_VECTOR node!"); 2351 if (OpOpcode == ISD::UNDEF) 2352 return getNode(ISD::UNDEF, DL, VT); 2353 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined. 2354 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT && 2355 isa<ConstantSDNode>(Operand.getOperand(1)) && 2356 Operand.getConstantOperandVal(1) == 0 && 2357 Operand.getOperand(0).getValueType() == VT) 2358 return Operand.getOperand(0); 2359 break; 2360 case ISD::FNEG: 2361 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0 2362 if (UnsafeFPMath && OpOpcode == ISD::FSUB) 2363 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1), 2364 Operand.getNode()->getOperand(0)); 2365 if (OpOpcode == ISD::FNEG) // --X -> X 2366 return Operand.getNode()->getOperand(0); 2367 break; 2368 case ISD::FABS: 2369 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X) 2370 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0)); 2371 break; 2372 } 2373 2374 SDNode *N; 2375 SDVTList VTs = getVTList(VT); 2376 if (VT != MVT::Flag) { // Don't CSE flag producing nodes 2377 FoldingSetNodeID ID; 2378 SDValue Ops[1] = { Operand }; 2379 AddNodeIDNode(ID, Opcode, VTs, Ops, 1); 2380 void *IP = 0; 2381 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2382 return SDValue(E, 0); 2383 N = NodeAllocator.Allocate<UnarySDNode>(); 2384 new (N) UnarySDNode(Opcode, DL, VTs, Operand); 2385 CSEMap.InsertNode(N, IP); 2386 } else { 2387 N = NodeAllocator.Allocate<UnarySDNode>(); 2388 new (N) UnarySDNode(Opcode, DL, VTs, Operand); 2389 } 2390 2391 AllNodes.push_back(N); 2392#ifndef NDEBUG 2393 VerifyNode(N); 2394#endif 2395 return SDValue(N, 0); 2396} 2397 2398SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, 2399 MVT VT, 2400 ConstantSDNode *Cst1, 2401 ConstantSDNode *Cst2) { 2402 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue(); 2403 2404 switch (Opcode) { 2405 case ISD::ADD: return getConstant(C1 + C2, VT); 2406 case ISD::SUB: return getConstant(C1 - C2, VT); 2407 case ISD::MUL: return getConstant(C1 * C2, VT); 2408 case ISD::UDIV: 2409 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT); 2410 break; 2411 case ISD::UREM: 2412 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT); 2413 break; 2414 case ISD::SDIV: 2415 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT); 2416 break; 2417 case ISD::SREM: 2418 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT); 2419 break; 2420 case ISD::AND: return getConstant(C1 & C2, VT); 2421 case ISD::OR: return getConstant(C1 | C2, VT); 2422 case ISD::XOR: return getConstant(C1 ^ C2, VT); 2423 case ISD::SHL: return getConstant(C1 << C2, VT); 2424 case ISD::SRL: return getConstant(C1.lshr(C2), VT); 2425 case ISD::SRA: return getConstant(C1.ashr(C2), VT); 2426 case ISD::ROTL: return getConstant(C1.rotl(C2), VT); 2427 case ISD::ROTR: return getConstant(C1.rotr(C2), VT); 2428 default: break; 2429 } 2430 2431 return SDValue(); 2432} 2433 2434SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 2435 SDValue N1, SDValue N2) { 2436 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, N1, N2); 2437} 2438 2439SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 2440 SDValue N1, SDValue N2) { 2441 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode()); 2442 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode()); 2443 switch (Opcode) { 2444 default: break; 2445 case ISD::TokenFactor: 2446 assert(VT == MVT::Other && N1.getValueType() == MVT::Other && 2447 N2.getValueType() == MVT::Other && "Invalid token factor!"); 2448 // Fold trivial token factors. 2449 if (N1.getOpcode() == ISD::EntryToken) return N2; 2450 if (N2.getOpcode() == ISD::EntryToken) return N1; 2451 if (N1 == N2) return N1; 2452 break; 2453 case ISD::CONCAT_VECTORS: 2454 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to 2455 // one big BUILD_VECTOR. 2456 if (N1.getOpcode() == ISD::BUILD_VECTOR && 2457 N2.getOpcode() == ISD::BUILD_VECTOR) { 2458 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end()); 2459 Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end()); 2460 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size()); 2461 } 2462 break; 2463 case ISD::AND: 2464 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() && 2465 N1.getValueType() == VT && "Binary operator types must match!"); 2466 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's 2467 // worth handling here. 2468 if (N2C && N2C->isNullValue()) 2469 return N2; 2470 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X 2471 return N1; 2472 break; 2473 case ISD::OR: 2474 case ISD::XOR: 2475 case ISD::ADD: 2476 case ISD::SUB: 2477 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() && 2478 N1.getValueType() == VT && "Binary operator types must match!"); 2479 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so 2480 // it's worth handling here. 2481 if (N2C && N2C->isNullValue()) 2482 return N1; 2483 break; 2484 case ISD::UDIV: 2485 case ISD::UREM: 2486 case ISD::MULHU: 2487 case ISD::MULHS: 2488 case ISD::MUL: 2489 case ISD::SDIV: 2490 case ISD::SREM: 2491 assert(VT.isInteger() && "This operator does not apply to FP types!"); 2492 // fall through 2493 case ISD::FADD: 2494 case ISD::FSUB: 2495 case ISD::FMUL: 2496 case ISD::FDIV: 2497 case ISD::FREM: 2498 if (UnsafeFPMath) { 2499 if (Opcode == ISD::FADD) { 2500 // 0+x --> x 2501 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1)) 2502 if (CFP->getValueAPF().isZero()) 2503 return N2; 2504 // x+0 --> x 2505 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2)) 2506 if (CFP->getValueAPF().isZero()) 2507 return N1; 2508 } else if (Opcode == ISD::FSUB) { 2509 // x-0 --> x 2510 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2)) 2511 if (CFP->getValueAPF().isZero()) 2512 return N1; 2513 } 2514 } 2515 assert(N1.getValueType() == N2.getValueType() && 2516 N1.getValueType() == VT && "Binary operator types must match!"); 2517 break; 2518 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match. 2519 assert(N1.getValueType() == VT && 2520 N1.getValueType().isFloatingPoint() && 2521 N2.getValueType().isFloatingPoint() && 2522 "Invalid FCOPYSIGN!"); 2523 break; 2524 case ISD::SHL: 2525 case ISD::SRA: 2526 case ISD::SRL: 2527 case ISD::ROTL: 2528 case ISD::ROTR: 2529 assert(VT == N1.getValueType() && 2530 "Shift operators return type must be the same as their first arg"); 2531 assert(VT.isInteger() && N2.getValueType().isInteger() && 2532 "Shifts only work on integers"); 2533 2534 // Always fold shifts of i1 values so the code generator doesn't need to 2535 // handle them. Since we know the size of the shift has to be less than the 2536 // size of the value, the shift/rotate count is guaranteed to be zero. 2537 if (VT == MVT::i1) 2538 return N1; 2539 break; 2540 case ISD::FP_ROUND_INREG: { 2541 MVT EVT = cast<VTSDNode>(N2)->getVT(); 2542 assert(VT == N1.getValueType() && "Not an inreg round!"); 2543 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() && 2544 "Cannot FP_ROUND_INREG integer types"); 2545 assert(EVT.bitsLE(VT) && "Not rounding down!"); 2546 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding. 2547 break; 2548 } 2549 case ISD::FP_ROUND: 2550 assert(VT.isFloatingPoint() && 2551 N1.getValueType().isFloatingPoint() && 2552 VT.bitsLE(N1.getValueType()) && 2553 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!"); 2554 if (N1.getValueType() == VT) return N1; // noop conversion. 2555 break; 2556 case ISD::AssertSext: 2557 case ISD::AssertZext: { 2558 MVT EVT = cast<VTSDNode>(N2)->getVT(); 2559 assert(VT == N1.getValueType() && "Not an inreg extend!"); 2560 assert(VT.isInteger() && EVT.isInteger() && 2561 "Cannot *_EXTEND_INREG FP types"); 2562 assert(EVT.bitsLE(VT) && "Not extending!"); 2563 if (VT == EVT) return N1; // noop assertion. 2564 break; 2565 } 2566 case ISD::SIGN_EXTEND_INREG: { 2567 MVT EVT = cast<VTSDNode>(N2)->getVT(); 2568 assert(VT == N1.getValueType() && "Not an inreg extend!"); 2569 assert(VT.isInteger() && EVT.isInteger() && 2570 "Cannot *_EXTEND_INREG FP types"); 2571 assert(EVT.bitsLE(VT) && "Not extending!"); 2572 if (EVT == VT) return N1; // Not actually extending 2573 2574 if (N1C) { 2575 APInt Val = N1C->getAPIntValue(); 2576 unsigned FromBits = cast<VTSDNode>(N2)->getVT().getSizeInBits(); 2577 Val <<= Val.getBitWidth()-FromBits; 2578 Val = Val.ashr(Val.getBitWidth()-FromBits); 2579 return getConstant(Val, VT); 2580 } 2581 break; 2582 } 2583 case ISD::EXTRACT_VECTOR_ELT: 2584 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF. 2585 if (N1.getOpcode() == ISD::UNDEF) 2586 return getNode(ISD::UNDEF, DL, VT); 2587 2588 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is 2589 // expanding copies of large vectors from registers. 2590 if (N2C && 2591 N1.getOpcode() == ISD::CONCAT_VECTORS && 2592 N1.getNumOperands() > 0) { 2593 unsigned Factor = 2594 N1.getOperand(0).getValueType().getVectorNumElements(); 2595 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, 2596 N1.getOperand(N2C->getZExtValue() / Factor), 2597 getConstant(N2C->getZExtValue() % Factor, 2598 N2.getValueType())); 2599 } 2600 2601 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is 2602 // expanding large vector constants. 2603 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) 2604 return N1.getOperand(N2C->getZExtValue()); 2605 2606 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector 2607 // operations are lowered to scalars. 2608 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) { 2609 // If the indices are the same, return the inserted element. 2610 if (N1.getOperand(2) == N2) 2611 return N1.getOperand(1); 2612 // If the indices are known different, extract the element from 2613 // the original vector. 2614 else if (isa<ConstantSDNode>(N1.getOperand(2)) && 2615 isa<ConstantSDNode>(N2)) 2616 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2); 2617 } 2618 break; 2619 case ISD::EXTRACT_ELEMENT: 2620 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!"); 2621 assert(!N1.getValueType().isVector() && !VT.isVector() && 2622 (N1.getValueType().isInteger() == VT.isInteger()) && 2623 "Wrong types for EXTRACT_ELEMENT!"); 2624 2625 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding 2626 // 64-bit integers into 32-bit parts. Instead of building the extract of 2627 // the BUILD_PAIR, only to have legalize rip it apart, just do it now. 2628 if (N1.getOpcode() == ISD::BUILD_PAIR) 2629 return N1.getOperand(N2C->getZExtValue()); 2630 2631 // EXTRACT_ELEMENT of a constant int is also very common. 2632 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) { 2633 unsigned ElementSize = VT.getSizeInBits(); 2634 unsigned Shift = ElementSize * N2C->getZExtValue(); 2635 APInt ShiftedVal = C->getAPIntValue().lshr(Shift); 2636 return getConstant(ShiftedVal.trunc(ElementSize), VT); 2637 } 2638 break; 2639 case ISD::EXTRACT_SUBVECTOR: 2640 if (N1.getValueType() == VT) // Trivial extraction. 2641 return N1; 2642 break; 2643 } 2644 2645 if (N1C) { 2646 if (N2C) { 2647 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C); 2648 if (SV.getNode()) return SV; 2649 } else { // Cannonicalize constant to RHS if commutative 2650 if (isCommutativeBinOp(Opcode)) { 2651 std::swap(N1C, N2C); 2652 std::swap(N1, N2); 2653 } 2654 } 2655 } 2656 2657 // Constant fold FP operations. 2658 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode()); 2659 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode()); 2660 if (N1CFP) { 2661 if (!N2CFP && isCommutativeBinOp(Opcode)) { 2662 // Cannonicalize constant to RHS if commutative 2663 std::swap(N1CFP, N2CFP); 2664 std::swap(N1, N2); 2665 } else if (N2CFP && VT != MVT::ppcf128) { 2666 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF(); 2667 APFloat::opStatus s; 2668 switch (Opcode) { 2669 case ISD::FADD: 2670 s = V1.add(V2, APFloat::rmNearestTiesToEven); 2671 if (s != APFloat::opInvalidOp) 2672 return getConstantFP(V1, VT); 2673 break; 2674 case ISD::FSUB: 2675 s = V1.subtract(V2, APFloat::rmNearestTiesToEven); 2676 if (s!=APFloat::opInvalidOp) 2677 return getConstantFP(V1, VT); 2678 break; 2679 case ISD::FMUL: 2680 s = V1.multiply(V2, APFloat::rmNearestTiesToEven); 2681 if (s!=APFloat::opInvalidOp) 2682 return getConstantFP(V1, VT); 2683 break; 2684 case ISD::FDIV: 2685 s = V1.divide(V2, APFloat::rmNearestTiesToEven); 2686 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero) 2687 return getConstantFP(V1, VT); 2688 break; 2689 case ISD::FREM : 2690 s = V1.mod(V2, APFloat::rmNearestTiesToEven); 2691 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero) 2692 return getConstantFP(V1, VT); 2693 break; 2694 case ISD::FCOPYSIGN: 2695 V1.copySign(V2); 2696 return getConstantFP(V1, VT); 2697 default: break; 2698 } 2699 } 2700 } 2701 2702 // Canonicalize an UNDEF to the RHS, even over a constant. 2703 if (N1.getOpcode() == ISD::UNDEF) { 2704 if (isCommutativeBinOp(Opcode)) { 2705 std::swap(N1, N2); 2706 } else { 2707 switch (Opcode) { 2708 case ISD::FP_ROUND_INREG: 2709 case ISD::SIGN_EXTEND_INREG: 2710 case ISD::SUB: 2711 case ISD::FSUB: 2712 case ISD::FDIV: 2713 case ISD::FREM: 2714 case ISD::SRA: 2715 return N1; // fold op(undef, arg2) -> undef 2716 case ISD::UDIV: 2717 case ISD::SDIV: 2718 case ISD::UREM: 2719 case ISD::SREM: 2720 case ISD::SRL: 2721 case ISD::SHL: 2722 if (!VT.isVector()) 2723 return getConstant(0, VT); // fold op(undef, arg2) -> 0 2724 // For vectors, we can't easily build an all zero vector, just return 2725 // the LHS. 2726 return N2; 2727 } 2728 } 2729 } 2730 2731 // Fold a bunch of operators when the RHS is undef. 2732 if (N2.getOpcode() == ISD::UNDEF) { 2733 switch (Opcode) { 2734 case ISD::XOR: 2735 if (N1.getOpcode() == ISD::UNDEF) 2736 // Handle undef ^ undef -> 0 special case. This is a common 2737 // idiom (misuse). 2738 return getConstant(0, VT); 2739 // fallthrough 2740 case ISD::ADD: 2741 case ISD::ADDC: 2742 case ISD::ADDE: 2743 case ISD::SUB: 2744 case ISD::FADD: 2745 case ISD::FSUB: 2746 case ISD::FMUL: 2747 case ISD::FDIV: 2748 case ISD::FREM: 2749 case ISD::UDIV: 2750 case ISD::SDIV: 2751 case ISD::UREM: 2752 case ISD::SREM: 2753 return N2; // fold op(arg1, undef) -> undef 2754 case ISD::MUL: 2755 case ISD::AND: 2756 case ISD::SRL: 2757 case ISD::SHL: 2758 if (!VT.isVector()) 2759 return getConstant(0, VT); // fold op(arg1, undef) -> 0 2760 // For vectors, we can't easily build an all zero vector, just return 2761 // the LHS. 2762 return N1; 2763 case ISD::OR: 2764 if (!VT.isVector()) 2765 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT); 2766 // For vectors, we can't easily build an all one vector, just return 2767 // the LHS. 2768 return N1; 2769 case ISD::SRA: 2770 return N1; 2771 } 2772 } 2773 2774 // Memoize this node if possible. 2775 SDNode *N; 2776 SDVTList VTs = getVTList(VT); 2777 if (VT != MVT::Flag) { 2778 SDValue Ops[] = { N1, N2 }; 2779 FoldingSetNodeID ID; 2780 AddNodeIDNode(ID, Opcode, VTs, Ops, 2); 2781 void *IP = 0; 2782 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2783 return SDValue(E, 0); 2784 N = NodeAllocator.Allocate<BinarySDNode>(); 2785 new (N) BinarySDNode(Opcode, DL, VTs, N1, N2); 2786 CSEMap.InsertNode(N, IP); 2787 } else { 2788 N = NodeAllocator.Allocate<BinarySDNode>(); 2789 new (N) BinarySDNode(Opcode, DL, VTs, N1, N2); 2790 } 2791 2792 AllNodes.push_back(N); 2793#ifndef NDEBUG 2794 VerifyNode(N); 2795#endif 2796 return SDValue(N, 0); 2797} 2798 2799SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 2800 SDValue N1, SDValue N2, SDValue N3) { 2801 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, N1, N2, N3); 2802} 2803 2804SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 2805 SDValue N1, SDValue N2, SDValue N3) { 2806 // Perform various simplifications. 2807 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode()); 2808 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode()); 2809 switch (Opcode) { 2810 case ISD::CONCAT_VECTORS: 2811 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to 2812 // one big BUILD_VECTOR. 2813 if (N1.getOpcode() == ISD::BUILD_VECTOR && 2814 N2.getOpcode() == ISD::BUILD_VECTOR && 2815 N3.getOpcode() == ISD::BUILD_VECTOR) { 2816 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end()); 2817 Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end()); 2818 Elts.insert(Elts.end(), N3.getNode()->op_begin(), N3.getNode()->op_end()); 2819 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size()); 2820 } 2821 break; 2822 case ISD::SETCC: { 2823 // Use FoldSetCC to simplify SETCC's. 2824 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL); 2825 if (Simp.getNode()) return Simp; 2826 break; 2827 } 2828 case ISD::SELECT: 2829 if (N1C) { 2830 if (N1C->getZExtValue()) 2831 return N2; // select true, X, Y -> X 2832 else 2833 return N3; // select false, X, Y -> Y 2834 } 2835 2836 if (N2 == N3) return N2; // select C, X, X -> X 2837 break; 2838 case ISD::BRCOND: 2839 if (N2C) { 2840 if (N2C->getZExtValue()) // Unconditional branch 2841 return getNode(ISD::BR, DL, MVT::Other, N1, N3); 2842 else 2843 return N1; // Never-taken branch 2844 } 2845 break; 2846 case ISD::VECTOR_SHUFFLE: 2847 assert(N1.getValueType() == N2.getValueType() && 2848 N1.getValueType().isVector() && 2849 VT.isVector() && N3.getValueType().isVector() && 2850 N3.getOpcode() == ISD::BUILD_VECTOR && 2851 VT.getVectorNumElements() == N3.getNumOperands() && 2852 "Illegal VECTOR_SHUFFLE node!"); 2853 break; 2854 case ISD::BIT_CONVERT: 2855 // Fold bit_convert nodes from a type to themselves. 2856 if (N1.getValueType() == VT) 2857 return N1; 2858 break; 2859 } 2860 2861 // Memoize node if it doesn't produce a flag. 2862 SDNode *N; 2863 SDVTList VTs = getVTList(VT); 2864 if (VT != MVT::Flag) { 2865 SDValue Ops[] = { N1, N2, N3 }; 2866 FoldingSetNodeID ID; 2867 AddNodeIDNode(ID, Opcode, VTs, Ops, 3); 2868 void *IP = 0; 2869 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2870 return SDValue(E, 0); 2871 N = NodeAllocator.Allocate<TernarySDNode>(); 2872 new (N) TernarySDNode(Opcode, DL, VTs, N1, N2, N3); 2873 CSEMap.InsertNode(N, IP); 2874 } else { 2875 N = NodeAllocator.Allocate<TernarySDNode>(); 2876 new (N) TernarySDNode(Opcode, DL, VTs, N1, N2, N3); 2877 } 2878 AllNodes.push_back(N); 2879#ifndef NDEBUG 2880 VerifyNode(N); 2881#endif 2882 return SDValue(N, 0); 2883} 2884 2885SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 2886 SDValue N1, SDValue N2, SDValue N3, 2887 SDValue N4) { 2888 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, N1, N2, N3, N4); 2889} 2890 2891SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 2892 SDValue N1, SDValue N2, SDValue N3, 2893 SDValue N4) { 2894 SDValue Ops[] = { N1, N2, N3, N4 }; 2895 return getNode(Opcode, DL, VT, Ops, 4); 2896} 2897 2898SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 2899 SDValue N1, SDValue N2, SDValue N3, 2900 SDValue N4, SDValue N5) { 2901 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, N1, N2, N3, N4, N5); 2902} 2903 2904SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 2905 SDValue N1, SDValue N2, SDValue N3, 2906 SDValue N4, SDValue N5) { 2907 SDValue Ops[] = { N1, N2, N3, N4, N5 }; 2908 return getNode(Opcode, DL, VT, Ops, 5); 2909} 2910 2911/// getMemsetValue - Vectorized representation of the memset value 2912/// operand. 2913static SDValue getMemsetValue(SDValue Value, MVT VT, SelectionDAG &DAG, 2914 DebugLoc dl) { 2915 unsigned NumBits = VT.isVector() ? 2916 VT.getVectorElementType().getSizeInBits() : VT.getSizeInBits(); 2917 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) { 2918 APInt Val = APInt(NumBits, C->getZExtValue() & 255); 2919 unsigned Shift = 8; 2920 for (unsigned i = NumBits; i > 8; i >>= 1) { 2921 Val = (Val << Shift) | Val; 2922 Shift <<= 1; 2923 } 2924 if (VT.isInteger()) 2925 return DAG.getConstant(Val, VT); 2926 return DAG.getConstantFP(APFloat(Val), VT); 2927 } 2928 2929 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 2930 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value); 2931 unsigned Shift = 8; 2932 for (unsigned i = NumBits; i > 8; i >>= 1) { 2933 Value = DAG.getNode(ISD::OR, dl, VT, 2934 DAG.getNode(ISD::SHL, dl, VT, Value, 2935 DAG.getConstant(Shift, 2936 TLI.getShiftAmountTy())), 2937 Value); 2938 Shift <<= 1; 2939 } 2940 2941 return Value; 2942} 2943 2944/// getMemsetStringVal - Similar to getMemsetValue. Except this is only 2945/// used when a memcpy is turned into a memset when the source is a constant 2946/// string ptr. 2947static SDValue getMemsetStringVal(MVT VT, DebugLoc dl, SelectionDAG &DAG, 2948 const TargetLowering &TLI, 2949 std::string &Str, unsigned Offset) { 2950 // Handle vector with all elements zero. 2951 if (Str.empty()) { 2952 if (VT.isInteger()) 2953 return DAG.getConstant(0, VT); 2954 unsigned NumElts = VT.getVectorNumElements(); 2955 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64; 2956 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, 2957 DAG.getConstant(0, MVT::getVectorVT(EltVT, NumElts))); 2958 } 2959 2960 assert(!VT.isVector() && "Can't handle vector type here!"); 2961 unsigned NumBits = VT.getSizeInBits(); 2962 unsigned MSB = NumBits / 8; 2963 uint64_t Val = 0; 2964 if (TLI.isLittleEndian()) 2965 Offset = Offset + MSB - 1; 2966 for (unsigned i = 0; i != MSB; ++i) { 2967 Val = (Val << 8) | (unsigned char)Str[Offset]; 2968 Offset += TLI.isLittleEndian() ? -1 : 1; 2969 } 2970 return DAG.getConstant(Val, VT); 2971} 2972 2973/// getMemBasePlusOffset - Returns base and offset node for the 2974/// 2975static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset, 2976 SelectionDAG &DAG) { 2977 MVT VT = Base.getValueType(); 2978 return DAG.getNode(ISD::ADD, Base.getNode()->getDebugLoc(), 2979 VT, Base, DAG.getConstant(Offset, VT)); 2980} 2981 2982/// isMemSrcFromString - Returns true if memcpy source is a string constant. 2983/// 2984static bool isMemSrcFromString(SDValue Src, std::string &Str) { 2985 unsigned SrcDelta = 0; 2986 GlobalAddressSDNode *G = NULL; 2987 if (Src.getOpcode() == ISD::GlobalAddress) 2988 G = cast<GlobalAddressSDNode>(Src); 2989 else if (Src.getOpcode() == ISD::ADD && 2990 Src.getOperand(0).getOpcode() == ISD::GlobalAddress && 2991 Src.getOperand(1).getOpcode() == ISD::Constant) { 2992 G = cast<GlobalAddressSDNode>(Src.getOperand(0)); 2993 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue(); 2994 } 2995 if (!G) 2996 return false; 2997 2998 GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal()); 2999 if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false)) 3000 return true; 3001 3002 return false; 3003} 3004 3005/// MeetsMaxMemopRequirement - Determines if the number of memory ops required 3006/// to replace the memset / memcpy is below the threshold. It also returns the 3007/// types of the sequence of memory ops to perform memset / memcpy. 3008static 3009bool MeetsMaxMemopRequirement(std::vector<MVT> &MemOps, 3010 SDValue Dst, SDValue Src, 3011 unsigned Limit, uint64_t Size, unsigned &Align, 3012 std::string &Str, bool &isSrcStr, 3013 SelectionDAG &DAG, 3014 const TargetLowering &TLI) { 3015 isSrcStr = isMemSrcFromString(Src, Str); 3016 bool isSrcConst = isa<ConstantSDNode>(Src); 3017 bool AllowUnalign = TLI.allowsUnalignedMemoryAccesses(); 3018 MVT VT = TLI.getOptimalMemOpType(Size, Align, isSrcConst, isSrcStr); 3019 if (VT != MVT::iAny) { 3020 unsigned NewAlign = (unsigned) 3021 TLI.getTargetData()->getABITypeAlignment(VT.getTypeForMVT()); 3022 // If source is a string constant, this will require an unaligned load. 3023 if (NewAlign > Align && (isSrcConst || AllowUnalign)) { 3024 if (Dst.getOpcode() != ISD::FrameIndex) { 3025 // Can't change destination alignment. It requires a unaligned store. 3026 if (AllowUnalign) 3027 VT = MVT::iAny; 3028 } else { 3029 int FI = cast<FrameIndexSDNode>(Dst)->getIndex(); 3030 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 3031 if (MFI->isFixedObjectIndex(FI)) { 3032 // Can't change destination alignment. It requires a unaligned store. 3033 if (AllowUnalign) 3034 VT = MVT::iAny; 3035 } else { 3036 // Give the stack frame object a larger alignment if needed. 3037 if (MFI->getObjectAlignment(FI) < NewAlign) 3038 MFI->setObjectAlignment(FI, NewAlign); 3039 Align = NewAlign; 3040 } 3041 } 3042 } 3043 } 3044 3045 if (VT == MVT::iAny) { 3046 if (AllowUnalign) { 3047 VT = MVT::i64; 3048 } else { 3049 switch (Align & 7) { 3050 case 0: VT = MVT::i64; break; 3051 case 4: VT = MVT::i32; break; 3052 case 2: VT = MVT::i16; break; 3053 default: VT = MVT::i8; break; 3054 } 3055 } 3056 3057 MVT LVT = MVT::i64; 3058 while (!TLI.isTypeLegal(LVT)) 3059 LVT = (MVT::SimpleValueType)(LVT.getSimpleVT() - 1); 3060 assert(LVT.isInteger()); 3061 3062 if (VT.bitsGT(LVT)) 3063 VT = LVT; 3064 } 3065 3066 unsigned NumMemOps = 0; 3067 while (Size != 0) { 3068 unsigned VTSize = VT.getSizeInBits() / 8; 3069 while (VTSize > Size) { 3070 // For now, only use non-vector load / store's for the left-over pieces. 3071 if (VT.isVector()) { 3072 VT = MVT::i64; 3073 while (!TLI.isTypeLegal(VT)) 3074 VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1); 3075 VTSize = VT.getSizeInBits() / 8; 3076 } else { 3077 VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1); 3078 VTSize >>= 1; 3079 } 3080 } 3081 3082 if (++NumMemOps > Limit) 3083 return false; 3084 MemOps.push_back(VT); 3085 Size -= VTSize; 3086 } 3087 3088 return true; 3089} 3090 3091static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl, 3092 SDValue Chain, SDValue Dst, 3093 SDValue Src, uint64_t Size, 3094 unsigned Align, bool AlwaysInline, 3095 const Value *DstSV, uint64_t DstSVOff, 3096 const Value *SrcSV, uint64_t SrcSVOff){ 3097 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3098 3099 // Expand memcpy to a series of load and store ops if the size operand falls 3100 // below a certain threshold. 3101 std::vector<MVT> MemOps; 3102 uint64_t Limit = -1ULL; 3103 if (!AlwaysInline) 3104 Limit = TLI.getMaxStoresPerMemcpy(); 3105 unsigned DstAlign = Align; // Destination alignment can change. 3106 std::string Str; 3107 bool CopyFromStr; 3108 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign, 3109 Str, CopyFromStr, DAG, TLI)) 3110 return SDValue(); 3111 3112 3113 bool isZeroStr = CopyFromStr && Str.empty(); 3114 SmallVector<SDValue, 8> OutChains; 3115 unsigned NumMemOps = MemOps.size(); 3116 uint64_t SrcOff = 0, DstOff = 0; 3117 for (unsigned i = 0; i < NumMemOps; i++) { 3118 MVT VT = MemOps[i]; 3119 unsigned VTSize = VT.getSizeInBits() / 8; 3120 SDValue Value, Store; 3121 3122 if (CopyFromStr && (isZeroStr || !VT.isVector())) { 3123 // It's unlikely a store of a vector immediate can be done in a single 3124 // instruction. It would require a load from a constantpool first. 3125 // We also handle store a vector with all zero's. 3126 // FIXME: Handle other cases where store of vector immediate is done in 3127 // a single instruction. 3128 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str, SrcOff); 3129 Store = DAG.getStore(Chain, dl, Value, 3130 getMemBasePlusOffset(Dst, DstOff, DAG), 3131 DstSV, DstSVOff + DstOff, false, DstAlign); 3132 } else { 3133 Value = DAG.getLoad(VT, dl, Chain, 3134 getMemBasePlusOffset(Src, SrcOff, DAG), 3135 SrcSV, SrcSVOff + SrcOff, false, Align); 3136 Store = DAG.getStore(Chain, dl, Value, 3137 getMemBasePlusOffset(Dst, DstOff, DAG), 3138 DstSV, DstSVOff + DstOff, false, DstAlign); 3139 } 3140 OutChains.push_back(Store); 3141 SrcOff += VTSize; 3142 DstOff += VTSize; 3143 } 3144 3145 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3146 &OutChains[0], OutChains.size()); 3147} 3148 3149static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl, 3150 SDValue Chain, SDValue Dst, 3151 SDValue Src, uint64_t Size, 3152 unsigned Align, bool AlwaysInline, 3153 const Value *DstSV, uint64_t DstSVOff, 3154 const Value *SrcSV, uint64_t SrcSVOff){ 3155 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3156 3157 // Expand memmove to a series of load and store ops if the size operand falls 3158 // below a certain threshold. 3159 std::vector<MVT> MemOps; 3160 uint64_t Limit = -1ULL; 3161 if (!AlwaysInline) 3162 Limit = TLI.getMaxStoresPerMemmove(); 3163 unsigned DstAlign = Align; // Destination alignment can change. 3164 std::string Str; 3165 bool CopyFromStr; 3166 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign, 3167 Str, CopyFromStr, DAG, TLI)) 3168 return SDValue(); 3169 3170 uint64_t SrcOff = 0, DstOff = 0; 3171 3172 SmallVector<SDValue, 8> LoadValues; 3173 SmallVector<SDValue, 8> LoadChains; 3174 SmallVector<SDValue, 8> OutChains; 3175 unsigned NumMemOps = MemOps.size(); 3176 for (unsigned i = 0; i < NumMemOps; i++) { 3177 MVT VT = MemOps[i]; 3178 unsigned VTSize = VT.getSizeInBits() / 8; 3179 SDValue Value, Store; 3180 3181 Value = DAG.getLoad(VT, dl, Chain, 3182 getMemBasePlusOffset(Src, SrcOff, DAG), 3183 SrcSV, SrcSVOff + SrcOff, false, Align); 3184 LoadValues.push_back(Value); 3185 LoadChains.push_back(Value.getValue(1)); 3186 SrcOff += VTSize; 3187 } 3188 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3189 &LoadChains[0], LoadChains.size()); 3190 OutChains.clear(); 3191 for (unsigned i = 0; i < NumMemOps; i++) { 3192 MVT VT = MemOps[i]; 3193 unsigned VTSize = VT.getSizeInBits() / 8; 3194 SDValue Value, Store; 3195 3196 Store = DAG.getStore(Chain, dl, LoadValues[i], 3197 getMemBasePlusOffset(Dst, DstOff, DAG), 3198 DstSV, DstSVOff + DstOff, false, DstAlign); 3199 OutChains.push_back(Store); 3200 DstOff += VTSize; 3201 } 3202 3203 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3204 &OutChains[0], OutChains.size()); 3205} 3206 3207static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl, 3208 SDValue Chain, SDValue Dst, 3209 SDValue Src, uint64_t Size, 3210 unsigned Align, 3211 const Value *DstSV, uint64_t DstSVOff) { 3212 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3213 3214 // Expand memset to a series of load/store ops if the size operand 3215 // falls below a certain threshold. 3216 std::vector<MVT> MemOps; 3217 std::string Str; 3218 bool CopyFromStr; 3219 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, TLI.getMaxStoresPerMemset(), 3220 Size, Align, Str, CopyFromStr, DAG, TLI)) 3221 return SDValue(); 3222 3223 SmallVector<SDValue, 8> OutChains; 3224 uint64_t DstOff = 0; 3225 3226 unsigned NumMemOps = MemOps.size(); 3227 for (unsigned i = 0; i < NumMemOps; i++) { 3228 MVT VT = MemOps[i]; 3229 unsigned VTSize = VT.getSizeInBits() / 8; 3230 SDValue Value = getMemsetValue(Src, VT, DAG, dl); 3231 SDValue Store = DAG.getStore(Chain, dl, Value, 3232 getMemBasePlusOffset(Dst, DstOff, DAG), 3233 DstSV, DstSVOff + DstOff); 3234 OutChains.push_back(Store); 3235 DstOff += VTSize; 3236 } 3237 3238 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3239 &OutChains[0], OutChains.size()); 3240} 3241 3242SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, 3243 SDValue Src, SDValue Size, 3244 unsigned Align, bool AlwaysInline, 3245 const Value *DstSV, uint64_t DstSVOff, 3246 const Value *SrcSV, uint64_t SrcSVOff) { 3247 3248 // Check to see if we should lower the memcpy to loads and stores first. 3249 // For cases within the target-specified limits, this is the best choice. 3250 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3251 if (ConstantSize) { 3252 // Memcpy with size zero? Just return the original chain. 3253 if (ConstantSize->isNullValue()) 3254 return Chain; 3255 3256 SDValue Result = 3257 getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src, 3258 ConstantSize->getZExtValue(), 3259 Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff); 3260 if (Result.getNode()) 3261 return Result; 3262 } 3263 3264 // Then check to see if we should lower the memcpy with target-specific 3265 // code. If the target chooses to do this, this is the next best. 3266 SDValue Result = 3267 TLI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align, 3268 AlwaysInline, 3269 DstSV, DstSVOff, SrcSV, SrcSVOff); 3270 if (Result.getNode()) 3271 return Result; 3272 3273 // If we really need inline code and the target declined to provide it, 3274 // use a (potentially long) sequence of loads and stores. 3275 if (AlwaysInline) { 3276 assert(ConstantSize && "AlwaysInline requires a constant size!"); 3277 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src, 3278 ConstantSize->getZExtValue(), Align, true, 3279 DstSV, DstSVOff, SrcSV, SrcSVOff); 3280 } 3281 3282 // Emit a library call. 3283 TargetLowering::ArgListTy Args; 3284 TargetLowering::ArgListEntry Entry; 3285 Entry.Ty = TLI.getTargetData()->getIntPtrType(); 3286 Entry.Node = Dst; Args.push_back(Entry); 3287 Entry.Node = Src; Args.push_back(Entry); 3288 Entry.Node = Size; Args.push_back(Entry); 3289 // FIXME: pass in DebugLoc 3290 std::pair<SDValue,SDValue> CallResult = 3291 TLI.LowerCallTo(Chain, Type::VoidTy, 3292 false, false, false, false, CallingConv::C, false, 3293 getExternalSymbol("memcpy", TLI.getPointerTy()), 3294 Args, *this, dl); 3295 return CallResult.second; 3296} 3297 3298SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, 3299 SDValue Src, SDValue Size, 3300 unsigned Align, 3301 const Value *DstSV, uint64_t DstSVOff, 3302 const Value *SrcSV, uint64_t SrcSVOff) { 3303 3304 // Check to see if we should lower the memmove to loads and stores first. 3305 // For cases within the target-specified limits, this is the best choice. 3306 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3307 if (ConstantSize) { 3308 // Memmove with size zero? Just return the original chain. 3309 if (ConstantSize->isNullValue()) 3310 return Chain; 3311 3312 SDValue Result = 3313 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src, 3314 ConstantSize->getZExtValue(), 3315 Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff); 3316 if (Result.getNode()) 3317 return Result; 3318 } 3319 3320 // Then check to see if we should lower the memmove with target-specific 3321 // code. If the target chooses to do this, this is the next best. 3322 SDValue Result = 3323 TLI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, 3324 DstSV, DstSVOff, SrcSV, SrcSVOff); 3325 if (Result.getNode()) 3326 return Result; 3327 3328 // Emit a library call. 3329 TargetLowering::ArgListTy Args; 3330 TargetLowering::ArgListEntry Entry; 3331 Entry.Ty = TLI.getTargetData()->getIntPtrType(); 3332 Entry.Node = Dst; Args.push_back(Entry); 3333 Entry.Node = Src; Args.push_back(Entry); 3334 Entry.Node = Size; Args.push_back(Entry); 3335 // FIXME: pass in DebugLoc 3336 std::pair<SDValue,SDValue> CallResult = 3337 TLI.LowerCallTo(Chain, Type::VoidTy, 3338 false, false, false, false, CallingConv::C, false, 3339 getExternalSymbol("memmove", TLI.getPointerTy()), 3340 Args, *this, dl); 3341 return CallResult.second; 3342} 3343 3344SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, 3345 SDValue Src, SDValue Size, 3346 unsigned Align, 3347 const Value *DstSV, uint64_t DstSVOff) { 3348 3349 // Check to see if we should lower the memset to stores first. 3350 // For cases within the target-specified limits, this is the best choice. 3351 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3352 if (ConstantSize) { 3353 // Memset with size zero? Just return the original chain. 3354 if (ConstantSize->isNullValue()) 3355 return Chain; 3356 3357 SDValue Result = 3358 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(), 3359 Align, DstSV, DstSVOff); 3360 if (Result.getNode()) 3361 return Result; 3362 } 3363 3364 // Then check to see if we should lower the memset with target-specific 3365 // code. If the target chooses to do this, this is the next best. 3366 SDValue Result = 3367 TLI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, 3368 DstSV, DstSVOff); 3369 if (Result.getNode()) 3370 return Result; 3371 3372 // Emit a library call. 3373 const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType(); 3374 TargetLowering::ArgListTy Args; 3375 TargetLowering::ArgListEntry Entry; 3376 Entry.Node = Dst; Entry.Ty = IntPtrTy; 3377 Args.push_back(Entry); 3378 // Extend or truncate the argument to be an i32 value for the call. 3379 if (Src.getValueType().bitsGT(MVT::i32)) 3380 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src); 3381 else 3382 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src); 3383 Entry.Node = Src; Entry.Ty = Type::Int32Ty; Entry.isSExt = true; 3384 Args.push_back(Entry); 3385 Entry.Node = Size; Entry.Ty = IntPtrTy; Entry.isSExt = false; 3386 Args.push_back(Entry); 3387 // FIXME: pass in DebugLoc 3388 std::pair<SDValue,SDValue> CallResult = 3389 TLI.LowerCallTo(Chain, Type::VoidTy, 3390 false, false, false, false, CallingConv::C, false, 3391 getExternalSymbol("memset", TLI.getPointerTy()), 3392 Args, *this, dl); 3393 return CallResult.second; 3394} 3395 3396SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, 3397 SDValue Chain, 3398 SDValue Ptr, SDValue Cmp, 3399 SDValue Swp, const Value* PtrVal, 3400 unsigned Alignment) { 3401 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op"); 3402 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types"); 3403 3404 MVT VT = Cmp.getValueType(); 3405 3406 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3407 Alignment = getMVTAlignment(MemVT); 3408 3409 SDVTList VTs = getVTList(VT, MVT::Other); 3410 FoldingSetNodeID ID; 3411 ID.AddInteger(MemVT.getRawBits()); 3412 SDValue Ops[] = {Chain, Ptr, Cmp, Swp}; 3413 AddNodeIDNode(ID, Opcode, VTs, Ops, 4); 3414 void* IP = 0; 3415 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3416 return SDValue(E, 0); 3417 SDNode* N = NodeAllocator.Allocate<AtomicSDNode>(); 3418 new (N) AtomicSDNode(Opcode, dl, VTs, MemVT, 3419 Chain, Ptr, Cmp, Swp, PtrVal, Alignment); 3420 CSEMap.InsertNode(N, IP); 3421 AllNodes.push_back(N); 3422 return SDValue(N, 0); 3423} 3424 3425SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, MVT MemVT, 3426 SDValue Chain, 3427 SDValue Ptr, SDValue Val, 3428 const Value* PtrVal, 3429 unsigned Alignment) { 3430 assert((Opcode == ISD::ATOMIC_LOAD_ADD || 3431 Opcode == ISD::ATOMIC_LOAD_SUB || 3432 Opcode == ISD::ATOMIC_LOAD_AND || 3433 Opcode == ISD::ATOMIC_LOAD_OR || 3434 Opcode == ISD::ATOMIC_LOAD_XOR || 3435 Opcode == ISD::ATOMIC_LOAD_NAND || 3436 Opcode == ISD::ATOMIC_LOAD_MIN || 3437 Opcode == ISD::ATOMIC_LOAD_MAX || 3438 Opcode == ISD::ATOMIC_LOAD_UMIN || 3439 Opcode == ISD::ATOMIC_LOAD_UMAX || 3440 Opcode == ISD::ATOMIC_SWAP) && 3441 "Invalid Atomic Op"); 3442 3443 MVT VT = Val.getValueType(); 3444 3445 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3446 Alignment = getMVTAlignment(MemVT); 3447 3448 SDVTList VTs = getVTList(VT, MVT::Other); 3449 FoldingSetNodeID ID; 3450 ID.AddInteger(MemVT.getRawBits()); 3451 SDValue Ops[] = {Chain, Ptr, Val}; 3452 AddNodeIDNode(ID, Opcode, VTs, Ops, 3); 3453 void* IP = 0; 3454 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3455 return SDValue(E, 0); 3456 SDNode* N = NodeAllocator.Allocate<AtomicSDNode>(); 3457 new (N) AtomicSDNode(Opcode, dl, VTs, MemVT, 3458 Chain, Ptr, Val, PtrVal, Alignment); 3459 CSEMap.InsertNode(N, IP); 3460 AllNodes.push_back(N); 3461 return SDValue(N, 0); 3462} 3463 3464/// getMergeValues - Create a MERGE_VALUES node from the given operands. 3465/// Allowed to return something different (and simpler) if Simplify is true. 3466SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps) { 3467 if (NumOps == 1) 3468 return Ops[0]; 3469 3470 SmallVector<MVT, 4> VTs; 3471 VTs.reserve(NumOps); 3472 for (unsigned i = 0; i < NumOps; ++i) 3473 VTs.push_back(Ops[i].getValueType()); 3474 return getNode(ISD::MERGE_VALUES, getVTList(&VTs[0], NumOps), Ops, NumOps); 3475} 3476 3477/// DebugLoc-aware version. 3478SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps, 3479 DebugLoc dl) { 3480 if (NumOps == 1) 3481 return Ops[0]; 3482 3483 SmallVector<MVT, 4> VTs; 3484 VTs.reserve(NumOps); 3485 for (unsigned i = 0; i < NumOps; ++i) 3486 VTs.push_back(Ops[i].getValueType()); 3487 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps), 3488 Ops, NumOps); 3489} 3490 3491SDValue 3492SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, 3493 const MVT *VTs, unsigned NumVTs, 3494 const SDValue *Ops, unsigned NumOps, 3495 MVT MemVT, const Value *srcValue, int SVOff, 3496 unsigned Align, bool Vol, 3497 bool ReadMem, bool WriteMem) { 3498 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps, 3499 MemVT, srcValue, SVOff, Align, Vol, 3500 ReadMem, WriteMem); 3501} 3502 3503SDValue 3504SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList, 3505 const SDValue *Ops, unsigned NumOps, 3506 MVT MemVT, const Value *srcValue, int SVOff, 3507 unsigned Align, bool Vol, 3508 bool ReadMem, bool WriteMem) { 3509 // Memoize the node unless it returns a flag. 3510 MemIntrinsicSDNode *N; 3511 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) { 3512 FoldingSetNodeID ID; 3513 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 3514 void *IP = 0; 3515 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3516 return SDValue(E, 0); 3517 3518 N = NodeAllocator.Allocate<MemIntrinsicSDNode>(); 3519 new (N) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps, MemVT, 3520 srcValue, SVOff, Align, Vol, ReadMem, WriteMem); 3521 CSEMap.InsertNode(N, IP); 3522 } else { 3523 N = NodeAllocator.Allocate<MemIntrinsicSDNode>(); 3524 new (N) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps, MemVT, 3525 srcValue, SVOff, Align, Vol, ReadMem, WriteMem); 3526 } 3527 AllNodes.push_back(N); 3528 return SDValue(N, 0); 3529} 3530 3531SDValue 3532SelectionDAG::getCall(unsigned CallingConv, DebugLoc dl, bool IsVarArgs, 3533 bool IsTailCall, bool IsInreg, SDVTList VTs, 3534 const SDValue *Operands, unsigned NumOperands) { 3535 // Do not include isTailCall in the folding set profile. 3536 FoldingSetNodeID ID; 3537 AddNodeIDNode(ID, ISD::CALL, VTs, Operands, NumOperands); 3538 ID.AddInteger(CallingConv); 3539 ID.AddInteger(IsVarArgs); 3540 void *IP = 0; 3541 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 3542 // Instead of including isTailCall in the folding set, we just 3543 // set the flag of the existing node. 3544 if (!IsTailCall) 3545 cast<CallSDNode>(E)->setNotTailCall(); 3546 return SDValue(E, 0); 3547 } 3548 SDNode *N = NodeAllocator.Allocate<CallSDNode>(); 3549 new (N) CallSDNode(CallingConv, dl, IsVarArgs, IsTailCall, IsInreg, 3550 VTs, Operands, NumOperands); 3551 CSEMap.InsertNode(N, IP); 3552 AllNodes.push_back(N); 3553 return SDValue(N, 0); 3554} 3555 3556SDValue 3557SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, 3558 MVT VT, SDValue Chain, 3559 SDValue Ptr, SDValue Offset, 3560 const Value *SV, int SVOffset, MVT EVT, 3561 bool isVolatile, unsigned Alignment) { 3562 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3563 Alignment = getMVTAlignment(VT); 3564 3565 if (VT == EVT) { 3566 ExtType = ISD::NON_EXTLOAD; 3567 } else if (ExtType == ISD::NON_EXTLOAD) { 3568 assert(VT == EVT && "Non-extending load from different memory type!"); 3569 } else { 3570 // Extending load. 3571 if (VT.isVector()) 3572 assert(EVT.getVectorNumElements() == VT.getVectorNumElements() && 3573 "Invalid vector extload!"); 3574 else 3575 assert(EVT.bitsLT(VT) && 3576 "Should only be an extending load, not truncating!"); 3577 assert((ExtType == ISD::EXTLOAD || VT.isInteger()) && 3578 "Cannot sign/zero extend a FP/Vector load!"); 3579 assert(VT.isInteger() == EVT.isInteger() && 3580 "Cannot convert from FP to Int or Int -> FP!"); 3581 } 3582 3583 bool Indexed = AM != ISD::UNINDEXED; 3584 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) && 3585 "Unindexed load with an offset!"); 3586 3587 SDVTList VTs = Indexed ? 3588 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other); 3589 SDValue Ops[] = { Chain, Ptr, Offset }; 3590 FoldingSetNodeID ID; 3591 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3); 3592 ID.AddInteger(EVT.getRawBits()); 3593 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, isVolatile, Alignment)); 3594 void *IP = 0; 3595 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3596 return SDValue(E, 0); 3597 SDNode *N = NodeAllocator.Allocate<LoadSDNode>(); 3598 new (N) LoadSDNode(Ops, VTs, AM, ExtType, EVT, SV, SVOffset, 3599 Alignment, isVolatile); 3600 CSEMap.InsertNode(N, IP); 3601 AllNodes.push_back(N); 3602 return SDValue(N, 0); 3603} 3604 3605SDValue 3606SelectionDAG::getLoad(ISD::MemIndexedMode AM, DebugLoc dl, 3607 ISD::LoadExtType ExtType, MVT VT, SDValue Chain, 3608 SDValue Ptr, SDValue Offset, 3609 const Value *SV, int SVOffset, MVT EVT, 3610 bool isVolatile, unsigned Alignment) { 3611 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3612 Alignment = getMVTAlignment(VT); 3613 3614 if (VT == EVT) { 3615 ExtType = ISD::NON_EXTLOAD; 3616 } else if (ExtType == ISD::NON_EXTLOAD) { 3617 assert(VT == EVT && "Non-extending load from different memory type!"); 3618 } else { 3619 // Extending load. 3620 if (VT.isVector()) 3621 assert(EVT.getVectorNumElements() == VT.getVectorNumElements() && 3622 "Invalid vector extload!"); 3623 else 3624 assert(EVT.bitsLT(VT) && 3625 "Should only be an extending load, not truncating!"); 3626 assert((ExtType == ISD::EXTLOAD || VT.isInteger()) && 3627 "Cannot sign/zero extend a FP/Vector load!"); 3628 assert(VT.isInteger() == EVT.isInteger() && 3629 "Cannot convert from FP to Int or Int -> FP!"); 3630 } 3631 3632 bool Indexed = AM != ISD::UNINDEXED; 3633 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) && 3634 "Unindexed load with an offset!"); 3635 3636 SDVTList VTs = Indexed ? 3637 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other); 3638 SDValue Ops[] = { Chain, Ptr, Offset }; 3639 FoldingSetNodeID ID; 3640 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3); 3641 ID.AddInteger(EVT.getRawBits()); 3642 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, isVolatile, Alignment)); 3643 void *IP = 0; 3644 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3645 return SDValue(E, 0); 3646 SDNode *N = NodeAllocator.Allocate<LoadSDNode>(); 3647 new (N) LoadSDNode(Ops, dl, VTs, AM, ExtType, EVT, SV, SVOffset, 3648 Alignment, isVolatile); 3649 CSEMap.InsertNode(N, IP); 3650 AllNodes.push_back(N); 3651 return SDValue(N, 0); 3652} 3653 3654SDValue SelectionDAG::getLoad(MVT VT, 3655 SDValue Chain, SDValue Ptr, 3656 const Value *SV, int SVOffset, 3657 bool isVolatile, unsigned Alignment) { 3658 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3659 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef, 3660 SV, SVOffset, VT, isVolatile, Alignment); 3661} 3662 3663SDValue SelectionDAG::getLoad(MVT VT, DebugLoc dl, 3664 SDValue Chain, SDValue Ptr, 3665 const Value *SV, int SVOffset, 3666 bool isVolatile, unsigned Alignment) { 3667 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3668 return getLoad(ISD::UNINDEXED, dl, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef, 3669 SV, SVOffset, VT, isVolatile, Alignment); 3670} 3671 3672SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT VT, 3673 SDValue Chain, SDValue Ptr, 3674 const Value *SV, 3675 int SVOffset, MVT EVT, 3676 bool isVolatile, unsigned Alignment) { 3677 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3678 return getLoad(ISD::UNINDEXED, ExtType, VT, Chain, Ptr, Undef, 3679 SV, SVOffset, EVT, isVolatile, Alignment); 3680} 3681 3682SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, MVT VT, 3683 SDValue Chain, SDValue Ptr, 3684 const Value *SV, 3685 int SVOffset, MVT EVT, 3686 bool isVolatile, unsigned Alignment) { 3687 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3688 return getLoad(ISD::UNINDEXED, dl, ExtType, VT, Chain, Ptr, Undef, 3689 SV, SVOffset, EVT, isVolatile, Alignment); 3690} 3691 3692SDValue 3693SelectionDAG::getIndexedLoad(SDValue OrigLoad, SDValue Base, 3694 SDValue Offset, ISD::MemIndexedMode AM) { 3695 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad); 3696 assert(LD->getOffset().getOpcode() == ISD::UNDEF && 3697 "Load is already a indexed load!"); 3698 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(), 3699 LD->getChain(), Base, Offset, LD->getSrcValue(), 3700 LD->getSrcValueOffset(), LD->getMemoryVT(), 3701 LD->isVolatile(), LD->getAlignment()); 3702} 3703 3704SDValue 3705SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base, 3706 SDValue Offset, ISD::MemIndexedMode AM) { 3707 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad); 3708 assert(LD->getOffset().getOpcode() == ISD::UNDEF && 3709 "Load is already a indexed load!"); 3710 return getLoad(AM, dl, LD->getExtensionType(), OrigLoad.getValueType(), 3711 LD->getChain(), Base, Offset, LD->getSrcValue(), 3712 LD->getSrcValueOffset(), LD->getMemoryVT(), 3713 LD->isVolatile(), LD->getAlignment()); 3714} 3715 3716SDValue SelectionDAG::getStore(SDValue Chain, SDValue Val, 3717 SDValue Ptr, const Value *SV, int SVOffset, 3718 bool isVolatile, unsigned Alignment) { 3719 MVT VT = Val.getValueType(); 3720 3721 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3722 Alignment = getMVTAlignment(VT); 3723 3724 SDVTList VTs = getVTList(MVT::Other); 3725 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3726 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 3727 FoldingSetNodeID ID; 3728 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3729 ID.AddInteger(VT.getRawBits()); 3730 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, 3731 isVolatile, Alignment)); 3732 void *IP = 0; 3733 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3734 return SDValue(E, 0); 3735 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3736 new (N) StoreSDNode(Ops, VTs, ISD::UNINDEXED, false, 3737 VT, SV, SVOffset, Alignment, isVolatile); 3738 CSEMap.InsertNode(N, IP); 3739 AllNodes.push_back(N); 3740 return SDValue(N, 0); 3741} 3742 3743SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val, 3744 SDValue Ptr, const Value *SV, int SVOffset, 3745 bool isVolatile, unsigned Alignment) { 3746 MVT VT = Val.getValueType(); 3747 3748 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3749 Alignment = getMVTAlignment(VT); 3750 3751 SDVTList VTs = getVTList(MVT::Other); 3752 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3753 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 3754 FoldingSetNodeID ID; 3755 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3756 ID.AddInteger(VT.getRawBits()); 3757 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, 3758 isVolatile, Alignment)); 3759 void *IP = 0; 3760 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3761 return SDValue(E, 0); 3762 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3763 new (N) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED, false, 3764 VT, SV, SVOffset, Alignment, isVolatile); 3765 CSEMap.InsertNode(N, IP); 3766 AllNodes.push_back(N); 3767 return SDValue(N, 0); 3768} 3769 3770SDValue SelectionDAG::getTruncStore(SDValue Chain, SDValue Val, 3771 SDValue Ptr, const Value *SV, 3772 int SVOffset, MVT SVT, 3773 bool isVolatile, unsigned Alignment) { 3774 MVT VT = Val.getValueType(); 3775 3776 if (VT == SVT) 3777 return getStore(Chain, Val, Ptr, SV, SVOffset, isVolatile, Alignment); 3778 3779 assert(VT.bitsGT(SVT) && "Not a truncation?"); 3780 assert(VT.isInteger() == SVT.isInteger() && 3781 "Can't do FP-INT conversion!"); 3782 3783 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3784 Alignment = getMVTAlignment(VT); 3785 3786 SDVTList VTs = getVTList(MVT::Other); 3787 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3788 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 3789 FoldingSetNodeID ID; 3790 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3791 ID.AddInteger(SVT.getRawBits()); 3792 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, 3793 isVolatile, Alignment)); 3794 void *IP = 0; 3795 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3796 return SDValue(E, 0); 3797 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3798 new (N) StoreSDNode(Ops, VTs, ISD::UNINDEXED, true, 3799 SVT, SV, SVOffset, Alignment, isVolatile); 3800 CSEMap.InsertNode(N, IP); 3801 AllNodes.push_back(N); 3802 return SDValue(N, 0); 3803} 3804 3805SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, 3806 SDValue Ptr, const Value *SV, 3807 int SVOffset, MVT SVT, 3808 bool isVolatile, unsigned Alignment) { 3809 MVT VT = Val.getValueType(); 3810 3811 if (VT == SVT) 3812 return getStore(Chain, dl, Val, Ptr, SV, SVOffset, isVolatile, Alignment); 3813 3814 assert(VT.bitsGT(SVT) && "Not a truncation?"); 3815 assert(VT.isInteger() == SVT.isInteger() && 3816 "Can't do FP-INT conversion!"); 3817 3818 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3819 Alignment = getMVTAlignment(VT); 3820 3821 SDVTList VTs = getVTList(MVT::Other); 3822 SDValue Undef = getNode(ISD::UNDEF, Ptr.getValueType()); 3823 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 3824 FoldingSetNodeID ID; 3825 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3826 ID.AddInteger(SVT.getRawBits()); 3827 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, 3828 isVolatile, Alignment)); 3829 void *IP = 0; 3830 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3831 return SDValue(E, 0); 3832 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3833 new (N) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED, true, 3834 SVT, SV, SVOffset, Alignment, isVolatile); 3835 CSEMap.InsertNode(N, IP); 3836 AllNodes.push_back(N); 3837 return SDValue(N, 0); 3838} 3839 3840SDValue 3841SelectionDAG::getIndexedStore(SDValue OrigStore, SDValue Base, 3842 SDValue Offset, ISD::MemIndexedMode AM) { 3843 StoreSDNode *ST = cast<StoreSDNode>(OrigStore); 3844 assert(ST->getOffset().getOpcode() == ISD::UNDEF && 3845 "Store is already a indexed store!"); 3846 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other); 3847 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset }; 3848 FoldingSetNodeID ID; 3849 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3850 ID.AddInteger(ST->getMemoryVT().getRawBits()); 3851 ID.AddInteger(ST->getRawSubclassData()); 3852 void *IP = 0; 3853 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3854 return SDValue(E, 0); 3855 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3856 new (N) StoreSDNode(Ops, VTs, AM, 3857 ST->isTruncatingStore(), ST->getMemoryVT(), 3858 ST->getSrcValue(), ST->getSrcValueOffset(), 3859 ST->getAlignment(), ST->isVolatile()); 3860 CSEMap.InsertNode(N, IP); 3861 AllNodes.push_back(N); 3862 return SDValue(N, 0); 3863} 3864 3865SDValue 3866SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base, 3867 SDValue Offset, ISD::MemIndexedMode AM) { 3868 StoreSDNode *ST = cast<StoreSDNode>(OrigStore); 3869 assert(ST->getOffset().getOpcode() == ISD::UNDEF && 3870 "Store is already a indexed store!"); 3871 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other); 3872 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset }; 3873 FoldingSetNodeID ID; 3874 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 3875 ID.AddInteger(ST->getMemoryVT().getRawBits()); 3876 ID.AddInteger(ST->getRawSubclassData()); 3877 void *IP = 0; 3878 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3879 return SDValue(E, 0); 3880 SDNode *N = NodeAllocator.Allocate<StoreSDNode>(); 3881 new (N) StoreSDNode(Ops, dl, VTs, AM, 3882 ST->isTruncatingStore(), ST->getMemoryVT(), 3883 ST->getSrcValue(), ST->getSrcValueOffset(), 3884 ST->getAlignment(), ST->isVolatile()); 3885 CSEMap.InsertNode(N, IP); 3886 AllNodes.push_back(N); 3887 return SDValue(N, 0); 3888} 3889 3890SDValue SelectionDAG::getVAArg(MVT VT, DebugLoc dl, 3891 SDValue Chain, SDValue Ptr, 3892 SDValue SV) { 3893 SDValue Ops[] = { Chain, Ptr, SV }; 3894 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 3); 3895} 3896 3897SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 3898 const SDUse *Ops, unsigned NumOps) { 3899 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, Ops, NumOps); 3900} 3901 3902SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 3903 const SDUse *Ops, unsigned NumOps) { 3904 switch (NumOps) { 3905 case 0: return getNode(Opcode, DL, VT); 3906 case 1: return getNode(Opcode, DL, VT, Ops[0]); 3907 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]); 3908 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]); 3909 default: break; 3910 } 3911 3912 // Copy from an SDUse array into an SDValue array for use with 3913 // the regular getNode logic. 3914 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps); 3915 return getNode(Opcode, DL, VT, &NewOps[0], NumOps); 3916} 3917 3918SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT, 3919 const SDValue *Ops, unsigned NumOps) { 3920 return getNode(Opcode, DebugLoc::getUnknownLoc(), VT, Ops, NumOps); 3921} 3922 3923SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT, 3924 const SDValue *Ops, unsigned NumOps) { 3925 switch (NumOps) { 3926 case 0: return getNode(Opcode, DL, VT); 3927 case 1: return getNode(Opcode, DL, VT, Ops[0]); 3928 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]); 3929 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]); 3930 default: break; 3931 } 3932 3933 switch (Opcode) { 3934 default: break; 3935 case ISD::SELECT_CC: { 3936 assert(NumOps == 5 && "SELECT_CC takes 5 operands!"); 3937 assert(Ops[0].getValueType() == Ops[1].getValueType() && 3938 "LHS and RHS of condition must have same type!"); 3939 assert(Ops[2].getValueType() == Ops[3].getValueType() && 3940 "True and False arms of SelectCC must have same type!"); 3941 assert(Ops[2].getValueType() == VT && 3942 "select_cc node must be of same type as true and false value!"); 3943 break; 3944 } 3945 case ISD::BR_CC: { 3946 assert(NumOps == 5 && "BR_CC takes 5 operands!"); 3947 assert(Ops[2].getValueType() == Ops[3].getValueType() && 3948 "LHS/RHS of comparison should match types!"); 3949 break; 3950 } 3951 } 3952 3953 // Memoize nodes. 3954 SDNode *N; 3955 SDVTList VTs = getVTList(VT); 3956 3957 if (VT != MVT::Flag) { 3958 FoldingSetNodeID ID; 3959 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps); 3960 void *IP = 0; 3961 3962 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3963 return SDValue(E, 0); 3964 3965 N = NodeAllocator.Allocate<SDNode>(); 3966 new (N) SDNode(Opcode, DL, VTs, Ops, NumOps); 3967 CSEMap.InsertNode(N, IP); 3968 } else { 3969 N = NodeAllocator.Allocate<SDNode>(); 3970 new (N) SDNode(Opcode, DL, VTs, Ops, NumOps); 3971 } 3972 3973 AllNodes.push_back(N); 3974#ifndef NDEBUG 3975 VerifyNode(N); 3976#endif 3977 return SDValue(N, 0); 3978} 3979 3980SDValue SelectionDAG::getNode(unsigned Opcode, 3981 const std::vector<MVT> &ResultTys, 3982 const SDValue *Ops, unsigned NumOps) { 3983 return getNode(Opcode, DebugLoc::getUnknownLoc(), ResultTys, Ops, NumOps); 3984} 3985 3986SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 3987 const std::vector<MVT> &ResultTys, 3988 const SDValue *Ops, unsigned NumOps) { 3989 return getNode(Opcode, DL, getNodeValueTypes(ResultTys), ResultTys.size(), 3990 Ops, NumOps); 3991} 3992 3993SDValue SelectionDAG::getNode(unsigned Opcode, 3994 const MVT *VTs, unsigned NumVTs, 3995 const SDValue *Ops, unsigned NumOps) { 3996 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTs, NumVTs, Ops, NumOps); 3997} 3998 3999SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 4000 const MVT *VTs, unsigned NumVTs, 4001 const SDValue *Ops, unsigned NumOps) { 4002 if (NumVTs == 1) 4003 return getNode(Opcode, DL, VTs[0], Ops, NumOps); 4004 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps); 4005} 4006 4007SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4008 const SDValue *Ops, unsigned NumOps) { 4009 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, Ops, NumOps); 4010} 4011 4012SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4013 const SDValue *Ops, unsigned NumOps) { 4014 if (VTList.NumVTs == 1) 4015 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps); 4016 4017 switch (Opcode) { 4018 // FIXME: figure out how to safely handle things like 4019 // int foo(int x) { return 1 << (x & 255); } 4020 // int bar() { return foo(256); } 4021#if 0 4022 case ISD::SRA_PARTS: 4023 case ISD::SRL_PARTS: 4024 case ISD::SHL_PARTS: 4025 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG && 4026 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1) 4027 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0)); 4028 else if (N3.getOpcode() == ISD::AND) 4029 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) { 4030 // If the and is only masking out bits that cannot effect the shift, 4031 // eliminate the and. 4032 unsigned NumBits = VT.getSizeInBits()*2; 4033 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 4034 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0)); 4035 } 4036 break; 4037#endif 4038 } 4039 4040 // Memoize the node unless it returns a flag. 4041 SDNode *N; 4042 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) { 4043 FoldingSetNodeID ID; 4044 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 4045 void *IP = 0; 4046 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 4047 return SDValue(E, 0); 4048 if (NumOps == 1) { 4049 N = NodeAllocator.Allocate<UnarySDNode>(); 4050 new (N) UnarySDNode(Opcode, DL, VTList, Ops[0]); 4051 } else if (NumOps == 2) { 4052 N = NodeAllocator.Allocate<BinarySDNode>(); 4053 new (N) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]); 4054 } else if (NumOps == 3) { 4055 N = NodeAllocator.Allocate<TernarySDNode>(); 4056 new (N) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1], Ops[2]); 4057 } else { 4058 N = NodeAllocator.Allocate<SDNode>(); 4059 new (N) SDNode(Opcode, DL, VTList, Ops, NumOps); 4060 } 4061 CSEMap.InsertNode(N, IP); 4062 } else { 4063 if (NumOps == 1) { 4064 N = NodeAllocator.Allocate<UnarySDNode>(); 4065 new (N) UnarySDNode(Opcode, DL, VTList, Ops[0]); 4066 } else if (NumOps == 2) { 4067 N = NodeAllocator.Allocate<BinarySDNode>(); 4068 new (N) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]); 4069 } else if (NumOps == 3) { 4070 N = NodeAllocator.Allocate<TernarySDNode>(); 4071 new (N) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1], Ops[2]); 4072 } else { 4073 N = NodeAllocator.Allocate<SDNode>(); 4074 new (N) SDNode(Opcode, DL, VTList, Ops, NumOps); 4075 } 4076 } 4077 AllNodes.push_back(N); 4078#ifndef NDEBUG 4079 VerifyNode(N); 4080#endif 4081 return SDValue(N, 0); 4082} 4083 4084SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList) { 4085 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList); 4086} 4087 4088SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) { 4089 return getNode(Opcode, DL, VTList, 0, 0); 4090} 4091 4092SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4093 SDValue N1) { 4094 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, N1); 4095} 4096 4097SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4098 SDValue N1) { 4099 SDValue Ops[] = { N1 }; 4100 return getNode(Opcode, DL, VTList, Ops, 1); 4101} 4102 4103SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4104 SDValue N1, SDValue N2) { 4105 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, N1, N2); 4106} 4107 4108SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4109 SDValue N1, SDValue N2) { 4110 SDValue Ops[] = { N1, N2 }; 4111 return getNode(Opcode, DL, VTList, Ops, 2); 4112} 4113 4114SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4115 SDValue N1, SDValue N2, SDValue N3) { 4116 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, N1, N2, N3); 4117} 4118 4119SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4120 SDValue N1, SDValue N2, SDValue N3) { 4121 SDValue Ops[] = { N1, N2, N3 }; 4122 return getNode(Opcode, DL, VTList, Ops, 3); 4123} 4124 4125SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4126 SDValue N1, SDValue N2, SDValue N3, 4127 SDValue N4) { 4128 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, N1, N2, N3, N4); 4129} 4130 4131SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4132 SDValue N1, SDValue N2, SDValue N3, 4133 SDValue N4) { 4134 SDValue Ops[] = { N1, N2, N3, N4 }; 4135 return getNode(Opcode, DL, VTList, Ops, 4); 4136} 4137 4138SDValue SelectionDAG::getNode(unsigned Opcode, SDVTList VTList, 4139 SDValue N1, SDValue N2, SDValue N3, 4140 SDValue N4, SDValue N5) { 4141 return getNode(Opcode, DebugLoc::getUnknownLoc(), VTList, N1, N2, N3, N4, N5); 4142} 4143 4144SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4145 SDValue N1, SDValue N2, SDValue N3, 4146 SDValue N4, SDValue N5) { 4147 SDValue Ops[] = { N1, N2, N3, N4, N5 }; 4148 return getNode(Opcode, DL, VTList, Ops, 5); 4149} 4150 4151SDVTList SelectionDAG::getVTList(MVT VT) { 4152 return makeVTList(SDNode::getValueTypeList(VT), 1); 4153} 4154 4155SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2) { 4156 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4157 E = VTList.rend(); I != E; ++I) 4158 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2) 4159 return *I; 4160 4161 MVT *Array = Allocator.Allocate<MVT>(2); 4162 Array[0] = VT1; 4163 Array[1] = VT2; 4164 SDVTList Result = makeVTList(Array, 2); 4165 VTList.push_back(Result); 4166 return Result; 4167} 4168 4169SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2, MVT VT3) { 4170 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4171 E = VTList.rend(); I != E; ++I) 4172 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 && 4173 I->VTs[2] == VT3) 4174 return *I; 4175 4176 MVT *Array = Allocator.Allocate<MVT>(3); 4177 Array[0] = VT1; 4178 Array[1] = VT2; 4179 Array[2] = VT3; 4180 SDVTList Result = makeVTList(Array, 3); 4181 VTList.push_back(Result); 4182 return Result; 4183} 4184 4185SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2, MVT VT3, MVT VT4) { 4186 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4187 E = VTList.rend(); I != E; ++I) 4188 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 && 4189 I->VTs[2] == VT3 && I->VTs[3] == VT4) 4190 return *I; 4191 4192 MVT *Array = Allocator.Allocate<MVT>(3); 4193 Array[0] = VT1; 4194 Array[1] = VT2; 4195 Array[2] = VT3; 4196 Array[3] = VT4; 4197 SDVTList Result = makeVTList(Array, 4); 4198 VTList.push_back(Result); 4199 return Result; 4200} 4201 4202SDVTList SelectionDAG::getVTList(const MVT *VTs, unsigned NumVTs) { 4203 switch (NumVTs) { 4204 case 0: assert(0 && "Cannot have nodes without results!"); 4205 case 1: return getVTList(VTs[0]); 4206 case 2: return getVTList(VTs[0], VTs[1]); 4207 case 3: return getVTList(VTs[0], VTs[1], VTs[2]); 4208 default: break; 4209 } 4210 4211 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4212 E = VTList.rend(); I != E; ++I) { 4213 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1]) 4214 continue; 4215 4216 bool NoMatch = false; 4217 for (unsigned i = 2; i != NumVTs; ++i) 4218 if (VTs[i] != I->VTs[i]) { 4219 NoMatch = true; 4220 break; 4221 } 4222 if (!NoMatch) 4223 return *I; 4224 } 4225 4226 MVT *Array = Allocator.Allocate<MVT>(NumVTs); 4227 std::copy(VTs, VTs+NumVTs, Array); 4228 SDVTList Result = makeVTList(Array, NumVTs); 4229 VTList.push_back(Result); 4230 return Result; 4231} 4232 4233 4234/// UpdateNodeOperands - *Mutate* the specified node in-place to have the 4235/// specified operands. If the resultant node already exists in the DAG, 4236/// this does not modify the specified node, instead it returns the node that 4237/// already exists. If the resultant node does not exist in the DAG, the 4238/// input node is returned. As a degenerate case, if you specify the same 4239/// input operands as the node already has, the input node is returned. 4240SDValue SelectionDAG::UpdateNodeOperands(SDValue InN, SDValue Op) { 4241 SDNode *N = InN.getNode(); 4242 assert(N->getNumOperands() == 1 && "Update with wrong number of operands"); 4243 4244 // Check to see if there is no change. 4245 if (Op == N->getOperand(0)) return InN; 4246 4247 // See if the modified node already exists. 4248 void *InsertPos = 0; 4249 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos)) 4250 return SDValue(Existing, InN.getResNo()); 4251 4252 // Nope it doesn't. Remove the node from its current place in the maps. 4253 if (InsertPos) 4254 if (!RemoveNodeFromCSEMaps(N)) 4255 InsertPos = 0; 4256 4257 // Now we update the operands. 4258 N->OperandList[0].set(Op); 4259 4260 // If this gets put into a CSE map, add it. 4261 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4262 return InN; 4263} 4264 4265SDValue SelectionDAG:: 4266UpdateNodeOperands(SDValue InN, SDValue Op1, SDValue Op2) { 4267 SDNode *N = InN.getNode(); 4268 assert(N->getNumOperands() == 2 && "Update with wrong number of operands"); 4269 4270 // Check to see if there is no change. 4271 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1)) 4272 return InN; // No operands changed, just return the input node. 4273 4274 // See if the modified node already exists. 4275 void *InsertPos = 0; 4276 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos)) 4277 return SDValue(Existing, InN.getResNo()); 4278 4279 // Nope it doesn't. Remove the node from its current place in the maps. 4280 if (InsertPos) 4281 if (!RemoveNodeFromCSEMaps(N)) 4282 InsertPos = 0; 4283 4284 // Now we update the operands. 4285 if (N->OperandList[0] != Op1) 4286 N->OperandList[0].set(Op1); 4287 if (N->OperandList[1] != Op2) 4288 N->OperandList[1].set(Op2); 4289 4290 // If this gets put into a CSE map, add it. 4291 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4292 return InN; 4293} 4294 4295SDValue SelectionDAG:: 4296UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, SDValue Op3) { 4297 SDValue Ops[] = { Op1, Op2, Op3 }; 4298 return UpdateNodeOperands(N, Ops, 3); 4299} 4300 4301SDValue SelectionDAG:: 4302UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 4303 SDValue Op3, SDValue Op4) { 4304 SDValue Ops[] = { Op1, Op2, Op3, Op4 }; 4305 return UpdateNodeOperands(N, Ops, 4); 4306} 4307 4308SDValue SelectionDAG:: 4309UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, 4310 SDValue Op3, SDValue Op4, SDValue Op5) { 4311 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 }; 4312 return UpdateNodeOperands(N, Ops, 5); 4313} 4314 4315SDValue SelectionDAG:: 4316UpdateNodeOperands(SDValue InN, const SDValue *Ops, unsigned NumOps) { 4317 SDNode *N = InN.getNode(); 4318 assert(N->getNumOperands() == NumOps && 4319 "Update with wrong number of operands"); 4320 4321 // Check to see if there is no change. 4322 bool AnyChange = false; 4323 for (unsigned i = 0; i != NumOps; ++i) { 4324 if (Ops[i] != N->getOperand(i)) { 4325 AnyChange = true; 4326 break; 4327 } 4328 } 4329 4330 // No operands changed, just return the input node. 4331 if (!AnyChange) return InN; 4332 4333 // See if the modified node already exists. 4334 void *InsertPos = 0; 4335 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos)) 4336 return SDValue(Existing, InN.getResNo()); 4337 4338 // Nope it doesn't. Remove the node from its current place in the maps. 4339 if (InsertPos) 4340 if (!RemoveNodeFromCSEMaps(N)) 4341 InsertPos = 0; 4342 4343 // Now we update the operands. 4344 for (unsigned i = 0; i != NumOps; ++i) 4345 if (N->OperandList[i] != Ops[i]) 4346 N->OperandList[i].set(Ops[i]); 4347 4348 // If this gets put into a CSE map, add it. 4349 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4350 return InN; 4351} 4352 4353/// DropOperands - Release the operands and set this node to have 4354/// zero operands. 4355void SDNode::DropOperands() { 4356 // Unlike the code in MorphNodeTo that does this, we don't need to 4357 // watch for dead nodes here. 4358 for (op_iterator I = op_begin(), E = op_end(); I != E; ) { 4359 SDUse &Use = *I++; 4360 Use.set(SDValue()); 4361 } 4362} 4363 4364/// SelectNodeTo - These are wrappers around MorphNodeTo that accept a 4365/// machine opcode. 4366/// 4367SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4368 MVT VT) { 4369 SDVTList VTs = getVTList(VT); 4370 return SelectNodeTo(N, MachineOpc, VTs, 0, 0); 4371} 4372 4373SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4374 MVT VT, SDValue Op1) { 4375 SDVTList VTs = getVTList(VT); 4376 SDValue Ops[] = { Op1 }; 4377 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1); 4378} 4379 4380SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4381 MVT VT, SDValue Op1, 4382 SDValue Op2) { 4383 SDVTList VTs = getVTList(VT); 4384 SDValue Ops[] = { Op1, Op2 }; 4385 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2); 4386} 4387 4388SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4389 MVT VT, SDValue Op1, 4390 SDValue Op2, SDValue Op3) { 4391 SDVTList VTs = getVTList(VT); 4392 SDValue Ops[] = { Op1, Op2, Op3 }; 4393 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 4394} 4395 4396SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4397 MVT VT, const SDValue *Ops, 4398 unsigned NumOps) { 4399 SDVTList VTs = getVTList(VT); 4400 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4401} 4402 4403SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4404 MVT VT1, MVT VT2, const SDValue *Ops, 4405 unsigned NumOps) { 4406 SDVTList VTs = getVTList(VT1, VT2); 4407 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4408} 4409 4410SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4411 MVT VT1, MVT VT2) { 4412 SDVTList VTs = getVTList(VT1, VT2); 4413 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0); 4414} 4415 4416SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4417 MVT VT1, MVT VT2, MVT VT3, 4418 const SDValue *Ops, unsigned NumOps) { 4419 SDVTList VTs = getVTList(VT1, VT2, VT3); 4420 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4421} 4422 4423SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4424 MVT VT1, MVT VT2, MVT VT3, MVT VT4, 4425 const SDValue *Ops, unsigned NumOps) { 4426 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4); 4427 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4428} 4429 4430SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4431 MVT VT1, MVT VT2, 4432 SDValue Op1) { 4433 SDVTList VTs = getVTList(VT1, VT2); 4434 SDValue Ops[] = { Op1 }; 4435 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1); 4436} 4437 4438SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4439 MVT VT1, MVT VT2, 4440 SDValue Op1, SDValue Op2) { 4441 SDVTList VTs = getVTList(VT1, VT2); 4442 SDValue Ops[] = { Op1, Op2 }; 4443 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2); 4444} 4445 4446SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4447 MVT VT1, MVT VT2, 4448 SDValue Op1, SDValue Op2, 4449 SDValue Op3) { 4450 SDVTList VTs = getVTList(VT1, VT2); 4451 SDValue Ops[] = { Op1, Op2, Op3 }; 4452 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 4453} 4454 4455SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4456 MVT VT1, MVT VT2, MVT VT3, 4457 SDValue Op1, SDValue Op2, 4458 SDValue Op3) { 4459 SDVTList VTs = getVTList(VT1, VT2, VT3); 4460 SDValue Ops[] = { Op1, Op2, Op3 }; 4461 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 4462} 4463 4464SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4465 SDVTList VTs, const SDValue *Ops, 4466 unsigned NumOps) { 4467 return MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps); 4468} 4469 4470SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4471 MVT VT) { 4472 SDVTList VTs = getVTList(VT); 4473 return MorphNodeTo(N, Opc, VTs, 0, 0); 4474} 4475 4476SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4477 MVT VT, SDValue Op1) { 4478 SDVTList VTs = getVTList(VT); 4479 SDValue Ops[] = { Op1 }; 4480 return MorphNodeTo(N, Opc, VTs, Ops, 1); 4481} 4482 4483SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4484 MVT VT, SDValue Op1, 4485 SDValue Op2) { 4486 SDVTList VTs = getVTList(VT); 4487 SDValue Ops[] = { Op1, Op2 }; 4488 return MorphNodeTo(N, Opc, VTs, Ops, 2); 4489} 4490 4491SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4492 MVT VT, SDValue Op1, 4493 SDValue Op2, SDValue Op3) { 4494 SDVTList VTs = getVTList(VT); 4495 SDValue Ops[] = { Op1, Op2, Op3 }; 4496 return MorphNodeTo(N, Opc, VTs, Ops, 3); 4497} 4498 4499SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4500 MVT VT, const SDValue *Ops, 4501 unsigned NumOps) { 4502 SDVTList VTs = getVTList(VT); 4503 return MorphNodeTo(N, Opc, VTs, Ops, NumOps); 4504} 4505 4506SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4507 MVT VT1, MVT VT2, const SDValue *Ops, 4508 unsigned NumOps) { 4509 SDVTList VTs = getVTList(VT1, VT2); 4510 return MorphNodeTo(N, Opc, VTs, Ops, NumOps); 4511} 4512 4513SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4514 MVT VT1, MVT VT2) { 4515 SDVTList VTs = getVTList(VT1, VT2); 4516 return MorphNodeTo(N, Opc, VTs, (SDValue *)0, 0); 4517} 4518 4519SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4520 MVT VT1, MVT VT2, MVT VT3, 4521 const SDValue *Ops, unsigned NumOps) { 4522 SDVTList VTs = getVTList(VT1, VT2, VT3); 4523 return MorphNodeTo(N, Opc, VTs, Ops, NumOps); 4524} 4525 4526SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4527 MVT VT1, MVT VT2, 4528 SDValue Op1) { 4529 SDVTList VTs = getVTList(VT1, VT2); 4530 SDValue Ops[] = { Op1 }; 4531 return MorphNodeTo(N, Opc, VTs, Ops, 1); 4532} 4533 4534SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4535 MVT VT1, MVT VT2, 4536 SDValue Op1, SDValue Op2) { 4537 SDVTList VTs = getVTList(VT1, VT2); 4538 SDValue Ops[] = { Op1, Op2 }; 4539 return MorphNodeTo(N, Opc, VTs, Ops, 2); 4540} 4541 4542SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4543 MVT VT1, MVT VT2, 4544 SDValue Op1, SDValue Op2, 4545 SDValue Op3) { 4546 SDVTList VTs = getVTList(VT1, VT2); 4547 SDValue Ops[] = { Op1, Op2, Op3 }; 4548 return MorphNodeTo(N, Opc, VTs, Ops, 3); 4549} 4550 4551/// MorphNodeTo - These *mutate* the specified node to have the specified 4552/// return type, opcode, and operands. 4553/// 4554/// Note that MorphNodeTo returns the resultant node. If there is already a 4555/// node of the specified opcode and operands, it returns that node instead of 4556/// the current one. 4557/// 4558/// Using MorphNodeTo is faster than creating a new node and swapping it in 4559/// with ReplaceAllUsesWith both because it often avoids allocating a new 4560/// node, and because it doesn't require CSE recalculation for any of 4561/// the node's users. 4562/// 4563SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 4564 SDVTList VTs, const SDValue *Ops, 4565 unsigned NumOps) { 4566 // If an identical node already exists, use it. 4567 void *IP = 0; 4568 if (VTs.VTs[VTs.NumVTs-1] != MVT::Flag) { 4569 FoldingSetNodeID ID; 4570 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps); 4571 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP)) 4572 return ON; 4573 } 4574 4575 if (!RemoveNodeFromCSEMaps(N)) 4576 IP = 0; 4577 4578 // Start the morphing. 4579 N->NodeType = Opc; 4580 N->ValueList = VTs.VTs; 4581 N->NumValues = VTs.NumVTs; 4582 4583 // Clear the operands list, updating used nodes to remove this from their 4584 // use list. Keep track of any operands that become dead as a result. 4585 SmallPtrSet<SDNode*, 16> DeadNodeSet; 4586 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) { 4587 SDUse &Use = *I++; 4588 SDNode *Used = Use.getNode(); 4589 Use.set(SDValue()); 4590 if (Used->use_empty()) 4591 DeadNodeSet.insert(Used); 4592 } 4593 4594 // If NumOps is larger than the # of operands we currently have, reallocate 4595 // the operand list. 4596 if (NumOps > N->NumOperands) { 4597 if (N->OperandsNeedDelete) 4598 delete[] N->OperandList; 4599 4600 if (N->isMachineOpcode()) { 4601 // We're creating a final node that will live unmorphed for the 4602 // remainder of the current SelectionDAG iteration, so we can allocate 4603 // the operands directly out of a pool with no recycling metadata. 4604 N->OperandList = OperandAllocator.Allocate<SDUse>(NumOps); 4605 N->OperandsNeedDelete = false; 4606 } else { 4607 N->OperandList = new SDUse[NumOps]; 4608 N->OperandsNeedDelete = true; 4609 } 4610 } 4611 4612 // Assign the new operands. 4613 N->NumOperands = NumOps; 4614 for (unsigned i = 0, e = NumOps; i != e; ++i) { 4615 N->OperandList[i].setUser(N); 4616 N->OperandList[i].setInitial(Ops[i]); 4617 } 4618 4619 // Delete any nodes that are still dead after adding the uses for the 4620 // new operands. 4621 SmallVector<SDNode *, 16> DeadNodes; 4622 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(), 4623 E = DeadNodeSet.end(); I != E; ++I) 4624 if ((*I)->use_empty()) 4625 DeadNodes.push_back(*I); 4626 RemoveDeadNodes(DeadNodes); 4627 4628 if (IP) 4629 CSEMap.InsertNode(N, IP); // Memoize the new node. 4630 return N; 4631} 4632 4633 4634/// getTargetNode - These are used for target selectors to create a new node 4635/// with specified return type(s), target opcode, and operands. 4636/// 4637/// Note that getTargetNode returns the resultant node. If there is already a 4638/// node of the specified opcode and operands, it returns that node instead of 4639/// the current one. 4640SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT) { 4641 return getNode(~Opcode, VT).getNode(); 4642} 4643SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT) { 4644 return getNode(~Opcode, dl, VT).getNode(); 4645} 4646 4647SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, SDValue Op1) { 4648 return getNode(~Opcode, VT, Op1).getNode(); 4649} 4650SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 4651 SDValue Op1) { 4652 return getNode(~Opcode, dl, VT, Op1).getNode(); 4653} 4654 4655SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, 4656 SDValue Op1, SDValue Op2) { 4657 return getNode(~Opcode, VT, Op1, Op2).getNode(); 4658} 4659SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 4660 SDValue Op1, SDValue Op2) { 4661 return getNode(~Opcode, dl, VT, Op1, Op2).getNode(); 4662} 4663 4664SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, 4665 SDValue Op1, SDValue Op2, 4666 SDValue Op3) { 4667 return getNode(~Opcode, VT, Op1, Op2, Op3).getNode(); 4668} 4669SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 4670 SDValue Op1, SDValue Op2, 4671 SDValue Op3) { 4672 return getNode(~Opcode, dl, VT, Op1, Op2, Op3).getNode(); 4673} 4674 4675SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, 4676 const SDValue *Ops, unsigned NumOps) { 4677 return getNode(~Opcode, VT, Ops, NumOps).getNode(); 4678} 4679SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT, 4680 const SDValue *Ops, unsigned NumOps) { 4681 return getNode(~Opcode, dl, VT, Ops, NumOps).getNode(); 4682} 4683 4684SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2) { 4685 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4686 SDValue Op; 4687 return getNode(~Opcode, VTs, 2, &Op, 0).getNode(); 4688} 4689SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4690 MVT VT1, MVT VT2) { 4691 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4692 SDValue Op; 4693 return getNode(~Opcode, dl, VTs, 2, &Op, 0).getNode(); 4694} 4695 4696SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, 4697 MVT VT2, SDValue Op1) { 4698 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4699 return getNode(~Opcode, VTs, 2, &Op1, 1).getNode(); 4700} 4701SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 4702 MVT VT2, SDValue Op1) { 4703 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4704 return getNode(~Opcode, dl, VTs, 2, &Op1, 1).getNode(); 4705} 4706 4707SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, 4708 MVT VT2, SDValue Op1, 4709 SDValue Op2) { 4710 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4711 SDValue Ops[] = { Op1, Op2 }; 4712 return getNode(~Opcode, VTs, 2, Ops, 2).getNode(); 4713} 4714SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 4715 MVT VT2, SDValue Op1, 4716 SDValue Op2) { 4717 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4718 SDValue Ops[] = { Op1, Op2 }; 4719 return getNode(~Opcode, dl, VTs, 2, Ops, 2).getNode(); 4720} 4721 4722SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, 4723 MVT VT2, SDValue Op1, 4724 SDValue Op2, SDValue Op3) { 4725 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4726 SDValue Ops[] = { Op1, Op2, Op3 }; 4727 return getNode(~Opcode, VTs, 2, Ops, 3).getNode(); 4728} 4729SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 4730 MVT VT2, SDValue Op1, 4731 SDValue Op2, SDValue Op3) { 4732 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4733 SDValue Ops[] = { Op1, Op2, Op3 }; 4734 return getNode(~Opcode, dl, VTs, 2, Ops, 3).getNode(); 4735} 4736 4737SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, 4738 const SDValue *Ops, unsigned NumOps) { 4739 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4740 return getNode(~Opcode, VTs, 2, Ops, NumOps).getNode(); 4741} 4742SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4743 MVT VT1, MVT VT2, 4744 const SDValue *Ops, unsigned NumOps) { 4745 const MVT *VTs = getNodeValueTypes(VT1, VT2); 4746 return getNode(~Opcode, dl, VTs, 2, Ops, NumOps).getNode(); 4747} 4748 4749SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 4750 SDValue Op1, SDValue Op2) { 4751 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4752 SDValue Ops[] = { Op1, Op2 }; 4753 return getNode(~Opcode, VTs, 3, Ops, 2).getNode(); 4754} 4755SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4756 MVT VT1, MVT VT2, MVT VT3, 4757 SDValue Op1, SDValue Op2) { 4758 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4759 SDValue Ops[] = { Op1, Op2 }; 4760 return getNode(~Opcode, dl, VTs, 3, Ops, 2).getNode(); 4761} 4762 4763SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 4764 SDValue Op1, SDValue Op2, 4765 SDValue Op3) { 4766 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4767 SDValue Ops[] = { Op1, Op2, Op3 }; 4768 return getNode(~Opcode, VTs, 3, Ops, 3).getNode(); 4769} 4770SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4771 MVT VT1, MVT VT2, MVT VT3, 4772 SDValue Op1, SDValue Op2, 4773 SDValue Op3) { 4774 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4775 SDValue Ops[] = { Op1, Op2, Op3 }; 4776 return getNode(~Opcode, dl, VTs, 3, Ops, 3).getNode(); 4777} 4778 4779SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3, 4780 const SDValue *Ops, unsigned NumOps) { 4781 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4782 return getNode(~Opcode, VTs, 3, Ops, NumOps).getNode(); 4783} 4784SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4785 MVT VT1, MVT VT2, MVT VT3, 4786 const SDValue *Ops, unsigned NumOps) { 4787 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3); 4788 return getNode(~Opcode, dl, VTs, 3, Ops, NumOps).getNode(); 4789} 4790 4791SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, 4792 MVT VT2, MVT VT3, MVT VT4, 4793 const SDValue *Ops, unsigned NumOps) { 4794 std::vector<MVT> VTList; 4795 VTList.push_back(VT1); 4796 VTList.push_back(VT2); 4797 VTList.push_back(VT3); 4798 VTList.push_back(VT4); 4799 const MVT *VTs = getNodeValueTypes(VTList); 4800 return getNode(~Opcode, VTs, 4, Ops, NumOps).getNode(); 4801} 4802SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, MVT VT1, 4803 MVT VT2, MVT VT3, MVT VT4, 4804 const SDValue *Ops, unsigned NumOps) { 4805 std::vector<MVT> VTList; 4806 VTList.push_back(VT1); 4807 VTList.push_back(VT2); 4808 VTList.push_back(VT3); 4809 VTList.push_back(VT4); 4810 const MVT *VTs = getNodeValueTypes(VTList); 4811 return getNode(~Opcode, dl, VTs, 4, Ops, NumOps).getNode(); 4812} 4813 4814SDNode *SelectionDAG::getTargetNode(unsigned Opcode, 4815 const std::vector<MVT> &ResultTys, 4816 const SDValue *Ops, unsigned NumOps) { 4817 const MVT *VTs = getNodeValueTypes(ResultTys); 4818 return getNode(~Opcode, VTs, ResultTys.size(), 4819 Ops, NumOps).getNode(); 4820} 4821SDNode *SelectionDAG::getTargetNode(unsigned Opcode, DebugLoc dl, 4822 const std::vector<MVT> &ResultTys, 4823 const SDValue *Ops, unsigned NumOps) { 4824 const MVT *VTs = getNodeValueTypes(ResultTys); 4825 return getNode(~Opcode, dl, VTs, ResultTys.size(), 4826 Ops, NumOps).getNode(); 4827} 4828 4829/// getNodeIfExists - Get the specified node if it's already available, or 4830/// else return NULL. 4831SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList, 4832 const SDValue *Ops, unsigned NumOps) { 4833 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) { 4834 FoldingSetNodeID ID; 4835 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 4836 void *IP = 0; 4837 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 4838 return E; 4839 } 4840 return NULL; 4841} 4842 4843/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 4844/// This can cause recursive merging of nodes in the DAG. 4845/// 4846/// This version assumes From has a single result value. 4847/// 4848void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To, 4849 DAGUpdateListener *UpdateListener) { 4850 SDNode *From = FromN.getNode(); 4851 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 && 4852 "Cannot replace with this method!"); 4853 assert(From != To.getNode() && "Cannot replace uses of with self"); 4854 4855 // Iterate over all the existing uses of From. New uses will be added 4856 // to the beginning of the use list, which we avoid visiting. 4857 // This specifically avoids visiting uses of From that arise while the 4858 // replacement is happening, because any such uses would be the result 4859 // of CSE: If an existing node looks like From after one of its operands 4860 // is replaced by To, we don't want to replace of all its users with To 4861 // too. See PR3018 for more info. 4862 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 4863 while (UI != UE) { 4864 SDNode *User = *UI; 4865 4866 // This node is about to morph, remove its old self from the CSE maps. 4867 RemoveNodeFromCSEMaps(User); 4868 4869 // A user can appear in a use list multiple times, and when this 4870 // happens the uses are usually next to each other in the list. 4871 // To help reduce the number of CSE recomputations, process all 4872 // the uses of this user that we can find this way. 4873 do { 4874 SDUse &Use = UI.getUse(); 4875 ++UI; 4876 Use.set(To); 4877 } while (UI != UE && *UI == User); 4878 4879 // Now that we have modified User, add it back to the CSE maps. If it 4880 // already exists there, recursively merge the results together. 4881 AddModifiedNodeToCSEMaps(User, UpdateListener); 4882 } 4883} 4884 4885/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 4886/// This can cause recursive merging of nodes in the DAG. 4887/// 4888/// This version assumes From/To have matching types and numbers of result 4889/// values. 4890/// 4891void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To, 4892 DAGUpdateListener *UpdateListener) { 4893 assert(From->getVTList().VTs == To->getVTList().VTs && 4894 From->getNumValues() == To->getNumValues() && 4895 "Cannot use this version of ReplaceAllUsesWith!"); 4896 4897 // Handle the trivial case. 4898 if (From == To) 4899 return; 4900 4901 // Iterate over just the existing users of From. See the comments in 4902 // the ReplaceAllUsesWith above. 4903 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 4904 while (UI != UE) { 4905 SDNode *User = *UI; 4906 4907 // This node is about to morph, remove its old self from the CSE maps. 4908 RemoveNodeFromCSEMaps(User); 4909 4910 // A user can appear in a use list multiple times, and when this 4911 // happens the uses are usually next to each other in the list. 4912 // To help reduce the number of CSE recomputations, process all 4913 // the uses of this user that we can find this way. 4914 do { 4915 SDUse &Use = UI.getUse(); 4916 ++UI; 4917 Use.setNode(To); 4918 } while (UI != UE && *UI == User); 4919 4920 // Now that we have modified User, add it back to the CSE maps. If it 4921 // already exists there, recursively merge the results together. 4922 AddModifiedNodeToCSEMaps(User, UpdateListener); 4923 } 4924} 4925 4926/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 4927/// This can cause recursive merging of nodes in the DAG. 4928/// 4929/// This version can replace From with any result values. To must match the 4930/// number and types of values returned by From. 4931void SelectionDAG::ReplaceAllUsesWith(SDNode *From, 4932 const SDValue *To, 4933 DAGUpdateListener *UpdateListener) { 4934 if (From->getNumValues() == 1) // Handle the simple case efficiently. 4935 return ReplaceAllUsesWith(SDValue(From, 0), To[0], UpdateListener); 4936 4937 // Iterate over just the existing users of From. See the comments in 4938 // the ReplaceAllUsesWith above. 4939 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 4940 while (UI != UE) { 4941 SDNode *User = *UI; 4942 4943 // This node is about to morph, remove its old self from the CSE maps. 4944 RemoveNodeFromCSEMaps(User); 4945 4946 // A user can appear in a use list multiple times, and when this 4947 // happens the uses are usually next to each other in the list. 4948 // To help reduce the number of CSE recomputations, process all 4949 // the uses of this user that we can find this way. 4950 do { 4951 SDUse &Use = UI.getUse(); 4952 const SDValue &ToOp = To[Use.getResNo()]; 4953 ++UI; 4954 Use.set(ToOp); 4955 } while (UI != UE && *UI == User); 4956 4957 // Now that we have modified User, add it back to the CSE maps. If it 4958 // already exists there, recursively merge the results together. 4959 AddModifiedNodeToCSEMaps(User, UpdateListener); 4960 } 4961} 4962 4963/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving 4964/// uses of other values produced by From.getNode() alone. The Deleted 4965/// vector is handled the same way as for ReplaceAllUsesWith. 4966void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To, 4967 DAGUpdateListener *UpdateListener){ 4968 // Handle the really simple, really trivial case efficiently. 4969 if (From == To) return; 4970 4971 // Handle the simple, trivial, case efficiently. 4972 if (From.getNode()->getNumValues() == 1) { 4973 ReplaceAllUsesWith(From, To, UpdateListener); 4974 return; 4975 } 4976 4977 // Iterate over just the existing users of From. See the comments in 4978 // the ReplaceAllUsesWith above. 4979 SDNode::use_iterator UI = From.getNode()->use_begin(), 4980 UE = From.getNode()->use_end(); 4981 while (UI != UE) { 4982 SDNode *User = *UI; 4983 bool UserRemovedFromCSEMaps = false; 4984 4985 // A user can appear in a use list multiple times, and when this 4986 // happens the uses are usually next to each other in the list. 4987 // To help reduce the number of CSE recomputations, process all 4988 // the uses of this user that we can find this way. 4989 do { 4990 SDUse &Use = UI.getUse(); 4991 4992 // Skip uses of different values from the same node. 4993 if (Use.getResNo() != From.getResNo()) { 4994 ++UI; 4995 continue; 4996 } 4997 4998 // If this node hasn't been modified yet, it's still in the CSE maps, 4999 // so remove its old self from the CSE maps. 5000 if (!UserRemovedFromCSEMaps) { 5001 RemoveNodeFromCSEMaps(User); 5002 UserRemovedFromCSEMaps = true; 5003 } 5004 5005 ++UI; 5006 Use.set(To); 5007 } while (UI != UE && *UI == User); 5008 5009 // We are iterating over all uses of the From node, so if a use 5010 // doesn't use the specific value, no changes are made. 5011 if (!UserRemovedFromCSEMaps) 5012 continue; 5013 5014 // Now that we have modified User, add it back to the CSE maps. If it 5015 // already exists there, recursively merge the results together. 5016 AddModifiedNodeToCSEMaps(User, UpdateListener); 5017 } 5018} 5019 5020namespace { 5021 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith 5022 /// to record information about a use. 5023 struct UseMemo { 5024 SDNode *User; 5025 unsigned Index; 5026 SDUse *Use; 5027 }; 5028 5029 /// operator< - Sort Memos by User. 5030 bool operator<(const UseMemo &L, const UseMemo &R) { 5031 return (intptr_t)L.User < (intptr_t)R.User; 5032 } 5033} 5034 5035/// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving 5036/// uses of other values produced by From.getNode() alone. The same value 5037/// may appear in both the From and To list. The Deleted vector is 5038/// handled the same way as for ReplaceAllUsesWith. 5039void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From, 5040 const SDValue *To, 5041 unsigned Num, 5042 DAGUpdateListener *UpdateListener){ 5043 // Handle the simple, trivial case efficiently. 5044 if (Num == 1) 5045 return ReplaceAllUsesOfValueWith(*From, *To, UpdateListener); 5046 5047 // Read up all the uses and make records of them. This helps 5048 // processing new uses that are introduced during the 5049 // replacement process. 5050 SmallVector<UseMemo, 4> Uses; 5051 for (unsigned i = 0; i != Num; ++i) { 5052 unsigned FromResNo = From[i].getResNo(); 5053 SDNode *FromNode = From[i].getNode(); 5054 for (SDNode::use_iterator UI = FromNode->use_begin(), 5055 E = FromNode->use_end(); UI != E; ++UI) { 5056 SDUse &Use = UI.getUse(); 5057 if (Use.getResNo() == FromResNo) { 5058 UseMemo Memo = { *UI, i, &Use }; 5059 Uses.push_back(Memo); 5060 } 5061 } 5062 } 5063 5064 // Sort the uses, so that all the uses from a given User are together. 5065 std::sort(Uses.begin(), Uses.end()); 5066 5067 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size(); 5068 UseIndex != UseIndexEnd; ) { 5069 // We know that this user uses some value of From. If it is the right 5070 // value, update it. 5071 SDNode *User = Uses[UseIndex].User; 5072 5073 // This node is about to morph, remove its old self from the CSE maps. 5074 RemoveNodeFromCSEMaps(User); 5075 5076 // The Uses array is sorted, so all the uses for a given User 5077 // are next to each other in the list. 5078 // To help reduce the number of CSE recomputations, process all 5079 // the uses of this user that we can find this way. 5080 do { 5081 unsigned i = Uses[UseIndex].Index; 5082 SDUse &Use = *Uses[UseIndex].Use; 5083 ++UseIndex; 5084 5085 Use.set(To[i]); 5086 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User); 5087 5088 // Now that we have modified User, add it back to the CSE maps. If it 5089 // already exists there, recursively merge the results together. 5090 AddModifiedNodeToCSEMaps(User, UpdateListener); 5091 } 5092} 5093 5094/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG 5095/// based on their topological order. It returns the maximum id and a vector 5096/// of the SDNodes* in assigned order by reference. 5097unsigned SelectionDAG::AssignTopologicalOrder() { 5098 5099 unsigned DAGSize = 0; 5100 5101 // SortedPos tracks the progress of the algorithm. Nodes before it are 5102 // sorted, nodes after it are unsorted. When the algorithm completes 5103 // it is at the end of the list. 5104 allnodes_iterator SortedPos = allnodes_begin(); 5105 5106 // Visit all the nodes. Move nodes with no operands to the front of 5107 // the list immediately. Annotate nodes that do have operands with their 5108 // operand count. Before we do this, the Node Id fields of the nodes 5109 // may contain arbitrary values. After, the Node Id fields for nodes 5110 // before SortedPos will contain the topological sort index, and the 5111 // Node Id fields for nodes At SortedPos and after will contain the 5112 // count of outstanding operands. 5113 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) { 5114 SDNode *N = I++; 5115 unsigned Degree = N->getNumOperands(); 5116 if (Degree == 0) { 5117 // A node with no uses, add it to the result array immediately. 5118 N->setNodeId(DAGSize++); 5119 allnodes_iterator Q = N; 5120 if (Q != SortedPos) 5121 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q)); 5122 ++SortedPos; 5123 } else { 5124 // Temporarily use the Node Id as scratch space for the degree count. 5125 N->setNodeId(Degree); 5126 } 5127 } 5128 5129 // Visit all the nodes. As we iterate, moves nodes into sorted order, 5130 // such that by the time the end is reached all nodes will be sorted. 5131 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) { 5132 SDNode *N = I; 5133 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end(); 5134 UI != UE; ++UI) { 5135 SDNode *P = *UI; 5136 unsigned Degree = P->getNodeId(); 5137 --Degree; 5138 if (Degree == 0) { 5139 // All of P's operands are sorted, so P may sorted now. 5140 P->setNodeId(DAGSize++); 5141 if (P != SortedPos) 5142 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P)); 5143 ++SortedPos; 5144 } else { 5145 // Update P's outstanding operand count. 5146 P->setNodeId(Degree); 5147 } 5148 } 5149 } 5150 5151 assert(SortedPos == AllNodes.end() && 5152 "Topological sort incomplete!"); 5153 assert(AllNodes.front().getOpcode() == ISD::EntryToken && 5154 "First node in topological sort is not the entry token!"); 5155 assert(AllNodes.front().getNodeId() == 0 && 5156 "First node in topological sort has non-zero id!"); 5157 assert(AllNodes.front().getNumOperands() == 0 && 5158 "First node in topological sort has operands!"); 5159 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 && 5160 "Last node in topologic sort has unexpected id!"); 5161 assert(AllNodes.back().use_empty() && 5162 "Last node in topologic sort has users!"); 5163 assert(DAGSize == allnodes_size() && "Node count mismatch!"); 5164 return DAGSize; 5165} 5166 5167 5168 5169//===----------------------------------------------------------------------===// 5170// SDNode Class 5171//===----------------------------------------------------------------------===// 5172 5173HandleSDNode::~HandleSDNode() { 5174 DropOperands(); 5175} 5176 5177GlobalAddressSDNode::GlobalAddressSDNode(bool isTarget, const GlobalValue *GA, 5178 MVT VT, int64_t o) 5179 : SDNode(isa<GlobalVariable>(GA) && 5180 cast<GlobalVariable>(GA)->isThreadLocal() ? 5181 // Thread Local 5182 (isTarget ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress) : 5183 // Non Thread Local 5184 (isTarget ? ISD::TargetGlobalAddress : ISD::GlobalAddress), 5185 getSDVTList(VT)), Offset(o) { 5186 TheGlobal = const_cast<GlobalValue*>(GA); 5187} 5188 5189MemSDNode::MemSDNode(unsigned Opc, SDVTList VTs, MVT memvt, 5190 const Value *srcValue, int SVO, 5191 unsigned alignment, bool vol) 5192 : SDNode(Opc, VTs), MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO) { 5193 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, vol, alignment); 5194 assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!"); 5195 assert(getAlignment() == alignment && "Alignment representation error!"); 5196 assert(isVolatile() == vol && "Volatile representation error!"); 5197} 5198 5199MemSDNode::MemSDNode(unsigned Opc, SDVTList VTs, const SDValue *Ops, 5200 unsigned NumOps, MVT memvt, const Value *srcValue, 5201 int SVO, unsigned alignment, bool vol) 5202 : SDNode(Opc, VTs, Ops, NumOps), 5203 MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO) { 5204 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, vol, alignment); 5205 assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!"); 5206 assert(getAlignment() == alignment && "Alignment representation error!"); 5207 assert(isVolatile() == vol && "Volatile representation error!"); 5208} 5209 5210MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, MVT memvt, 5211 const Value *srcValue, int SVO, 5212 unsigned alignment, bool vol) 5213 : SDNode(Opc, dl, VTs), MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO) { 5214 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, vol, alignment); 5215 assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!"); 5216 assert(getAlignment() == alignment && "Alignment representation error!"); 5217 assert(isVolatile() == vol && "Volatile representation error!"); 5218} 5219 5220MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, 5221 const SDValue *Ops, 5222 unsigned NumOps, MVT memvt, const Value *srcValue, 5223 int SVO, unsigned alignment, bool vol) 5224 : SDNode(Opc, dl, VTs, Ops, NumOps), 5225 MemoryVT(memvt), SrcValue(srcValue), SVOffset(SVO) { 5226 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, vol, alignment); 5227 assert(isPowerOf2_32(alignment) && "Alignment is not a power of 2!"); 5228 assert(getAlignment() == alignment && "Alignment representation error!"); 5229 assert(isVolatile() == vol && "Volatile representation error!"); 5230} 5231 5232/// getMemOperand - Return a MachineMemOperand object describing the memory 5233/// reference performed by this memory reference. 5234MachineMemOperand MemSDNode::getMemOperand() const { 5235 int Flags = 0; 5236 if (isa<LoadSDNode>(this)) 5237 Flags = MachineMemOperand::MOLoad; 5238 else if (isa<StoreSDNode>(this)) 5239 Flags = MachineMemOperand::MOStore; 5240 else if (isa<AtomicSDNode>(this)) { 5241 Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore; 5242 } 5243 else { 5244 const MemIntrinsicSDNode* MemIntrinNode = dyn_cast<MemIntrinsicSDNode>(this); 5245 assert(MemIntrinNode && "Unknown MemSDNode opcode!"); 5246 if (MemIntrinNode->readMem()) Flags |= MachineMemOperand::MOLoad; 5247 if (MemIntrinNode->writeMem()) Flags |= MachineMemOperand::MOStore; 5248 } 5249 5250 int Size = (getMemoryVT().getSizeInBits() + 7) >> 3; 5251 if (isVolatile()) Flags |= MachineMemOperand::MOVolatile; 5252 5253 // Check if the memory reference references a frame index 5254 const FrameIndexSDNode *FI = 5255 dyn_cast<const FrameIndexSDNode>(getBasePtr().getNode()); 5256 if (!getSrcValue() && FI) 5257 return MachineMemOperand(PseudoSourceValue::getFixedStack(FI->getIndex()), 5258 Flags, 0, Size, getAlignment()); 5259 else 5260 return MachineMemOperand(getSrcValue(), Flags, getSrcValueOffset(), 5261 Size, getAlignment()); 5262} 5263 5264/// Profile - Gather unique data for the node. 5265/// 5266void SDNode::Profile(FoldingSetNodeID &ID) const { 5267 AddNodeIDNode(ID, this); 5268} 5269 5270/// getValueTypeList - Return a pointer to the specified value type. 5271/// 5272const MVT *SDNode::getValueTypeList(MVT VT) { 5273 if (VT.isExtended()) { 5274 static std::set<MVT, MVT::compareRawBits> EVTs; 5275 return &(*EVTs.insert(VT).first); 5276 } else { 5277 static MVT VTs[MVT::LAST_VALUETYPE]; 5278 VTs[VT.getSimpleVT()] = VT; 5279 return &VTs[VT.getSimpleVT()]; 5280 } 5281} 5282 5283/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 5284/// indicated value. This method ignores uses of other values defined by this 5285/// operation. 5286bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const { 5287 assert(Value < getNumValues() && "Bad value!"); 5288 5289 // TODO: Only iterate over uses of a given value of the node 5290 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) { 5291 if (UI.getUse().getResNo() == Value) { 5292 if (NUses == 0) 5293 return false; 5294 --NUses; 5295 } 5296 } 5297 5298 // Found exactly the right number of uses? 5299 return NUses == 0; 5300} 5301 5302 5303/// hasAnyUseOfValue - Return true if there are any use of the indicated 5304/// value. This method ignores uses of other values defined by this operation. 5305bool SDNode::hasAnyUseOfValue(unsigned Value) const { 5306 assert(Value < getNumValues() && "Bad value!"); 5307 5308 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) 5309 if (UI.getUse().getResNo() == Value) 5310 return true; 5311 5312 return false; 5313} 5314 5315 5316/// isOnlyUserOf - Return true if this node is the only use of N. 5317/// 5318bool SDNode::isOnlyUserOf(SDNode *N) const { 5319 bool Seen = false; 5320 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) { 5321 SDNode *User = *I; 5322 if (User == this) 5323 Seen = true; 5324 else 5325 return false; 5326 } 5327 5328 return Seen; 5329} 5330 5331/// isOperand - Return true if this node is an operand of N. 5332/// 5333bool SDValue::isOperandOf(SDNode *N) const { 5334 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 5335 if (*this == N->getOperand(i)) 5336 return true; 5337 return false; 5338} 5339 5340bool SDNode::isOperandOf(SDNode *N) const { 5341 for (unsigned i = 0, e = N->NumOperands; i != e; ++i) 5342 if (this == N->OperandList[i].getNode()) 5343 return true; 5344 return false; 5345} 5346 5347/// reachesChainWithoutSideEffects - Return true if this operand (which must 5348/// be a chain) reaches the specified operand without crossing any 5349/// side-effecting instructions. In practice, this looks through token 5350/// factors and non-volatile loads. In order to remain efficient, this only 5351/// looks a couple of nodes in, it does not do an exhaustive search. 5352bool SDValue::reachesChainWithoutSideEffects(SDValue Dest, 5353 unsigned Depth) const { 5354 if (*this == Dest) return true; 5355 5356 // Don't search too deeply, we just want to be able to see through 5357 // TokenFactor's etc. 5358 if (Depth == 0) return false; 5359 5360 // If this is a token factor, all inputs to the TF happen in parallel. If any 5361 // of the operands of the TF reach dest, then we can do the xform. 5362 if (getOpcode() == ISD::TokenFactor) { 5363 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) 5364 if (getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1)) 5365 return true; 5366 return false; 5367 } 5368 5369 // Loads don't have side effects, look through them. 5370 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) { 5371 if (!Ld->isVolatile()) 5372 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1); 5373 } 5374 return false; 5375} 5376 5377 5378static void findPredecessor(SDNode *N, const SDNode *P, bool &found, 5379 SmallPtrSet<SDNode *, 32> &Visited) { 5380 if (found || !Visited.insert(N)) 5381 return; 5382 5383 for (unsigned i = 0, e = N->getNumOperands(); !found && i != e; ++i) { 5384 SDNode *Op = N->getOperand(i).getNode(); 5385 if (Op == P) { 5386 found = true; 5387 return; 5388 } 5389 findPredecessor(Op, P, found, Visited); 5390 } 5391} 5392 5393/// isPredecessorOf - Return true if this node is a predecessor of N. This node 5394/// is either an operand of N or it can be reached by recursively traversing 5395/// up the operands. 5396/// NOTE: this is an expensive method. Use it carefully. 5397bool SDNode::isPredecessorOf(SDNode *N) const { 5398 SmallPtrSet<SDNode *, 32> Visited; 5399 bool found = false; 5400 findPredecessor(N, this, found, Visited); 5401 return found; 5402} 5403 5404uint64_t SDNode::getConstantOperandVal(unsigned Num) const { 5405 assert(Num < NumOperands && "Invalid child # of SDNode!"); 5406 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue(); 5407} 5408 5409std::string SDNode::getOperationName(const SelectionDAG *G) const { 5410 switch (getOpcode()) { 5411 default: 5412 if (getOpcode() < ISD::BUILTIN_OP_END) 5413 return "<<Unknown DAG Node>>"; 5414 if (isMachineOpcode()) { 5415 if (G) 5416 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo()) 5417 if (getMachineOpcode() < TII->getNumOpcodes()) 5418 return TII->get(getMachineOpcode()).getName(); 5419 return "<<Unknown Machine Node>>"; 5420 } 5421 if (G) { 5422 const TargetLowering &TLI = G->getTargetLoweringInfo(); 5423 const char *Name = TLI.getTargetNodeName(getOpcode()); 5424 if (Name) return Name; 5425 return "<<Unknown Target Node>>"; 5426 } 5427 return "<<Unknown Node>>"; 5428 5429#ifndef NDEBUG 5430 case ISD::DELETED_NODE: 5431 return "<<Deleted Node!>>"; 5432#endif 5433 case ISD::PREFETCH: return "Prefetch"; 5434 case ISD::MEMBARRIER: return "MemBarrier"; 5435 case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap"; 5436 case ISD::ATOMIC_SWAP: return "AtomicSwap"; 5437 case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd"; 5438 case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub"; 5439 case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd"; 5440 case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr"; 5441 case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor"; 5442 case ISD::ATOMIC_LOAD_NAND: return "AtomicLoadNand"; 5443 case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin"; 5444 case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax"; 5445 case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin"; 5446 case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax"; 5447 case ISD::PCMARKER: return "PCMarker"; 5448 case ISD::READCYCLECOUNTER: return "ReadCycleCounter"; 5449 case ISD::SRCVALUE: return "SrcValue"; 5450 case ISD::MEMOPERAND: return "MemOperand"; 5451 case ISD::EntryToken: return "EntryToken"; 5452 case ISD::TokenFactor: return "TokenFactor"; 5453 case ISD::AssertSext: return "AssertSext"; 5454 case ISD::AssertZext: return "AssertZext"; 5455 5456 case ISD::BasicBlock: return "BasicBlock"; 5457 case ISD::ARG_FLAGS: return "ArgFlags"; 5458 case ISD::VALUETYPE: return "ValueType"; 5459 case ISD::Register: return "Register"; 5460 5461 case ISD::Constant: return "Constant"; 5462 case ISD::ConstantFP: return "ConstantFP"; 5463 case ISD::GlobalAddress: return "GlobalAddress"; 5464 case ISD::GlobalTLSAddress: return "GlobalTLSAddress"; 5465 case ISD::FrameIndex: return "FrameIndex"; 5466 case ISD::JumpTable: return "JumpTable"; 5467 case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE"; 5468 case ISD::RETURNADDR: return "RETURNADDR"; 5469 case ISD::FRAMEADDR: return "FRAMEADDR"; 5470 case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET"; 5471 case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR"; 5472 case ISD::EHSELECTION: return "EHSELECTION"; 5473 case ISD::EH_RETURN: return "EH_RETURN"; 5474 case ISD::ConstantPool: return "ConstantPool"; 5475 case ISD::ExternalSymbol: return "ExternalSymbol"; 5476 case ISD::INTRINSIC_WO_CHAIN: { 5477 unsigned IID = cast<ConstantSDNode>(getOperand(0))->getZExtValue(); 5478 return Intrinsic::getName((Intrinsic::ID)IID); 5479 } 5480 case ISD::INTRINSIC_VOID: 5481 case ISD::INTRINSIC_W_CHAIN: { 5482 unsigned IID = cast<ConstantSDNode>(getOperand(1))->getZExtValue(); 5483 return Intrinsic::getName((Intrinsic::ID)IID); 5484 } 5485 5486 case ISD::BUILD_VECTOR: return "BUILD_VECTOR"; 5487 case ISD::TargetConstant: return "TargetConstant"; 5488 case ISD::TargetConstantFP:return "TargetConstantFP"; 5489 case ISD::TargetGlobalAddress: return "TargetGlobalAddress"; 5490 case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress"; 5491 case ISD::TargetFrameIndex: return "TargetFrameIndex"; 5492 case ISD::TargetJumpTable: return "TargetJumpTable"; 5493 case ISD::TargetConstantPool: return "TargetConstantPool"; 5494 case ISD::TargetExternalSymbol: return "TargetExternalSymbol"; 5495 5496 case ISD::CopyToReg: return "CopyToReg"; 5497 case ISD::CopyFromReg: return "CopyFromReg"; 5498 case ISD::UNDEF: return "undef"; 5499 case ISD::MERGE_VALUES: return "merge_values"; 5500 case ISD::INLINEASM: return "inlineasm"; 5501 case ISD::DBG_LABEL: return "dbg_label"; 5502 case ISD::EH_LABEL: return "eh_label"; 5503 case ISD::DECLARE: return "declare"; 5504 case ISD::HANDLENODE: return "handlenode"; 5505 case ISD::FORMAL_ARGUMENTS: return "formal_arguments"; 5506 case ISD::CALL: return "call"; 5507 5508 // Unary operators 5509 case ISD::FABS: return "fabs"; 5510 case ISD::FNEG: return "fneg"; 5511 case ISD::FSQRT: return "fsqrt"; 5512 case ISD::FSIN: return "fsin"; 5513 case ISD::FCOS: return "fcos"; 5514 case ISD::FPOWI: return "fpowi"; 5515 case ISD::FPOW: return "fpow"; 5516 case ISD::FTRUNC: return "ftrunc"; 5517 case ISD::FFLOOR: return "ffloor"; 5518 case ISD::FCEIL: return "fceil"; 5519 case ISD::FRINT: return "frint"; 5520 case ISD::FNEARBYINT: return "fnearbyint"; 5521 5522 // Binary operators 5523 case ISD::ADD: return "add"; 5524 case ISD::SUB: return "sub"; 5525 case ISD::MUL: return "mul"; 5526 case ISD::MULHU: return "mulhu"; 5527 case ISD::MULHS: return "mulhs"; 5528 case ISD::SDIV: return "sdiv"; 5529 case ISD::UDIV: return "udiv"; 5530 case ISD::SREM: return "srem"; 5531 case ISD::UREM: return "urem"; 5532 case ISD::SMUL_LOHI: return "smul_lohi"; 5533 case ISD::UMUL_LOHI: return "umul_lohi"; 5534 case ISD::SDIVREM: return "sdivrem"; 5535 case ISD::UDIVREM: return "udivrem"; 5536 case ISD::AND: return "and"; 5537 case ISD::OR: return "or"; 5538 case ISD::XOR: return "xor"; 5539 case ISD::SHL: return "shl"; 5540 case ISD::SRA: return "sra"; 5541 case ISD::SRL: return "srl"; 5542 case ISD::ROTL: return "rotl"; 5543 case ISD::ROTR: return "rotr"; 5544 case ISD::FADD: return "fadd"; 5545 case ISD::FSUB: return "fsub"; 5546 case ISD::FMUL: return "fmul"; 5547 case ISD::FDIV: return "fdiv"; 5548 case ISD::FREM: return "frem"; 5549 case ISD::FCOPYSIGN: return "fcopysign"; 5550 case ISD::FGETSIGN: return "fgetsign"; 5551 5552 case ISD::SETCC: return "setcc"; 5553 case ISD::VSETCC: return "vsetcc"; 5554 case ISD::SELECT: return "select"; 5555 case ISD::SELECT_CC: return "select_cc"; 5556 case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt"; 5557 case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt"; 5558 case ISD::CONCAT_VECTORS: return "concat_vectors"; 5559 case ISD::EXTRACT_SUBVECTOR: return "extract_subvector"; 5560 case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector"; 5561 case ISD::VECTOR_SHUFFLE: return "vector_shuffle"; 5562 case ISD::CARRY_FALSE: return "carry_false"; 5563 case ISD::ADDC: return "addc"; 5564 case ISD::ADDE: return "adde"; 5565 case ISD::SADDO: return "saddo"; 5566 case ISD::UADDO: return "uaddo"; 5567 case ISD::SSUBO: return "ssubo"; 5568 case ISD::USUBO: return "usubo"; 5569 case ISD::SMULO: return "smulo"; 5570 case ISD::UMULO: return "umulo"; 5571 case ISD::SUBC: return "subc"; 5572 case ISD::SUBE: return "sube"; 5573 case ISD::SHL_PARTS: return "shl_parts"; 5574 case ISD::SRA_PARTS: return "sra_parts"; 5575 case ISD::SRL_PARTS: return "srl_parts"; 5576 5577 case ISD::EXTRACT_SUBREG: return "extract_subreg"; 5578 case ISD::INSERT_SUBREG: return "insert_subreg"; 5579 5580 // Conversion operators. 5581 case ISD::SIGN_EXTEND: return "sign_extend"; 5582 case ISD::ZERO_EXTEND: return "zero_extend"; 5583 case ISD::ANY_EXTEND: return "any_extend"; 5584 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 5585 case ISD::TRUNCATE: return "truncate"; 5586 case ISD::FP_ROUND: return "fp_round"; 5587 case ISD::FLT_ROUNDS_: return "flt_rounds"; 5588 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 5589 case ISD::FP_EXTEND: return "fp_extend"; 5590 5591 case ISD::SINT_TO_FP: return "sint_to_fp"; 5592 case ISD::UINT_TO_FP: return "uint_to_fp"; 5593 case ISD::FP_TO_SINT: return "fp_to_sint"; 5594 case ISD::FP_TO_UINT: return "fp_to_uint"; 5595 case ISD::BIT_CONVERT: return "bit_convert"; 5596 5597 case ISD::CONVERT_RNDSAT: { 5598 switch (cast<CvtRndSatSDNode>(this)->getCvtCode()) { 5599 default: assert(0 && "Unknown cvt code!"); 5600 case ISD::CVT_FF: return "cvt_ff"; 5601 case ISD::CVT_FS: return "cvt_fs"; 5602 case ISD::CVT_FU: return "cvt_fu"; 5603 case ISD::CVT_SF: return "cvt_sf"; 5604 case ISD::CVT_UF: return "cvt_uf"; 5605 case ISD::CVT_SS: return "cvt_ss"; 5606 case ISD::CVT_SU: return "cvt_su"; 5607 case ISD::CVT_US: return "cvt_us"; 5608 case ISD::CVT_UU: return "cvt_uu"; 5609 } 5610 } 5611 5612 // Control flow instructions 5613 case ISD::BR: return "br"; 5614 case ISD::BRIND: return "brind"; 5615 case ISD::BR_JT: return "br_jt"; 5616 case ISD::BRCOND: return "brcond"; 5617 case ISD::BR_CC: return "br_cc"; 5618 case ISD::RET: return "ret"; 5619 case ISD::CALLSEQ_START: return "callseq_start"; 5620 case ISD::CALLSEQ_END: return "callseq_end"; 5621 5622 // Other operators 5623 case ISD::LOAD: return "load"; 5624 case ISD::STORE: return "store"; 5625 case ISD::VAARG: return "vaarg"; 5626 case ISD::VACOPY: return "vacopy"; 5627 case ISD::VAEND: return "vaend"; 5628 case ISD::VASTART: return "vastart"; 5629 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 5630 case ISD::EXTRACT_ELEMENT: return "extract_element"; 5631 case ISD::BUILD_PAIR: return "build_pair"; 5632 case ISD::STACKSAVE: return "stacksave"; 5633 case ISD::STACKRESTORE: return "stackrestore"; 5634 case ISD::TRAP: return "trap"; 5635 5636 // Bit manipulation 5637 case ISD::BSWAP: return "bswap"; 5638 case ISD::CTPOP: return "ctpop"; 5639 case ISD::CTTZ: return "cttz"; 5640 case ISD::CTLZ: return "ctlz"; 5641 5642 // Debug info 5643 case ISD::DBG_STOPPOINT: return "dbg_stoppoint"; 5644 case ISD::DEBUG_LOC: return "debug_loc"; 5645 5646 // Trampolines 5647 case ISD::TRAMPOLINE: return "trampoline"; 5648 5649 case ISD::CONDCODE: 5650 switch (cast<CondCodeSDNode>(this)->get()) { 5651 default: assert(0 && "Unknown setcc condition!"); 5652 case ISD::SETOEQ: return "setoeq"; 5653 case ISD::SETOGT: return "setogt"; 5654 case ISD::SETOGE: return "setoge"; 5655 case ISD::SETOLT: return "setolt"; 5656 case ISD::SETOLE: return "setole"; 5657 case ISD::SETONE: return "setone"; 5658 5659 case ISD::SETO: return "seto"; 5660 case ISD::SETUO: return "setuo"; 5661 case ISD::SETUEQ: return "setue"; 5662 case ISD::SETUGT: return "setugt"; 5663 case ISD::SETUGE: return "setuge"; 5664 case ISD::SETULT: return "setult"; 5665 case ISD::SETULE: return "setule"; 5666 case ISD::SETUNE: return "setune"; 5667 5668 case ISD::SETEQ: return "seteq"; 5669 case ISD::SETGT: return "setgt"; 5670 case ISD::SETGE: return "setge"; 5671 case ISD::SETLT: return "setlt"; 5672 case ISD::SETLE: return "setle"; 5673 case ISD::SETNE: return "setne"; 5674 } 5675 } 5676} 5677 5678const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) { 5679 switch (AM) { 5680 default: 5681 return ""; 5682 case ISD::PRE_INC: 5683 return "<pre-inc>"; 5684 case ISD::PRE_DEC: 5685 return "<pre-dec>"; 5686 case ISD::POST_INC: 5687 return "<post-inc>"; 5688 case ISD::POST_DEC: 5689 return "<post-dec>"; 5690 } 5691} 5692 5693std::string ISD::ArgFlagsTy::getArgFlagsString() { 5694 std::string S = "< "; 5695 5696 if (isZExt()) 5697 S += "zext "; 5698 if (isSExt()) 5699 S += "sext "; 5700 if (isInReg()) 5701 S += "inreg "; 5702 if (isSRet()) 5703 S += "sret "; 5704 if (isByVal()) 5705 S += "byval "; 5706 if (isNest()) 5707 S += "nest "; 5708 if (getByValAlign()) 5709 S += "byval-align:" + utostr(getByValAlign()) + " "; 5710 if (getOrigAlign()) 5711 S += "orig-align:" + utostr(getOrigAlign()) + " "; 5712 if (getByValSize()) 5713 S += "byval-size:" + utostr(getByValSize()) + " "; 5714 return S + ">"; 5715} 5716 5717void SDNode::dump() const { dump(0); } 5718void SDNode::dump(const SelectionDAG *G) const { 5719 print(errs(), G); 5720 errs().flush(); 5721} 5722 5723void SDNode::print(raw_ostream &OS, const SelectionDAG *G) const { 5724 OS << (void*)this << ": "; 5725 5726 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 5727 if (i) OS << ","; 5728 if (getValueType(i) == MVT::Other) 5729 OS << "ch"; 5730 else 5731 OS << getValueType(i).getMVTString(); 5732 } 5733 OS << " = " << getOperationName(G); 5734 5735 OS << " "; 5736 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 5737 if (i) OS << ", "; 5738 OS << (void*)getOperand(i).getNode(); 5739 if (unsigned RN = getOperand(i).getResNo()) 5740 OS << ":" << RN; 5741 } 5742 5743 if (!isTargetOpcode() && getOpcode() == ISD::VECTOR_SHUFFLE) { 5744 SDNode *Mask = getOperand(2).getNode(); 5745 OS << "<"; 5746 for (unsigned i = 0, e = Mask->getNumOperands(); i != e; ++i) { 5747 if (i) OS << ","; 5748 if (Mask->getOperand(i).getOpcode() == ISD::UNDEF) 5749 OS << "u"; 5750 else 5751 OS << cast<ConstantSDNode>(Mask->getOperand(i))->getZExtValue(); 5752 } 5753 OS << ">"; 5754 } 5755 5756 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 5757 OS << '<' << CSDN->getAPIntValue() << '>'; 5758 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 5759 if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle) 5760 OS << '<' << CSDN->getValueAPF().convertToFloat() << '>'; 5761 else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble) 5762 OS << '<' << CSDN->getValueAPF().convertToDouble() << '>'; 5763 else { 5764 OS << "<APFloat("; 5765 CSDN->getValueAPF().bitcastToAPInt().dump(); 5766 OS << ")>"; 5767 } 5768 } else if (const GlobalAddressSDNode *GADN = 5769 dyn_cast<GlobalAddressSDNode>(this)) { 5770 int64_t offset = GADN->getOffset(); 5771 OS << '<'; 5772 WriteAsOperand(OS, GADN->getGlobal()); 5773 OS << '>'; 5774 if (offset > 0) 5775 OS << " + " << offset; 5776 else 5777 OS << " " << offset; 5778 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) { 5779 OS << "<" << FIDN->getIndex() << ">"; 5780 } else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) { 5781 OS << "<" << JTDN->getIndex() << ">"; 5782 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 5783 int offset = CP->getOffset(); 5784 if (CP->isMachineConstantPoolEntry()) 5785 OS << "<" << *CP->getMachineCPVal() << ">"; 5786 else 5787 OS << "<" << *CP->getConstVal() << ">"; 5788 if (offset > 0) 5789 OS << " + " << offset; 5790 else 5791 OS << " " << offset; 5792 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) { 5793 OS << "<"; 5794 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 5795 if (LBB) 5796 OS << LBB->getName() << " "; 5797 OS << (const void*)BBDN->getBasicBlock() << ">"; 5798 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) { 5799 if (G && R->getReg() && 5800 TargetRegisterInfo::isPhysicalRegister(R->getReg())) { 5801 OS << " " << G->getTarget().getRegisterInfo()->getName(R->getReg()); 5802 } else { 5803 OS << " #" << R->getReg(); 5804 } 5805 } else if (const ExternalSymbolSDNode *ES = 5806 dyn_cast<ExternalSymbolSDNode>(this)) { 5807 OS << "'" << ES->getSymbol() << "'"; 5808 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) { 5809 if (M->getValue()) 5810 OS << "<" << M->getValue() << ">"; 5811 else 5812 OS << "<null>"; 5813 } else if (const MemOperandSDNode *M = dyn_cast<MemOperandSDNode>(this)) { 5814 if (M->MO.getValue()) 5815 OS << "<" << M->MO.getValue() << ":" << M->MO.getOffset() << ">"; 5816 else 5817 OS << "<null:" << M->MO.getOffset() << ">"; 5818 } else if (const ARG_FLAGSSDNode *N = dyn_cast<ARG_FLAGSSDNode>(this)) { 5819 OS << N->getArgFlags().getArgFlagsString(); 5820 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) { 5821 OS << ":" << N->getVT().getMVTString(); 5822 } 5823 else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) { 5824 const Value *SrcValue = LD->getSrcValue(); 5825 int SrcOffset = LD->getSrcValueOffset(); 5826 OS << " <"; 5827 if (SrcValue) 5828 OS << SrcValue; 5829 else 5830 OS << "null"; 5831 OS << ":" << SrcOffset << ">"; 5832 5833 bool doExt = true; 5834 switch (LD->getExtensionType()) { 5835 default: doExt = false; break; 5836 case ISD::EXTLOAD: OS << " <anyext "; break; 5837 case ISD::SEXTLOAD: OS << " <sext "; break; 5838 case ISD::ZEXTLOAD: OS << " <zext "; break; 5839 } 5840 if (doExt) 5841 OS << LD->getMemoryVT().getMVTString() << ">"; 5842 5843 const char *AM = getIndexedModeName(LD->getAddressingMode()); 5844 if (*AM) 5845 OS << " " << AM; 5846 if (LD->isVolatile()) 5847 OS << " <volatile>"; 5848 OS << " alignment=" << LD->getAlignment(); 5849 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) { 5850 const Value *SrcValue = ST->getSrcValue(); 5851 int SrcOffset = ST->getSrcValueOffset(); 5852 OS << " <"; 5853 if (SrcValue) 5854 OS << SrcValue; 5855 else 5856 OS << "null"; 5857 OS << ":" << SrcOffset << ">"; 5858 5859 if (ST->isTruncatingStore()) 5860 OS << " <trunc " << ST->getMemoryVT().getMVTString() << ">"; 5861 5862 const char *AM = getIndexedModeName(ST->getAddressingMode()); 5863 if (*AM) 5864 OS << " " << AM; 5865 if (ST->isVolatile()) 5866 OS << " <volatile>"; 5867 OS << " alignment=" << ST->getAlignment(); 5868 } else if (const AtomicSDNode* AT = dyn_cast<AtomicSDNode>(this)) { 5869 const Value *SrcValue = AT->getSrcValue(); 5870 int SrcOffset = AT->getSrcValueOffset(); 5871 OS << " <"; 5872 if (SrcValue) 5873 OS << SrcValue; 5874 else 5875 OS << "null"; 5876 OS << ":" << SrcOffset << ">"; 5877 if (AT->isVolatile()) 5878 OS << " <volatile>"; 5879 OS << " alignment=" << AT->getAlignment(); 5880 } 5881} 5882 5883static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) { 5884 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 5885 if (N->getOperand(i).getNode()->hasOneUse()) 5886 DumpNodes(N->getOperand(i).getNode(), indent+2, G); 5887 else 5888 cerr << "\n" << std::string(indent+2, ' ') 5889 << (void*)N->getOperand(i).getNode() << ": <multiple use>"; 5890 5891 5892 cerr << "\n" << std::string(indent, ' '); 5893 N->dump(G); 5894} 5895 5896void SelectionDAG::dump() const { 5897 cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 5898 5899 for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end(); 5900 I != E; ++I) { 5901 const SDNode *N = I; 5902 if (!N->hasOneUse() && N != getRoot().getNode()) 5903 DumpNodes(N, 2, this); 5904 } 5905 5906 if (getRoot().getNode()) DumpNodes(getRoot().getNode(), 2, this); 5907 5908 cerr << "\n\n"; 5909} 5910 5911const Type *ConstantPoolSDNode::getType() const { 5912 if (isMachineConstantPoolEntry()) 5913 return Val.MachineCPVal->getType(); 5914 return Val.ConstVal->getType(); 5915} 5916