SelectionDAG.cpp revision 35ef913ec21de0f4f1b39c811b4335438717a9b8
1//===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This implements the SelectionDAG class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/CodeGen/SelectionDAG.h" 15#include "llvm/Constants.h" 16#include "llvm/GlobalValue.h" 17#include "llvm/Assembly/Writer.h" 18#include "llvm/CodeGen/MachineBasicBlock.h" 19#include "llvm/Support/MathExtras.h" 20#include "llvm/Target/MRegisterInfo.h" 21#include "llvm/Target/TargetLowering.h" 22#include "llvm/Target/TargetInstrInfo.h" 23#include "llvm/Target/TargetMachine.h" 24#include "llvm/ADT/StringExtras.h" 25#include <iostream> 26#include <set> 27#include <cmath> 28#include <algorithm> 29using namespace llvm; 30 31static bool isCommutativeBinOp(unsigned Opcode) { 32 switch (Opcode) { 33 case ISD::ADD: 34 case ISD::MUL: 35 case ISD::FADD: 36 case ISD::FMUL: 37 case ISD::AND: 38 case ISD::OR: 39 case ISD::XOR: return true; 40 default: return false; // FIXME: Need commutative info for user ops! 41 } 42} 43 44static bool isAssociativeBinOp(unsigned Opcode) { 45 switch (Opcode) { 46 case ISD::ADD: 47 case ISD::MUL: 48 case ISD::AND: 49 case ISD::OR: 50 case ISD::XOR: return true; 51 default: return false; // FIXME: Need associative info for user ops! 52 } 53} 54 55// isInvertibleForFree - Return true if there is no cost to emitting the logical 56// inverse of this node. 57static bool isInvertibleForFree(SDOperand N) { 58 if (isa<ConstantSDNode>(N.Val)) return true; 59 if (N.Val->getOpcode() == ISD::SETCC && N.Val->hasOneUse()) 60 return true; 61 return false; 62} 63 64//===----------------------------------------------------------------------===// 65// ConstantFPSDNode Class 66//===----------------------------------------------------------------------===// 67 68/// isExactlyValue - We don't rely on operator== working on double values, as 69/// it returns true for things that are clearly not equal, like -0.0 and 0.0. 70/// As such, this method can be used to do an exact bit-for-bit comparison of 71/// two floating point values. 72bool ConstantFPSDNode::isExactlyValue(double V) const { 73 return DoubleToBits(V) == DoubleToBits(Value); 74} 75 76//===----------------------------------------------------------------------===// 77// ISD Class 78//===----------------------------------------------------------------------===// 79 80/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 81/// when given the operation for (X op Y). 82ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) { 83 // To perform this operation, we just need to swap the L and G bits of the 84 // operation. 85 unsigned OldL = (Operation >> 2) & 1; 86 unsigned OldG = (Operation >> 1) & 1; 87 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits 88 (OldL << 1) | // New G bit 89 (OldG << 2)); // New L bit. 90} 91 92/// getSetCCInverse - Return the operation corresponding to !(X op Y), where 93/// 'op' is a valid SetCC operation. 94ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) { 95 unsigned Operation = Op; 96 if (isInteger) 97 Operation ^= 7; // Flip L, G, E bits, but not U. 98 else 99 Operation ^= 15; // Flip all of the condition bits. 100 if (Operation > ISD::SETTRUE2) 101 Operation &= ~8; // Don't let N and U bits get set. 102 return ISD::CondCode(Operation); 103} 104 105 106/// isSignedOp - For an integer comparison, return 1 if the comparison is a 107/// signed operation and 2 if the result is an unsigned comparison. Return zero 108/// if the operation does not depend on the sign of the input (setne and seteq). 109static int isSignedOp(ISD::CondCode Opcode) { 110 switch (Opcode) { 111 default: assert(0 && "Illegal integer setcc operation!"); 112 case ISD::SETEQ: 113 case ISD::SETNE: return 0; 114 case ISD::SETLT: 115 case ISD::SETLE: 116 case ISD::SETGT: 117 case ISD::SETGE: return 1; 118 case ISD::SETULT: 119 case ISD::SETULE: 120 case ISD::SETUGT: 121 case ISD::SETUGE: return 2; 122 } 123} 124 125/// getSetCCOrOperation - Return the result of a logical OR between different 126/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function 127/// returns SETCC_INVALID if it is not possible to represent the resultant 128/// comparison. 129ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2, 130 bool isInteger) { 131 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 132 // Cannot fold a signed integer setcc with an unsigned integer setcc. 133 return ISD::SETCC_INVALID; 134 135 unsigned Op = Op1 | Op2; // Combine all of the condition bits. 136 137 // If the N and U bits get set then the resultant comparison DOES suddenly 138 // care about orderedness, and is true when ordered. 139 if (Op > ISD::SETTRUE2) 140 Op &= ~16; // Clear the N bit. 141 return ISD::CondCode(Op); 142} 143 144/// getSetCCAndOperation - Return the result of a logical AND between different 145/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 146/// function returns zero if it is not possible to represent the resultant 147/// comparison. 148ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2, 149 bool isInteger) { 150 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 151 // Cannot fold a signed setcc with an unsigned setcc. 152 return ISD::SETCC_INVALID; 153 154 // Combine all of the condition bits. 155 return ISD::CondCode(Op1 & Op2); 156} 157 158const TargetMachine &SelectionDAG::getTarget() const { 159 return TLI.getTargetMachine(); 160} 161 162//===----------------------------------------------------------------------===// 163// SelectionDAG Class 164//===----------------------------------------------------------------------===// 165 166/// RemoveDeadNodes - This method deletes all unreachable nodes in the 167/// SelectionDAG, including nodes (like loads) that have uses of their token 168/// chain but no other uses and no side effect. If a node is passed in as an 169/// argument, it is used as the seed for node deletion. 170void SelectionDAG::RemoveDeadNodes(SDNode *N) { 171 // Create a dummy node (which is not added to allnodes), that adds a reference 172 // to the root node, preventing it from being deleted. 173 HandleSDNode Dummy(getRoot()); 174 175 bool MadeChange = false; 176 177 // If we have a hint to start from, use it. 178 if (N && N->use_empty()) { 179 DestroyDeadNode(N); 180 MadeChange = true; 181 } 182 183 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I) 184 if (I->use_empty() && I->getOpcode() != 65535) { 185 // Node is dead, recursively delete newly dead uses. 186 DestroyDeadNode(I); 187 MadeChange = true; 188 } 189 190 // Walk the nodes list, removing the nodes we've marked as dead. 191 if (MadeChange) { 192 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ) { 193 SDNode *N = I++; 194 if (N->use_empty()) 195 AllNodes.erase(N); 196 } 197 } 198 199 // If the root changed (e.g. it was a dead load, update the root). 200 setRoot(Dummy.getValue()); 201} 202 203/// DestroyDeadNode - We know that N is dead. Nuke it from the CSE maps for the 204/// graph. If it is the last user of any of its operands, recursively process 205/// them the same way. 206/// 207void SelectionDAG::DestroyDeadNode(SDNode *N) { 208 // Okay, we really are going to delete this node. First take this out of the 209 // appropriate CSE map. 210 RemoveNodeFromCSEMaps(N); 211 212 // Next, brutally remove the operand list. This is safe to do, as there are 213 // no cycles in the graph. 214 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) { 215 SDNode *O = I->Val; 216 O->removeUser(N); 217 218 // Now that we removed this operand, see if there are no uses of it left. 219 if (O->use_empty()) 220 DestroyDeadNode(O); 221 } 222 delete[] N->OperandList; 223 N->OperandList = 0; 224 N->NumOperands = 0; 225 226 // Mark the node as dead. 227 N->MorphNodeTo(65535); 228} 229 230void SelectionDAG::DeleteNode(SDNode *N) { 231 assert(N->use_empty() && "Cannot delete a node that is not dead!"); 232 233 // First take this out of the appropriate CSE map. 234 RemoveNodeFromCSEMaps(N); 235 236 // Finally, remove uses due to operands of this node, remove from the 237 // AllNodes list, and delete the node. 238 DeleteNodeNotInCSEMaps(N); 239} 240 241void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) { 242 243 // Remove it from the AllNodes list. 244 AllNodes.remove(N); 245 246 // Drop all of the operands and decrement used nodes use counts. 247 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) 248 I->Val->removeUser(N); 249 delete[] N->OperandList; 250 N->OperandList = 0; 251 N->NumOperands = 0; 252 253 delete N; 254} 255 256/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that 257/// correspond to it. This is useful when we're about to delete or repurpose 258/// the node. We don't want future request for structurally identical nodes 259/// to return N anymore. 260void SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) { 261 bool Erased = false; 262 switch (N->getOpcode()) { 263 case ISD::HANDLENODE: return; // noop. 264 case ISD::Constant: 265 Erased = Constants.erase(std::make_pair(cast<ConstantSDNode>(N)->getValue(), 266 N->getValueType(0))); 267 break; 268 case ISD::TargetConstant: 269 Erased = TargetConstants.erase(std::make_pair( 270 cast<ConstantSDNode>(N)->getValue(), 271 N->getValueType(0))); 272 break; 273 case ISD::ConstantFP: { 274 uint64_t V = DoubleToBits(cast<ConstantFPSDNode>(N)->getValue()); 275 Erased = ConstantFPs.erase(std::make_pair(V, N->getValueType(0))); 276 break; 277 } 278 case ISD::STRING: 279 Erased = StringNodes.erase(cast<StringSDNode>(N)->getValue()); 280 break; 281 case ISD::CONDCODE: 282 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] && 283 "Cond code doesn't exist!"); 284 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0; 285 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0; 286 break; 287 case ISD::GlobalAddress: { 288 GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(N); 289 Erased = GlobalValues.erase(std::make_pair(GN->getGlobal(), 290 GN->getOffset())); 291 break; 292 } 293 case ISD::TargetGlobalAddress: { 294 GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(N); 295 Erased =TargetGlobalValues.erase(std::make_pair(GN->getGlobal(), 296 GN->getOffset())); 297 break; 298 } 299 case ISD::FrameIndex: 300 Erased = FrameIndices.erase(cast<FrameIndexSDNode>(N)->getIndex()); 301 break; 302 case ISD::TargetFrameIndex: 303 Erased = TargetFrameIndices.erase(cast<FrameIndexSDNode>(N)->getIndex()); 304 break; 305 case ISD::ConstantPool: 306 Erased = ConstantPoolIndices.erase(cast<ConstantPoolSDNode>(N)->get()); 307 break; 308 case ISD::TargetConstantPool: 309 Erased =TargetConstantPoolIndices.erase(cast<ConstantPoolSDNode>(N)->get()); 310 break; 311 case ISD::BasicBlock: 312 Erased = BBNodes.erase(cast<BasicBlockSDNode>(N)->getBasicBlock()); 313 break; 314 case ISD::ExternalSymbol: 315 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 316 break; 317 case ISD::TargetExternalSymbol: 318 Erased = TargetExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 319 break; 320 case ISD::VALUETYPE: 321 Erased = ValueTypeNodes[cast<VTSDNode>(N)->getVT()] != 0; 322 ValueTypeNodes[cast<VTSDNode>(N)->getVT()] = 0; 323 break; 324 case ISD::Register: 325 Erased = RegNodes.erase(std::make_pair(cast<RegisterSDNode>(N)->getReg(), 326 N->getValueType(0))); 327 break; 328 case ISD::SRCVALUE: { 329 SrcValueSDNode *SVN = cast<SrcValueSDNode>(N); 330 Erased =ValueNodes.erase(std::make_pair(SVN->getValue(), SVN->getOffset())); 331 break; 332 } 333 case ISD::LOAD: 334 Erased = Loads.erase(std::make_pair(N->getOperand(1), 335 std::make_pair(N->getOperand(0), 336 N->getValueType(0)))); 337 break; 338 default: 339 if (N->getNumValues() == 1) { 340 if (N->getNumOperands() == 0) { 341 Erased = NullaryOps.erase(std::make_pair(N->getOpcode(), 342 N->getValueType(0))); 343 } else if (N->getNumOperands() == 1) { 344 Erased = 345 UnaryOps.erase(std::make_pair(N->getOpcode(), 346 std::make_pair(N->getOperand(0), 347 N->getValueType(0)))); 348 } else if (N->getNumOperands() == 2) { 349 Erased = 350 BinaryOps.erase(std::make_pair(N->getOpcode(), 351 std::make_pair(N->getOperand(0), 352 N->getOperand(1)))); 353 } else { 354 std::vector<SDOperand> Ops(N->op_begin(), N->op_end()); 355 Erased = 356 OneResultNodes.erase(std::make_pair(N->getOpcode(), 357 std::make_pair(N->getValueType(0), 358 Ops))); 359 } 360 } else { 361 // Remove the node from the ArbitraryNodes map. 362 std::vector<MVT::ValueType> RV(N->value_begin(), N->value_end()); 363 std::vector<SDOperand> Ops(N->op_begin(), N->op_end()); 364 Erased = 365 ArbitraryNodes.erase(std::make_pair(N->getOpcode(), 366 std::make_pair(RV, Ops))); 367 } 368 break; 369 } 370#ifndef NDEBUG 371 // Verify that the node was actually in one of the CSE maps, unless it has a 372 // flag result (which cannot be CSE'd) or is one of the special cases that are 373 // not subject to CSE. 374 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag && 375 N->getOpcode() != ISD::CALL && N->getOpcode() != ISD::CALLSEQ_START && 376 N->getOpcode() != ISD::CALLSEQ_END && !N->isTargetOpcode()) { 377 378 N->dump(); 379 assert(0 && "Node is not in map!"); 380 } 381#endif 382} 383 384/// AddNonLeafNodeToCSEMaps - Add the specified node back to the CSE maps. It 385/// has been taken out and modified in some way. If the specified node already 386/// exists in the CSE maps, do not modify the maps, but return the existing node 387/// instead. If it doesn't exist, add it and return null. 388/// 389SDNode *SelectionDAG::AddNonLeafNodeToCSEMaps(SDNode *N) { 390 assert(N->getNumOperands() && "This is a leaf node!"); 391 if (N->getOpcode() == ISD::CALLSEQ_START || 392 N->getOpcode() == ISD::CALLSEQ_END || 393 N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag) 394 return 0; // Never add these nodes. 395 396 // Check that remaining values produced are not flags. 397 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i) 398 if (N->getValueType(i) == MVT::Flag) 399 return 0; // Never CSE anything that produces a flag. 400 401 if (N->getNumValues() == 1) { 402 if (N->getNumOperands() == 1) { 403 SDNode *&U = UnaryOps[std::make_pair(N->getOpcode(), 404 std::make_pair(N->getOperand(0), 405 N->getValueType(0)))]; 406 if (U) return U; 407 U = N; 408 } else if (N->getNumOperands() == 2) { 409 SDNode *&B = BinaryOps[std::make_pair(N->getOpcode(), 410 std::make_pair(N->getOperand(0), 411 N->getOperand(1)))]; 412 if (B) return B; 413 B = N; 414 } else { 415 std::vector<SDOperand> Ops(N->op_begin(), N->op_end()); 416 SDNode *&ORN = OneResultNodes[std::make_pair(N->getOpcode(), 417 std::make_pair(N->getValueType(0), Ops))]; 418 if (ORN) return ORN; 419 ORN = N; 420 } 421 } else { 422 if (N->getOpcode() == ISD::LOAD) { 423 SDNode *&L = Loads[std::make_pair(N->getOperand(1), 424 std::make_pair(N->getOperand(0), 425 N->getValueType(0)))]; 426 if (L) return L; 427 L = N; 428 } else { 429 // Remove the node from the ArbitraryNodes map. 430 std::vector<MVT::ValueType> RV(N->value_begin(), N->value_end()); 431 std::vector<SDOperand> Ops(N->op_begin(), N->op_end()); 432 SDNode *&AN = ArbitraryNodes[std::make_pair(N->getOpcode(), 433 std::make_pair(RV, Ops))]; 434 if (AN) return AN; 435 AN = N; 436 } 437 } 438 return 0; 439} 440 441 442 443SelectionDAG::~SelectionDAG() { 444 while (!AllNodes.empty()) { 445 SDNode *N = AllNodes.begin(); 446 delete [] N->OperandList; 447 N->OperandList = 0; 448 N->NumOperands = 0; 449 AllNodes.pop_front(); 450 } 451} 452 453SDOperand SelectionDAG::getZeroExtendInReg(SDOperand Op, MVT::ValueType VT) { 454 if (Op.getValueType() == VT) return Op; 455 int64_t Imm = ~0ULL >> (64-MVT::getSizeInBits(VT)); 456 return getNode(ISD::AND, Op.getValueType(), Op, 457 getConstant(Imm, Op.getValueType())); 458} 459 460SDOperand SelectionDAG::getConstant(uint64_t Val, MVT::ValueType VT) { 461 assert(MVT::isInteger(VT) && "Cannot create FP integer constant!"); 462 // Mask out any bits that are not valid for this constant. 463 if (VT != MVT::i64) 464 Val &= ((uint64_t)1 << MVT::getSizeInBits(VT)) - 1; 465 466 SDNode *&N = Constants[std::make_pair(Val, VT)]; 467 if (N) return SDOperand(N, 0); 468 N = new ConstantSDNode(false, Val, VT); 469 AllNodes.push_back(N); 470 return SDOperand(N, 0); 471} 472 473SDOperand SelectionDAG::getString(const std::string &Val) { 474 StringSDNode *&N = StringNodes[Val]; 475 if (!N) { 476 N = new StringSDNode(Val); 477 AllNodes.push_back(N); 478 } 479 return SDOperand(N, 0); 480} 481 482SDOperand SelectionDAG::getTargetConstant(uint64_t Val, MVT::ValueType VT) { 483 assert(MVT::isInteger(VT) && "Cannot create FP integer constant!"); 484 // Mask out any bits that are not valid for this constant. 485 if (VT != MVT::i64) 486 Val &= ((uint64_t)1 << MVT::getSizeInBits(VT)) - 1; 487 488 SDNode *&N = TargetConstants[std::make_pair(Val, VT)]; 489 if (N) return SDOperand(N, 0); 490 N = new ConstantSDNode(true, Val, VT); 491 AllNodes.push_back(N); 492 return SDOperand(N, 0); 493} 494 495SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) { 496 assert(MVT::isFloatingPoint(VT) && "Cannot create integer FP constant!"); 497 if (VT == MVT::f32) 498 Val = (float)Val; // Mask out extra precision. 499 500 // Do the map lookup using the actual bit pattern for the floating point 501 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and 502 // we don't have issues with SNANs. 503 SDNode *&N = ConstantFPs[std::make_pair(DoubleToBits(Val), VT)]; 504 if (N) return SDOperand(N, 0); 505 N = new ConstantFPSDNode(Val, VT); 506 AllNodes.push_back(N); 507 return SDOperand(N, 0); 508} 509 510SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV, 511 MVT::ValueType VT, int offset) { 512 SDNode *&N = GlobalValues[std::make_pair(GV, offset)]; 513 if (N) return SDOperand(N, 0); 514 N = new GlobalAddressSDNode(false, GV, VT, offset); 515 AllNodes.push_back(N); 516 return SDOperand(N, 0); 517} 518 519SDOperand SelectionDAG::getTargetGlobalAddress(const GlobalValue *GV, 520 MVT::ValueType VT, int offset) { 521 SDNode *&N = TargetGlobalValues[std::make_pair(GV, offset)]; 522 if (N) return SDOperand(N, 0); 523 N = new GlobalAddressSDNode(true, GV, VT, offset); 524 AllNodes.push_back(N); 525 return SDOperand(N, 0); 526} 527 528SDOperand SelectionDAG::getFrameIndex(int FI, MVT::ValueType VT) { 529 SDNode *&N = FrameIndices[FI]; 530 if (N) return SDOperand(N, 0); 531 N = new FrameIndexSDNode(FI, VT, false); 532 AllNodes.push_back(N); 533 return SDOperand(N, 0); 534} 535 536SDOperand SelectionDAG::getTargetFrameIndex(int FI, MVT::ValueType VT) { 537 SDNode *&N = TargetFrameIndices[FI]; 538 if (N) return SDOperand(N, 0); 539 N = new FrameIndexSDNode(FI, VT, true); 540 AllNodes.push_back(N); 541 return SDOperand(N, 0); 542} 543 544SDOperand SelectionDAG::getConstantPool(Constant *C, MVT::ValueType VT) { 545 SDNode *&N = ConstantPoolIndices[C]; 546 if (N) return SDOperand(N, 0); 547 N = new ConstantPoolSDNode(C, VT, false); 548 AllNodes.push_back(N); 549 return SDOperand(N, 0); 550} 551 552SDOperand SelectionDAG::getTargetConstantPool(Constant *C, MVT::ValueType VT) { 553 SDNode *&N = TargetConstantPoolIndices[C]; 554 if (N) return SDOperand(N, 0); 555 N = new ConstantPoolSDNode(C, VT, true); 556 AllNodes.push_back(N); 557 return SDOperand(N, 0); 558} 559 560SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 561 SDNode *&N = BBNodes[MBB]; 562 if (N) return SDOperand(N, 0); 563 N = new BasicBlockSDNode(MBB); 564 AllNodes.push_back(N); 565 return SDOperand(N, 0); 566} 567 568SDOperand SelectionDAG::getValueType(MVT::ValueType VT) { 569 if ((unsigned)VT >= ValueTypeNodes.size()) 570 ValueTypeNodes.resize(VT+1); 571 if (ValueTypeNodes[VT] == 0) { 572 ValueTypeNodes[VT] = new VTSDNode(VT); 573 AllNodes.push_back(ValueTypeNodes[VT]); 574 } 575 576 return SDOperand(ValueTypeNodes[VT], 0); 577} 578 579SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT::ValueType VT) { 580 SDNode *&N = ExternalSymbols[Sym]; 581 if (N) return SDOperand(N, 0); 582 N = new ExternalSymbolSDNode(false, Sym, VT); 583 AllNodes.push_back(N); 584 return SDOperand(N, 0); 585} 586 587SDOperand SelectionDAG::getTargetExternalSymbol(const char *Sym, MVT::ValueType VT) { 588 SDNode *&N = TargetExternalSymbols[Sym]; 589 if (N) return SDOperand(N, 0); 590 N = new ExternalSymbolSDNode(true, Sym, VT); 591 AllNodes.push_back(N); 592 return SDOperand(N, 0); 593} 594 595SDOperand SelectionDAG::getCondCode(ISD::CondCode Cond) { 596 if ((unsigned)Cond >= CondCodeNodes.size()) 597 CondCodeNodes.resize(Cond+1); 598 599 if (CondCodeNodes[Cond] == 0) { 600 CondCodeNodes[Cond] = new CondCodeSDNode(Cond); 601 AllNodes.push_back(CondCodeNodes[Cond]); 602 } 603 return SDOperand(CondCodeNodes[Cond], 0); 604} 605 606SDOperand SelectionDAG::getRegister(unsigned RegNo, MVT::ValueType VT) { 607 RegisterSDNode *&Reg = RegNodes[std::make_pair(RegNo, VT)]; 608 if (!Reg) { 609 Reg = new RegisterSDNode(RegNo, VT); 610 AllNodes.push_back(Reg); 611 } 612 return SDOperand(Reg, 0); 613} 614 615SDOperand SelectionDAG::SimplifySetCC(MVT::ValueType VT, SDOperand N1, 616 SDOperand N2, ISD::CondCode Cond) { 617 // These setcc operations always fold. 618 switch (Cond) { 619 default: break; 620 case ISD::SETFALSE: 621 case ISD::SETFALSE2: return getConstant(0, VT); 622 case ISD::SETTRUE: 623 case ISD::SETTRUE2: return getConstant(1, VT); 624 } 625 626 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) { 627 uint64_t C2 = N2C->getValue(); 628 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) { 629 uint64_t C1 = N1C->getValue(); 630 631 // Sign extend the operands if required 632 if (ISD::isSignedIntSetCC(Cond)) { 633 C1 = N1C->getSignExtended(); 634 C2 = N2C->getSignExtended(); 635 } 636 637 switch (Cond) { 638 default: assert(0 && "Unknown integer setcc!"); 639 case ISD::SETEQ: return getConstant(C1 == C2, VT); 640 case ISD::SETNE: return getConstant(C1 != C2, VT); 641 case ISD::SETULT: return getConstant(C1 < C2, VT); 642 case ISD::SETUGT: return getConstant(C1 > C2, VT); 643 case ISD::SETULE: return getConstant(C1 <= C2, VT); 644 case ISD::SETUGE: return getConstant(C1 >= C2, VT); 645 case ISD::SETLT: return getConstant((int64_t)C1 < (int64_t)C2, VT); 646 case ISD::SETGT: return getConstant((int64_t)C1 > (int64_t)C2, VT); 647 case ISD::SETLE: return getConstant((int64_t)C1 <= (int64_t)C2, VT); 648 case ISD::SETGE: return getConstant((int64_t)C1 >= (int64_t)C2, VT); 649 } 650 } else { 651 // If the LHS is a ZERO_EXTEND, perform the comparison on the input. 652 if (N1.getOpcode() == ISD::ZERO_EXTEND) { 653 unsigned InSize = MVT::getSizeInBits(N1.getOperand(0).getValueType()); 654 655 // If the comparison constant has bits in the upper part, the 656 // zero-extended value could never match. 657 if (C2 & (~0ULL << InSize)) { 658 unsigned VSize = MVT::getSizeInBits(N1.getValueType()); 659 switch (Cond) { 660 case ISD::SETUGT: 661 case ISD::SETUGE: 662 case ISD::SETEQ: return getConstant(0, VT); 663 case ISD::SETULT: 664 case ISD::SETULE: 665 case ISD::SETNE: return getConstant(1, VT); 666 case ISD::SETGT: 667 case ISD::SETGE: 668 // True if the sign bit of C2 is set. 669 return getConstant((C2 & (1ULL << VSize)) != 0, VT); 670 case ISD::SETLT: 671 case ISD::SETLE: 672 // True if the sign bit of C2 isn't set. 673 return getConstant((C2 & (1ULL << VSize)) == 0, VT); 674 default: 675 break; 676 } 677 } 678 679 // Otherwise, we can perform the comparison with the low bits. 680 switch (Cond) { 681 case ISD::SETEQ: 682 case ISD::SETNE: 683 case ISD::SETUGT: 684 case ISD::SETUGE: 685 case ISD::SETULT: 686 case ISD::SETULE: 687 return getSetCC(VT, N1.getOperand(0), 688 getConstant(C2, N1.getOperand(0).getValueType()), 689 Cond); 690 default: 691 break; // todo, be more careful with signed comparisons 692 } 693 } else if (N1.getOpcode() == ISD::SIGN_EXTEND_INREG && 694 (Cond == ISD::SETEQ || Cond == ISD::SETNE)) { 695 MVT::ValueType ExtSrcTy = cast<VTSDNode>(N1.getOperand(1))->getVT(); 696 unsigned ExtSrcTyBits = MVT::getSizeInBits(ExtSrcTy); 697 MVT::ValueType ExtDstTy = N1.getValueType(); 698 unsigned ExtDstTyBits = MVT::getSizeInBits(ExtDstTy); 699 700 // If the extended part has any inconsistent bits, it cannot ever 701 // compare equal. In other words, they have to be all ones or all 702 // zeros. 703 uint64_t ExtBits = 704 (~0ULL >> (64-ExtSrcTyBits)) & (~0ULL << (ExtDstTyBits-1)); 705 if ((C2 & ExtBits) != 0 && (C2 & ExtBits) != ExtBits) 706 return getConstant(Cond == ISD::SETNE, VT); 707 708 // Otherwise, make this a use of a zext. 709 return getSetCC(VT, getZeroExtendInReg(N1.getOperand(0), ExtSrcTy), 710 getConstant(C2 & (~0ULL>>(64-ExtSrcTyBits)), ExtDstTy), 711 Cond); 712 } 713 714 uint64_t MinVal, MaxVal; 715 unsigned OperandBitSize = MVT::getSizeInBits(N2C->getValueType(0)); 716 if (ISD::isSignedIntSetCC(Cond)) { 717 MinVal = 1ULL << (OperandBitSize-1); 718 if (OperandBitSize != 1) // Avoid X >> 64, which is undefined. 719 MaxVal = ~0ULL >> (65-OperandBitSize); 720 else 721 MaxVal = 0; 722 } else { 723 MinVal = 0; 724 MaxVal = ~0ULL >> (64-OperandBitSize); 725 } 726 727 // Canonicalize GE/LE comparisons to use GT/LT comparisons. 728 if (Cond == ISD::SETGE || Cond == ISD::SETUGE) { 729 if (C2 == MinVal) return getConstant(1, VT); // X >= MIN --> true 730 --C2; // X >= C1 --> X > (C1-1) 731 return getSetCC(VT, N1, getConstant(C2, N2.getValueType()), 732 (Cond == ISD::SETGE) ? ISD::SETGT : ISD::SETUGT); 733 } 734 735 if (Cond == ISD::SETLE || Cond == ISD::SETULE) { 736 if (C2 == MaxVal) return getConstant(1, VT); // X <= MAX --> true 737 ++C2; // X <= C1 --> X < (C1+1) 738 return getSetCC(VT, N1, getConstant(C2, N2.getValueType()), 739 (Cond == ISD::SETLE) ? ISD::SETLT : ISD::SETULT); 740 } 741 742 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal) 743 return getConstant(0, VT); // X < MIN --> false 744 745 // Canonicalize setgt X, Min --> setne X, Min 746 if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MinVal) 747 return getSetCC(VT, N1, N2, ISD::SETNE); 748 749 // If we have setult X, 1, turn it into seteq X, 0 750 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal+1) 751 return getSetCC(VT, N1, getConstant(MinVal, N1.getValueType()), 752 ISD::SETEQ); 753 // If we have setugt X, Max-1, turn it into seteq X, Max 754 else if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MaxVal-1) 755 return getSetCC(VT, N1, getConstant(MaxVal, N1.getValueType()), 756 ISD::SETEQ); 757 758 // If we have "setcc X, C1", check to see if we can shrink the immediate 759 // by changing cc. 760 761 // SETUGT X, SINTMAX -> SETLT X, 0 762 if (Cond == ISD::SETUGT && OperandBitSize != 1 && 763 C2 == (~0ULL >> (65-OperandBitSize))) 764 return getSetCC(VT, N1, getConstant(0, N2.getValueType()), ISD::SETLT); 765 766 // FIXME: Implement the rest of these. 767 768 769 // Fold bit comparisons when we can. 770 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) && 771 VT == N1.getValueType() && N1.getOpcode() == ISD::AND) 772 if (ConstantSDNode *AndRHS = 773 dyn_cast<ConstantSDNode>(N1.getOperand(1))) { 774 if (Cond == ISD::SETNE && C2 == 0) {// (X & 8) != 0 --> (X & 8) >> 3 775 // Perform the xform if the AND RHS is a single bit. 776 if ((AndRHS->getValue() & (AndRHS->getValue()-1)) == 0) { 777 return getNode(ISD::SRL, VT, N1, 778 getConstant(Log2_64(AndRHS->getValue()), 779 TLI.getShiftAmountTy())); 780 } 781 } else if (Cond == ISD::SETEQ && C2 == AndRHS->getValue()) { 782 // (X & 8) == 8 --> (X & 8) >> 3 783 // Perform the xform if C2 is a single bit. 784 if ((C2 & (C2-1)) == 0) { 785 return getNode(ISD::SRL, VT, N1, 786 getConstant(Log2_64(C2),TLI.getShiftAmountTy())); 787 } 788 } 789 } 790 } 791 } else if (isa<ConstantSDNode>(N1.Val)) { 792 // Ensure that the constant occurs on the RHS. 793 return getSetCC(VT, N2, N1, ISD::getSetCCSwappedOperands(Cond)); 794 } 795 796 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) 797 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) { 798 double C1 = N1C->getValue(), C2 = N2C->getValue(); 799 800 switch (Cond) { 801 default: break; // FIXME: Implement the rest of these! 802 case ISD::SETEQ: return getConstant(C1 == C2, VT); 803 case ISD::SETNE: return getConstant(C1 != C2, VT); 804 case ISD::SETLT: return getConstant(C1 < C2, VT); 805 case ISD::SETGT: return getConstant(C1 > C2, VT); 806 case ISD::SETLE: return getConstant(C1 <= C2, VT); 807 case ISD::SETGE: return getConstant(C1 >= C2, VT); 808 } 809 } else { 810 // Ensure that the constant occurs on the RHS. 811 return getSetCC(VT, N2, N1, ISD::getSetCCSwappedOperands(Cond)); 812 } 813 814 // Could not fold it. 815 return SDOperand(); 816} 817 818/// getNode - Gets or creates the specified node. 819/// 820SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT) { 821 SDNode *&N = NullaryOps[std::make_pair(Opcode, VT)]; 822 if (!N) { 823 N = new SDNode(Opcode, VT); 824 AllNodes.push_back(N); 825 } 826 return SDOperand(N, 0); 827} 828 829SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 830 SDOperand Operand) { 831 // Constant fold unary operations with an integer constant operand. 832 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) { 833 uint64_t Val = C->getValue(); 834 switch (Opcode) { 835 default: break; 836 case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT); 837 case ISD::ANY_EXTEND: 838 case ISD::ZERO_EXTEND: return getConstant(Val, VT); 839 case ISD::TRUNCATE: return getConstant(Val, VT); 840 case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT); 841 case ISD::UINT_TO_FP: return getConstantFP(C->getValue(), VT); 842 case ISD::BIT_CONVERT: 843 if (VT == MVT::f32) { 844 assert(C->getValueType(0) == MVT::i32 && "Invalid bit_convert!"); 845 return getConstantFP(BitsToFloat(Val), VT); 846 } else if (VT == MVT::f64) { 847 assert(C->getValueType(0) == MVT::i64 && "Invalid bit_convert!"); 848 return getConstantFP(BitsToDouble(Val), VT); 849 } 850 break; 851 } 852 } 853 854 // Constant fold unary operations with an floating point constant operand. 855 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) 856 switch (Opcode) { 857 case ISD::FNEG: 858 return getConstantFP(-C->getValue(), VT); 859 case ISD::FABS: 860 return getConstantFP(fabs(C->getValue()), VT); 861 case ISD::FP_ROUND: 862 case ISD::FP_EXTEND: 863 return getConstantFP(C->getValue(), VT); 864 case ISD::FP_TO_SINT: 865 return getConstant((int64_t)C->getValue(), VT); 866 case ISD::FP_TO_UINT: 867 return getConstant((uint64_t)C->getValue(), VT); 868 case ISD::BIT_CONVERT: 869 if (VT == MVT::i32) { 870 assert(C->getValueType(0) == MVT::f32 && "Invalid bit_convert!"); 871 return getConstant(FloatToBits(C->getValue()), VT); 872 } else if (VT == MVT::i64) { 873 assert(C->getValueType(0) == MVT::f64 && "Invalid bit_convert!"); 874 return getConstant(DoubleToBits(C->getValue()), VT); 875 } 876 break; 877 } 878 879 unsigned OpOpcode = Operand.Val->getOpcode(); 880 switch (Opcode) { 881 case ISD::TokenFactor: 882 return Operand; // Factor of one node? No factor. 883 case ISD::SIGN_EXTEND: 884 if (Operand.getValueType() == VT) return Operand; // noop extension 885 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 886 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 887 break; 888 case ISD::ZERO_EXTEND: 889 if (Operand.getValueType() == VT) return Operand; // noop extension 890 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x) 891 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0)); 892 break; 893 case ISD::ANY_EXTEND: 894 if (Operand.getValueType() == VT) return Operand; // noop extension 895 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) 896 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x) 897 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 898 break; 899 case ISD::TRUNCATE: 900 if (Operand.getValueType() == VT) return Operand; // noop truncate 901 if (OpOpcode == ISD::TRUNCATE) 902 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 903 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND || 904 OpOpcode == ISD::ANY_EXTEND) { 905 // If the source is smaller than the dest, we still need an extend. 906 if (Operand.Val->getOperand(0).getValueType() < VT) 907 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 908 else if (Operand.Val->getOperand(0).getValueType() > VT) 909 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 910 else 911 return Operand.Val->getOperand(0); 912 } 913 break; 914 case ISD::BIT_CONVERT: 915 // Basic sanity checking. 916 assert(MVT::getSizeInBits(VT)==MVT::getSizeInBits(Operand.getValueType()) && 917 "Cannot BIT_CONVERT between two different types!"); 918 if (VT == Operand.getValueType()) return Operand; // noop conversion. 919 if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x) 920 return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0)); 921 break; 922 case ISD::FNEG: 923 if (OpOpcode == ISD::FSUB) // -(X-Y) -> (Y-X) 924 return getNode(ISD::FSUB, VT, Operand.Val->getOperand(1), 925 Operand.Val->getOperand(0)); 926 if (OpOpcode == ISD::FNEG) // --X -> X 927 return Operand.Val->getOperand(0); 928 break; 929 case ISD::FABS: 930 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X) 931 return getNode(ISD::FABS, VT, Operand.Val->getOperand(0)); 932 break; 933 } 934 935 SDNode *N; 936 if (VT != MVT::Flag) { // Don't CSE flag producing nodes 937 SDNode *&E = UnaryOps[std::make_pair(Opcode, std::make_pair(Operand, VT))]; 938 if (E) return SDOperand(E, 0); 939 E = N = new SDNode(Opcode, Operand); 940 } else { 941 N = new SDNode(Opcode, Operand); 942 } 943 N->setValueTypes(VT); 944 AllNodes.push_back(N); 945 return SDOperand(N, 0); 946} 947 948 949 950SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 951 SDOperand N1, SDOperand N2) { 952#ifndef NDEBUG 953 switch (Opcode) { 954 case ISD::TokenFactor: 955 assert(VT == MVT::Other && N1.getValueType() == MVT::Other && 956 N2.getValueType() == MVT::Other && "Invalid token factor!"); 957 break; 958 case ISD::AND: 959 case ISD::OR: 960 case ISD::XOR: 961 case ISD::UDIV: 962 case ISD::UREM: 963 case ISD::MULHU: 964 case ISD::MULHS: 965 assert(MVT::isInteger(VT) && "This operator does not apply to FP types!"); 966 // fall through 967 case ISD::ADD: 968 case ISD::SUB: 969 case ISD::MUL: 970 case ISD::SDIV: 971 case ISD::SREM: 972 assert(MVT::isInteger(N1.getValueType()) && "Should use F* for FP ops"); 973 // fall through. 974 case ISD::FADD: 975 case ISD::FSUB: 976 case ISD::FMUL: 977 case ISD::FDIV: 978 case ISD::FREM: 979 assert(N1.getValueType() == N2.getValueType() && 980 N1.getValueType() == VT && "Binary operator types must match!"); 981 break; 982 983 case ISD::SHL: 984 case ISD::SRA: 985 case ISD::SRL: 986 case ISD::ROTL: 987 case ISD::ROTR: 988 assert(VT == N1.getValueType() && 989 "Shift operators return type must be the same as their first arg"); 990 assert(MVT::isInteger(VT) && MVT::isInteger(N2.getValueType()) && 991 VT != MVT::i1 && "Shifts only work on integers"); 992 break; 993 case ISD::FP_ROUND_INREG: { 994 MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT(); 995 assert(VT == N1.getValueType() && "Not an inreg round!"); 996 assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) && 997 "Cannot FP_ROUND_INREG integer types"); 998 assert(EVT <= VT && "Not rounding down!"); 999 break; 1000 } 1001 case ISD::AssertSext: 1002 case ISD::AssertZext: 1003 case ISD::SIGN_EXTEND_INREG: { 1004 MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT(); 1005 assert(VT == N1.getValueType() && "Not an inreg extend!"); 1006 assert(MVT::isInteger(VT) && MVT::isInteger(EVT) && 1007 "Cannot *_EXTEND_INREG FP types"); 1008 assert(EVT <= VT && "Not extending!"); 1009 } 1010 1011 default: break; 1012 } 1013#endif 1014 1015 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 1016 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 1017 if (N1C) { 1018 if (N2C) { 1019 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 1020 switch (Opcode) { 1021 case ISD::ADD: return getConstant(C1 + C2, VT); 1022 case ISD::SUB: return getConstant(C1 - C2, VT); 1023 case ISD::MUL: return getConstant(C1 * C2, VT); 1024 case ISD::UDIV: 1025 if (C2) return getConstant(C1 / C2, VT); 1026 break; 1027 case ISD::UREM : 1028 if (C2) return getConstant(C1 % C2, VT); 1029 break; 1030 case ISD::SDIV : 1031 if (C2) return getConstant(N1C->getSignExtended() / 1032 N2C->getSignExtended(), VT); 1033 break; 1034 case ISD::SREM : 1035 if (C2) return getConstant(N1C->getSignExtended() % 1036 N2C->getSignExtended(), VT); 1037 break; 1038 case ISD::AND : return getConstant(C1 & C2, VT); 1039 case ISD::OR : return getConstant(C1 | C2, VT); 1040 case ISD::XOR : return getConstant(C1 ^ C2, VT); 1041 case ISD::SHL : return getConstant(C1 << C2, VT); 1042 case ISD::SRL : return getConstant(C1 >> C2, VT); 1043 case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT); 1044 case ISD::ROTL : 1045 return getConstant((C1 << C2) | (C1 >> (MVT::getSizeInBits(VT) - C2)), 1046 VT); 1047 case ISD::ROTR : 1048 return getConstant((C1 >> C2) | (C1 << (MVT::getSizeInBits(VT) - C2)), 1049 VT); 1050 default: break; 1051 } 1052 } else { // Cannonicalize constant to RHS if commutative 1053 if (isCommutativeBinOp(Opcode)) { 1054 std::swap(N1C, N2C); 1055 std::swap(N1, N2); 1056 } 1057 } 1058 } 1059 1060 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val); 1061 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val); 1062 if (N1CFP) { 1063 if (N2CFP) { 1064 double C1 = N1CFP->getValue(), C2 = N2CFP->getValue(); 1065 switch (Opcode) { 1066 case ISD::FADD: return getConstantFP(C1 + C2, VT); 1067 case ISD::FSUB: return getConstantFP(C1 - C2, VT); 1068 case ISD::FMUL: return getConstantFP(C1 * C2, VT); 1069 case ISD::FDIV: 1070 if (C2) return getConstantFP(C1 / C2, VT); 1071 break; 1072 case ISD::FREM : 1073 if (C2) return getConstantFP(fmod(C1, C2), VT); 1074 break; 1075 default: break; 1076 } 1077 } else { // Cannonicalize constant to RHS if commutative 1078 if (isCommutativeBinOp(Opcode)) { 1079 std::swap(N1CFP, N2CFP); 1080 std::swap(N1, N2); 1081 } 1082 } 1083 } 1084 1085 // Finally, fold operations that do not require constants. 1086 switch (Opcode) { 1087 case ISD::FP_ROUND_INREG: 1088 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding. 1089 break; 1090 case ISD::SIGN_EXTEND_INREG: { 1091 MVT::ValueType EVT = cast<VTSDNode>(N2)->getVT(); 1092 if (EVT == VT) return N1; // Not actually extending 1093 break; 1094 } 1095 1096 // FIXME: figure out how to safely handle things like 1097 // int foo(int x) { return 1 << (x & 255); } 1098 // int bar() { return foo(256); } 1099#if 0 1100 case ISD::SHL: 1101 case ISD::SRL: 1102 case ISD::SRA: 1103 if (N2.getOpcode() == ISD::SIGN_EXTEND_INREG && 1104 cast<VTSDNode>(N2.getOperand(1))->getVT() != MVT::i1) 1105 return getNode(Opcode, VT, N1, N2.getOperand(0)); 1106 else if (N2.getOpcode() == ISD::AND) 1107 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N2.getOperand(1))) { 1108 // If the and is only masking out bits that cannot effect the shift, 1109 // eliminate the and. 1110 unsigned NumBits = MVT::getSizeInBits(VT); 1111 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 1112 return getNode(Opcode, VT, N1, N2.getOperand(0)); 1113 } 1114 break; 1115#endif 1116 } 1117 1118 // Memoize this node if possible. 1119 SDNode *N; 1120 if (Opcode != ISD::CALLSEQ_START && Opcode != ISD::CALLSEQ_END && 1121 VT != MVT::Flag) { 1122 SDNode *&BON = BinaryOps[std::make_pair(Opcode, std::make_pair(N1, N2))]; 1123 if (BON) return SDOperand(BON, 0); 1124 1125 BON = N = new SDNode(Opcode, N1, N2); 1126 } else { 1127 N = new SDNode(Opcode, N1, N2); 1128 } 1129 1130 N->setValueTypes(VT); 1131 AllNodes.push_back(N); 1132 return SDOperand(N, 0); 1133} 1134 1135SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1136 SDOperand N1, SDOperand N2, SDOperand N3) { 1137 // Perform various simplifications. 1138 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 1139 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 1140 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.Val); 1141 switch (Opcode) { 1142 case ISD::SETCC: { 1143 // Use SimplifySetCC to simplify SETCC's. 1144 SDOperand Simp = SimplifySetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get()); 1145 if (Simp.Val) return Simp; 1146 break; 1147 } 1148 case ISD::SELECT: 1149 if (N1C) 1150 if (N1C->getValue()) 1151 return N2; // select true, X, Y -> X 1152 else 1153 return N3; // select false, X, Y -> Y 1154 1155 if (N2 == N3) return N2; // select C, X, X -> X 1156 break; 1157 case ISD::BRCOND: 1158 if (N2C) 1159 if (N2C->getValue()) // Unconditional branch 1160 return getNode(ISD::BR, MVT::Other, N1, N3); 1161 else 1162 return N1; // Never-taken branch 1163 break; 1164 } 1165 1166 std::vector<SDOperand> Ops; 1167 Ops.reserve(3); 1168 Ops.push_back(N1); 1169 Ops.push_back(N2); 1170 Ops.push_back(N3); 1171 1172 // Memoize node if it doesn't produce a flag. 1173 SDNode *N; 1174 if (VT != MVT::Flag) { 1175 SDNode *&E = OneResultNodes[std::make_pair(Opcode,std::make_pair(VT, Ops))]; 1176 if (E) return SDOperand(E, 0); 1177 E = N = new SDNode(Opcode, N1, N2, N3); 1178 } else { 1179 N = new SDNode(Opcode, N1, N2, N3); 1180 } 1181 N->setValueTypes(VT); 1182 AllNodes.push_back(N); 1183 return SDOperand(N, 0); 1184} 1185 1186SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1187 SDOperand N1, SDOperand N2, SDOperand N3, 1188 SDOperand N4) { 1189 std::vector<SDOperand> Ops; 1190 Ops.reserve(4); 1191 Ops.push_back(N1); 1192 Ops.push_back(N2); 1193 Ops.push_back(N3); 1194 Ops.push_back(N4); 1195 return getNode(Opcode, VT, Ops); 1196} 1197 1198SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1199 SDOperand N1, SDOperand N2, SDOperand N3, 1200 SDOperand N4, SDOperand N5) { 1201 std::vector<SDOperand> Ops; 1202 Ops.reserve(5); 1203 Ops.push_back(N1); 1204 Ops.push_back(N2); 1205 Ops.push_back(N3); 1206 Ops.push_back(N4); 1207 Ops.push_back(N5); 1208 return getNode(Opcode, VT, Ops); 1209} 1210 1211// setAdjCallChain - This method changes the token chain of an 1212// CALLSEQ_START/END node to be the specified operand. 1213void SDNode::setAdjCallChain(SDOperand N) { 1214 assert(N.getValueType() == MVT::Other); 1215 assert((getOpcode() == ISD::CALLSEQ_START || 1216 getOpcode() == ISD::CALLSEQ_END) && "Cannot adjust this node!"); 1217 1218 OperandList[0].Val->removeUser(this); 1219 OperandList[0] = N; 1220 OperandList[0].Val->Uses.push_back(this); 1221} 1222 1223 1224 1225SDOperand SelectionDAG::getLoad(MVT::ValueType VT, 1226 SDOperand Chain, SDOperand Ptr, 1227 SDOperand SV) { 1228 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, VT))]; 1229 if (N) return SDOperand(N, 0); 1230 N = new SDNode(ISD::LOAD, Chain, Ptr, SV); 1231 1232 // Loads have a token chain. 1233 setNodeValueTypes(N, VT, MVT::Other); 1234 AllNodes.push_back(N); 1235 return SDOperand(N, 0); 1236} 1237 1238SDOperand SelectionDAG::getVecLoad(unsigned Count, MVT::ValueType EVT, 1239 SDOperand Chain, SDOperand Ptr, 1240 SDOperand SV) { 1241 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, EVT))]; 1242 if (N) return SDOperand(N, 0); 1243 std::vector<SDOperand> Ops; 1244 Ops.reserve(5); 1245 Ops.push_back(Chain); 1246 Ops.push_back(Ptr); 1247 Ops.push_back(getConstant(Count, MVT::i32)); 1248 Ops.push_back(getValueType(EVT)); 1249 Ops.push_back(SV); 1250 std::vector<MVT::ValueType> VTs; 1251 VTs.reserve(2); 1252 VTs.push_back(MVT::Vector); VTs.push_back(MVT::Other); // Add token chain. 1253 return getNode(ISD::VLOAD, VTs, Ops); 1254} 1255 1256SDOperand SelectionDAG::getExtLoad(unsigned Opcode, MVT::ValueType VT, 1257 SDOperand Chain, SDOperand Ptr, SDOperand SV, 1258 MVT::ValueType EVT) { 1259 std::vector<SDOperand> Ops; 1260 Ops.reserve(4); 1261 Ops.push_back(Chain); 1262 Ops.push_back(Ptr); 1263 Ops.push_back(SV); 1264 Ops.push_back(getValueType(EVT)); 1265 std::vector<MVT::ValueType> VTs; 1266 VTs.reserve(2); 1267 VTs.push_back(VT); VTs.push_back(MVT::Other); // Add token chain. 1268 return getNode(Opcode, VTs, Ops); 1269} 1270 1271SDOperand SelectionDAG::getSrcValue(const Value *V, int Offset) { 1272 assert((!V || isa<PointerType>(V->getType())) && 1273 "SrcValue is not a pointer?"); 1274 SDNode *&N = ValueNodes[std::make_pair(V, Offset)]; 1275 if (N) return SDOperand(N, 0); 1276 1277 N = new SrcValueSDNode(V, Offset); 1278 AllNodes.push_back(N); 1279 return SDOperand(N, 0); 1280} 1281 1282SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1283 std::vector<SDOperand> &Ops) { 1284 switch (Ops.size()) { 1285 case 0: return getNode(Opcode, VT); 1286 case 1: return getNode(Opcode, VT, Ops[0]); 1287 case 2: return getNode(Opcode, VT, Ops[0], Ops[1]); 1288 case 3: return getNode(Opcode, VT, Ops[0], Ops[1], Ops[2]); 1289 default: break; 1290 } 1291 1292 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(Ops[1].Val); 1293 switch (Opcode) { 1294 default: break; 1295 case ISD::BRCONDTWOWAY: 1296 if (N1C) 1297 if (N1C->getValue()) // Unconditional branch to true dest. 1298 return getNode(ISD::BR, MVT::Other, Ops[0], Ops[2]); 1299 else // Unconditional branch to false dest. 1300 return getNode(ISD::BR, MVT::Other, Ops[0], Ops[3]); 1301 break; 1302 case ISD::BRTWOWAY_CC: 1303 assert(Ops.size() == 6 && "BRTWOWAY_CC takes 6 operands!"); 1304 assert(Ops[2].getValueType() == Ops[3].getValueType() && 1305 "LHS and RHS of comparison must have same type!"); 1306 break; 1307 case ISD::TRUNCSTORE: { 1308 assert(Ops.size() == 5 && "TRUNCSTORE takes 5 operands!"); 1309 MVT::ValueType EVT = cast<VTSDNode>(Ops[4])->getVT(); 1310#if 0 // FIXME: If the target supports EVT natively, convert to a truncate/store 1311 // If this is a truncating store of a constant, convert to the desired type 1312 // and store it instead. 1313 if (isa<Constant>(Ops[0])) { 1314 SDOperand Op = getNode(ISD::TRUNCATE, EVT, N1); 1315 if (isa<Constant>(Op)) 1316 N1 = Op; 1317 } 1318 // Also for ConstantFP? 1319#endif 1320 if (Ops[0].getValueType() == EVT) // Normal store? 1321 return getNode(ISD::STORE, VT, Ops[0], Ops[1], Ops[2], Ops[3]); 1322 assert(Ops[1].getValueType() > EVT && "Not a truncation?"); 1323 assert(MVT::isInteger(Ops[1].getValueType()) == MVT::isInteger(EVT) && 1324 "Can't do FP-INT conversion!"); 1325 break; 1326 } 1327 case ISD::SELECT_CC: { 1328 assert(Ops.size() == 5 && "SELECT_CC takes 5 operands!"); 1329 assert(Ops[0].getValueType() == Ops[1].getValueType() && 1330 "LHS and RHS of condition must have same type!"); 1331 assert(Ops[2].getValueType() == Ops[3].getValueType() && 1332 "True and False arms of SelectCC must have same type!"); 1333 assert(Ops[2].getValueType() == VT && 1334 "select_cc node must be of same type as true and false value!"); 1335 break; 1336 } 1337 case ISD::BR_CC: { 1338 assert(Ops.size() == 5 && "BR_CC takes 5 operands!"); 1339 assert(Ops[2].getValueType() == Ops[3].getValueType() && 1340 "LHS/RHS of comparison should match types!"); 1341 break; 1342 } 1343 } 1344 1345 // Memoize nodes. 1346 SDNode *N; 1347 if (VT != MVT::Flag) { 1348 SDNode *&E = 1349 OneResultNodes[std::make_pair(Opcode, std::make_pair(VT, Ops))]; 1350 if (E) return SDOperand(E, 0); 1351 E = N = new SDNode(Opcode, Ops); 1352 } else { 1353 N = new SDNode(Opcode, Ops); 1354 } 1355 N->setValueTypes(VT); 1356 AllNodes.push_back(N); 1357 return SDOperand(N, 0); 1358} 1359 1360SDOperand SelectionDAG::getNode(unsigned Opcode, 1361 std::vector<MVT::ValueType> &ResultTys, 1362 std::vector<SDOperand> &Ops) { 1363 if (ResultTys.size() == 1) 1364 return getNode(Opcode, ResultTys[0], Ops); 1365 1366 switch (Opcode) { 1367 case ISD::EXTLOAD: 1368 case ISD::SEXTLOAD: 1369 case ISD::ZEXTLOAD: { 1370 MVT::ValueType EVT = cast<VTSDNode>(Ops[3])->getVT(); 1371 assert(Ops.size() == 4 && ResultTys.size() == 2 && "Bad *EXTLOAD!"); 1372 // If they are asking for an extending load from/to the same thing, return a 1373 // normal load. 1374 if (ResultTys[0] == EVT) 1375 return getLoad(ResultTys[0], Ops[0], Ops[1], Ops[2]); 1376 assert(EVT < ResultTys[0] && 1377 "Should only be an extending load, not truncating!"); 1378 assert((Opcode == ISD::EXTLOAD || MVT::isInteger(ResultTys[0])) && 1379 "Cannot sign/zero extend a FP load!"); 1380 assert(MVT::isInteger(ResultTys[0]) == MVT::isInteger(EVT) && 1381 "Cannot convert from FP to Int or Int -> FP!"); 1382 break; 1383 } 1384 1385 // FIXME: figure out how to safely handle things like 1386 // int foo(int x) { return 1 << (x & 255); } 1387 // int bar() { return foo(256); } 1388#if 0 1389 case ISD::SRA_PARTS: 1390 case ISD::SRL_PARTS: 1391 case ISD::SHL_PARTS: 1392 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG && 1393 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1) 1394 return getNode(Opcode, VT, N1, N2, N3.getOperand(0)); 1395 else if (N3.getOpcode() == ISD::AND) 1396 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) { 1397 // If the and is only masking out bits that cannot effect the shift, 1398 // eliminate the and. 1399 unsigned NumBits = MVT::getSizeInBits(VT)*2; 1400 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 1401 return getNode(Opcode, VT, N1, N2, N3.getOperand(0)); 1402 } 1403 break; 1404#endif 1405 } 1406 1407 // Memoize the node unless it returns a flag. 1408 SDNode *N; 1409 if (ResultTys.back() != MVT::Flag) { 1410 SDNode *&E = 1411 ArbitraryNodes[std::make_pair(Opcode, std::make_pair(ResultTys, Ops))]; 1412 if (E) return SDOperand(E, 0); 1413 E = N = new SDNode(Opcode, Ops); 1414 } else { 1415 N = new SDNode(Opcode, Ops); 1416 } 1417 setNodeValueTypes(N, ResultTys); 1418 AllNodes.push_back(N); 1419 return SDOperand(N, 0); 1420} 1421 1422void SelectionDAG::setNodeValueTypes(SDNode *N, 1423 std::vector<MVT::ValueType> &RetVals) { 1424 switch (RetVals.size()) { 1425 case 0: return; 1426 case 1: N->setValueTypes(RetVals[0]); return; 1427 case 2: setNodeValueTypes(N, RetVals[0], RetVals[1]); return; 1428 default: break; 1429 } 1430 1431 std::list<std::vector<MVT::ValueType> >::iterator I = 1432 std::find(VTList.begin(), VTList.end(), RetVals); 1433 if (I == VTList.end()) { 1434 VTList.push_front(RetVals); 1435 I = VTList.begin(); 1436 } 1437 1438 N->setValueTypes(&(*I)[0], I->size()); 1439} 1440 1441void SelectionDAG::setNodeValueTypes(SDNode *N, MVT::ValueType VT1, 1442 MVT::ValueType VT2) { 1443 for (std::list<std::vector<MVT::ValueType> >::iterator I = VTList.begin(), 1444 E = VTList.end(); I != E; ++I) { 1445 if (I->size() == 2 && (*I)[0] == VT1 && (*I)[1] == VT2) { 1446 N->setValueTypes(&(*I)[0], 2); 1447 return; 1448 } 1449 } 1450 std::vector<MVT::ValueType> V; 1451 V.push_back(VT1); 1452 V.push_back(VT2); 1453 VTList.push_front(V); 1454 N->setValueTypes(&(*VTList.begin())[0], 2); 1455} 1456 1457 1458/// SelectNodeTo - These are used for target selectors to *mutate* the 1459/// specified node to have the specified return type, Target opcode, and 1460/// operands. Note that target opcodes are stored as 1461/// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. 1462/// 1463/// Note that SelectNodeTo returns the resultant node. If there is already a 1464/// node of the specified opcode and operands, it returns that node instead of 1465/// the current one. 1466SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1467 MVT::ValueType VT) { 1468 // If an identical node already exists, use it. 1469 SDNode *&ON = NullaryOps[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, VT)]; 1470 if (ON) return SDOperand(ON, 0); 1471 1472 RemoveNodeFromCSEMaps(N); 1473 1474 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1475 N->setValueTypes(VT); 1476 1477 ON = N; // Memoize the new node. 1478 return SDOperand(N, 0); 1479} 1480 1481SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1482 MVT::ValueType VT, SDOperand Op1) { 1483 // If an identical node already exists, use it. 1484 SDNode *&ON = UnaryOps[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1485 std::make_pair(Op1, VT))]; 1486 if (ON) return SDOperand(ON, 0); 1487 1488 RemoveNodeFromCSEMaps(N); 1489 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1490 N->setValueTypes(VT); 1491 N->setOperands(Op1); 1492 1493 ON = N; // Memoize the new node. 1494 return SDOperand(N, 0); 1495} 1496 1497SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1498 MVT::ValueType VT, SDOperand Op1, 1499 SDOperand Op2) { 1500 // If an identical node already exists, use it. 1501 SDNode *&ON = BinaryOps[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1502 std::make_pair(Op1, Op2))]; 1503 if (ON) return SDOperand(ON, 0); 1504 1505 RemoveNodeFromCSEMaps(N); 1506 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1507 N->setValueTypes(VT); 1508 N->setOperands(Op1, Op2); 1509 1510 ON = N; // Memoize the new node. 1511 return SDOperand(N, 0); 1512} 1513 1514SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1515 MVT::ValueType VT, SDOperand Op1, 1516 SDOperand Op2, SDOperand Op3) { 1517 // If an identical node already exists, use it. 1518 std::vector<SDOperand> OpList; 1519 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1520 SDNode *&ON = OneResultNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1521 std::make_pair(VT, OpList))]; 1522 if (ON) return SDOperand(ON, 0); 1523 1524 RemoveNodeFromCSEMaps(N); 1525 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1526 N->setValueTypes(VT); 1527 N->setOperands(Op1, Op2, Op3); 1528 1529 ON = N; // Memoize the new node. 1530 return SDOperand(N, 0); 1531} 1532 1533SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1534 MVT::ValueType VT, SDOperand Op1, 1535 SDOperand Op2, SDOperand Op3, 1536 SDOperand Op4) { 1537 // If an identical node already exists, use it. 1538 std::vector<SDOperand> OpList; 1539 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1540 OpList.push_back(Op4); 1541 SDNode *&ON = OneResultNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1542 std::make_pair(VT, OpList))]; 1543 if (ON) return SDOperand(ON, 0); 1544 1545 RemoveNodeFromCSEMaps(N); 1546 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1547 N->setValueTypes(VT); 1548 N->setOperands(Op1, Op2, Op3, Op4); 1549 1550 ON = N; // Memoize the new node. 1551 return SDOperand(N, 0); 1552} 1553 1554SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1555 MVT::ValueType VT, SDOperand Op1, 1556 SDOperand Op2, SDOperand Op3,SDOperand Op4, 1557 SDOperand Op5) { 1558 // If an identical node already exists, use it. 1559 std::vector<SDOperand> OpList; 1560 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1561 OpList.push_back(Op4); OpList.push_back(Op5); 1562 SDNode *&ON = OneResultNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1563 std::make_pair(VT, OpList))]; 1564 if (ON) return SDOperand(ON, 0); 1565 1566 RemoveNodeFromCSEMaps(N); 1567 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1568 N->setValueTypes(VT); 1569 N->setOperands(Op1, Op2, Op3, Op4, Op5); 1570 1571 ON = N; // Memoize the new node. 1572 return SDOperand(N, 0); 1573} 1574 1575SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1576 MVT::ValueType VT, SDOperand Op1, 1577 SDOperand Op2, SDOperand Op3,SDOperand Op4, 1578 SDOperand Op5, SDOperand Op6) { 1579 // If an identical node already exists, use it. 1580 std::vector<SDOperand> OpList; 1581 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1582 OpList.push_back(Op4); OpList.push_back(Op5); OpList.push_back(Op6); 1583 SDNode *&ON = OneResultNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1584 std::make_pair(VT, OpList))]; 1585 if (ON) return SDOperand(ON, 0); 1586 1587 RemoveNodeFromCSEMaps(N); 1588 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1589 N->setValueTypes(VT); 1590 N->setOperands(Op1, Op2, Op3, Op4, Op5, Op6); 1591 1592 ON = N; // Memoize the new node. 1593 return SDOperand(N, 0); 1594} 1595 1596SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1597 MVT::ValueType VT1, MVT::ValueType VT2, 1598 SDOperand Op1, SDOperand Op2) { 1599 // If an identical node already exists, use it. 1600 std::vector<SDOperand> OpList; 1601 OpList.push_back(Op1); OpList.push_back(Op2); 1602 std::vector<MVT::ValueType> VTList; 1603 VTList.push_back(VT1); VTList.push_back(VT2); 1604 SDNode *&ON = ArbitraryNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1605 std::make_pair(VTList, OpList))]; 1606 if (ON) return SDOperand(ON, 0); 1607 1608 RemoveNodeFromCSEMaps(N); 1609 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1610 setNodeValueTypes(N, VT1, VT2); 1611 N->setOperands(Op1, Op2); 1612 1613 ON = N; // Memoize the new node. 1614 return SDOperand(N, 0); 1615} 1616 1617SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1618 MVT::ValueType VT1, MVT::ValueType VT2, 1619 SDOperand Op1, SDOperand Op2, 1620 SDOperand Op3) { 1621 // If an identical node already exists, use it. 1622 std::vector<SDOperand> OpList; 1623 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1624 std::vector<MVT::ValueType> VTList; 1625 VTList.push_back(VT1); VTList.push_back(VT2); 1626 SDNode *&ON = ArbitraryNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1627 std::make_pair(VTList, OpList))]; 1628 if (ON) return SDOperand(ON, 0); 1629 1630 RemoveNodeFromCSEMaps(N); 1631 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1632 setNodeValueTypes(N, VT1, VT2); 1633 N->setOperands(Op1, Op2, Op3); 1634 1635 ON = N; // Memoize the new node. 1636 return SDOperand(N, 0); 1637} 1638 1639SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1640 MVT::ValueType VT1, MVT::ValueType VT2, 1641 SDOperand Op1, SDOperand Op2, 1642 SDOperand Op3, SDOperand Op4) { 1643 // If an identical node already exists, use it. 1644 std::vector<SDOperand> OpList; 1645 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1646 OpList.push_back(Op4); 1647 std::vector<MVT::ValueType> VTList; 1648 VTList.push_back(VT1); VTList.push_back(VT2); 1649 SDNode *&ON = ArbitraryNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1650 std::make_pair(VTList, OpList))]; 1651 if (ON) return SDOperand(ON, 0); 1652 1653 RemoveNodeFromCSEMaps(N); 1654 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1655 setNodeValueTypes(N, VT1, VT2); 1656 N->setOperands(Op1, Op2, Op3, Op4); 1657 1658 ON = N; // Memoize the new node. 1659 return SDOperand(N, 0); 1660} 1661 1662SDOperand SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc, 1663 MVT::ValueType VT1, MVT::ValueType VT2, 1664 SDOperand Op1, SDOperand Op2, 1665 SDOperand Op3, SDOperand Op4, 1666 SDOperand Op5) { 1667 // If an identical node already exists, use it. 1668 std::vector<SDOperand> OpList; 1669 OpList.push_back(Op1); OpList.push_back(Op2); OpList.push_back(Op3); 1670 OpList.push_back(Op4); OpList.push_back(Op5); 1671 std::vector<MVT::ValueType> VTList; 1672 VTList.push_back(VT1); VTList.push_back(VT2); 1673 SDNode *&ON = ArbitraryNodes[std::make_pair(ISD::BUILTIN_OP_END+TargetOpc, 1674 std::make_pair(VTList, OpList))]; 1675 if (ON) return SDOperand(ON, 0); 1676 1677 RemoveNodeFromCSEMaps(N); 1678 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc); 1679 setNodeValueTypes(N, VT1, VT2); 1680 N->setOperands(Op1, Op2, Op3, Op4, Op5); 1681 1682 ON = N; // Memoize the new node. 1683 return SDOperand(N, 0); 1684} 1685 1686// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 1687/// This can cause recursive merging of nodes in the DAG. 1688/// 1689/// This version assumes From/To have a single result value. 1690/// 1691void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand ToN, 1692 std::vector<SDNode*> *Deleted) { 1693 SDNode *From = FromN.Val, *To = ToN.Val; 1694 assert(From->getNumValues() == 1 && To->getNumValues() == 1 && 1695 "Cannot replace with this method!"); 1696 assert(From != To && "Cannot replace uses of with self"); 1697 1698 while (!From->use_empty()) { 1699 // Process users until they are all gone. 1700 SDNode *U = *From->use_begin(); 1701 1702 // This node is about to morph, remove its old self from the CSE maps. 1703 RemoveNodeFromCSEMaps(U); 1704 1705 for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands; 1706 I != E; ++I) 1707 if (I->Val == From) { 1708 From->removeUser(U); 1709 I->Val = To; 1710 To->addUser(U); 1711 } 1712 1713 // Now that we have modified U, add it back to the CSE maps. If it already 1714 // exists there, recursively merge the results together. 1715 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) { 1716 ReplaceAllUsesWith(U, Existing, Deleted); 1717 // U is now dead. 1718 if (Deleted) Deleted->push_back(U); 1719 DeleteNodeNotInCSEMaps(U); 1720 } 1721 } 1722} 1723 1724/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 1725/// This can cause recursive merging of nodes in the DAG. 1726/// 1727/// This version assumes From/To have matching types and numbers of result 1728/// values. 1729/// 1730void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To, 1731 std::vector<SDNode*> *Deleted) { 1732 assert(From != To && "Cannot replace uses of with self"); 1733 assert(From->getNumValues() == To->getNumValues() && 1734 "Cannot use this version of ReplaceAllUsesWith!"); 1735 if (From->getNumValues() == 1) { // If possible, use the faster version. 1736 ReplaceAllUsesWith(SDOperand(From, 0), SDOperand(To, 0), Deleted); 1737 return; 1738 } 1739 1740 while (!From->use_empty()) { 1741 // Process users until they are all gone. 1742 SDNode *U = *From->use_begin(); 1743 1744 // This node is about to morph, remove its old self from the CSE maps. 1745 RemoveNodeFromCSEMaps(U); 1746 1747 for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands; 1748 I != E; ++I) 1749 if (I->Val == From) { 1750 From->removeUser(U); 1751 I->Val = To; 1752 To->addUser(U); 1753 } 1754 1755 // Now that we have modified U, add it back to the CSE maps. If it already 1756 // exists there, recursively merge the results together. 1757 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) { 1758 ReplaceAllUsesWith(U, Existing, Deleted); 1759 // U is now dead. 1760 if (Deleted) Deleted->push_back(U); 1761 DeleteNodeNotInCSEMaps(U); 1762 } 1763 } 1764} 1765 1766/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 1767/// This can cause recursive merging of nodes in the DAG. 1768/// 1769/// This version can replace From with any result values. To must match the 1770/// number and types of values returned by From. 1771void SelectionDAG::ReplaceAllUsesWith(SDNode *From, 1772 const std::vector<SDOperand> &To, 1773 std::vector<SDNode*> *Deleted) { 1774 assert(From->getNumValues() == To.size() && 1775 "Incorrect number of values to replace with!"); 1776 if (To.size() == 1 && To[0].Val->getNumValues() == 1) { 1777 // Degenerate case handled above. 1778 ReplaceAllUsesWith(SDOperand(From, 0), To[0], Deleted); 1779 return; 1780 } 1781 1782 while (!From->use_empty()) { 1783 // Process users until they are all gone. 1784 SDNode *U = *From->use_begin(); 1785 1786 // This node is about to morph, remove its old self from the CSE maps. 1787 RemoveNodeFromCSEMaps(U); 1788 1789 for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands; 1790 I != E; ++I) 1791 if (I->Val == From) { 1792 const SDOperand &ToOp = To[I->ResNo]; 1793 From->removeUser(U); 1794 *I = ToOp; 1795 ToOp.Val->addUser(U); 1796 } 1797 1798 // Now that we have modified U, add it back to the CSE maps. If it already 1799 // exists there, recursively merge the results together. 1800 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) { 1801 ReplaceAllUsesWith(U, Existing, Deleted); 1802 // U is now dead. 1803 if (Deleted) Deleted->push_back(U); 1804 DeleteNodeNotInCSEMaps(U); 1805 } 1806 } 1807} 1808 1809 1810//===----------------------------------------------------------------------===// 1811// SDNode Class 1812//===----------------------------------------------------------------------===// 1813 1814 1815/// getValueTypeList - Return a pointer to the specified value type. 1816/// 1817MVT::ValueType *SDNode::getValueTypeList(MVT::ValueType VT) { 1818 static MVT::ValueType VTs[MVT::LAST_VALUETYPE]; 1819 VTs[VT] = VT; 1820 return &VTs[VT]; 1821} 1822 1823/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 1824/// indicated value. This method ignores uses of other values defined by this 1825/// operation. 1826bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) { 1827 assert(Value < getNumValues() && "Bad value!"); 1828 1829 // If there is only one value, this is easy. 1830 if (getNumValues() == 1) 1831 return use_size() == NUses; 1832 if (Uses.size() < NUses) return false; 1833 1834 SDOperand TheValue(this, Value); 1835 1836 std::set<SDNode*> UsersHandled; 1837 1838 for (std::vector<SDNode*>::iterator UI = Uses.begin(), E = Uses.end(); 1839 UI != E; ++UI) { 1840 SDNode *User = *UI; 1841 if (User->getNumOperands() == 1 || 1842 UsersHandled.insert(User).second) // First time we've seen this? 1843 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) 1844 if (User->getOperand(i) == TheValue) { 1845 if (NUses == 0) 1846 return false; // too many uses 1847 --NUses; 1848 } 1849 } 1850 1851 // Found exactly the right number of uses? 1852 return NUses == 0; 1853} 1854 1855 1856const char *SDNode::getOperationName(const SelectionDAG *G) const { 1857 switch (getOpcode()) { 1858 default: 1859 if (getOpcode() < ISD::BUILTIN_OP_END) 1860 return "<<Unknown DAG Node>>"; 1861 else { 1862 if (G) { 1863 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo()) 1864 if (getOpcode()-ISD::BUILTIN_OP_END < TII->getNumOpcodes()) 1865 return TII->getName(getOpcode()-ISD::BUILTIN_OP_END); 1866 1867 TargetLowering &TLI = G->getTargetLoweringInfo(); 1868 const char *Name = 1869 TLI.getTargetNodeName(getOpcode()); 1870 if (Name) return Name; 1871 } 1872 1873 return "<<Unknown Target Node>>"; 1874 } 1875 1876 case ISD::PCMARKER: return "PCMarker"; 1877 case ISD::READCYCLECOUNTER: return "ReadCycleCounter"; 1878 case ISD::SRCVALUE: return "SrcValue"; 1879 case ISD::VALUETYPE: return "ValueType"; 1880 case ISD::STRING: return "String"; 1881 case ISD::EntryToken: return "EntryToken"; 1882 case ISD::TokenFactor: return "TokenFactor"; 1883 case ISD::AssertSext: return "AssertSext"; 1884 case ISD::AssertZext: return "AssertZext"; 1885 case ISD::Constant: return "Constant"; 1886 case ISD::TargetConstant: return "TargetConstant"; 1887 case ISD::ConstantFP: return "ConstantFP"; 1888 case ISD::ConstantVec: return "ConstantVec"; 1889 case ISD::GlobalAddress: return "GlobalAddress"; 1890 case ISD::TargetGlobalAddress: return "TargetGlobalAddress"; 1891 case ISD::FrameIndex: return "FrameIndex"; 1892 case ISD::TargetFrameIndex: return "TargetFrameIndex"; 1893 case ISD::BasicBlock: return "BasicBlock"; 1894 case ISD::Register: return "Register"; 1895 case ISD::ExternalSymbol: return "ExternalSymbol"; 1896 case ISD::TargetExternalSymbol: return "TargetExternalSymbol"; 1897 case ISD::ConstantPool: return "ConstantPool"; 1898 case ISD::TargetConstantPool: return "TargetConstantPool"; 1899 case ISD::CopyToReg: return "CopyToReg"; 1900 case ISD::CopyFromReg: return "CopyFromReg"; 1901 case ISD::UNDEF: return "undef"; 1902 1903 // Unary operators 1904 case ISD::FABS: return "fabs"; 1905 case ISD::FNEG: return "fneg"; 1906 case ISD::FSQRT: return "fsqrt"; 1907 case ISD::FSIN: return "fsin"; 1908 case ISD::FCOS: return "fcos"; 1909 1910 // Binary operators 1911 case ISD::ADD: return "add"; 1912 case ISD::SUB: return "sub"; 1913 case ISD::MUL: return "mul"; 1914 case ISD::MULHU: return "mulhu"; 1915 case ISD::MULHS: return "mulhs"; 1916 case ISD::SDIV: return "sdiv"; 1917 case ISD::UDIV: return "udiv"; 1918 case ISD::SREM: return "srem"; 1919 case ISD::UREM: return "urem"; 1920 case ISD::AND: return "and"; 1921 case ISD::OR: return "or"; 1922 case ISD::XOR: return "xor"; 1923 case ISD::SHL: return "shl"; 1924 case ISD::SRA: return "sra"; 1925 case ISD::SRL: return "srl"; 1926 case ISD::ROTL: return "rotl"; 1927 case ISD::ROTR: return "rotr"; 1928 case ISD::BSWAP: return "bswap"; 1929 case ISD::FADD: return "fadd"; 1930 case ISD::FSUB: return "fsub"; 1931 case ISD::FMUL: return "fmul"; 1932 case ISD::FDIV: return "fdiv"; 1933 case ISD::FREM: return "frem"; 1934 case ISD::VADD: return "vadd"; 1935 case ISD::VSUB: return "vsub"; 1936 case ISD::VMUL: return "vmul"; 1937 1938 case ISD::SETCC: return "setcc"; 1939 case ISD::SELECT: return "select"; 1940 case ISD::SELECT_CC: return "select_cc"; 1941 case ISD::ADD_PARTS: return "add_parts"; 1942 case ISD::SUB_PARTS: return "sub_parts"; 1943 case ISD::SHL_PARTS: return "shl_parts"; 1944 case ISD::SRA_PARTS: return "sra_parts"; 1945 case ISD::SRL_PARTS: return "srl_parts"; 1946 1947 // Conversion operators. 1948 case ISD::SIGN_EXTEND: return "sign_extend"; 1949 case ISD::ZERO_EXTEND: return "zero_extend"; 1950 case ISD::ANY_EXTEND: return "any_extend"; 1951 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 1952 case ISD::TRUNCATE: return "truncate"; 1953 case ISD::FP_ROUND: return "fp_round"; 1954 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 1955 case ISD::FP_EXTEND: return "fp_extend"; 1956 1957 case ISD::SINT_TO_FP: return "sint_to_fp"; 1958 case ISD::UINT_TO_FP: return "uint_to_fp"; 1959 case ISD::FP_TO_SINT: return "fp_to_sint"; 1960 case ISD::FP_TO_UINT: return "fp_to_uint"; 1961 case ISD::BIT_CONVERT: return "bit_convert"; 1962 1963 // Control flow instructions 1964 case ISD::BR: return "br"; 1965 case ISD::BRCOND: return "brcond"; 1966 case ISD::BRCONDTWOWAY: return "brcondtwoway"; 1967 case ISD::BR_CC: return "br_cc"; 1968 case ISD::BRTWOWAY_CC: return "brtwoway_cc"; 1969 case ISD::RET: return "ret"; 1970 case ISD::CALL: return "call"; 1971 case ISD::TAILCALL:return "tailcall"; 1972 case ISD::CALLSEQ_START: return "callseq_start"; 1973 case ISD::CALLSEQ_END: return "callseq_end"; 1974 1975 // Other operators 1976 case ISD::LOAD: return "load"; 1977 case ISD::STORE: return "store"; 1978 case ISD::VLOAD: return "vload"; 1979 case ISD::EXTLOAD: return "extload"; 1980 case ISD::SEXTLOAD: return "sextload"; 1981 case ISD::ZEXTLOAD: return "zextload"; 1982 case ISD::TRUNCSTORE: return "truncstore"; 1983 1984 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 1985 case ISD::EXTRACT_ELEMENT: return "extract_element"; 1986 case ISD::BUILD_PAIR: return "build_pair"; 1987 case ISD::MEMSET: return "memset"; 1988 case ISD::MEMCPY: return "memcpy"; 1989 case ISD::MEMMOVE: return "memmove"; 1990 1991 // Bit counting 1992 case ISD::CTPOP: return "ctpop"; 1993 case ISD::CTTZ: return "cttz"; 1994 case ISD::CTLZ: return "ctlz"; 1995 1996 // IO Intrinsics 1997 case ISD::READPORT: return "readport"; 1998 case ISD::WRITEPORT: return "writeport"; 1999 case ISD::READIO: return "readio"; 2000 case ISD::WRITEIO: return "writeio"; 2001 2002 // Debug info 2003 case ISD::LOCATION: return "location"; 2004 case ISD::DEBUG_LOC: return "debug_loc"; 2005 case ISD::DEBUG_LABEL: return "debug_label"; 2006 2007 case ISD::CONDCODE: 2008 switch (cast<CondCodeSDNode>(this)->get()) { 2009 default: assert(0 && "Unknown setcc condition!"); 2010 case ISD::SETOEQ: return "setoeq"; 2011 case ISD::SETOGT: return "setogt"; 2012 case ISD::SETOGE: return "setoge"; 2013 case ISD::SETOLT: return "setolt"; 2014 case ISD::SETOLE: return "setole"; 2015 case ISD::SETONE: return "setone"; 2016 2017 case ISD::SETO: return "seto"; 2018 case ISD::SETUO: return "setuo"; 2019 case ISD::SETUEQ: return "setue"; 2020 case ISD::SETUGT: return "setugt"; 2021 case ISD::SETUGE: return "setuge"; 2022 case ISD::SETULT: return "setult"; 2023 case ISD::SETULE: return "setule"; 2024 case ISD::SETUNE: return "setune"; 2025 2026 case ISD::SETEQ: return "seteq"; 2027 case ISD::SETGT: return "setgt"; 2028 case ISD::SETGE: return "setge"; 2029 case ISD::SETLT: return "setlt"; 2030 case ISD::SETLE: return "setle"; 2031 case ISD::SETNE: return "setne"; 2032 } 2033 } 2034} 2035 2036void SDNode::dump() const { dump(0); } 2037void SDNode::dump(const SelectionDAG *G) const { 2038 std::cerr << (void*)this << ": "; 2039 2040 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 2041 if (i) std::cerr << ","; 2042 if (getValueType(i) == MVT::Other) 2043 std::cerr << "ch"; 2044 else 2045 std::cerr << MVT::getValueTypeString(getValueType(i)); 2046 } 2047 std::cerr << " = " << getOperationName(G); 2048 2049 std::cerr << " "; 2050 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 2051 if (i) std::cerr << ", "; 2052 std::cerr << (void*)getOperand(i).Val; 2053 if (unsigned RN = getOperand(i).ResNo) 2054 std::cerr << ":" << RN; 2055 } 2056 2057 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 2058 std::cerr << "<" << CSDN->getValue() << ">"; 2059 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 2060 std::cerr << "<" << CSDN->getValue() << ">"; 2061 } else if (const GlobalAddressSDNode *GADN = 2062 dyn_cast<GlobalAddressSDNode>(this)) { 2063 int offset = GADN->getOffset(); 2064 std::cerr << "<"; 2065 WriteAsOperand(std::cerr, GADN->getGlobal()) << ">"; 2066 if (offset > 0) 2067 std::cerr << " + " << offset; 2068 else 2069 std::cerr << " " << offset; 2070 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) { 2071 std::cerr << "<" << FIDN->getIndex() << ">"; 2072 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 2073 std::cerr << "<" << *CP->get() << ">"; 2074 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) { 2075 std::cerr << "<"; 2076 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 2077 if (LBB) 2078 std::cerr << LBB->getName() << " "; 2079 std::cerr << (const void*)BBDN->getBasicBlock() << ">"; 2080 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) { 2081 if (G && MRegisterInfo::isPhysicalRegister(R->getReg())) { 2082 std::cerr << " " <<G->getTarget().getRegisterInfo()->getName(R->getReg()); 2083 } else { 2084 std::cerr << " #" << R->getReg(); 2085 } 2086 } else if (const ExternalSymbolSDNode *ES = 2087 dyn_cast<ExternalSymbolSDNode>(this)) { 2088 std::cerr << "'" << ES->getSymbol() << "'"; 2089 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) { 2090 if (M->getValue()) 2091 std::cerr << "<" << M->getValue() << ":" << M->getOffset() << ">"; 2092 else 2093 std::cerr << "<null:" << M->getOffset() << ">"; 2094 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) { 2095 std::cerr << ":" << getValueTypeString(N->getVT()); 2096 } 2097} 2098 2099static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) { 2100 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 2101 if (N->getOperand(i).Val->hasOneUse()) 2102 DumpNodes(N->getOperand(i).Val, indent+2, G); 2103 else 2104 std::cerr << "\n" << std::string(indent+2, ' ') 2105 << (void*)N->getOperand(i).Val << ": <multiple use>"; 2106 2107 2108 std::cerr << "\n" << std::string(indent, ' '); 2109 N->dump(G); 2110} 2111 2112void SelectionDAG::dump() const { 2113 std::cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 2114 std::vector<const SDNode*> Nodes; 2115 for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end(); 2116 I != E; ++I) 2117 Nodes.push_back(I); 2118 2119 std::sort(Nodes.begin(), Nodes.end()); 2120 2121 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 2122 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val) 2123 DumpNodes(Nodes[i], 2, this); 2124 } 2125 2126 DumpNodes(getRoot().Val, 2, this); 2127 2128 std::cerr << "\n\n"; 2129} 2130 2131