SelectionDAG.cpp revision 859157daee6a4b49e99921832e1dde065167b317
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 <iostream> 20#include <set> 21#include <cmath> 22#include <algorithm> 23using namespace llvm; 24 25static bool isCommutativeBinOp(unsigned Opcode) { 26 switch (Opcode) { 27 case ISD::ADD: 28 case ISD::MUL: 29 case ISD::AND: 30 case ISD::OR: 31 case ISD::XOR: return true; 32 default: return false; // FIXME: Need commutative info for user ops! 33 } 34} 35 36static bool isAssociativeBinOp(unsigned Opcode) { 37 switch (Opcode) { 38 case ISD::ADD: 39 case ISD::MUL: 40 case ISD::AND: 41 case ISD::OR: 42 case ISD::XOR: return true; 43 default: return false; // FIXME: Need associative info for user ops! 44 } 45} 46 47static unsigned ExactLog2(uint64_t Val) { 48 unsigned Count = 0; 49 while (Val != 1) { 50 Val >>= 1; 51 ++Count; 52 } 53 return Count; 54} 55 56// isInvertibleForFree - Return true if there is no cost to emitting the logical 57// inverse of this node. 58static bool isInvertibleForFree(SDOperand N) { 59 if (isa<ConstantSDNode>(N.Val)) return true; 60 if (isa<SetCCSDNode>(N.Val) && N.Val->hasOneUse()) 61 return true; 62 return false; 63} 64 65 66/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 67/// when given the operation for (X op Y). 68ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) { 69 // To perform this operation, we just need to swap the L and G bits of the 70 // operation. 71 unsigned OldL = (Operation >> 2) & 1; 72 unsigned OldG = (Operation >> 1) & 1; 73 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits 74 (OldL << 1) | // New G bit 75 (OldG << 2)); // New L bit. 76} 77 78/// getSetCCInverse - Return the operation corresponding to !(X op Y), where 79/// 'op' is a valid SetCC operation. 80ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) { 81 unsigned Operation = Op; 82 if (isInteger) 83 Operation ^= 7; // Flip L, G, E bits, but not U. 84 else 85 Operation ^= 15; // Flip all of the condition bits. 86 if (Operation > ISD::SETTRUE2) 87 Operation &= ~8; // Don't let N and U bits get set. 88 return ISD::CondCode(Operation); 89} 90 91 92/// isSignedOp - For an integer comparison, return 1 if the comparison is a 93/// signed operation and 2 if the result is an unsigned comparison. Return zero 94/// if the operation does not depend on the sign of the input (setne and seteq). 95static int isSignedOp(ISD::CondCode Opcode) { 96 switch (Opcode) { 97 default: assert(0 && "Illegal integer setcc operation!"); 98 case ISD::SETEQ: 99 case ISD::SETNE: return 0; 100 case ISD::SETLT: 101 case ISD::SETLE: 102 case ISD::SETGT: 103 case ISD::SETGE: return 1; 104 case ISD::SETULT: 105 case ISD::SETULE: 106 case ISD::SETUGT: 107 case ISD::SETUGE: return 2; 108 } 109} 110 111/// getSetCCOrOperation - Return the result of a logical OR between different 112/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function 113/// returns SETCC_INVALID if it is not possible to represent the resultant 114/// comparison. 115ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2, 116 bool isInteger) { 117 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 118 // Cannot fold a signed integer setcc with an unsigned integer setcc. 119 return ISD::SETCC_INVALID; 120 121 unsigned Op = Op1 | Op2; // Combine all of the condition bits. 122 123 // If the N and U bits get set then the resultant comparison DOES suddenly 124 // care about orderedness, and is true when ordered. 125 if (Op > ISD::SETTRUE2) 126 Op &= ~16; // Clear the N bit. 127 return ISD::CondCode(Op); 128} 129 130/// getSetCCAndOperation - Return the result of a logical AND between different 131/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 132/// function returns zero if it is not possible to represent the resultant 133/// comparison. 134ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2, 135 bool isInteger) { 136 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 137 // Cannot fold a signed setcc with an unsigned setcc. 138 return ISD::SETCC_INVALID; 139 140 // Combine all of the condition bits. 141 return ISD::CondCode(Op1 & Op2); 142} 143 144/// RemoveDeadNodes - This method deletes all unreachable nodes in the 145/// SelectionDAG, including nodes (like loads) that have uses of their token 146/// chain but no other uses and no side effect. If a node is passed in as an 147/// argument, it is used as the seed for node deletion. 148void SelectionDAG::RemoveDeadNodes(SDNode *N) { 149 std::set<SDNode*> AllNodeSet(AllNodes.begin(), AllNodes.end()); 150 151 // Create a dummy node (which is not added to allnodes), that adds a reference 152 // to the root node, preventing it from being deleted. 153 SDNode *DummyNode = new SDNode(ISD::EntryToken, getRoot()); 154 155 DeleteNodeIfDead(N, &AllNodeSet); 156 157 Restart: 158 unsigned NumNodes = AllNodeSet.size(); 159 for (std::set<SDNode*>::iterator I = AllNodeSet.begin(), E = AllNodeSet.end(); 160 I != E; ++I) { 161 // Try to delete this node. 162 DeleteNodeIfDead(*I, &AllNodeSet); 163 164 // If we actually deleted any nodes, do not use invalid iterators in 165 // AllNodeSet. 166 if (AllNodeSet.size() != NumNodes) 167 goto Restart; 168 } 169 170 // Restore AllNodes. 171 if (AllNodes.size() != NumNodes) 172 AllNodes.assign(AllNodeSet.begin(), AllNodeSet.end()); 173 174 // If the root changed (e.g. it was a dead load, update the root). 175 setRoot(DummyNode->getOperand(0)); 176 177 // Now that we are done with the dummy node, delete it. 178 DummyNode->getOperand(0).Val->removeUser(DummyNode); 179 delete DummyNode; 180} 181 182void SelectionDAG::DeleteNodeIfDead(SDNode *N, void *NodeSet) { 183 if (!N->use_empty()) 184 return; 185 186 // Okay, we really are going to delete this node. First take this out of the 187 // appropriate CSE map. 188 switch (N->getOpcode()) { 189 case ISD::Constant: 190 Constants.erase(std::make_pair(cast<ConstantSDNode>(N)->getValue(), 191 N->getValueType(0))); 192 break; 193 case ISD::ConstantFP: 194 ConstantFPs.erase(std::make_pair(cast<ConstantFPSDNode>(N)->getValue(), 195 N->getValueType(0))); 196 break; 197 case ISD::GlobalAddress: 198 GlobalValues.erase(cast<GlobalAddressSDNode>(N)->getGlobal()); 199 break; 200 case ISD::FrameIndex: 201 FrameIndices.erase(cast<FrameIndexSDNode>(N)->getIndex()); 202 break; 203 case ISD::ConstantPool: 204 ConstantPoolIndices.erase(cast<ConstantPoolSDNode>(N)->getIndex()); 205 break; 206 case ISD::BasicBlock: 207 BBNodes.erase(cast<BasicBlockSDNode>(N)->getBasicBlock()); 208 break; 209 case ISD::ExternalSymbol: 210 ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 211 break; 212 213 case ISD::LOAD: 214 Loads.erase(std::make_pair(N->getOperand(1), 215 std::make_pair(N->getOperand(0), 216 N->getValueType(0)))); 217 break; 218 case ISD::SETCC: 219 SetCCs.erase(std::make_pair(std::make_pair(N->getOperand(0), 220 N->getOperand(1)), 221 cast<SetCCSDNode>(N)->getCondition())); 222 break; 223 case ISD::TRUNCSTORE: 224 case ISD::SIGN_EXTEND_INREG: 225 case ISD::ZERO_EXTEND_INREG: 226 case ISD::FP_ROUND_INREG: 227 case ISD::EXTLOAD: 228 case ISD::SEXTLOAD: 229 case ISD::ZEXTLOAD: { 230 EVTStruct NN; 231 NN.Opcode = ISD::TRUNCSTORE; 232 NN.VT = N->getValueType(0); 233 NN.EVT = cast<MVTSDNode>(N)->getExtraValueType(); 234 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 235 NN.Ops.push_back(N->getOperand(i)); 236 MVTSDNodes.erase(NN); 237 break; 238 } 239 default: 240 if (N->getNumOperands() == 1) 241 UnaryOps.erase(std::make_pair(N->getOpcode(), 242 std::make_pair(N->getOperand(0), 243 N->getValueType(0)))); 244 else if (N->getNumOperands() == 2) 245 BinaryOps.erase(std::make_pair(N->getOpcode(), 246 std::make_pair(N->getOperand(0), 247 N->getOperand(1)))); 248 break; 249 } 250 251 // Next, brutally remove the operand list. 252 while (!N->Operands.empty()) { 253 SDNode *O = N->Operands.back().Val; 254 N->Operands.pop_back(); 255 O->removeUser(N); 256 257 // Now that we removed this operand, see if there are no uses of it left. 258 DeleteNodeIfDead(O, NodeSet); 259 } 260 261 // Remove the node from the nodes set and delete it. 262 std::set<SDNode*> &AllNodeSet = *(std::set<SDNode*>*)NodeSet; 263 AllNodeSet.erase(N); 264 265 // Now that the node is gone, check to see if any of the operands of this node 266 // are dead now. 267 delete N; 268} 269 270 271SelectionDAG::~SelectionDAG() { 272 for (unsigned i = 0, e = AllNodes.size(); i != e; ++i) 273 delete AllNodes[i]; 274} 275 276SDOperand SelectionDAG::getConstant(uint64_t Val, MVT::ValueType VT) { 277 assert(MVT::isInteger(VT) && "Cannot create FP integer constant!"); 278 // Mask out any bits that are not valid for this constant. 279 if (VT != MVT::i64) 280 Val &= ((uint64_t)1 << MVT::getSizeInBits(VT)) - 1; 281 282 SDNode *&N = Constants[std::make_pair(Val, VT)]; 283 if (N) return SDOperand(N, 0); 284 N = new ConstantSDNode(Val, VT); 285 AllNodes.push_back(N); 286 return SDOperand(N, 0); 287} 288 289SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) { 290 assert(MVT::isFloatingPoint(VT) && "Cannot create integer FP constant!"); 291 if (VT == MVT::f32) 292 Val = (float)Val; // Mask out extra precision. 293 294 SDNode *&N = ConstantFPs[std::make_pair(Val, VT)]; 295 if (N) return SDOperand(N, 0); 296 N = new ConstantFPSDNode(Val, VT); 297 AllNodes.push_back(N); 298 return SDOperand(N, 0); 299} 300 301 302 303SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV, 304 MVT::ValueType VT) { 305 SDNode *&N = GlobalValues[GV]; 306 if (N) return SDOperand(N, 0); 307 N = new GlobalAddressSDNode(GV,VT); 308 AllNodes.push_back(N); 309 return SDOperand(N, 0); 310} 311 312SDOperand SelectionDAG::getFrameIndex(int FI, MVT::ValueType VT) { 313 SDNode *&N = FrameIndices[FI]; 314 if (N) return SDOperand(N, 0); 315 N = new FrameIndexSDNode(FI, VT); 316 AllNodes.push_back(N); 317 return SDOperand(N, 0); 318} 319 320SDOperand SelectionDAG::getConstantPool(unsigned CPIdx, MVT::ValueType VT) { 321 SDNode *N = ConstantPoolIndices[CPIdx]; 322 if (N) return SDOperand(N, 0); 323 N = new ConstantPoolSDNode(CPIdx, VT); 324 AllNodes.push_back(N); 325 return SDOperand(N, 0); 326} 327 328SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 329 SDNode *&N = BBNodes[MBB]; 330 if (N) return SDOperand(N, 0); 331 N = new BasicBlockSDNode(MBB); 332 AllNodes.push_back(N); 333 return SDOperand(N, 0); 334} 335 336SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT::ValueType VT) { 337 SDNode *&N = ExternalSymbols[Sym]; 338 if (N) return SDOperand(N, 0); 339 N = new ExternalSymbolSDNode(Sym, VT); 340 AllNodes.push_back(N); 341 return SDOperand(N, 0); 342} 343 344SDOperand SelectionDAG::getSetCC(ISD::CondCode Cond, SDOperand N1, 345 SDOperand N2) { 346 // These setcc operations always fold. 347 switch (Cond) { 348 default: break; 349 case ISD::SETFALSE: 350 case ISD::SETFALSE2: return getConstant(0, MVT::i1); 351 case ISD::SETTRUE: 352 case ISD::SETTRUE2: return getConstant(1, MVT::i1); 353 } 354 355 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) 356 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) { 357 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 358 359 // Sign extend the operands if required 360 if (ISD::isSignedIntSetCC(Cond)) { 361 C1 = N1C->getSignExtended(); 362 C2 = N2C->getSignExtended(); 363 } 364 365 switch (Cond) { 366 default: assert(0 && "Unknown integer setcc!"); 367 case ISD::SETEQ: return getConstant(C1 == C2, MVT::i1); 368 case ISD::SETNE: return getConstant(C1 != C2, MVT::i1); 369 case ISD::SETULT: return getConstant(C1 < C2, MVT::i1); 370 case ISD::SETUGT: return getConstant(C1 > C2, MVT::i1); 371 case ISD::SETULE: return getConstant(C1 <= C2, MVT::i1); 372 case ISD::SETUGE: return getConstant(C1 >= C2, MVT::i1); 373 case ISD::SETLT: return getConstant((int64_t)C1 < (int64_t)C2, MVT::i1); 374 case ISD::SETGT: return getConstant((int64_t)C1 > (int64_t)C2, MVT::i1); 375 case ISD::SETLE: return getConstant((int64_t)C1 <= (int64_t)C2, MVT::i1); 376 case ISD::SETGE: return getConstant((int64_t)C1 >= (int64_t)C2, MVT::i1); 377 } 378 } else { 379 // Ensure that the constant occurs on the RHS. 380 Cond = ISD::getSetCCSwappedOperands(Cond); 381 std::swap(N1, N2); 382 } 383 384 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) 385 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) { 386 double C1 = N1C->getValue(), C2 = N2C->getValue(); 387 388 switch (Cond) { 389 default: break; // FIXME: Implement the rest of these! 390 case ISD::SETEQ: return getConstant(C1 == C2, MVT::i1); 391 case ISD::SETNE: return getConstant(C1 != C2, MVT::i1); 392 case ISD::SETLT: return getConstant((int64_t)C1 < (int64_t)C2, MVT::i1); 393 case ISD::SETGT: return getConstant((int64_t)C1 < (int64_t)C2, MVT::i1); 394 case ISD::SETLE: return getConstant((int64_t)C1 < (int64_t)C2, MVT::i1); 395 case ISD::SETGE: return getConstant((int64_t)C1 < (int64_t)C2, MVT::i1); 396 } 397 } else { 398 // Ensure that the constant occurs on the RHS. 399 Cond = ISD::getSetCCSwappedOperands(Cond); 400 std::swap(N1, N2); 401 } 402 403 if (N1 == N2) { 404 // We can always fold X == Y for integer setcc's. 405 if (MVT::isInteger(N1.getValueType())) 406 return getConstant(ISD::isTrueWhenEqual(Cond), MVT::i1); 407 unsigned UOF = ISD::getUnorderedFlavor(Cond); 408 if (UOF == 2) // FP operators that are undefined on NaNs. 409 return getConstant(ISD::isTrueWhenEqual(Cond), MVT::i1); 410 if (UOF == ISD::isTrueWhenEqual(Cond)) 411 return getConstant(UOF, MVT::i1); 412 // Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO 413 // if it is not already. 414 Cond = UOF == 0 ? ISD::SETUO : ISD::SETO; 415 } 416 417 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) && 418 MVT::isInteger(N1.getValueType())) { 419 if (N1.getOpcode() == ISD::ADD || N1.getOpcode() == ISD::SUB || 420 N1.getOpcode() == ISD::XOR) { 421 // Simplify (X+Y) == (X+Z) --> Y == Z 422 if (N1.getOpcode() == N2.getOpcode()) { 423 if (N1.getOperand(0) == N2.getOperand(0)) 424 return getSetCC(Cond, N1.getOperand(1), N2.getOperand(1)); 425 if (N1.getOperand(1) == N2.getOperand(1)) 426 return getSetCC(Cond, N1.getOperand(0), N2.getOperand(0)); 427 if (isCommutativeBinOp(N1.getOpcode())) { 428 // If X op Y == Y op X, try other combinations. 429 if (N1.getOperand(0) == N2.getOperand(1)) 430 return getSetCC(Cond, N1.getOperand(1), N2.getOperand(0)); 431 if (N1.getOperand(1) == N2.getOperand(0)) 432 return getSetCC(Cond, N1.getOperand(1), N2.getOperand(1)); 433 } 434 } 435 436 // Simplify (X+Z) == X --> Z == 0 437 if (N1.getOperand(0) == N2) 438 return getSetCC(Cond, N1.getOperand(1), 439 getConstant(0, N1.getValueType())); 440 if (N1.getOperand(1) == N2) { 441 if (isCommutativeBinOp(N1.getOpcode())) 442 return getSetCC(Cond, N1.getOperand(0), 443 getConstant(0, N1.getValueType())); 444 else { 445 assert(N1.getOpcode() == ISD::SUB && "Unexpected operation!"); 446 // (Z-X) == X --> Z == X<<1 447 return getSetCC(Cond, N1.getOperand(0), 448 getNode(ISD::SHL, N2.getValueType(), 449 N2, getConstant(1, MVT::i8))); 450 } 451 } 452 } 453 454 if (N2.getOpcode() == ISD::ADD || N2.getOpcode() == ISD::SUB || 455 N2.getOpcode() == ISD::XOR) { 456 // Simplify X == (X+Z) --> Z == 0 457 if (N2.getOperand(0) == N1) 458 return getSetCC(Cond, N2.getOperand(1), 459 getConstant(0, N2.getValueType())); 460 else if (N2.getOperand(1) == N1) 461 return getSetCC(Cond, N2.getOperand(0), 462 getConstant(0, N2.getValueType())); 463 } 464 } 465 466 SetCCSDNode *&N = SetCCs[std::make_pair(std::make_pair(N1, N2), Cond)]; 467 if (N) return SDOperand(N, 0); 468 N = new SetCCSDNode(Cond, N1, N2); 469 AllNodes.push_back(N); 470 return SDOperand(N, 0); 471} 472 473 474 475/// getNode - Gets or creates the specified node. 476/// 477SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT) { 478 SDNode *N = new SDNode(Opcode, VT); 479 AllNodes.push_back(N); 480 return SDOperand(N, 0); 481} 482 483static const Type *getTypeFor(MVT::ValueType VT) { 484 switch (VT) { 485 default: assert(0 && "Unknown MVT!"); 486 case MVT::i1: return Type::BoolTy; 487 case MVT::i8: return Type::UByteTy; 488 case MVT::i16: return Type::UShortTy; 489 case MVT::i32: return Type::UIntTy; 490 case MVT::i64: return Type::ULongTy; 491 case MVT::f32: return Type::FloatTy; 492 case MVT::f64: return Type::DoubleTy; 493 } 494} 495 496SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 497 SDOperand Operand) { 498 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) { 499 uint64_t Val = C->getValue(); 500 switch (Opcode) { 501 default: break; 502 case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT); 503 case ISD::ZERO_EXTEND: return getConstant(Val, VT); 504 case ISD::TRUNCATE: return getConstant(Val, VT); 505 case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT); 506 case ISD::UINT_TO_FP: return getConstantFP(C->getValue(), VT); 507 } 508 } 509 510 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) 511 switch (Opcode) { 512 case ISD::FP_ROUND: 513 case ISD::FP_EXTEND: 514 return getConstantFP(C->getValue(), VT); 515 case ISD::FP_TO_SINT: 516 return getConstant((int64_t)C->getValue(), VT); 517 case ISD::FP_TO_UINT: 518 return getConstant((uint64_t)C->getValue(), VT); 519 } 520 521 unsigned OpOpcode = Operand.Val->getOpcode(); 522 switch (Opcode) { 523 case ISD::SIGN_EXTEND: 524 if (Operand.getValueType() == VT) return Operand; // noop extension 525 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 526 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 527 break; 528 case ISD::ZERO_EXTEND: 529 if (Operand.getValueType() == VT) return Operand; // noop extension 530 if (OpOpcode == ISD::ZERO_EXTEND) 531 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0)); 532 break; 533 case ISD::TRUNCATE: 534 if (Operand.getValueType() == VT) return Operand; // noop truncate 535 if (OpOpcode == ISD::TRUNCATE) 536 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 537 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) { 538 // If the source is smaller than the dest, we still need an extend. 539 if (Operand.Val->getOperand(0).getValueType() < VT) 540 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 541 else if (Operand.Val->getOperand(0).getValueType() > VT) 542 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 543 else 544 return Operand.Val->getOperand(0); 545 } 546 break; 547 } 548 549 SDNode *&N = UnaryOps[std::make_pair(Opcode, std::make_pair(Operand, VT))]; 550 if (N) return SDOperand(N, 0); 551 N = new SDNode(Opcode, Operand); 552 N->setValueTypes(VT); 553 AllNodes.push_back(N); 554 return SDOperand(N, 0); 555} 556 557SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 558 SDOperand N1, SDOperand N2) { 559 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 560 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 561 if (N1C) { 562 if (N2C) { 563 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 564 switch (Opcode) { 565 case ISD::ADD: return getConstant(C1 + C2, VT); 566 case ISD::SUB: return getConstant(C1 - C2, VT); 567 case ISD::MUL: return getConstant(C1 * C2, VT); 568 case ISD::UDIV: 569 if (C2) return getConstant(C1 / C2, VT); 570 break; 571 case ISD::UREM : 572 if (C2) return getConstant(C1 % C2, VT); 573 break; 574 case ISD::SDIV : 575 if (C2) return getConstant(N1C->getSignExtended() / 576 N2C->getSignExtended(), VT); 577 break; 578 case ISD::SREM : 579 if (C2) return getConstant(N1C->getSignExtended() % 580 N2C->getSignExtended(), VT); 581 break; 582 case ISD::AND : return getConstant(C1 & C2, VT); 583 case ISD::OR : return getConstant(C1 | C2, VT); 584 case ISD::XOR : return getConstant(C1 ^ C2, VT); 585 case ISD::SHL : return getConstant(C1 << (int)C2, VT); 586 case ISD::SRL : return getConstant(C1 >> (unsigned)C2, VT); 587 case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT); 588 default: break; 589 } 590 591 } else { // Cannonicalize constant to RHS if commutative 592 if (isCommutativeBinOp(Opcode)) { 593 std::swap(N1C, N2C); 594 std::swap(N1, N2); 595 } 596 } 597 } 598 599 if (N2C) { 600 uint64_t C2 = N2C->getValue(); 601 602 switch (Opcode) { 603 case ISD::ADD: 604 if (!C2) return N1; // add X, 0 -> X 605 break; 606 case ISD::SUB: 607 if (!C2) return N1; // sub X, 0 -> X 608 break; 609 case ISD::MUL: 610 if (!C2) return N2; // mul X, 0 -> 0 611 if (N2C->isAllOnesValue()) // mul X, -1 -> 0-X 612 return getNode(ISD::SUB, VT, getConstant(0, VT), N1); 613 614 // FIXME: This should only be done if the target supports shift 615 // operations. 616 if ((C2 & C2-1) == 0) { 617 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 618 return getNode(ISD::SHL, VT, N1, ShAmt); 619 } 620 break; 621 622 case ISD::UDIV: 623 // FIXME: This should only be done if the target supports shift 624 // operations. 625 if ((C2 & C2-1) == 0 && C2) { 626 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 627 return getNode(ISD::SRL, VT, N1, ShAmt); 628 } 629 break; 630 631 case ISD::SHL: 632 case ISD::SRL: 633 case ISD::SRA: 634 if (C2 == 0) return N1; 635 break; 636 637 case ISD::AND: 638 if (!C2) return N2; // X and 0 -> 0 639 if (N2C->isAllOnesValue()) 640 return N1; // X and -1 -> X 641 break; 642 case ISD::OR: 643 if (!C2)return N1; // X or 0 -> X 644 if (N2C->isAllOnesValue()) 645 return N2; // X or -1 -> -1 646 break; 647 case ISD::XOR: 648 if (!C2) return N1; // X xor 0 -> X 649 if (N2C->isAllOnesValue()) { 650 if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(N1.Val)){ 651 // !(X op Y) -> (X !op Y) 652 bool isInteger = MVT::isInteger(SetCC->getOperand(0).getValueType()); 653 return getSetCC(ISD::getSetCCInverse(SetCC->getCondition(),isInteger), 654 SetCC->getOperand(0), SetCC->getOperand(1)); 655 } else if (N1.getOpcode() == ISD::AND || N1.getOpcode() == ISD::OR) { 656 SDNode *Op = N1.Val; 657 // !(X or Y) -> (!X and !Y) iff X or Y are freely invertible 658 // !(X and Y) -> (!X or !Y) iff X or Y are freely invertible 659 SDOperand LHS = Op->getOperand(0), RHS = Op->getOperand(1); 660 if (isInvertibleForFree(RHS) || isInvertibleForFree(LHS)) { 661 LHS = getNode(ISD::XOR, VT, LHS, N2); // RHS = ~LHS 662 RHS = getNode(ISD::XOR, VT, RHS, N2); // RHS = ~RHS 663 if (Op->getOpcode() == ISD::AND) 664 return getNode(ISD::OR, VT, LHS, RHS); 665 return getNode(ISD::AND, VT, LHS, RHS); 666 } 667 } 668 // X xor -1 -> not(x) ? 669 } 670 break; 671 } 672 673 // Reassociate ((X op C1) op C2) if possible. 674 if (N1.getOpcode() == Opcode && isAssociativeBinOp(Opcode)) 675 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N1.Val->getOperand(1))) 676 return getNode(Opcode, VT, N1.Val->getOperand(0), 677 getNode(Opcode, VT, N2, N1.Val->getOperand(1))); 678 } 679 680 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val); 681 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val); 682 if (N1CFP) 683 if (N2CFP) { 684 double C1 = N1CFP->getValue(), C2 = N2CFP->getValue(); 685 switch (Opcode) { 686 case ISD::ADD: return getConstantFP(C1 + C2, VT); 687 case ISD::SUB: return getConstantFP(C1 - C2, VT); 688 case ISD::MUL: return getConstantFP(C1 * C2, VT); 689 case ISD::SDIV: 690 if (C2) return getConstantFP(C1 / C2, VT); 691 break; 692 case ISD::SREM : 693 if (C2) return getConstantFP(fmod(C1, C2), VT); 694 break; 695 default: break; 696 } 697 698 } else { // Cannonicalize constant to RHS if commutative 699 if (isCommutativeBinOp(Opcode)) { 700 std::swap(N1CFP, N2CFP); 701 std::swap(N1, N2); 702 } 703 } 704 705 // Finally, fold operations that do not require constants. 706 switch (Opcode) { 707 case ISD::AND: 708 case ISD::OR: 709 if (SetCCSDNode *LHS = dyn_cast<SetCCSDNode>(N1.Val)) 710 if (SetCCSDNode *RHS = dyn_cast<SetCCSDNode>(N2.Val)) { 711 SDOperand LL = LHS->getOperand(0), RL = RHS->getOperand(0); 712 SDOperand LR = LHS->getOperand(1), RR = RHS->getOperand(1); 713 ISD::CondCode Op2 = RHS->getCondition(); 714 715 // (X op1 Y) | (Y op2 X) -> (X op1 Y) | (X swapop2 Y) 716 if (LL == RR && LR == RL) { 717 Op2 = ISD::getSetCCSwappedOperands(Op2); 718 goto MatchedBackwards; 719 } 720 721 if (LL == RL && LR == RR) { 722 MatchedBackwards: 723 ISD::CondCode Result; 724 bool isInteger = MVT::isInteger(LL.getValueType()); 725 if (Opcode == ISD::OR) 726 Result = ISD::getSetCCOrOperation(LHS->getCondition(), Op2, 727 isInteger); 728 else 729 Result = ISD::getSetCCAndOperation(LHS->getCondition(), Op2, 730 isInteger); 731 if (Result != ISD::SETCC_INVALID) 732 return getSetCC(Result, LL, LR); 733 } 734 } 735 break; 736 case ISD::XOR: 737 if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 738 break; 739 case ISD::SUB: 740 if (N1.getOpcode() == ISD::ADD) { 741 if (N1.Val->getOperand(0) == N2) 742 return N1.Val->getOperand(1); // (A+B)-A == B 743 if (N1.Val->getOperand(1) == N2) 744 return N1.Val->getOperand(0); // (A+B)-B == A 745 } 746 break; 747 } 748 749 SDNode *&N = BinaryOps[std::make_pair(Opcode, std::make_pair(N1, N2))]; 750 if (N) return SDOperand(N, 0); 751 N = new SDNode(Opcode, N1, N2); 752 N->setValueTypes(VT); 753 754 AllNodes.push_back(N); 755 return SDOperand(N, 0); 756} 757 758SDOperand SelectionDAG::getLoad(MVT::ValueType VT, 759 SDOperand Chain, SDOperand Ptr) { 760 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, VT))]; 761 if (N) return SDOperand(N, 0); 762 N = new SDNode(ISD::LOAD, Chain, Ptr); 763 764 // Loads have a token chain. 765 N->setValueTypes(VT, MVT::Other); 766 AllNodes.push_back(N); 767 return SDOperand(N, 0); 768} 769 770 771SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 772 SDOperand N1, SDOperand N2, SDOperand N3) { 773 // Perform various simplifications. 774 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 775 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 776 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.Val); 777 switch (Opcode) { 778 case ISD::SELECT: 779 if (N1C) 780 if (N1C->getValue()) 781 return N2; // select true, X, Y -> X 782 else 783 return N3; // select false, X, Y -> Y 784 785 if (N2 == N3) return N2; // select C, X, X -> X 786 787 if (VT == MVT::i1) { // Boolean SELECT 788 if (N2C) { 789 if (N3C) { 790 if (N2C->getValue()) // select C, 1, 0 -> C 791 return N1; 792 return getNode(ISD::XOR, VT, N1, N3); // select C, 0, 1 -> ~C 793 } 794 795 if (N2C->getValue()) // select C, 1, X -> C | X 796 return getNode(ISD::OR, VT, N1, N3); 797 else // select C, 0, X -> ~C & X 798 return getNode(ISD::AND, VT, 799 getNode(ISD::XOR, N1.getValueType(), N1, 800 getConstant(1, N1.getValueType())), N3); 801 } else if (N3C) { 802 if (N3C->getValue()) // select C, X, 1 -> ~C | X 803 return getNode(ISD::OR, VT, 804 getNode(ISD::XOR, N1.getValueType(), N1, 805 getConstant(1, N1.getValueType())), N2); 806 else // select C, X, 0 -> C & X 807 return getNode(ISD::AND, VT, N1, N2); 808 } 809 } 810 811 break; 812 case ISD::BRCOND: 813 if (N2C) 814 if (N2C->getValue()) // Unconditional branch 815 return getNode(ISD::BR, MVT::Other, N1, N3); 816 else 817 return N1; // Never-taken branch 818 break; 819 } 820 821 SDNode *N = new SDNode(Opcode, N1, N2, N3); 822 switch (Opcode) { 823 default: 824 N->setValueTypes(VT); 825 break; 826 case ISD::DYNAMIC_STACKALLOC: // DYNAMIC_STACKALLOC produces pointer and chain 827 N->setValueTypes(VT, MVT::Other); 828 break; 829 } 830 831 // FIXME: memoize NODES 832 AllNodes.push_back(N); 833 return SDOperand(N, 0); 834} 835 836SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 837 std::vector<SDOperand> &Children) { 838 switch (Children.size()) { 839 case 0: return getNode(Opcode, VT); 840 case 1: return getNode(Opcode, VT, Children[0]); 841 case 2: return getNode(Opcode, VT, Children[0], Children[1]); 842 case 3: return getNode(Opcode, VT, Children[0], Children[1], Children[2]); 843 default: 844 // FIXME: MEMOIZE!! 845 SDNode *N = new SDNode(Opcode, Children); 846 N->setValueTypes(VT); 847 AllNodes.push_back(N); 848 return SDOperand(N, 0); 849 } 850} 851 852SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 853 MVT::ValueType EVT) { 854 855 switch (Opcode) { 856 default: assert(0 && "Bad opcode for this accessor!"); 857 case ISD::FP_ROUND_INREG: 858 assert(VT == N1.getValueType() && "Not an inreg round!"); 859 assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) && 860 "Cannot FP_ROUND_INREG integer types"); 861 if (EVT == VT) return N1; // Not actually rounding 862 assert(EVT < VT && "Not rounding down!"); 863 break; 864 case ISD::ZERO_EXTEND_INREG: 865 case ISD::SIGN_EXTEND_INREG: 866 assert(VT == N1.getValueType() && "Not an inreg extend!"); 867 assert(MVT::isInteger(VT) && MVT::isInteger(EVT) && 868 "Cannot *_EXTEND_INREG FP types"); 869 if (EVT == VT) return N1; // Not actually extending 870 assert(EVT < VT && "Not extending!"); 871 break; 872 } 873 874 EVTStruct NN; 875 NN.Opcode = Opcode; 876 NN.VT = VT; 877 NN.EVT = EVT; 878 NN.Ops.push_back(N1); 879 880 SDNode *&N = MVTSDNodes[NN]; 881 if (N) return SDOperand(N, 0); 882 N = new MVTSDNode(Opcode, VT, N1, EVT); 883 AllNodes.push_back(N); 884 return SDOperand(N, 0); 885} 886 887SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 888 SDOperand N2, MVT::ValueType EVT) { 889 switch (Opcode) { 890 default: assert(0 && "Bad opcode for this accessor!"); 891 case ISD::EXTLOAD: 892 case ISD::SEXTLOAD: 893 case ISD::ZEXTLOAD: 894 // If they are asking for an extending loat from/to the same thing, return a 895 // normal load. 896 if (VT == EVT) 897 return getNode(ISD::LOAD, VT, N1, N2); 898 assert(EVT < VT && "Should only be an extending load, not truncating!"); 899 assert((Opcode == ISD::EXTLOAD || MVT::isInteger(VT)) && 900 "Cannot sign/zero extend a FP load!"); 901 assert(MVT::isInteger(VT) == MVT::isInteger(EVT) && 902 "Cannot convert from FP to Int or Int -> FP!"); 903 break; 904 } 905 906 EVTStruct NN; 907 NN.Opcode = Opcode; 908 NN.VT = VT; 909 NN.EVT = EVT; 910 NN.Ops.push_back(N1); 911 NN.Ops.push_back(N2); 912 913 SDNode *&N = MVTSDNodes[NN]; 914 if (N) return SDOperand(N, 0); 915 N = new MVTSDNode(Opcode, VT, MVT::Other, N1, N2, EVT); 916 AllNodes.push_back(N); 917 return SDOperand(N, 0); 918} 919 920SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 921 SDOperand N2, SDOperand N3, MVT::ValueType EVT) { 922 switch (Opcode) { 923 default: assert(0 && "Bad opcode for this accessor!"); 924 case ISD::TRUNCSTORE: 925#if 0 // FIXME: If the target supports EVT natively, convert to a truncate/store 926 // If this is a truncating store of a constant, convert to the desired type 927 // and store it instead. 928 if (isa<Constant>(N1)) { 929 SDOperand Op = getNode(ISD::TRUNCATE, EVT, N1); 930 if (isa<Constant>(Op)) 931 N1 = Op; 932 } 933 // Also for ConstantFP? 934#endif 935 if (N1.getValueType() == EVT) // Normal store? 936 return getNode(ISD::STORE, VT, N1, N2, N3); 937 assert(N2.getValueType() > EVT && "Not a truncation?"); 938 assert(MVT::isInteger(N2.getValueType()) == MVT::isInteger(EVT) && 939 "Can't do FP-INT conversion!"); 940 break; 941 } 942 943 EVTStruct NN; 944 NN.Opcode = Opcode; 945 NN.VT = VT; 946 NN.EVT = EVT; 947 NN.Ops.push_back(N1); 948 NN.Ops.push_back(N2); 949 NN.Ops.push_back(N3); 950 951 SDNode *&N = MVTSDNodes[NN]; 952 if (N) return SDOperand(N, 0); 953 N = new MVTSDNode(Opcode, VT, N1, N2, N3, EVT); 954 AllNodes.push_back(N); 955 return SDOperand(N, 0); 956} 957 958 959/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 960/// indicated value. This method ignores uses of other values defined by this 961/// operation. 962bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) { 963 assert(Value < getNumValues() && "Bad value!"); 964 965 // If there is only one value, this is easy. 966 if (getNumValues() == 1) 967 return use_size() == NUses; 968 if (Uses.size() < NUses) return false; 969 970 SDOperand TheValue(this, Value); 971 972 std::set<SDNode*> UsersHandled; 973 974 for (std::vector<SDNode*>::iterator UI = Uses.begin(), E = Uses.end(); 975 UI != E; ++UI) { 976 SDNode *User = *UI; 977 if (User->getNumOperands() == 1 || 978 UsersHandled.insert(User).second) // First time we've seen this? 979 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) 980 if (User->getOperand(i) == TheValue) { 981 if (NUses == 0) 982 return false; // too many uses 983 --NUses; 984 } 985 } 986 987 // Found exactly the right number of uses? 988 return NUses == 0; 989} 990 991 992const char *SDNode::getOperationName() const { 993 switch (getOpcode()) { 994 default: return "<<Unknown>>"; 995 case ISD::EntryToken: return "EntryToken"; 996 case ISD::TokenFactor: return "TokenFactor"; 997 case ISD::Constant: return "Constant"; 998 case ISD::ConstantFP: return "ConstantFP"; 999 case ISD::GlobalAddress: return "GlobalAddress"; 1000 case ISD::FrameIndex: return "FrameIndex"; 1001 case ISD::BasicBlock: return "BasicBlock"; 1002 case ISD::ExternalSymbol: return "ExternalSymbol"; 1003 case ISD::ConstantPool: return "ConstantPoolIndex"; 1004 case ISD::CopyToReg: return "CopyToReg"; 1005 case ISD::CopyFromReg: return "CopyFromReg"; 1006 case ISD::ImplicitDef: return "ImplicitDef"; 1007 1008 case ISD::ADD: return "add"; 1009 case ISD::SUB: return "sub"; 1010 case ISD::MUL: return "mul"; 1011 case ISD::SDIV: return "sdiv"; 1012 case ISD::UDIV: return "udiv"; 1013 case ISD::SREM: return "srem"; 1014 case ISD::UREM: return "urem"; 1015 case ISD::AND: return "and"; 1016 case ISD::OR: return "or"; 1017 case ISD::XOR: return "xor"; 1018 case ISD::SHL: return "shl"; 1019 case ISD::SRA: return "sra"; 1020 case ISD::SRL: return "srl"; 1021 1022 case ISD::SELECT: return "select"; 1023 case ISD::ADDC: return "addc"; 1024 case ISD::SUBB: return "subb"; 1025 1026 // Conversion operators. 1027 case ISD::SIGN_EXTEND: return "sign_extend"; 1028 case ISD::ZERO_EXTEND: return "zero_extend"; 1029 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 1030 case ISD::ZERO_EXTEND_INREG: return "zero_extend_inreg"; 1031 case ISD::TRUNCATE: return "truncate"; 1032 case ISD::FP_ROUND: return "fp_round"; 1033 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 1034 case ISD::FP_EXTEND: return "fp_extend"; 1035 1036 case ISD::SINT_TO_FP: return "sint_to_fp"; 1037 case ISD::UINT_TO_FP: return "uint_to_fp"; 1038 case ISD::FP_TO_SINT: return "fp_to_sint"; 1039 case ISD::FP_TO_UINT: return "fp_to_uint"; 1040 1041 // Control flow instructions 1042 case ISD::BR: return "br"; 1043 case ISD::BRCOND: return "brcond"; 1044 case ISD::RET: return "ret"; 1045 case ISD::CALL: return "call"; 1046 case ISD::ADJCALLSTACKDOWN: return "adjcallstackdown"; 1047 case ISD::ADJCALLSTACKUP: return "adjcallstackup"; 1048 1049 // Other operators 1050 case ISD::LOAD: return "load"; 1051 case ISD::STORE: return "store"; 1052 case ISD::EXTLOAD: return "extload"; 1053 case ISD::SEXTLOAD: return "sextload"; 1054 case ISD::ZEXTLOAD: return "zextload"; 1055 case ISD::TRUNCSTORE: return "truncstore"; 1056 1057 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 1058 case ISD::EXTRACT_ELEMENT: return "extract_element"; 1059 case ISD::BUILD_PAIR: return "build_pair"; 1060 case ISD::MEMSET: return "memset"; 1061 case ISD::MEMCPY: return "memcpy"; 1062 case ISD::MEMMOVE: return "memmove"; 1063 1064 case ISD::SETCC: 1065 const SetCCSDNode *SetCC = cast<SetCCSDNode>(this); 1066 switch (SetCC->getCondition()) { 1067 default: assert(0 && "Unknown setcc condition!"); 1068 case ISD::SETOEQ: return "setcc:setoeq"; 1069 case ISD::SETOGT: return "setcc:setogt"; 1070 case ISD::SETOGE: return "setcc:setoge"; 1071 case ISD::SETOLT: return "setcc:setolt"; 1072 case ISD::SETOLE: return "setcc:setole"; 1073 case ISD::SETONE: return "setcc:setone"; 1074 1075 case ISD::SETO: return "setcc:seto"; 1076 case ISD::SETUO: return "setcc:setuo"; 1077 case ISD::SETUEQ: return "setcc:setue"; 1078 case ISD::SETUGT: return "setcc:setugt"; 1079 case ISD::SETUGE: return "setcc:setuge"; 1080 case ISD::SETULT: return "setcc:setult"; 1081 case ISD::SETULE: return "setcc:setule"; 1082 case ISD::SETUNE: return "setcc:setune"; 1083 1084 case ISD::SETEQ: return "setcc:seteq"; 1085 case ISD::SETGT: return "setcc:setgt"; 1086 case ISD::SETGE: return "setcc:setge"; 1087 case ISD::SETLT: return "setcc:setlt"; 1088 case ISD::SETLE: return "setcc:setle"; 1089 case ISD::SETNE: return "setcc:setne"; 1090 } 1091 } 1092} 1093 1094void SDNode::dump() const { 1095 std::cerr << (void*)this << ": "; 1096 1097 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 1098 if (i) std::cerr << ","; 1099 switch (getValueType(i)) { 1100 default: assert(0 && "Unknown value type!"); 1101 case MVT::i1: std::cerr << "i1"; break; 1102 case MVT::i8: std::cerr << "i8"; break; 1103 case MVT::i16: std::cerr << "i16"; break; 1104 case MVT::i32: std::cerr << "i32"; break; 1105 case MVT::i64: std::cerr << "i64"; break; 1106 case MVT::f32: std::cerr << "f32"; break; 1107 case MVT::f64: std::cerr << "f64"; break; 1108 case MVT::Other: std::cerr << "ch"; break; 1109 } 1110 } 1111 std::cerr << " = " << getOperationName(); 1112 1113 std::cerr << " "; 1114 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1115 if (i) std::cerr << ", "; 1116 std::cerr << (void*)getOperand(i).Val; 1117 if (unsigned RN = getOperand(i).ResNo) 1118 std::cerr << ":" << RN; 1119 } 1120 1121 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 1122 std::cerr << "<" << CSDN->getValue() << ">"; 1123 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 1124 std::cerr << "<" << CSDN->getValue() << ">"; 1125 } else if (const GlobalAddressSDNode *GADN = 1126 dyn_cast<GlobalAddressSDNode>(this)) { 1127 std::cerr << "<"; 1128 WriteAsOperand(std::cerr, GADN->getGlobal()) << ">"; 1129 } else if (const FrameIndexSDNode *FIDN = 1130 dyn_cast<FrameIndexSDNode>(this)) { 1131 std::cerr << "<" << FIDN->getIndex() << ">"; 1132 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 1133 std::cerr << "<" << CP->getIndex() << ">"; 1134 } else if (const BasicBlockSDNode *BBDN = 1135 dyn_cast<BasicBlockSDNode>(this)) { 1136 std::cerr << "<"; 1137 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 1138 if (LBB) 1139 std::cerr << LBB->getName() << " "; 1140 std::cerr << (const void*)BBDN->getBasicBlock() << ">"; 1141 } else if (const RegSDNode *C2V = dyn_cast<RegSDNode>(this)) { 1142 std::cerr << "<reg #" << C2V->getReg() << ">"; 1143 } else if (const ExternalSymbolSDNode *ES = 1144 dyn_cast<ExternalSymbolSDNode>(this)) { 1145 std::cerr << "'" << ES->getSymbol() << "'"; 1146 } 1147} 1148 1149static void DumpNodes(SDNode *N, unsigned indent) { 1150 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 1151 if (N->getOperand(i).Val->hasOneUse()) 1152 DumpNodes(N->getOperand(i).Val, indent+2); 1153 else 1154 std::cerr << "\n" << std::string(indent+2, ' ') 1155 << (void*)N->getOperand(i).Val << ": <multiple use>"; 1156 1157 1158 std::cerr << "\n" << std::string(indent, ' '); 1159 N->dump(); 1160} 1161 1162void SelectionDAG::dump() const { 1163 std::cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 1164 std::vector<SDNode*> Nodes(AllNodes); 1165 std::sort(Nodes.begin(), Nodes.end()); 1166 1167 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 1168 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val) 1169 DumpNodes(Nodes[i], 2); 1170 } 1171 1172 DumpNodes(getRoot().Val, 2); 1173 1174 std::cerr << "\n\n"; 1175} 1176 1177