SelectionDAG.cpp revision 950aa3ca2c60863510bee45ec1b9180f975b8e79
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 483SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 484 SDOperand Operand) { 485 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) { 486 uint64_t Val = C->getValue(); 487 switch (Opcode) { 488 default: break; 489 case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT); 490 case ISD::ZERO_EXTEND: return getConstant(Val, VT); 491 case ISD::TRUNCATE: return getConstant(Val, VT); 492 case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT); 493 case ISD::UINT_TO_FP: return getConstantFP(C->getValue(), VT); 494 } 495 } 496 497 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) 498 switch (Opcode) { 499 case ISD::FP_ROUND: 500 case ISD::FP_EXTEND: 501 return getConstantFP(C->getValue(), VT); 502 case ISD::FP_TO_SINT: 503 return getConstant((int64_t)C->getValue(), VT); 504 case ISD::FP_TO_UINT: 505 return getConstant((uint64_t)C->getValue(), VT); 506 } 507 508 unsigned OpOpcode = Operand.Val->getOpcode(); 509 switch (Opcode) { 510 case ISD::SIGN_EXTEND: 511 if (Operand.getValueType() == VT) return Operand; // noop extension 512 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 513 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 514 break; 515 case ISD::ZERO_EXTEND: 516 if (Operand.getValueType() == VT) return Operand; // noop extension 517 if (OpOpcode == ISD::ZERO_EXTEND) 518 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0)); 519 break; 520 case ISD::TRUNCATE: 521 if (Operand.getValueType() == VT) return Operand; // noop truncate 522 if (OpOpcode == ISD::TRUNCATE) 523 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 524 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) { 525 // If the source is smaller than the dest, we still need an extend. 526 if (Operand.Val->getOperand(0).getValueType() < VT) 527 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 528 else if (Operand.Val->getOperand(0).getValueType() > VT) 529 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 530 else 531 return Operand.Val->getOperand(0); 532 } 533 break; 534 } 535 536 SDNode *&N = UnaryOps[std::make_pair(Opcode, std::make_pair(Operand, VT))]; 537 if (N) return SDOperand(N, 0); 538 N = new SDNode(Opcode, Operand); 539 N->setValueTypes(VT); 540 AllNodes.push_back(N); 541 return SDOperand(N, 0); 542} 543 544SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 545 SDOperand N1, SDOperand N2) { 546 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 547 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 548 if (N1C) { 549 if (N2C) { 550 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 551 switch (Opcode) { 552 case ISD::ADD: return getConstant(C1 + C2, VT); 553 case ISD::SUB: return getConstant(C1 - C2, VT); 554 case ISD::MUL: return getConstant(C1 * C2, VT); 555 case ISD::UDIV: 556 if (C2) return getConstant(C1 / C2, VT); 557 break; 558 case ISD::UREM : 559 if (C2) return getConstant(C1 % C2, VT); 560 break; 561 case ISD::SDIV : 562 if (C2) return getConstant(N1C->getSignExtended() / 563 N2C->getSignExtended(), VT); 564 break; 565 case ISD::SREM : 566 if (C2) return getConstant(N1C->getSignExtended() % 567 N2C->getSignExtended(), VT); 568 break; 569 case ISD::AND : return getConstant(C1 & C2, VT); 570 case ISD::OR : return getConstant(C1 | C2, VT); 571 case ISD::XOR : return getConstant(C1 ^ C2, VT); 572 case ISD::SHL : return getConstant(C1 << (int)C2, VT); 573 case ISD::SRL : return getConstant(C1 >> (unsigned)C2, VT); 574 case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT); 575 default: break; 576 } 577 578 } else { // Cannonicalize constant to RHS if commutative 579 if (isCommutativeBinOp(Opcode)) { 580 std::swap(N1C, N2C); 581 std::swap(N1, N2); 582 } 583 } 584 } 585 586 if (N2C) { 587 uint64_t C2 = N2C->getValue(); 588 589 switch (Opcode) { 590 case ISD::ADD: 591 if (!C2) return N1; // add X, 0 -> X 592 break; 593 case ISD::SUB: 594 if (!C2) return N1; // sub X, 0 -> X 595 break; 596 case ISD::MUL: 597 if (!C2) return N2; // mul X, 0 -> 0 598 if (N2C->isAllOnesValue()) // mul X, -1 -> 0-X 599 return getNode(ISD::SUB, VT, getConstant(0, VT), N1); 600 601 // FIXME: This should only be done if the target supports shift 602 // operations. 603 if ((C2 & C2-1) == 0) { 604 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 605 return getNode(ISD::SHL, VT, N1, ShAmt); 606 } 607 break; 608 609 case ISD::UDIV: 610 // FIXME: This should only be done if the target supports shift 611 // operations. 612 if ((C2 & C2-1) == 0 && C2) { 613 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 614 return getNode(ISD::SRL, VT, N1, ShAmt); 615 } 616 break; 617 618 case ISD::SHL: 619 case ISD::SRL: 620 case ISD::SRA: 621 if (C2 == 0) return N1; 622 break; 623 624 case ISD::AND: 625 if (!C2) return N2; // X and 0 -> 0 626 if (N2C->isAllOnesValue()) 627 return N1; // X and -1 -> X 628 break; 629 case ISD::OR: 630 if (!C2)return N1; // X or 0 -> X 631 if (N2C->isAllOnesValue()) 632 return N2; // X or -1 -> -1 633 break; 634 case ISD::XOR: 635 if (!C2) return N1; // X xor 0 -> X 636 if (N2C->isAllOnesValue()) { 637 if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(N1.Val)){ 638 // !(X op Y) -> (X !op Y) 639 bool isInteger = MVT::isInteger(SetCC->getOperand(0).getValueType()); 640 return getSetCC(ISD::getSetCCInverse(SetCC->getCondition(),isInteger), 641 SetCC->getOperand(0), SetCC->getOperand(1)); 642 } else if (N1.getOpcode() == ISD::AND || N1.getOpcode() == ISD::OR) { 643 SDNode *Op = N1.Val; 644 // !(X or Y) -> (!X and !Y) iff X or Y are freely invertible 645 // !(X and Y) -> (!X or !Y) iff X or Y are freely invertible 646 SDOperand LHS = Op->getOperand(0), RHS = Op->getOperand(1); 647 if (isInvertibleForFree(RHS) || isInvertibleForFree(LHS)) { 648 LHS = getNode(ISD::XOR, VT, LHS, N2); // RHS = ~LHS 649 RHS = getNode(ISD::XOR, VT, RHS, N2); // RHS = ~RHS 650 if (Op->getOpcode() == ISD::AND) 651 return getNode(ISD::OR, VT, LHS, RHS); 652 return getNode(ISD::AND, VT, LHS, RHS); 653 } 654 } 655 // X xor -1 -> not(x) ? 656 } 657 break; 658 } 659 660 // Reassociate ((X op C1) op C2) if possible. 661 if (N1.getOpcode() == Opcode && isAssociativeBinOp(Opcode)) 662 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N1.Val->getOperand(1))) 663 return getNode(Opcode, VT, N1.Val->getOperand(0), 664 getNode(Opcode, VT, N2, N1.Val->getOperand(1))); 665 } 666 667 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val); 668 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val); 669 if (N1CFP) 670 if (N2CFP) { 671 double C1 = N1CFP->getValue(), C2 = N2CFP->getValue(); 672 switch (Opcode) { 673 case ISD::ADD: return getConstantFP(C1 + C2, VT); 674 case ISD::SUB: return getConstantFP(C1 - C2, VT); 675 case ISD::MUL: return getConstantFP(C1 * C2, VT); 676 case ISD::SDIV: 677 if (C2) return getConstantFP(C1 / C2, VT); 678 break; 679 case ISD::SREM : 680 if (C2) return getConstantFP(fmod(C1, C2), VT); 681 break; 682 default: break; 683 } 684 685 } else { // Cannonicalize constant to RHS if commutative 686 if (isCommutativeBinOp(Opcode)) { 687 std::swap(N1CFP, N2CFP); 688 std::swap(N1, N2); 689 } 690 } 691 692 // Finally, fold operations that do not require constants. 693 switch (Opcode) { 694 case ISD::AND: 695 case ISD::OR: 696 if (SetCCSDNode *LHS = dyn_cast<SetCCSDNode>(N1.Val)) 697 if (SetCCSDNode *RHS = dyn_cast<SetCCSDNode>(N2.Val)) { 698 SDOperand LL = LHS->getOperand(0), RL = RHS->getOperand(0); 699 SDOperand LR = LHS->getOperand(1), RR = RHS->getOperand(1); 700 ISD::CondCode Op2 = RHS->getCondition(); 701 702 // (X op1 Y) | (Y op2 X) -> (X op1 Y) | (X swapop2 Y) 703 if (LL == RR && LR == RL) { 704 Op2 = ISD::getSetCCSwappedOperands(Op2); 705 goto MatchedBackwards; 706 } 707 708 if (LL == RL && LR == RR) { 709 MatchedBackwards: 710 ISD::CondCode Result; 711 bool isInteger = MVT::isInteger(LL.getValueType()); 712 if (Opcode == ISD::OR) 713 Result = ISD::getSetCCOrOperation(LHS->getCondition(), Op2, 714 isInteger); 715 else 716 Result = ISD::getSetCCAndOperation(LHS->getCondition(), Op2, 717 isInteger); 718 if (Result != ISD::SETCC_INVALID) 719 return getSetCC(Result, LL, LR); 720 } 721 } 722 break; 723 case ISD::XOR: 724 if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 725 break; 726 case ISD::SUB: 727 if (N1.getOpcode() == ISD::ADD) { 728 if (N1.Val->getOperand(0) == N2) 729 return N1.Val->getOperand(1); // (A+B)-A == B 730 if (N1.Val->getOperand(1) == N2) 731 return N1.Val->getOperand(0); // (A+B)-B == A 732 } 733 break; 734 } 735 736 SDNode *&N = BinaryOps[std::make_pair(Opcode, std::make_pair(N1, N2))]; 737 if (N) return SDOperand(N, 0); 738 N = new SDNode(Opcode, N1, N2); 739 N->setValueTypes(VT); 740 741 AllNodes.push_back(N); 742 return SDOperand(N, 0); 743} 744 745SDOperand SelectionDAG::getLoad(MVT::ValueType VT, 746 SDOperand Chain, SDOperand Ptr) { 747 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, VT))]; 748 if (N) return SDOperand(N, 0); 749 N = new SDNode(ISD::LOAD, Chain, Ptr); 750 751 // Loads have a token chain. 752 N->setValueTypes(VT, MVT::Other); 753 AllNodes.push_back(N); 754 return SDOperand(N, 0); 755} 756 757 758SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 759 SDOperand N1, SDOperand N2, SDOperand N3) { 760 // Perform various simplifications. 761 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 762 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 763 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.Val); 764 switch (Opcode) { 765 case ISD::SELECT: 766 if (N1C) 767 if (N1C->getValue()) 768 return N2; // select true, X, Y -> X 769 else 770 return N3; // select false, X, Y -> Y 771 772 if (N2 == N3) return N2; // select C, X, X -> X 773 774 if (VT == MVT::i1) { // Boolean SELECT 775 if (N2C) { 776 if (N3C) { 777 if (N2C->getValue()) // select C, 1, 0 -> C 778 return N1; 779 return getNode(ISD::XOR, VT, N1, N3); // select C, 0, 1 -> ~C 780 } 781 782 if (N2C->getValue()) // select C, 1, X -> C | X 783 return getNode(ISD::OR, VT, N1, N3); 784 else // select C, 0, X -> ~C & X 785 return getNode(ISD::AND, VT, 786 getNode(ISD::XOR, N1.getValueType(), N1, 787 getConstant(1, N1.getValueType())), N3); 788 } else if (N3C) { 789 if (N3C->getValue()) // select C, X, 1 -> ~C | X 790 return getNode(ISD::OR, VT, 791 getNode(ISD::XOR, N1.getValueType(), N1, 792 getConstant(1, N1.getValueType())), N2); 793 else // select C, X, 0 -> C & X 794 return getNode(ISD::AND, VT, N1, N2); 795 } 796 } 797 798 break; 799 case ISD::BRCOND: 800 if (N2C) 801 if (N2C->getValue()) // Unconditional branch 802 return getNode(ISD::BR, MVT::Other, N1, N3); 803 else 804 return N1; // Never-taken branch 805 break; 806 } 807 808 SDNode *N = new SDNode(Opcode, N1, N2, N3); 809 switch (Opcode) { 810 default: 811 N->setValueTypes(VT); 812 break; 813 case ISD::DYNAMIC_STACKALLOC: // DYNAMIC_STACKALLOC produces pointer and chain 814 N->setValueTypes(VT, MVT::Other); 815 break; 816 } 817 818 // FIXME: memoize NODES 819 AllNodes.push_back(N); 820 return SDOperand(N, 0); 821} 822 823SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 824 std::vector<SDOperand> &Children) { 825 switch (Children.size()) { 826 case 0: return getNode(Opcode, VT); 827 case 1: return getNode(Opcode, VT, Children[0]); 828 case 2: return getNode(Opcode, VT, Children[0], Children[1]); 829 case 3: return getNode(Opcode, VT, Children[0], Children[1], Children[2]); 830 default: 831 // FIXME: MEMOIZE!! 832 SDNode *N = new SDNode(Opcode, Children); 833 N->setValueTypes(VT); 834 AllNodes.push_back(N); 835 return SDOperand(N, 0); 836 } 837} 838 839SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 840 MVT::ValueType EVT) { 841 842 switch (Opcode) { 843 default: assert(0 && "Bad opcode for this accessor!"); 844 case ISD::FP_ROUND_INREG: 845 assert(VT == N1.getValueType() && "Not an inreg round!"); 846 assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) && 847 "Cannot FP_ROUND_INREG integer types"); 848 if (EVT == VT) return N1; // Not actually rounding 849 assert(EVT < VT && "Not rounding down!"); 850 break; 851 case ISD::ZERO_EXTEND_INREG: 852 case ISD::SIGN_EXTEND_INREG: 853 assert(VT == N1.getValueType() && "Not an inreg extend!"); 854 assert(MVT::isInteger(VT) && MVT::isInteger(EVT) && 855 "Cannot *_EXTEND_INREG FP types"); 856 if (EVT == VT) return N1; // Not actually extending 857 assert(EVT < VT && "Not extending!"); 858 859 // If we are sign extending an extension, use the original source. 860 if (N1.getOpcode() == ISD::ZERO_EXTEND_INREG || 861 N1.getOpcode() == ISD::SIGN_EXTEND_INREG) { 862 if (N1.getOpcode() == Opcode && 863 cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) 864 return N1; 865 } 866 867 break; 868 } 869 870 EVTStruct NN; 871 NN.Opcode = Opcode; 872 NN.VT = VT; 873 NN.EVT = EVT; 874 NN.Ops.push_back(N1); 875 876 SDNode *&N = MVTSDNodes[NN]; 877 if (N) return SDOperand(N, 0); 878 N = new MVTSDNode(Opcode, VT, N1, EVT); 879 AllNodes.push_back(N); 880 return SDOperand(N, 0); 881} 882 883SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 884 SDOperand N2, MVT::ValueType EVT) { 885 switch (Opcode) { 886 default: assert(0 && "Bad opcode for this accessor!"); 887 case ISD::EXTLOAD: 888 case ISD::SEXTLOAD: 889 case ISD::ZEXTLOAD: 890 // If they are asking for an extending loat from/to the same thing, return a 891 // normal load. 892 if (VT == EVT) 893 return getNode(ISD::LOAD, VT, N1, N2); 894 assert(EVT < VT && "Should only be an extending load, not truncating!"); 895 assert((Opcode == ISD::EXTLOAD || MVT::isInteger(VT)) && 896 "Cannot sign/zero extend a FP load!"); 897 assert(MVT::isInteger(VT) == MVT::isInteger(EVT) && 898 "Cannot convert from FP to Int or Int -> FP!"); 899 break; 900 } 901 902 EVTStruct NN; 903 NN.Opcode = Opcode; 904 NN.VT = VT; 905 NN.EVT = EVT; 906 NN.Ops.push_back(N1); 907 NN.Ops.push_back(N2); 908 909 SDNode *&N = MVTSDNodes[NN]; 910 if (N) return SDOperand(N, 0); 911 N = new MVTSDNode(Opcode, VT, MVT::Other, N1, N2, EVT); 912 AllNodes.push_back(N); 913 return SDOperand(N, 0); 914} 915 916SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 917 SDOperand N2, SDOperand N3, MVT::ValueType EVT) { 918 switch (Opcode) { 919 default: assert(0 && "Bad opcode for this accessor!"); 920 case ISD::TRUNCSTORE: 921#if 0 // FIXME: If the target supports EVT natively, convert to a truncate/store 922 // If this is a truncating store of a constant, convert to the desired type 923 // and store it instead. 924 if (isa<Constant>(N1)) { 925 SDOperand Op = getNode(ISD::TRUNCATE, EVT, N1); 926 if (isa<Constant>(Op)) 927 N1 = Op; 928 } 929 // Also for ConstantFP? 930#endif 931 if (N1.getValueType() == EVT) // Normal store? 932 return getNode(ISD::STORE, VT, N1, N2, N3); 933 assert(N2.getValueType() > EVT && "Not a truncation?"); 934 assert(MVT::isInteger(N2.getValueType()) == MVT::isInteger(EVT) && 935 "Can't do FP-INT conversion!"); 936 break; 937 } 938 939 EVTStruct NN; 940 NN.Opcode = Opcode; 941 NN.VT = VT; 942 NN.EVT = EVT; 943 NN.Ops.push_back(N1); 944 NN.Ops.push_back(N2); 945 NN.Ops.push_back(N3); 946 947 SDNode *&N = MVTSDNodes[NN]; 948 if (N) return SDOperand(N, 0); 949 N = new MVTSDNode(Opcode, VT, N1, N2, N3, EVT); 950 AllNodes.push_back(N); 951 return SDOperand(N, 0); 952} 953 954 955/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 956/// indicated value. This method ignores uses of other values defined by this 957/// operation. 958bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) { 959 assert(Value < getNumValues() && "Bad value!"); 960 961 // If there is only one value, this is easy. 962 if (getNumValues() == 1) 963 return use_size() == NUses; 964 if (Uses.size() < NUses) return false; 965 966 SDOperand TheValue(this, Value); 967 968 std::set<SDNode*> UsersHandled; 969 970 for (std::vector<SDNode*>::iterator UI = Uses.begin(), E = Uses.end(); 971 UI != E; ++UI) { 972 SDNode *User = *UI; 973 if (User->getNumOperands() == 1 || 974 UsersHandled.insert(User).second) // First time we've seen this? 975 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) 976 if (User->getOperand(i) == TheValue) { 977 if (NUses == 0) 978 return false; // too many uses 979 --NUses; 980 } 981 } 982 983 // Found exactly the right number of uses? 984 return NUses == 0; 985} 986 987 988const char *SDNode::getOperationName() const { 989 switch (getOpcode()) { 990 default: return "<<Unknown>>"; 991 case ISD::EntryToken: return "EntryToken"; 992 case ISD::TokenFactor: return "TokenFactor"; 993 case ISD::Constant: return "Constant"; 994 case ISD::ConstantFP: return "ConstantFP"; 995 case ISD::GlobalAddress: return "GlobalAddress"; 996 case ISD::FrameIndex: return "FrameIndex"; 997 case ISD::BasicBlock: return "BasicBlock"; 998 case ISD::ExternalSymbol: return "ExternalSymbol"; 999 case ISD::ConstantPool: return "ConstantPoolIndex"; 1000 case ISD::CopyToReg: return "CopyToReg"; 1001 case ISD::CopyFromReg: return "CopyFromReg"; 1002 case ISD::ImplicitDef: return "ImplicitDef"; 1003 1004 case ISD::ADD: return "add"; 1005 case ISD::SUB: return "sub"; 1006 case ISD::MUL: return "mul"; 1007 case ISD::SDIV: return "sdiv"; 1008 case ISD::UDIV: return "udiv"; 1009 case ISD::SREM: return "srem"; 1010 case ISD::UREM: return "urem"; 1011 case ISD::AND: return "and"; 1012 case ISD::OR: return "or"; 1013 case ISD::XOR: return "xor"; 1014 case ISD::SHL: return "shl"; 1015 case ISD::SRA: return "sra"; 1016 case ISD::SRL: return "srl"; 1017 1018 case ISD::SELECT: return "select"; 1019 case ISD::ADDC: return "addc"; 1020 case ISD::SUBB: return "subb"; 1021 1022 // Conversion operators. 1023 case ISD::SIGN_EXTEND: return "sign_extend"; 1024 case ISD::ZERO_EXTEND: return "zero_extend"; 1025 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 1026 case ISD::ZERO_EXTEND_INREG: return "zero_extend_inreg"; 1027 case ISD::TRUNCATE: return "truncate"; 1028 case ISD::FP_ROUND: return "fp_round"; 1029 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 1030 case ISD::FP_EXTEND: return "fp_extend"; 1031 1032 case ISD::SINT_TO_FP: return "sint_to_fp"; 1033 case ISD::UINT_TO_FP: return "uint_to_fp"; 1034 case ISD::FP_TO_SINT: return "fp_to_sint"; 1035 case ISD::FP_TO_UINT: return "fp_to_uint"; 1036 1037 // Control flow instructions 1038 case ISD::BR: return "br"; 1039 case ISD::BRCOND: return "brcond"; 1040 case ISD::RET: return "ret"; 1041 case ISD::CALL: return "call"; 1042 case ISD::ADJCALLSTACKDOWN: return "adjcallstackdown"; 1043 case ISD::ADJCALLSTACKUP: return "adjcallstackup"; 1044 1045 // Other operators 1046 case ISD::LOAD: return "load"; 1047 case ISD::STORE: return "store"; 1048 case ISD::EXTLOAD: return "extload"; 1049 case ISD::SEXTLOAD: return "sextload"; 1050 case ISD::ZEXTLOAD: return "zextload"; 1051 case ISD::TRUNCSTORE: return "truncstore"; 1052 1053 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 1054 case ISD::EXTRACT_ELEMENT: return "extract_element"; 1055 case ISD::BUILD_PAIR: return "build_pair"; 1056 case ISD::MEMSET: return "memset"; 1057 case ISD::MEMCPY: return "memcpy"; 1058 case ISD::MEMMOVE: return "memmove"; 1059 1060 case ISD::SETCC: 1061 const SetCCSDNode *SetCC = cast<SetCCSDNode>(this); 1062 switch (SetCC->getCondition()) { 1063 default: assert(0 && "Unknown setcc condition!"); 1064 case ISD::SETOEQ: return "setcc:setoeq"; 1065 case ISD::SETOGT: return "setcc:setogt"; 1066 case ISD::SETOGE: return "setcc:setoge"; 1067 case ISD::SETOLT: return "setcc:setolt"; 1068 case ISD::SETOLE: return "setcc:setole"; 1069 case ISD::SETONE: return "setcc:setone"; 1070 1071 case ISD::SETO: return "setcc:seto"; 1072 case ISD::SETUO: return "setcc:setuo"; 1073 case ISD::SETUEQ: return "setcc:setue"; 1074 case ISD::SETUGT: return "setcc:setugt"; 1075 case ISD::SETUGE: return "setcc:setuge"; 1076 case ISD::SETULT: return "setcc:setult"; 1077 case ISD::SETULE: return "setcc:setule"; 1078 case ISD::SETUNE: return "setcc:setune"; 1079 1080 case ISD::SETEQ: return "setcc:seteq"; 1081 case ISD::SETGT: return "setcc:setgt"; 1082 case ISD::SETGE: return "setcc:setge"; 1083 case ISD::SETLT: return "setcc:setlt"; 1084 case ISD::SETLE: return "setcc:setle"; 1085 case ISD::SETNE: return "setcc:setne"; 1086 } 1087 } 1088} 1089 1090void SDNode::dump() const { 1091 std::cerr << (void*)this << ": "; 1092 1093 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 1094 if (i) std::cerr << ","; 1095 if (getValueType(i) == MVT::Other) 1096 std::cerr << "ch"; 1097 else 1098 std::cerr << MVT::getValueTypeString(getValueType(i)); 1099 } 1100 std::cerr << " = " << getOperationName(); 1101 1102 std::cerr << " "; 1103 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1104 if (i) std::cerr << ", "; 1105 std::cerr << (void*)getOperand(i).Val; 1106 if (unsigned RN = getOperand(i).ResNo) 1107 std::cerr << ":" << RN; 1108 } 1109 1110 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 1111 std::cerr << "<" << CSDN->getValue() << ">"; 1112 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 1113 std::cerr << "<" << CSDN->getValue() << ">"; 1114 } else if (const GlobalAddressSDNode *GADN = 1115 dyn_cast<GlobalAddressSDNode>(this)) { 1116 std::cerr << "<"; 1117 WriteAsOperand(std::cerr, GADN->getGlobal()) << ">"; 1118 } else if (const FrameIndexSDNode *FIDN = 1119 dyn_cast<FrameIndexSDNode>(this)) { 1120 std::cerr << "<" << FIDN->getIndex() << ">"; 1121 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 1122 std::cerr << "<" << CP->getIndex() << ">"; 1123 } else if (const BasicBlockSDNode *BBDN = 1124 dyn_cast<BasicBlockSDNode>(this)) { 1125 std::cerr << "<"; 1126 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 1127 if (LBB) 1128 std::cerr << LBB->getName() << " "; 1129 std::cerr << (const void*)BBDN->getBasicBlock() << ">"; 1130 } else if (const RegSDNode *C2V = dyn_cast<RegSDNode>(this)) { 1131 std::cerr << "<reg #" << C2V->getReg() << ">"; 1132 } else if (const ExternalSymbolSDNode *ES = 1133 dyn_cast<ExternalSymbolSDNode>(this)) { 1134 std::cerr << "'" << ES->getSymbol() << "'"; 1135 } else if (const MVTSDNode *M = dyn_cast<MVTSDNode>(this)) { 1136 std::cerr << " - Ty = " << MVT::getValueTypeString(M->getExtraValueType()); 1137 } 1138} 1139 1140static void DumpNodes(SDNode *N, unsigned indent) { 1141 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 1142 if (N->getOperand(i).Val->hasOneUse()) 1143 DumpNodes(N->getOperand(i).Val, indent+2); 1144 else 1145 std::cerr << "\n" << std::string(indent+2, ' ') 1146 << (void*)N->getOperand(i).Val << ": <multiple use>"; 1147 1148 1149 std::cerr << "\n" << std::string(indent, ' '); 1150 N->dump(); 1151} 1152 1153void SelectionDAG::dump() const { 1154 std::cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 1155 std::vector<SDNode*> Nodes(AllNodes); 1156 std::sort(Nodes.begin(), Nodes.end()); 1157 1158 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 1159 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val) 1160 DumpNodes(Nodes[i], 2); 1161 } 1162 1163 DumpNodes(getRoot().Val, 2); 1164 1165 std::cerr << "\n\n"; 1166} 1167 1168