SelectionDAG.cpp revision 4a9b4f1943c6c56c749c8709ed28680408afc577
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 std::make_pair( 222 cast<SetCCSDNode>(N)->getCondition(), 223 N->getValueType(0)))); 224 break; 225 case ISD::TRUNCSTORE: 226 case ISD::SIGN_EXTEND_INREG: 227 case ISD::ZERO_EXTEND_INREG: 228 case ISD::FP_ROUND_INREG: 229 case ISD::EXTLOAD: 230 case ISD::SEXTLOAD: 231 case ISD::ZEXTLOAD: { 232 EVTStruct NN; 233 NN.Opcode = ISD::TRUNCSTORE; 234 NN.VT = N->getValueType(0); 235 NN.EVT = cast<MVTSDNode>(N)->getExtraValueType(); 236 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 237 NN.Ops.push_back(N->getOperand(i)); 238 MVTSDNodes.erase(NN); 239 break; 240 } 241 default: 242 if (N->getNumOperands() == 1) 243 UnaryOps.erase(std::make_pair(N->getOpcode(), 244 std::make_pair(N->getOperand(0), 245 N->getValueType(0)))); 246 else if (N->getNumOperands() == 2) 247 BinaryOps.erase(std::make_pair(N->getOpcode(), 248 std::make_pair(N->getOperand(0), 249 N->getOperand(1)))); 250 break; 251 } 252 253 // Next, brutally remove the operand list. 254 while (!N->Operands.empty()) { 255 SDNode *O = N->Operands.back().Val; 256 N->Operands.pop_back(); 257 O->removeUser(N); 258 259 // Now that we removed this operand, see if there are no uses of it left. 260 DeleteNodeIfDead(O, NodeSet); 261 } 262 263 // Remove the node from the nodes set and delete it. 264 std::set<SDNode*> &AllNodeSet = *(std::set<SDNode*>*)NodeSet; 265 AllNodeSet.erase(N); 266 267 // Now that the node is gone, check to see if any of the operands of this node 268 // are dead now. 269 delete N; 270} 271 272 273SelectionDAG::~SelectionDAG() { 274 for (unsigned i = 0, e = AllNodes.size(); i != e; ++i) 275 delete AllNodes[i]; 276} 277 278SDOperand SelectionDAG::getConstant(uint64_t Val, MVT::ValueType VT) { 279 assert(MVT::isInteger(VT) && "Cannot create FP integer constant!"); 280 // Mask out any bits that are not valid for this constant. 281 if (VT != MVT::i64) 282 Val &= ((uint64_t)1 << MVT::getSizeInBits(VT)) - 1; 283 284 SDNode *&N = Constants[std::make_pair(Val, VT)]; 285 if (N) return SDOperand(N, 0); 286 N = new ConstantSDNode(Val, VT); 287 AllNodes.push_back(N); 288 return SDOperand(N, 0); 289} 290 291SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) { 292 assert(MVT::isFloatingPoint(VT) && "Cannot create integer FP constant!"); 293 if (VT == MVT::f32) 294 Val = (float)Val; // Mask out extra precision. 295 296 SDNode *&N = ConstantFPs[std::make_pair(Val, VT)]; 297 if (N) return SDOperand(N, 0); 298 N = new ConstantFPSDNode(Val, VT); 299 AllNodes.push_back(N); 300 return SDOperand(N, 0); 301} 302 303 304 305SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV, 306 MVT::ValueType VT) { 307 SDNode *&N = GlobalValues[GV]; 308 if (N) return SDOperand(N, 0); 309 N = new GlobalAddressSDNode(GV,VT); 310 AllNodes.push_back(N); 311 return SDOperand(N, 0); 312} 313 314SDOperand SelectionDAG::getFrameIndex(int FI, MVT::ValueType VT) { 315 SDNode *&N = FrameIndices[FI]; 316 if (N) return SDOperand(N, 0); 317 N = new FrameIndexSDNode(FI, VT); 318 AllNodes.push_back(N); 319 return SDOperand(N, 0); 320} 321 322SDOperand SelectionDAG::getConstantPool(unsigned CPIdx, MVT::ValueType VT) { 323 SDNode *N = ConstantPoolIndices[CPIdx]; 324 if (N) return SDOperand(N, 0); 325 N = new ConstantPoolSDNode(CPIdx, VT); 326 AllNodes.push_back(N); 327 return SDOperand(N, 0); 328} 329 330SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 331 SDNode *&N = BBNodes[MBB]; 332 if (N) return SDOperand(N, 0); 333 N = new BasicBlockSDNode(MBB); 334 AllNodes.push_back(N); 335 return SDOperand(N, 0); 336} 337 338SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT::ValueType VT) { 339 SDNode *&N = ExternalSymbols[Sym]; 340 if (N) return SDOperand(N, 0); 341 N = new ExternalSymbolSDNode(Sym, VT); 342 AllNodes.push_back(N); 343 return SDOperand(N, 0); 344} 345 346SDOperand SelectionDAG::getSetCC(ISD::CondCode Cond, MVT::ValueType VT, 347 SDOperand N1, SDOperand N2) { 348 // These setcc operations always fold. 349 switch (Cond) { 350 default: break; 351 case ISD::SETFALSE: 352 case ISD::SETFALSE2: return getConstant(0, VT); 353 case ISD::SETTRUE: 354 case ISD::SETTRUE2: return getConstant(1, VT); 355 } 356 357 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) 358 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) { 359 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 360 361 // Sign extend the operands if required 362 if (ISD::isSignedIntSetCC(Cond)) { 363 C1 = N1C->getSignExtended(); 364 C2 = N2C->getSignExtended(); 365 } 366 367 switch (Cond) { 368 default: assert(0 && "Unknown integer setcc!"); 369 case ISD::SETEQ: return getConstant(C1 == C2, VT); 370 case ISD::SETNE: return getConstant(C1 != C2, VT); 371 case ISD::SETULT: return getConstant(C1 < C2, VT); 372 case ISD::SETUGT: return getConstant(C1 > C2, VT); 373 case ISD::SETULE: return getConstant(C1 <= C2, VT); 374 case ISD::SETUGE: return getConstant(C1 >= C2, VT); 375 case ISD::SETLT: return getConstant((int64_t)C1 < (int64_t)C2, VT); 376 case ISD::SETGT: return getConstant((int64_t)C1 > (int64_t)C2, VT); 377 case ISD::SETLE: return getConstant((int64_t)C1 <= (int64_t)C2, VT); 378 case ISD::SETGE: return getConstant((int64_t)C1 >= (int64_t)C2, VT); 379 } 380 } else { 381 // Ensure that the constant occurs on the RHS. 382 Cond = ISD::getSetCCSwappedOperands(Cond); 383 std::swap(N1, N2); 384 } 385 386 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) 387 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) { 388 double C1 = N1C->getValue(), C2 = N2C->getValue(); 389 390 switch (Cond) { 391 default: break; // FIXME: Implement the rest of these! 392 case ISD::SETEQ: return getConstant(C1 == C2, VT); 393 case ISD::SETNE: return getConstant(C1 != C2, VT); 394 case ISD::SETLT: return getConstant(C1 < C2, VT); 395 case ISD::SETGT: return getConstant(C1 > C2, VT); 396 case ISD::SETLE: return getConstant(C1 <= C2, VT); 397 case ISD::SETGE: return getConstant(C1 >= C2, VT); 398 } 399 } else { 400 // Ensure that the constant occurs on the RHS. 401 Cond = ISD::getSetCCSwappedOperands(Cond); 402 std::swap(N1, N2); 403 } 404 405 if (N1 == N2) { 406 // We can always fold X == Y for integer setcc's. 407 if (MVT::isInteger(N1.getValueType())) 408 return getConstant(ISD::isTrueWhenEqual(Cond), VT); 409 unsigned UOF = ISD::getUnorderedFlavor(Cond); 410 if (UOF == 2) // FP operators that are undefined on NaNs. 411 return getConstant(ISD::isTrueWhenEqual(Cond), VT); 412 if (UOF == ISD::isTrueWhenEqual(Cond)) 413 return getConstant(UOF, VT); 414 // Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO 415 // if it is not already. 416 Cond = UOF == 0 ? ISD::SETUO : ISD::SETO; 417 } 418 419 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) && 420 MVT::isInteger(N1.getValueType())) { 421 if (N1.getOpcode() == ISD::ADD || N1.getOpcode() == ISD::SUB || 422 N1.getOpcode() == ISD::XOR) { 423 // Simplify (X+Y) == (X+Z) --> Y == Z 424 if (N1.getOpcode() == N2.getOpcode()) { 425 if (N1.getOperand(0) == N2.getOperand(0)) 426 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(1)); 427 if (N1.getOperand(1) == N2.getOperand(1)) 428 return getSetCC(Cond, VT, N1.getOperand(0), N2.getOperand(0)); 429 if (isCommutativeBinOp(N1.getOpcode())) { 430 // If X op Y == Y op X, try other combinations. 431 if (N1.getOperand(0) == N2.getOperand(1)) 432 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(0)); 433 if (N1.getOperand(1) == N2.getOperand(0)) 434 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(1)); 435 } 436 } 437 438 // Simplify (X+Z) == X --> Z == 0 439 if (N1.getOperand(0) == N2) 440 return getSetCC(Cond, VT, N1.getOperand(1), 441 getConstant(0, N1.getValueType())); 442 if (N1.getOperand(1) == N2) { 443 if (isCommutativeBinOp(N1.getOpcode())) 444 return getSetCC(Cond, VT, N1.getOperand(0), 445 getConstant(0, N1.getValueType())); 446 else { 447 assert(N1.getOpcode() == ISD::SUB && "Unexpected operation!"); 448 // (Z-X) == X --> Z == X<<1 449 return getSetCC(Cond, VT, N1.getOperand(0), 450 getNode(ISD::SHL, N2.getValueType(), 451 N2, getConstant(1, MVT::i8))); 452 } 453 } 454 } 455 456 if (N2.getOpcode() == ISD::ADD || N2.getOpcode() == ISD::SUB || 457 N2.getOpcode() == ISD::XOR) { 458 // Simplify X == (X+Z) --> Z == 0 459 if (N2.getOperand(0) == N1) 460 return getSetCC(Cond, VT, N2.getOperand(1), 461 getConstant(0, N2.getValueType())); 462 else if (N2.getOperand(1) == N1) 463 return getSetCC(Cond, VT, N2.getOperand(0), 464 getConstant(0, N2.getValueType())); 465 } 466 } 467 468 SetCCSDNode *&N = SetCCs[std::make_pair(std::make_pair(N1, N2), 469 std::make_pair(Cond, VT))]; 470 if (N) return SDOperand(N, 0); 471 N = new SetCCSDNode(Cond, N1, N2); 472 N->setValueTypes(VT); 473 AllNodes.push_back(N); 474 return SDOperand(N, 0); 475} 476 477 478 479/// getNode - Gets or creates the specified node. 480/// 481SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT) { 482 SDNode *N = new SDNode(Opcode, VT); 483 AllNodes.push_back(N); 484 return SDOperand(N, 0); 485} 486 487SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 488 SDOperand Operand) { 489 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) { 490 uint64_t Val = C->getValue(); 491 switch (Opcode) { 492 default: break; 493 case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT); 494 case ISD::ZERO_EXTEND: return getConstant(Val, VT); 495 case ISD::TRUNCATE: return getConstant(Val, VT); 496 case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT); 497 case ISD::UINT_TO_FP: return getConstantFP(C->getValue(), VT); 498 } 499 } 500 501 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) 502 switch (Opcode) { 503 case ISD::FP_ROUND: 504 case ISD::FP_EXTEND: 505 return getConstantFP(C->getValue(), VT); 506 case ISD::FP_TO_SINT: 507 return getConstant((int64_t)C->getValue(), VT); 508 case ISD::FP_TO_UINT: 509 return getConstant((uint64_t)C->getValue(), VT); 510 } 511 512 unsigned OpOpcode = Operand.Val->getOpcode(); 513 switch (Opcode) { 514 case ISD::SIGN_EXTEND: 515 if (Operand.getValueType() == VT) return Operand; // noop extension 516 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 517 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 518 break; 519 case ISD::ZERO_EXTEND: 520 if (Operand.getValueType() == VT) return Operand; // noop extension 521 if (OpOpcode == ISD::ZERO_EXTEND) 522 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0)); 523 break; 524 case ISD::TRUNCATE: 525 if (Operand.getValueType() == VT) return Operand; // noop truncate 526 if (OpOpcode == ISD::TRUNCATE) 527 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 528 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) { 529 // If the source is smaller than the dest, we still need an extend. 530 if (Operand.Val->getOperand(0).getValueType() < VT) 531 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 532 else if (Operand.Val->getOperand(0).getValueType() > VT) 533 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 534 else 535 return Operand.Val->getOperand(0); 536 } 537 break; 538 } 539 540 SDNode *&N = UnaryOps[std::make_pair(Opcode, std::make_pair(Operand, VT))]; 541 if (N) return SDOperand(N, 0); 542 N = new SDNode(Opcode, Operand); 543 N->setValueTypes(VT); 544 AllNodes.push_back(N); 545 return SDOperand(N, 0); 546} 547 548SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 549 SDOperand N1, SDOperand N2) { 550#ifndef NDEBUG 551 switch (Opcode) { 552 case ISD::AND: 553 case ISD::OR: 554 case ISD::XOR: 555 case ISD::UDIV: 556 case ISD::UREM: 557 assert(MVT::isInteger(VT) && "This operator does not apply to FP types!"); 558 // fall through 559 case ISD::ADD: 560 case ISD::SUB: 561 case ISD::MUL: 562 case ISD::SDIV: 563 case ISD::SREM: 564 assert(N1.getValueType() == N2.getValueType() && 565 N1.getValueType() == VT && "Binary operator types must match!"); 566 break; 567 568 case ISD::SHL: 569 case ISD::SRA: 570 case ISD::SRL: 571 assert(VT == N1.getValueType() && 572 "Shift operators return type must be the same as their first arg"); 573 assert(MVT::isInteger(VT) && MVT::isInteger(N2.getValueType()) && 574 VT != MVT::i1 && "Shifts only work on integers"); 575 break; 576 default: break; 577 } 578#endif 579 580 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 581 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 582 if (N1C) { 583 if (N2C) { 584 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 585 switch (Opcode) { 586 case ISD::ADD: return getConstant(C1 + C2, VT); 587 case ISD::SUB: return getConstant(C1 - C2, VT); 588 case ISD::MUL: return getConstant(C1 * C2, VT); 589 case ISD::UDIV: 590 if (C2) return getConstant(C1 / C2, VT); 591 break; 592 case ISD::UREM : 593 if (C2) return getConstant(C1 % C2, VT); 594 break; 595 case ISD::SDIV : 596 if (C2) return getConstant(N1C->getSignExtended() / 597 N2C->getSignExtended(), VT); 598 break; 599 case ISD::SREM : 600 if (C2) return getConstant(N1C->getSignExtended() % 601 N2C->getSignExtended(), VT); 602 break; 603 case ISD::AND : return getConstant(C1 & C2, VT); 604 case ISD::OR : return getConstant(C1 | C2, VT); 605 case ISD::XOR : return getConstant(C1 ^ C2, VT); 606 case ISD::SHL : return getConstant(C1 << (int)C2, VT); 607 case ISD::SRL : return getConstant(C1 >> (unsigned)C2, VT); 608 case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT); 609 default: break; 610 } 611 612 } else { // Cannonicalize constant to RHS if commutative 613 if (isCommutativeBinOp(Opcode)) { 614 std::swap(N1C, N2C); 615 std::swap(N1, N2); 616 } 617 } 618 } 619 620 if (N2C) { 621 uint64_t C2 = N2C->getValue(); 622 623 switch (Opcode) { 624 case ISD::ADD: 625 if (!C2) return N1; // add X, 0 -> X 626 break; 627 case ISD::SUB: 628 if (!C2) return N1; // sub X, 0 -> X 629 break; 630 case ISD::MUL: 631 if (!C2) return N2; // mul X, 0 -> 0 632 if (N2C->isAllOnesValue()) // mul X, -1 -> 0-X 633 return getNode(ISD::SUB, VT, getConstant(0, VT), N1); 634 635 // FIXME: This should only be done if the target supports shift 636 // operations. 637 if ((C2 & C2-1) == 0) { 638 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 639 return getNode(ISD::SHL, VT, N1, ShAmt); 640 } 641 break; 642 643 case ISD::UDIV: 644 // FIXME: This should only be done if the target supports shift 645 // operations. 646 if ((C2 & C2-1) == 0 && C2) { 647 SDOperand ShAmt = getConstant(ExactLog2(C2), MVT::i8); 648 return getNode(ISD::SRL, VT, N1, ShAmt); 649 } 650 break; 651 652 case ISD::SHL: 653 case ISD::SRL: 654 case ISD::SRA: 655 if (C2 == 0) return N1; 656 break; 657 658 case ISD::AND: 659 if (!C2) return N2; // X and 0 -> 0 660 if (N2C->isAllOnesValue()) 661 return N1; // X and -1 -> X 662 break; 663 case ISD::OR: 664 if (!C2)return N1; // X or 0 -> X 665 if (N2C->isAllOnesValue()) 666 return N2; // X or -1 -> -1 667 break; 668 case ISD::XOR: 669 if (!C2) return N1; // X xor 0 -> X 670 if (N2C->isAllOnesValue()) { 671 if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(N1.Val)){ 672 // !(X op Y) -> (X !op Y) 673 bool isInteger = MVT::isInteger(SetCC->getOperand(0).getValueType()); 674 return getSetCC(ISD::getSetCCInverse(SetCC->getCondition(),isInteger), 675 SetCC->getValueType(0), 676 SetCC->getOperand(0), SetCC->getOperand(1)); 677 } else if (N1.getOpcode() == ISD::AND || N1.getOpcode() == ISD::OR) { 678 SDNode *Op = N1.Val; 679 // !(X or Y) -> (!X and !Y) iff X or Y are freely invertible 680 // !(X and Y) -> (!X or !Y) iff X or Y are freely invertible 681 SDOperand LHS = Op->getOperand(0), RHS = Op->getOperand(1); 682 if (isInvertibleForFree(RHS) || isInvertibleForFree(LHS)) { 683 LHS = getNode(ISD::XOR, VT, LHS, N2); // RHS = ~LHS 684 RHS = getNode(ISD::XOR, VT, RHS, N2); // RHS = ~RHS 685 if (Op->getOpcode() == ISD::AND) 686 return getNode(ISD::OR, VT, LHS, RHS); 687 return getNode(ISD::AND, VT, LHS, RHS); 688 } 689 } 690 // X xor -1 -> not(x) ? 691 } 692 break; 693 } 694 695 // Reassociate ((X op C1) op C2) if possible. 696 if (N1.getOpcode() == Opcode && isAssociativeBinOp(Opcode)) 697 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N1.Val->getOperand(1))) 698 return getNode(Opcode, VT, N1.Val->getOperand(0), 699 getNode(Opcode, VT, N2, N1.Val->getOperand(1))); 700 } 701 702 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val); 703 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val); 704 if (N1CFP) 705 if (N2CFP) { 706 double C1 = N1CFP->getValue(), C2 = N2CFP->getValue(); 707 switch (Opcode) { 708 case ISD::ADD: return getConstantFP(C1 + C2, VT); 709 case ISD::SUB: return getConstantFP(C1 - C2, VT); 710 case ISD::MUL: return getConstantFP(C1 * C2, VT); 711 case ISD::SDIV: 712 if (C2) return getConstantFP(C1 / C2, VT); 713 break; 714 case ISD::SREM : 715 if (C2) return getConstantFP(fmod(C1, C2), VT); 716 break; 717 default: break; 718 } 719 720 } else { // Cannonicalize constant to RHS if commutative 721 if (isCommutativeBinOp(Opcode)) { 722 std::swap(N1CFP, N2CFP); 723 std::swap(N1, N2); 724 } 725 } 726 727 // Finally, fold operations that do not require constants. 728 switch (Opcode) { 729 case ISD::AND: 730 case ISD::OR: 731 if (SetCCSDNode *LHS = dyn_cast<SetCCSDNode>(N1.Val)) 732 if (SetCCSDNode *RHS = dyn_cast<SetCCSDNode>(N2.Val)) { 733 SDOperand LL = LHS->getOperand(0), RL = RHS->getOperand(0); 734 SDOperand LR = LHS->getOperand(1), RR = RHS->getOperand(1); 735 ISD::CondCode Op2 = RHS->getCondition(); 736 737 // (X op1 Y) | (Y op2 X) -> (X op1 Y) | (X swapop2 Y) 738 if (LL == RR && LR == RL) { 739 Op2 = ISD::getSetCCSwappedOperands(Op2); 740 goto MatchedBackwards; 741 } 742 743 if (LL == RL && LR == RR) { 744 MatchedBackwards: 745 ISD::CondCode Result; 746 bool isInteger = MVT::isInteger(LL.getValueType()); 747 if (Opcode == ISD::OR) 748 Result = ISD::getSetCCOrOperation(LHS->getCondition(), Op2, 749 isInteger); 750 else 751 Result = ISD::getSetCCAndOperation(LHS->getCondition(), Op2, 752 isInteger); 753 if (Result != ISD::SETCC_INVALID) 754 return getSetCC(Result, LHS->getValueType(0), LL, LR); 755 } 756 } 757 break; 758 case ISD::XOR: 759 if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 760 break; 761 case ISD::SUB: 762 if (N1.getOpcode() == ISD::ADD) { 763 if (N1.Val->getOperand(0) == N2) 764 return N1.Val->getOperand(1); // (A+B)-A == B 765 if (N1.Val->getOperand(1) == N2) 766 return N1.Val->getOperand(0); // (A+B)-B == A 767 } 768 break; 769 } 770 771 SDNode *&N = BinaryOps[std::make_pair(Opcode, std::make_pair(N1, N2))]; 772 if (N) return SDOperand(N, 0); 773 N = new SDNode(Opcode, N1, N2); 774 N->setValueTypes(VT); 775 776 AllNodes.push_back(N); 777 return SDOperand(N, 0); 778} 779 780SDOperand SelectionDAG::getLoad(MVT::ValueType VT, 781 SDOperand Chain, SDOperand Ptr) { 782 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, VT))]; 783 if (N) return SDOperand(N, 0); 784 N = new SDNode(ISD::LOAD, Chain, Ptr); 785 786 // Loads have a token chain. 787 N->setValueTypes(VT, MVT::Other); 788 AllNodes.push_back(N); 789 return SDOperand(N, 0); 790} 791 792 793SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 794 SDOperand N1, SDOperand N2, SDOperand N3) { 795 // Perform various simplifications. 796 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 797 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 798 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.Val); 799 switch (Opcode) { 800 case ISD::SELECT: 801 if (N1C) 802 if (N1C->getValue()) 803 return N2; // select true, X, Y -> X 804 else 805 return N3; // select false, X, Y -> Y 806 807 if (N2 == N3) return N2; // select C, X, X -> X 808 809 if (VT == MVT::i1) { // Boolean SELECT 810 if (N2C) { 811 if (N3C) { 812 if (N2C->getValue()) // select C, 1, 0 -> C 813 return N1; 814 return getNode(ISD::XOR, VT, N1, N3); // select C, 0, 1 -> ~C 815 } 816 817 if (N2C->getValue()) // select C, 1, X -> C | X 818 return getNode(ISD::OR, VT, N1, N3); 819 else // select C, 0, X -> ~C & X 820 return getNode(ISD::AND, VT, 821 getNode(ISD::XOR, N1.getValueType(), N1, 822 getConstant(1, N1.getValueType())), N3); 823 } else if (N3C) { 824 if (N3C->getValue()) // select C, X, 1 -> ~C | X 825 return getNode(ISD::OR, VT, 826 getNode(ISD::XOR, N1.getValueType(), N1, 827 getConstant(1, N1.getValueType())), N2); 828 else // select C, X, 0 -> C & X 829 return getNode(ISD::AND, VT, N1, N2); 830 } 831 } 832 833 break; 834 case ISD::BRCOND: 835 if (N2C) 836 if (N2C->getValue()) // Unconditional branch 837 return getNode(ISD::BR, MVT::Other, N1, N3); 838 else 839 return N1; // Never-taken branch 840 break; 841 } 842 843 SDNode *N = new SDNode(Opcode, N1, N2, N3); 844 switch (Opcode) { 845 default: 846 N->setValueTypes(VT); 847 break; 848 case ISD::DYNAMIC_STACKALLOC: // DYNAMIC_STACKALLOC produces pointer and chain 849 N->setValueTypes(VT, MVT::Other); 850 break; 851 } 852 853 // FIXME: memoize NODES 854 AllNodes.push_back(N); 855 return SDOperand(N, 0); 856} 857 858SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 859 std::vector<SDOperand> &Children) { 860 switch (Children.size()) { 861 case 0: return getNode(Opcode, VT); 862 case 1: return getNode(Opcode, VT, Children[0]); 863 case 2: return getNode(Opcode, VT, Children[0], Children[1]); 864 case 3: return getNode(Opcode, VT, Children[0], Children[1], Children[2]); 865 default: 866 // FIXME: MEMOIZE!! 867 SDNode *N = new SDNode(Opcode, Children); 868 N->setValueTypes(VT); 869 AllNodes.push_back(N); 870 return SDOperand(N, 0); 871 } 872} 873 874SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 875 MVT::ValueType EVT) { 876 877 switch (Opcode) { 878 default: assert(0 && "Bad opcode for this accessor!"); 879 case ISD::FP_ROUND_INREG: 880 assert(VT == N1.getValueType() && "Not an inreg round!"); 881 assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) && 882 "Cannot FP_ROUND_INREG integer types"); 883 if (EVT == VT) return N1; // Not actually rounding 884 assert(EVT < VT && "Not rounding down!"); 885 break; 886 case ISD::ZERO_EXTEND_INREG: 887 case ISD::SIGN_EXTEND_INREG: 888 assert(VT == N1.getValueType() && "Not an inreg extend!"); 889 assert(MVT::isInteger(VT) && MVT::isInteger(EVT) && 890 "Cannot *_EXTEND_INREG FP types"); 891 if (EVT == VT) return N1; // Not actually extending 892 assert(EVT < VT && "Not extending!"); 893 894 // If we are sign extending an extension, use the original source. 895 if (N1.getOpcode() == ISD::ZERO_EXTEND_INREG || 896 N1.getOpcode() == ISD::SIGN_EXTEND_INREG) { 897 if (N1.getOpcode() == Opcode && 898 cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) 899 return N1; 900 } 901 902 break; 903 } 904 905 EVTStruct NN; 906 NN.Opcode = Opcode; 907 NN.VT = VT; 908 NN.EVT = EVT; 909 NN.Ops.push_back(N1); 910 911 SDNode *&N = MVTSDNodes[NN]; 912 if (N) return SDOperand(N, 0); 913 N = new MVTSDNode(Opcode, VT, N1, EVT); 914 AllNodes.push_back(N); 915 return SDOperand(N, 0); 916} 917 918SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 919 SDOperand N2, MVT::ValueType EVT) { 920 switch (Opcode) { 921 default: assert(0 && "Bad opcode for this accessor!"); 922 case ISD::EXTLOAD: 923 case ISD::SEXTLOAD: 924 case ISD::ZEXTLOAD: 925 // If they are asking for an extending loat from/to the same thing, return a 926 // normal load. 927 if (VT == EVT) 928 return getNode(ISD::LOAD, VT, N1, N2); 929 assert(EVT < VT && "Should only be an extending load, not truncating!"); 930 assert((Opcode == ISD::EXTLOAD || MVT::isInteger(VT)) && 931 "Cannot sign/zero extend a FP load!"); 932 assert(MVT::isInteger(VT) == MVT::isInteger(EVT) && 933 "Cannot convert from FP to Int or Int -> FP!"); 934 break; 935 } 936 937 EVTStruct NN; 938 NN.Opcode = Opcode; 939 NN.VT = VT; 940 NN.EVT = EVT; 941 NN.Ops.push_back(N1); 942 NN.Ops.push_back(N2); 943 944 SDNode *&N = MVTSDNodes[NN]; 945 if (N) return SDOperand(N, 0); 946 N = new MVTSDNode(Opcode, VT, MVT::Other, N1, N2, EVT); 947 AllNodes.push_back(N); 948 return SDOperand(N, 0); 949} 950 951SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 952 SDOperand N2, SDOperand N3, MVT::ValueType EVT) { 953 switch (Opcode) { 954 default: assert(0 && "Bad opcode for this accessor!"); 955 case ISD::TRUNCSTORE: 956#if 0 // FIXME: If the target supports EVT natively, convert to a truncate/store 957 // If this is a truncating store of a constant, convert to the desired type 958 // and store it instead. 959 if (isa<Constant>(N1)) { 960 SDOperand Op = getNode(ISD::TRUNCATE, EVT, N1); 961 if (isa<Constant>(Op)) 962 N1 = Op; 963 } 964 // Also for ConstantFP? 965#endif 966 if (N1.getValueType() == EVT) // Normal store? 967 return getNode(ISD::STORE, VT, N1, N2, N3); 968 assert(N2.getValueType() > EVT && "Not a truncation?"); 969 assert(MVT::isInteger(N2.getValueType()) == MVT::isInteger(EVT) && 970 "Can't do FP-INT conversion!"); 971 break; 972 } 973 974 EVTStruct NN; 975 NN.Opcode = Opcode; 976 NN.VT = VT; 977 NN.EVT = EVT; 978 NN.Ops.push_back(N1); 979 NN.Ops.push_back(N2); 980 NN.Ops.push_back(N3); 981 982 SDNode *&N = MVTSDNodes[NN]; 983 if (N) return SDOperand(N, 0); 984 N = new MVTSDNode(Opcode, VT, N1, N2, N3, EVT); 985 AllNodes.push_back(N); 986 return SDOperand(N, 0); 987} 988 989 990/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 991/// indicated value. This method ignores uses of other values defined by this 992/// operation. 993bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) { 994 assert(Value < getNumValues() && "Bad value!"); 995 996 // If there is only one value, this is easy. 997 if (getNumValues() == 1) 998 return use_size() == NUses; 999 if (Uses.size() < NUses) return false; 1000 1001 SDOperand TheValue(this, Value); 1002 1003 std::set<SDNode*> UsersHandled; 1004 1005 for (std::vector<SDNode*>::iterator UI = Uses.begin(), E = Uses.end(); 1006 UI != E; ++UI) { 1007 SDNode *User = *UI; 1008 if (User->getNumOperands() == 1 || 1009 UsersHandled.insert(User).second) // First time we've seen this? 1010 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) 1011 if (User->getOperand(i) == TheValue) { 1012 if (NUses == 0) 1013 return false; // too many uses 1014 --NUses; 1015 } 1016 } 1017 1018 // Found exactly the right number of uses? 1019 return NUses == 0; 1020} 1021 1022 1023const char *SDNode::getOperationName() const { 1024 switch (getOpcode()) { 1025 default: return "<<Unknown>>"; 1026 case ISD::EntryToken: return "EntryToken"; 1027 case ISD::TokenFactor: return "TokenFactor"; 1028 case ISD::Constant: return "Constant"; 1029 case ISD::ConstantFP: return "ConstantFP"; 1030 case ISD::GlobalAddress: return "GlobalAddress"; 1031 case ISD::FrameIndex: return "FrameIndex"; 1032 case ISD::BasicBlock: return "BasicBlock"; 1033 case ISD::ExternalSymbol: return "ExternalSymbol"; 1034 case ISD::ConstantPool: return "ConstantPoolIndex"; 1035 case ISD::CopyToReg: return "CopyToReg"; 1036 case ISD::CopyFromReg: return "CopyFromReg"; 1037 case ISD::ImplicitDef: return "ImplicitDef"; 1038 1039 case ISD::ADD: return "add"; 1040 case ISD::SUB: return "sub"; 1041 case ISD::MUL: return "mul"; 1042 case ISD::SDIV: return "sdiv"; 1043 case ISD::UDIV: return "udiv"; 1044 case ISD::SREM: return "srem"; 1045 case ISD::UREM: return "urem"; 1046 case ISD::AND: return "and"; 1047 case ISD::OR: return "or"; 1048 case ISD::XOR: return "xor"; 1049 case ISD::SHL: return "shl"; 1050 case ISD::SRA: return "sra"; 1051 case ISD::SRL: return "srl"; 1052 1053 case ISD::SELECT: return "select"; 1054 case ISD::ADDC: return "addc"; 1055 case ISD::SUBB: return "subb"; 1056 1057 // Conversion operators. 1058 case ISD::SIGN_EXTEND: return "sign_extend"; 1059 case ISD::ZERO_EXTEND: return "zero_extend"; 1060 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 1061 case ISD::ZERO_EXTEND_INREG: return "zero_extend_inreg"; 1062 case ISD::TRUNCATE: return "truncate"; 1063 case ISD::FP_ROUND: return "fp_round"; 1064 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 1065 case ISD::FP_EXTEND: return "fp_extend"; 1066 1067 case ISD::SINT_TO_FP: return "sint_to_fp"; 1068 case ISD::UINT_TO_FP: return "uint_to_fp"; 1069 case ISD::FP_TO_SINT: return "fp_to_sint"; 1070 case ISD::FP_TO_UINT: return "fp_to_uint"; 1071 1072 // Control flow instructions 1073 case ISD::BR: return "br"; 1074 case ISD::BRCOND: return "brcond"; 1075 case ISD::RET: return "ret"; 1076 case ISD::CALL: return "call"; 1077 case ISD::ADJCALLSTACKDOWN: return "adjcallstackdown"; 1078 case ISD::ADJCALLSTACKUP: return "adjcallstackup"; 1079 1080 // Other operators 1081 case ISD::LOAD: return "load"; 1082 case ISD::STORE: return "store"; 1083 case ISD::EXTLOAD: return "extload"; 1084 case ISD::SEXTLOAD: return "sextload"; 1085 case ISD::ZEXTLOAD: return "zextload"; 1086 case ISD::TRUNCSTORE: return "truncstore"; 1087 1088 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 1089 case ISD::EXTRACT_ELEMENT: return "extract_element"; 1090 case ISD::BUILD_PAIR: return "build_pair"; 1091 case ISD::MEMSET: return "memset"; 1092 case ISD::MEMCPY: return "memcpy"; 1093 case ISD::MEMMOVE: return "memmove"; 1094 1095 case ISD::SETCC: 1096 const SetCCSDNode *SetCC = cast<SetCCSDNode>(this); 1097 switch (SetCC->getCondition()) { 1098 default: assert(0 && "Unknown setcc condition!"); 1099 case ISD::SETOEQ: return "setcc:setoeq"; 1100 case ISD::SETOGT: return "setcc:setogt"; 1101 case ISD::SETOGE: return "setcc:setoge"; 1102 case ISD::SETOLT: return "setcc:setolt"; 1103 case ISD::SETOLE: return "setcc:setole"; 1104 case ISD::SETONE: return "setcc:setone"; 1105 1106 case ISD::SETO: return "setcc:seto"; 1107 case ISD::SETUO: return "setcc:setuo"; 1108 case ISD::SETUEQ: return "setcc:setue"; 1109 case ISD::SETUGT: return "setcc:setugt"; 1110 case ISD::SETUGE: return "setcc:setuge"; 1111 case ISD::SETULT: return "setcc:setult"; 1112 case ISD::SETULE: return "setcc:setule"; 1113 case ISD::SETUNE: return "setcc:setune"; 1114 1115 case ISD::SETEQ: return "setcc:seteq"; 1116 case ISD::SETGT: return "setcc:setgt"; 1117 case ISD::SETGE: return "setcc:setge"; 1118 case ISD::SETLT: return "setcc:setlt"; 1119 case ISD::SETLE: return "setcc:setle"; 1120 case ISD::SETNE: return "setcc:setne"; 1121 } 1122 } 1123} 1124 1125void SDNode::dump() const { 1126 std::cerr << (void*)this << ": "; 1127 1128 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 1129 if (i) std::cerr << ","; 1130 if (getValueType(i) == MVT::Other) 1131 std::cerr << "ch"; 1132 else 1133 std::cerr << MVT::getValueTypeString(getValueType(i)); 1134 } 1135 std::cerr << " = " << getOperationName(); 1136 1137 std::cerr << " "; 1138 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1139 if (i) std::cerr << ", "; 1140 std::cerr << (void*)getOperand(i).Val; 1141 if (unsigned RN = getOperand(i).ResNo) 1142 std::cerr << ":" << RN; 1143 } 1144 1145 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 1146 std::cerr << "<" << CSDN->getValue() << ">"; 1147 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 1148 std::cerr << "<" << CSDN->getValue() << ">"; 1149 } else if (const GlobalAddressSDNode *GADN = 1150 dyn_cast<GlobalAddressSDNode>(this)) { 1151 std::cerr << "<"; 1152 WriteAsOperand(std::cerr, GADN->getGlobal()) << ">"; 1153 } else if (const FrameIndexSDNode *FIDN = 1154 dyn_cast<FrameIndexSDNode>(this)) { 1155 std::cerr << "<" << FIDN->getIndex() << ">"; 1156 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 1157 std::cerr << "<" << CP->getIndex() << ">"; 1158 } else if (const BasicBlockSDNode *BBDN = 1159 dyn_cast<BasicBlockSDNode>(this)) { 1160 std::cerr << "<"; 1161 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 1162 if (LBB) 1163 std::cerr << LBB->getName() << " "; 1164 std::cerr << (const void*)BBDN->getBasicBlock() << ">"; 1165 } else if (const RegSDNode *C2V = dyn_cast<RegSDNode>(this)) { 1166 std::cerr << "<reg #" << C2V->getReg() << ">"; 1167 } else if (const ExternalSymbolSDNode *ES = 1168 dyn_cast<ExternalSymbolSDNode>(this)) { 1169 std::cerr << "'" << ES->getSymbol() << "'"; 1170 } else if (const MVTSDNode *M = dyn_cast<MVTSDNode>(this)) { 1171 std::cerr << " - Ty = " << MVT::getValueTypeString(M->getExtraValueType()); 1172 } 1173} 1174 1175static void DumpNodes(SDNode *N, unsigned indent) { 1176 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 1177 if (N->getOperand(i).Val->hasOneUse()) 1178 DumpNodes(N->getOperand(i).Val, indent+2); 1179 else 1180 std::cerr << "\n" << std::string(indent+2, ' ') 1181 << (void*)N->getOperand(i).Val << ": <multiple use>"; 1182 1183 1184 std::cerr << "\n" << std::string(indent, ' '); 1185 N->dump(); 1186} 1187 1188void SelectionDAG::dump() const { 1189 std::cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 1190 std::vector<SDNode*> Nodes(AllNodes); 1191 std::sort(Nodes.begin(), Nodes.end()); 1192 1193 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 1194 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val) 1195 DumpNodes(Nodes[i], 2); 1196 } 1197 1198 DumpNodes(getRoot().Val, 2); 1199 1200 std::cerr << "\n\n"; 1201} 1202 1203