SelectionDAG.cpp revision 229ab2e7b24847ea0d248d3d8b3d83adc8e5f5fe
1//===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This implements the SelectionDAG class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/CodeGen/SelectionDAG.h" 15#include "llvm/Constants.h" 16#include "llvm/GlobalValue.h" 17#include "llvm/Assembly/Writer.h" 18#include "llvm/CodeGen/MachineBasicBlock.h" 19#include "llvm/Target/TargetLowering.h" 20#include <iostream> 21#include <set> 22#include <cmath> 23#include <algorithm> 24using namespace llvm; 25 26static bool isCommutativeBinOp(unsigned Opcode) { 27 switch (Opcode) { 28 case ISD::ADD: 29 case ISD::MUL: 30 case ISD::AND: 31 case ISD::OR: 32 case ISD::XOR: return true; 33 default: return false; // FIXME: Need commutative info for user ops! 34 } 35} 36 37static bool isAssociativeBinOp(unsigned Opcode) { 38 switch (Opcode) { 39 case ISD::ADD: 40 case ISD::MUL: 41 case ISD::AND: 42 case ISD::OR: 43 case ISD::XOR: return true; 44 default: return false; // FIXME: Need associative info for user ops! 45 } 46} 47 48static unsigned ExactLog2(uint64_t Val) { 49 unsigned Count = 0; 50 while (Val != 1) { 51 Val >>= 1; 52 ++Count; 53 } 54 return Count; 55} 56 57// isInvertibleForFree - Return true if there is no cost to emitting the logical 58// inverse of this node. 59static bool isInvertibleForFree(SDOperand N) { 60 if (isa<ConstantSDNode>(N.Val)) return true; 61 if (isa<SetCCSDNode>(N.Val) && N.Val->hasOneUse()) 62 return true; 63 return false; 64} 65 66 67/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 68/// when given the operation for (X op Y). 69ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) { 70 // To perform this operation, we just need to swap the L and G bits of the 71 // operation. 72 unsigned OldL = (Operation >> 2) & 1; 73 unsigned OldG = (Operation >> 1) & 1; 74 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits 75 (OldL << 1) | // New G bit 76 (OldG << 2)); // New L bit. 77} 78 79/// getSetCCInverse - Return the operation corresponding to !(X op Y), where 80/// 'op' is a valid SetCC operation. 81ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) { 82 unsigned Operation = Op; 83 if (isInteger) 84 Operation ^= 7; // Flip L, G, E bits, but not U. 85 else 86 Operation ^= 15; // Flip all of the condition bits. 87 if (Operation > ISD::SETTRUE2) 88 Operation &= ~8; // Don't let N and U bits get set. 89 return ISD::CondCode(Operation); 90} 91 92 93/// isSignedOp - For an integer comparison, return 1 if the comparison is a 94/// signed operation and 2 if the result is an unsigned comparison. Return zero 95/// if the operation does not depend on the sign of the input (setne and seteq). 96static int isSignedOp(ISD::CondCode Opcode) { 97 switch (Opcode) { 98 default: assert(0 && "Illegal integer setcc operation!"); 99 case ISD::SETEQ: 100 case ISD::SETNE: return 0; 101 case ISD::SETLT: 102 case ISD::SETLE: 103 case ISD::SETGT: 104 case ISD::SETGE: return 1; 105 case ISD::SETULT: 106 case ISD::SETULE: 107 case ISD::SETUGT: 108 case ISD::SETUGE: return 2; 109 } 110} 111 112/// getSetCCOrOperation - Return the result of a logical OR between different 113/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function 114/// returns SETCC_INVALID if it is not possible to represent the resultant 115/// comparison. 116ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2, 117 bool isInteger) { 118 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 119 // Cannot fold a signed integer setcc with an unsigned integer setcc. 120 return ISD::SETCC_INVALID; 121 122 unsigned Op = Op1 | Op2; // Combine all of the condition bits. 123 124 // If the N and U bits get set then the resultant comparison DOES suddenly 125 // care about orderedness, and is true when ordered. 126 if (Op > ISD::SETTRUE2) 127 Op &= ~16; // Clear the N bit. 128 return ISD::CondCode(Op); 129} 130 131/// getSetCCAndOperation - Return the result of a logical AND between different 132/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 133/// function returns zero if it is not possible to represent the resultant 134/// comparison. 135ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2, 136 bool isInteger) { 137 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 138 // Cannot fold a signed setcc with an unsigned setcc. 139 return ISD::SETCC_INVALID; 140 141 // Combine all of the condition bits. 142 return ISD::CondCode(Op1 & Op2); 143} 144 145const TargetMachine &SelectionDAG::getTarget() const { 146 return TLI.getTargetMachine(); 147} 148 149 150/// RemoveDeadNodes - This method deletes all unreachable nodes in the 151/// SelectionDAG, including nodes (like loads) that have uses of their token 152/// chain but no other uses and no side effect. If a node is passed in as an 153/// argument, it is used as the seed for node deletion. 154void SelectionDAG::RemoveDeadNodes(SDNode *N) { 155 std::set<SDNode*> AllNodeSet(AllNodes.begin(), AllNodes.end()); 156 157 // Create a dummy node (which is not added to allnodes), that adds a reference 158 // to the root node, preventing it from being deleted. 159 SDNode *DummyNode = new SDNode(ISD::EntryToken, getRoot()); 160 161 DeleteNodeIfDead(N, &AllNodeSet); 162 163 Restart: 164 unsigned NumNodes = AllNodeSet.size(); 165 for (std::set<SDNode*>::iterator I = AllNodeSet.begin(), E = AllNodeSet.end(); 166 I != E; ++I) { 167 // Try to delete this node. 168 DeleteNodeIfDead(*I, &AllNodeSet); 169 170 // If we actually deleted any nodes, do not use invalid iterators in 171 // AllNodeSet. 172 if (AllNodeSet.size() != NumNodes) 173 goto Restart; 174 } 175 176 // Restore AllNodes. 177 if (AllNodes.size() != NumNodes) 178 AllNodes.assign(AllNodeSet.begin(), AllNodeSet.end()); 179 180 // If the root changed (e.g. it was a dead load, update the root). 181 setRoot(DummyNode->getOperand(0)); 182 183 // Now that we are done with the dummy node, delete it. 184 DummyNode->getOperand(0).Val->removeUser(DummyNode); 185 delete DummyNode; 186} 187 188void SelectionDAG::DeleteNodeIfDead(SDNode *N, void *NodeSet) { 189 if (!N->use_empty()) 190 return; 191 192 // Okay, we really are going to delete this node. First take this out of the 193 // appropriate CSE map. 194 switch (N->getOpcode()) { 195 case ISD::Constant: 196 Constants.erase(std::make_pair(cast<ConstantSDNode>(N)->getValue(), 197 N->getValueType(0))); 198 break; 199 case ISD::ConstantFP: { 200 union { 201 double DV; 202 uint64_t IV; 203 }; 204 DV = cast<ConstantFPSDNode>(N)->getValue(); 205 ConstantFPs.erase(std::make_pair(IV, N->getValueType(0))); 206 break; 207 } 208 case ISD::GlobalAddress: 209 GlobalValues.erase(cast<GlobalAddressSDNode>(N)->getGlobal()); 210 break; 211 case ISD::FrameIndex: 212 FrameIndices.erase(cast<FrameIndexSDNode>(N)->getIndex()); 213 break; 214 case ISD::ConstantPool: 215 ConstantPoolIndices.erase(cast<ConstantPoolSDNode>(N)->getIndex()); 216 break; 217 case ISD::BasicBlock: 218 BBNodes.erase(cast<BasicBlockSDNode>(N)->getBasicBlock()); 219 break; 220 case ISD::ExternalSymbol: 221 ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 222 break; 223 224 case ISD::LOAD: 225 Loads.erase(std::make_pair(N->getOperand(1), 226 std::make_pair(N->getOperand(0), 227 N->getValueType(0)))); 228 break; 229 case ISD::SETCC: 230 SetCCs.erase(std::make_pair(std::make_pair(N->getOperand(0), 231 N->getOperand(1)), 232 std::make_pair( 233 cast<SetCCSDNode>(N)->getCondition(), 234 N->getValueType(0)))); 235 break; 236 case ISD::TRUNCSTORE: 237 case ISD::SIGN_EXTEND_INREG: 238 case ISD::FP_ROUND_INREG: 239 case ISD::EXTLOAD: 240 case ISD::SEXTLOAD: 241 case ISD::ZEXTLOAD: { 242 EVTStruct NN; 243 NN.Opcode = N->getOpcode(); 244 NN.VT = N->getValueType(0); 245 NN.EVT = cast<MVTSDNode>(N)->getExtraValueType(); 246 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 247 NN.Ops.push_back(N->getOperand(i)); 248 MVTSDNodes.erase(NN); 249 break; 250 } 251 default: 252 if (N->getNumOperands() == 1) 253 UnaryOps.erase(std::make_pair(N->getOpcode(), 254 std::make_pair(N->getOperand(0), 255 N->getValueType(0)))); 256 else if (N->getNumOperands() == 2) 257 BinaryOps.erase(std::make_pair(N->getOpcode(), 258 std::make_pair(N->getOperand(0), 259 N->getOperand(1)))); 260 break; 261 } 262 263 // Next, brutally remove the operand list. 264 while (!N->Operands.empty()) { 265 SDNode *O = N->Operands.back().Val; 266 N->Operands.pop_back(); 267 O->removeUser(N); 268 269 // Now that we removed this operand, see if there are no uses of it left. 270 DeleteNodeIfDead(O, NodeSet); 271 } 272 273 // Remove the node from the nodes set and delete it. 274 std::set<SDNode*> &AllNodeSet = *(std::set<SDNode*>*)NodeSet; 275 AllNodeSet.erase(N); 276 277 // Now that the node is gone, check to see if any of the operands of this node 278 // are dead now. 279 delete N; 280} 281 282 283SelectionDAG::~SelectionDAG() { 284 for (unsigned i = 0, e = AllNodes.size(); i != e; ++i) 285 delete AllNodes[i]; 286} 287 288SDOperand SelectionDAG::getZeroExtendInReg(SDOperand Op, MVT::ValueType VT) { 289 if (Op.getValueType() == VT) return Op; 290 int64_t Imm = ~0ULL >> 64-MVT::getSizeInBits(VT); 291 return getNode(ISD::AND, Op.getValueType(), Op, 292 getConstant(Imm, Op.getValueType())); 293} 294 295SDOperand SelectionDAG::getConstant(uint64_t Val, MVT::ValueType VT) { 296 assert(MVT::isInteger(VT) && "Cannot create FP integer constant!"); 297 // Mask out any bits that are not valid for this constant. 298 if (VT != MVT::i64) 299 Val &= ((uint64_t)1 << MVT::getSizeInBits(VT)) - 1; 300 301 SDNode *&N = Constants[std::make_pair(Val, VT)]; 302 if (N) return SDOperand(N, 0); 303 N = new ConstantSDNode(Val, VT); 304 AllNodes.push_back(N); 305 return SDOperand(N, 0); 306} 307 308SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) { 309 assert(MVT::isFloatingPoint(VT) && "Cannot create integer FP constant!"); 310 if (VT == MVT::f32) 311 Val = (float)Val; // Mask out extra precision. 312 313 // Do the map lookup using the actual bit pattern for the floating point 314 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and 315 // we don't have issues with SNANs. 316 union { 317 double DV; 318 uint64_t IV; 319 }; 320 321 DV = Val; 322 323 SDNode *&N = ConstantFPs[std::make_pair(IV, VT)]; 324 if (N) return SDOperand(N, 0); 325 N = new ConstantFPSDNode(Val, VT); 326 AllNodes.push_back(N); 327 return SDOperand(N, 0); 328} 329 330 331 332SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV, 333 MVT::ValueType VT) { 334 SDNode *&N = GlobalValues[GV]; 335 if (N) return SDOperand(N, 0); 336 N = new GlobalAddressSDNode(GV,VT); 337 AllNodes.push_back(N); 338 return SDOperand(N, 0); 339} 340 341SDOperand SelectionDAG::getFrameIndex(int FI, MVT::ValueType VT) { 342 SDNode *&N = FrameIndices[FI]; 343 if (N) return SDOperand(N, 0); 344 N = new FrameIndexSDNode(FI, VT); 345 AllNodes.push_back(N); 346 return SDOperand(N, 0); 347} 348 349SDOperand SelectionDAG::getConstantPool(unsigned CPIdx, MVT::ValueType VT) { 350 SDNode *N = ConstantPoolIndices[CPIdx]; 351 if (N) return SDOperand(N, 0); 352 N = new ConstantPoolSDNode(CPIdx, VT); 353 AllNodes.push_back(N); 354 return SDOperand(N, 0); 355} 356 357SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 358 SDNode *&N = BBNodes[MBB]; 359 if (N) return SDOperand(N, 0); 360 N = new BasicBlockSDNode(MBB); 361 AllNodes.push_back(N); 362 return SDOperand(N, 0); 363} 364 365SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT::ValueType VT) { 366 SDNode *&N = ExternalSymbols[Sym]; 367 if (N) return SDOperand(N, 0); 368 N = new ExternalSymbolSDNode(Sym, VT); 369 AllNodes.push_back(N); 370 return SDOperand(N, 0); 371} 372 373SDOperand SelectionDAG::getSetCC(ISD::CondCode Cond, MVT::ValueType VT, 374 SDOperand N1, SDOperand N2) { 375 // These setcc operations always fold. 376 switch (Cond) { 377 default: break; 378 case ISD::SETFALSE: 379 case ISD::SETFALSE2: return getConstant(0, VT); 380 case ISD::SETTRUE: 381 case ISD::SETTRUE2: return getConstant(1, VT); 382 } 383 384 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) { 385 uint64_t C2 = N2C->getValue(); 386 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) { 387 uint64_t C1 = N1C->getValue(); 388 389 // Sign extend the operands if required 390 if (ISD::isSignedIntSetCC(Cond)) { 391 C1 = N1C->getSignExtended(); 392 C2 = N2C->getSignExtended(); 393 } 394 395 switch (Cond) { 396 default: assert(0 && "Unknown integer setcc!"); 397 case ISD::SETEQ: return getConstant(C1 == C2, VT); 398 case ISD::SETNE: return getConstant(C1 != C2, VT); 399 case ISD::SETULT: return getConstant(C1 < C2, VT); 400 case ISD::SETUGT: return getConstant(C1 > C2, VT); 401 case ISD::SETULE: return getConstant(C1 <= C2, VT); 402 case ISD::SETUGE: return getConstant(C1 >= C2, VT); 403 case ISD::SETLT: return getConstant((int64_t)C1 < (int64_t)C2, VT); 404 case ISD::SETGT: return getConstant((int64_t)C1 > (int64_t)C2, VT); 405 case ISD::SETLE: return getConstant((int64_t)C1 <= (int64_t)C2, VT); 406 case ISD::SETGE: return getConstant((int64_t)C1 >= (int64_t)C2, VT); 407 } 408 } else { 409 // If the LHS is a ZERO_EXTEND and if this is an ==/!= comparison, perform 410 // the comparison on the input. 411 if (N1.getOpcode() == ISD::ZERO_EXTEND) { 412 unsigned InSize = MVT::getSizeInBits(N1.getOperand(0).getValueType()); 413 414 // If the comparison constant has bits in the upper part, the 415 // zero-extended value could never match. 416 if (C2 & (~0ULL << InSize)) { 417 unsigned VSize = MVT::getSizeInBits(N1.getValueType()); 418 switch (Cond) { 419 case ISD::SETUGT: 420 case ISD::SETUGE: 421 case ISD::SETEQ: return getConstant(0, VT); 422 case ISD::SETULT: 423 case ISD::SETULE: 424 case ISD::SETNE: return getConstant(1, VT); 425 case ISD::SETGT: 426 case ISD::SETGE: 427 // True if the sign bit of C2 is set. 428 return getConstant((C2 & (1ULL << VSize)) != 0, VT); 429 case ISD::SETLT: 430 case ISD::SETLE: 431 // True if the sign bit of C2 isn't set. 432 return getConstant((C2 & (1ULL << VSize)) == 0, VT); 433 default: 434 break; 435 } 436 } 437 438 // Otherwise, we can perform the comparison with the low bits. 439 switch (Cond) { 440 case ISD::SETEQ: 441 case ISD::SETNE: 442 case ISD::SETUGT: 443 case ISD::SETUGE: 444 case ISD::SETULT: 445 case ISD::SETULE: 446 return getSetCC(Cond, VT, N1.getOperand(0), 447 getConstant(C2, N1.getOperand(0).getValueType())); 448 default: 449 break; // todo, be more careful with signed comparisons 450 } 451 } 452 453 454 uint64_t MinVal, MaxVal; 455 unsigned OperandBitSize = MVT::getSizeInBits(N2C->getValueType(0)); 456 if (ISD::isSignedIntSetCC(Cond)) { 457 MinVal = 1ULL << (OperandBitSize-1); 458 if (OperandBitSize != 1) // Avoid X >> 64, which is undefined. 459 MaxVal = ~0ULL >> (65-OperandBitSize); 460 else 461 MaxVal = 0; 462 } else { 463 MinVal = 0; 464 MaxVal = ~0ULL >> (64-OperandBitSize); 465 } 466 467 // Canonicalize GE/LE comparisons to use GT/LT comparisons. 468 if (Cond == ISD::SETGE || Cond == ISD::SETUGE) { 469 if (C2 == MinVal) return getConstant(1, VT); // X >= MIN --> true 470 --C2; // X >= C1 --> X > (C1-1) 471 Cond = (Cond == ISD::SETGE) ? ISD::SETGT : ISD::SETUGT; 472 N2 = getConstant(C2, N2.getValueType()); 473 N2C = cast<ConstantSDNode>(N2.Val); 474 } 475 476 if (Cond == ISD::SETLE || Cond == ISD::SETULE) { 477 if (C2 == MaxVal) return getConstant(1, VT); // X <= MAX --> true 478 ++C2; // X <= C1 --> X < (C1+1) 479 Cond = (Cond == ISD::SETLE) ? ISD::SETLT : ISD::SETULT; 480 N2 = getConstant(C2, N2.getValueType()); 481 N2C = cast<ConstantSDNode>(N2.Val); 482 } 483 484 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal) 485 return getConstant(0, VT); // X < MIN --> false 486 487 // Canonicalize setgt X, Min --> setne X, Min 488 if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MinVal) 489 return getSetCC(ISD::SETNE, VT, N1, N2); 490 491 // If we have setult X, 1, turn it into seteq X, 0 492 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal+1) 493 return getSetCC(ISD::SETEQ, VT, N1, 494 getConstant(MinVal, N1.getValueType())); 495 // If we have setugt X, Max-1, turn it into seteq X, Max 496 else if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MaxVal-1) 497 return getSetCC(ISD::SETEQ, VT, N1, 498 getConstant(MaxVal, N1.getValueType())); 499 500 // If we have "setcc X, C1", check to see if we can shrink the immediate 501 // by changing cc. 502 503 // SETUGT X, SINTMAX -> SETLT X, 0 504 if (Cond == ISD::SETUGT && OperandBitSize != 1 && 505 C2 == (~0ULL >> (65-OperandBitSize))) 506 return getSetCC(ISD::SETLT, VT, N1, getConstant(0, N2.getValueType())); 507 508 // FIXME: Implement the rest of these. 509 510 511 // Fold bit comparisons when we can. 512 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) && 513 VT == N1.getValueType() && N1.getOpcode() == ISD::AND) 514 if (ConstantSDNode *AndRHS = 515 dyn_cast<ConstantSDNode>(N1.getOperand(1))) { 516 if (Cond == ISD::SETNE && C2 == 0) {// (X & 8) != 0 --> (X & 8) >> 3 517 // Perform the xform if the AND RHS is a single bit. 518 if ((AndRHS->getValue() & (AndRHS->getValue()-1)) == 0) { 519 return getNode(ISD::SRL, VT, N1, 520 getConstant(ExactLog2(AndRHS->getValue()), 521 TLI.getShiftAmountTy())); 522 } 523 } else if (Cond == ISD::SETEQ && C2 == AndRHS->getValue()) { 524 // (X & 8) == 8 --> (X & 8) >> 3 525 // Perform the xform if C2 is a single bit. 526 if ((C2 & (C2-1)) == 0) { 527 return getNode(ISD::SRL, VT, N1, 528 getConstant(ExactLog2(C2),TLI.getShiftAmountTy())); 529 } 530 } 531 } 532 } 533 } else if (isa<ConstantSDNode>(N1.Val)) { 534 // Ensure that the constant occurs on the RHS. 535 return getSetCC(ISD::getSetCCSwappedOperands(Cond), VT, N2, N1); 536 } 537 538 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) 539 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) { 540 double C1 = N1C->getValue(), C2 = N2C->getValue(); 541 542 switch (Cond) { 543 default: break; // FIXME: Implement the rest of these! 544 case ISD::SETEQ: return getConstant(C1 == C2, VT); 545 case ISD::SETNE: return getConstant(C1 != C2, VT); 546 case ISD::SETLT: return getConstant(C1 < C2, VT); 547 case ISD::SETGT: return getConstant(C1 > C2, VT); 548 case ISD::SETLE: return getConstant(C1 <= C2, VT); 549 case ISD::SETGE: return getConstant(C1 >= C2, VT); 550 } 551 } else { 552 // Ensure that the constant occurs on the RHS. 553 Cond = ISD::getSetCCSwappedOperands(Cond); 554 std::swap(N1, N2); 555 } 556 557 if (N1 == N2) { 558 // We can always fold X == Y for integer setcc's. 559 if (MVT::isInteger(N1.getValueType())) 560 return getConstant(ISD::isTrueWhenEqual(Cond), VT); 561 unsigned UOF = ISD::getUnorderedFlavor(Cond); 562 if (UOF == 2) // FP operators that are undefined on NaNs. 563 return getConstant(ISD::isTrueWhenEqual(Cond), VT); 564 if (UOF == ISD::isTrueWhenEqual(Cond)) 565 return getConstant(UOF, VT); 566 // Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO 567 // if it is not already. 568 Cond = UOF == 0 ? ISD::SETUO : ISD::SETO; 569 } 570 571 if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) && 572 MVT::isInteger(N1.getValueType())) { 573 if (N1.getOpcode() == ISD::ADD || N1.getOpcode() == ISD::SUB || 574 N1.getOpcode() == ISD::XOR) { 575 // Simplify (X+Y) == (X+Z) --> Y == Z 576 if (N1.getOpcode() == N2.getOpcode()) { 577 if (N1.getOperand(0) == N2.getOperand(0)) 578 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(1)); 579 if (N1.getOperand(1) == N2.getOperand(1)) 580 return getSetCC(Cond, VT, N1.getOperand(0), N2.getOperand(0)); 581 if (isCommutativeBinOp(N1.getOpcode())) { 582 // If X op Y == Y op X, try other combinations. 583 if (N1.getOperand(0) == N2.getOperand(1)) 584 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(0)); 585 if (N1.getOperand(1) == N2.getOperand(0)) 586 return getSetCC(Cond, VT, N1.getOperand(1), N2.getOperand(1)); 587 } 588 } 589 590 // FIXME: move this stuff to the DAG Combiner when it exists! 591 592 // Simplify (X+Z) == X --> Z == 0 593 if (N1.getOperand(0) == N2) 594 return getSetCC(Cond, VT, N1.getOperand(1), 595 getConstant(0, N1.getValueType())); 596 if (N1.getOperand(1) == N2) { 597 if (isCommutativeBinOp(N1.getOpcode())) 598 return getSetCC(Cond, VT, N1.getOperand(0), 599 getConstant(0, N1.getValueType())); 600 else { 601 assert(N1.getOpcode() == ISD::SUB && "Unexpected operation!"); 602 // (Z-X) == X --> Z == X<<1 603 return getSetCC(Cond, VT, N1.getOperand(0), 604 getNode(ISD::SHL, N2.getValueType(), 605 N2, getConstant(1, TLI.getShiftAmountTy()))); 606 } 607 } 608 } 609 610 if (N2.getOpcode() == ISD::ADD || N2.getOpcode() == ISD::SUB || 611 N2.getOpcode() == ISD::XOR) { 612 // Simplify X == (X+Z) --> Z == 0 613 if (N2.getOperand(0) == N1) 614 return getSetCC(Cond, VT, N2.getOperand(1), 615 getConstant(0, N2.getValueType())); 616 else if (N2.getOperand(1) == N1) 617 return getSetCC(Cond, VT, N2.getOperand(0), 618 getConstant(0, N2.getValueType())); 619 } 620 } 621 622 // Fold away ALL boolean setcc's. 623 if (N1.getValueType() == MVT::i1) { 624 switch (Cond) { 625 default: assert(0 && "Unknown integer setcc!"); 626 case ISD::SETEQ: // X == Y -> (X^Y)^1 627 N1 = getNode(ISD::XOR, MVT::i1, 628 getNode(ISD::XOR, MVT::i1, N1, N2), 629 getConstant(1, MVT::i1)); 630 break; 631 case ISD::SETNE: // X != Y --> (X^Y) 632 N1 = getNode(ISD::XOR, MVT::i1, N1, N2); 633 break; 634 case ISD::SETGT: // X >s Y --> X == 0 & Y == 1 --> X^1 & Y 635 case ISD::SETULT: // X <u Y --> X == 0 & Y == 1 --> X^1 & Y 636 N1 = getNode(ISD::AND, MVT::i1, N2, 637 getNode(ISD::XOR, MVT::i1, N1, getConstant(1, MVT::i1))); 638 break; 639 case ISD::SETLT: // X <s Y --> X == 1 & Y == 0 --> Y^1 & X 640 case ISD::SETUGT: // X >u Y --> X == 1 & Y == 0 --> Y^1 & X 641 N1 = getNode(ISD::AND, MVT::i1, N1, 642 getNode(ISD::XOR, MVT::i1, N2, getConstant(1, MVT::i1))); 643 break; 644 case ISD::SETULE: // X <=u Y --> X == 0 | Y == 1 --> X^1 | Y 645 case ISD::SETGE: // X >=s Y --> X == 0 | Y == 1 --> X^1 | Y 646 N1 = getNode(ISD::OR, MVT::i1, N2, 647 getNode(ISD::XOR, MVT::i1, N1, getConstant(1, MVT::i1))); 648 break; 649 case ISD::SETUGE: // X >=u Y --> X == 1 | Y == 0 --> Y^1 | X 650 case ISD::SETLE: // X <=s Y --> X == 1 | Y == 0 --> Y^1 | X 651 N1 = getNode(ISD::OR, MVT::i1, N1, 652 getNode(ISD::XOR, MVT::i1, N2, getConstant(1, MVT::i1))); 653 break; 654 } 655 if (VT != MVT::i1) 656 N1 = getNode(ISD::ZERO_EXTEND, VT, N1); 657 return N1; 658 } 659 660 661 SetCCSDNode *&N = SetCCs[std::make_pair(std::make_pair(N1, N2), 662 std::make_pair(Cond, VT))]; 663 if (N) return SDOperand(N, 0); 664 N = new SetCCSDNode(Cond, N1, N2); 665 N->setValueTypes(VT); 666 AllNodes.push_back(N); 667 return SDOperand(N, 0); 668} 669 670 671 672/// getNode - Gets or creates the specified node. 673/// 674SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT) { 675 SDNode *N = new SDNode(Opcode, VT); 676 AllNodes.push_back(N); 677 return SDOperand(N, 0); 678} 679 680SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 681 SDOperand Operand) { 682 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) { 683 uint64_t Val = C->getValue(); 684 switch (Opcode) { 685 default: break; 686 case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT); 687 case ISD::ZERO_EXTEND: return getConstant(Val, VT); 688 case ISD::TRUNCATE: return getConstant(Val, VT); 689 case ISD::SINT_TO_FP: return getConstantFP(C->getSignExtended(), VT); 690 case ISD::UINT_TO_FP: return getConstantFP(C->getValue(), VT); 691 } 692 } 693 694 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) 695 switch (Opcode) { 696 case ISD::FNEG: 697 return getConstantFP(-C->getValue(), VT); 698 case ISD::FP_ROUND: 699 case ISD::FP_EXTEND: 700 return getConstantFP(C->getValue(), VT); 701 case ISD::FP_TO_SINT: 702 return getConstant((int64_t)C->getValue(), VT); 703 case ISD::FP_TO_UINT: 704 return getConstant((uint64_t)C->getValue(), VT); 705 } 706 707 unsigned OpOpcode = Operand.Val->getOpcode(); 708 switch (Opcode) { 709 case ISD::TokenFactor: 710 return Operand; // Factor of one node? No factor. 711 case ISD::SIGN_EXTEND: 712 if (Operand.getValueType() == VT) return Operand; // noop extension 713 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 714 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 715 break; 716 case ISD::ZERO_EXTEND: 717 if (Operand.getValueType() == VT) return Operand; // noop extension 718 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x) 719 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0)); 720 break; 721 case ISD::TRUNCATE: 722 if (Operand.getValueType() == VT) return Operand; // noop truncate 723 if (OpOpcode == ISD::TRUNCATE) 724 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 725 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND) { 726 // If the source is smaller than the dest, we still need an extend. 727 if (Operand.Val->getOperand(0).getValueType() < VT) 728 return getNode(OpOpcode, VT, Operand.Val->getOperand(0)); 729 else if (Operand.Val->getOperand(0).getValueType() > VT) 730 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0)); 731 else 732 return Operand.Val->getOperand(0); 733 } 734 break; 735 case ISD::FNEG: 736 if (OpOpcode == ISD::SUB) // -(X-Y) -> (Y-X) 737 return getNode(ISD::SUB, VT, Operand.Val->getOperand(1), 738 Operand.Val->getOperand(0)); 739 if (OpOpcode == ISD::FNEG) // --X -> X 740 return Operand.Val->getOperand(0); 741 break; 742 case ISD::FABS: 743 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X) 744 return getNode(ISD::FABS, VT, Operand.Val->getOperand(0)); 745 break; 746 } 747 748 SDNode *&N = UnaryOps[std::make_pair(Opcode, std::make_pair(Operand, VT))]; 749 if (N) return SDOperand(N, 0); 750 N = new SDNode(Opcode, Operand); 751 N->setValueTypes(VT); 752 AllNodes.push_back(N); 753 return SDOperand(N, 0); 754} 755 756/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use 757/// this predicate to simplify operations downstream. V and Mask are known to 758/// be the same type. 759static bool MaskedValueIsZero(const SDOperand &Op, uint64_t Mask, 760 const TargetLowering &TLI) { 761 unsigned SrcBits; 762 if (Mask == 0) return true; 763 764 // If we know the result of a setcc has the top bits zero, use this info. 765 switch (Op.getOpcode()) { 766 case ISD::UNDEF: 767 return true; 768 case ISD::Constant: 769 return (cast<ConstantSDNode>(Op)->getValue() & Mask) == 0; 770 771 case ISD::SETCC: 772 return ((Mask & 1) == 0) && 773 TLI.getSetCCResultContents() == TargetLowering::ZeroOrOneSetCCResult; 774 775 case ISD::ZEXTLOAD: 776 SrcBits = MVT::getSizeInBits(cast<MVTSDNode>(Op)->getExtraValueType()); 777 return (Mask & ((1ULL << SrcBits)-1)) == 0; // Returning only the zext bits. 778 case ISD::ZERO_EXTEND: 779 SrcBits = MVT::getSizeInBits(Op.getOperand(0).getValueType()); 780 return MaskedValueIsZero(Op.getOperand(0),Mask & ((1ULL << SrcBits)-1),TLI); 781 782 case ISD::AND: 783 // (X & C1) & C2 == 0 iff C1 & C2 == 0. 784 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1))) 785 return MaskedValueIsZero(Op.getOperand(0),AndRHS->getValue() & Mask, TLI); 786 787 // FALL THROUGH 788 case ISD::OR: 789 case ISD::XOR: 790 return MaskedValueIsZero(Op.getOperand(0), Mask, TLI) && 791 MaskedValueIsZero(Op.getOperand(1), Mask, TLI); 792 case ISD::SELECT: 793 return MaskedValueIsZero(Op.getOperand(1), Mask, TLI) && 794 MaskedValueIsZero(Op.getOperand(2), Mask, TLI); 795 796 case ISD::SRL: 797 // (ushr X, C1) & C2 == 0 iff X & (C2 << C1) == 0 798 if (ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 799 uint64_t NewVal = Mask << ShAmt->getValue(); 800 SrcBits = MVT::getSizeInBits(Op.getValueType()); 801 if (SrcBits != 64) NewVal &= (1ULL << SrcBits)-1; 802 return MaskedValueIsZero(Op.getOperand(0), NewVal, TLI); 803 } 804 return false; 805 case ISD::SHL: 806 // (ushl X, C1) & C2 == 0 iff X & (C2 >> C1) == 0 807 if (ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 808 uint64_t NewVal = Mask >> ShAmt->getValue(); 809 return MaskedValueIsZero(Op.getOperand(0), NewVal, TLI); 810 } 811 return false; 812 // TODO we could handle some SRA cases here. 813 default: break; 814 } 815 816 return false; 817} 818 819 820 821SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 822 SDOperand N1, SDOperand N2) { 823#ifndef NDEBUG 824 switch (Opcode) { 825 case ISD::TokenFactor: 826 assert(VT == MVT::Other && N1.getValueType() == MVT::Other && 827 N2.getValueType() == MVT::Other && "Invalid token factor!"); 828 break; 829 case ISD::AND: 830 case ISD::OR: 831 case ISD::XOR: 832 case ISD::UDIV: 833 case ISD::UREM: 834 assert(MVT::isInteger(VT) && "This operator does not apply to FP types!"); 835 // fall through 836 case ISD::ADD: 837 case ISD::SUB: 838 case ISD::MUL: 839 case ISD::SDIV: 840 case ISD::SREM: 841 assert(N1.getValueType() == N2.getValueType() && 842 N1.getValueType() == VT && "Binary operator types must match!"); 843 break; 844 845 case ISD::SHL: 846 case ISD::SRA: 847 case ISD::SRL: 848 assert(VT == N1.getValueType() && 849 "Shift operators return type must be the same as their first arg"); 850 assert(MVT::isInteger(VT) && MVT::isInteger(N2.getValueType()) && 851 VT != MVT::i1 && "Shifts only work on integers"); 852 break; 853 default: break; 854 } 855#endif 856 857 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 858 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 859 if (N1C) { 860 if (N2C) { 861 uint64_t C1 = N1C->getValue(), C2 = N2C->getValue(); 862 switch (Opcode) { 863 case ISD::ADD: return getConstant(C1 + C2, VT); 864 case ISD::SUB: return getConstant(C1 - C2, VT); 865 case ISD::MUL: return getConstant(C1 * C2, VT); 866 case ISD::UDIV: 867 if (C2) return getConstant(C1 / C2, VT); 868 break; 869 case ISD::UREM : 870 if (C2) return getConstant(C1 % C2, VT); 871 break; 872 case ISD::SDIV : 873 if (C2) return getConstant(N1C->getSignExtended() / 874 N2C->getSignExtended(), VT); 875 break; 876 case ISD::SREM : 877 if (C2) return getConstant(N1C->getSignExtended() % 878 N2C->getSignExtended(), VT); 879 break; 880 case ISD::AND : return getConstant(C1 & C2, VT); 881 case ISD::OR : return getConstant(C1 | C2, VT); 882 case ISD::XOR : return getConstant(C1 ^ C2, VT); 883 case ISD::SHL : return getConstant(C1 << (int)C2, VT); 884 case ISD::SRL : return getConstant(C1 >> (unsigned)C2, VT); 885 case ISD::SRA : return getConstant(N1C->getSignExtended() >>(int)C2, VT); 886 default: break; 887 } 888 889 } else { // Cannonicalize constant to RHS if commutative 890 if (isCommutativeBinOp(Opcode)) { 891 std::swap(N1C, N2C); 892 std::swap(N1, N2); 893 } 894 } 895 896 switch (Opcode) { 897 default: break; 898 case ISD::SHL: // shl 0, X -> 0 899 if (N1C->isNullValue()) return N1; 900 break; 901 case ISD::SRL: // srl 0, X -> 0 902 if (N1C->isNullValue()) return N1; 903 break; 904 case ISD::SRA: // sra -1, X -> -1 905 if (N1C->isAllOnesValue()) return N1; 906 break; 907 } 908 } 909 910 if (N2C) { 911 uint64_t C2 = N2C->getValue(); 912 913 switch (Opcode) { 914 case ISD::ADD: 915 if (!C2) return N1; // add X, 0 -> X 916 break; 917 case ISD::SUB: 918 if (!C2) return N1; // sub X, 0 -> X 919 break; 920 case ISD::MUL: 921 if (!C2) return N2; // mul X, 0 -> 0 922 if (N2C->isAllOnesValue()) // mul X, -1 -> 0-X 923 return getNode(ISD::SUB, VT, getConstant(0, VT), N1); 924 925 // FIXME: Move this to the DAG combiner when it exists. 926 if ((C2 & C2-1) == 0) { 927 SDOperand ShAmt = getConstant(ExactLog2(C2), TLI.getShiftAmountTy()); 928 return getNode(ISD::SHL, VT, N1, ShAmt); 929 } 930 break; 931 932 case ISD::UDIV: 933 // FIXME: Move this to the DAG combiner when it exists. 934 if ((C2 & C2-1) == 0 && C2) { 935 SDOperand ShAmt = getConstant(ExactLog2(C2), TLI.getShiftAmountTy()); 936 return getNode(ISD::SRL, VT, N1, ShAmt); 937 } 938 break; 939 940 case ISD::SHL: 941 case ISD::SRL: 942 case ISD::SRA: 943 // If the shift amount is bigger than the size of the data, then all the 944 // bits are shifted out. Simplify to undef. 945 if (C2 >= MVT::getSizeInBits(N1.getValueType())) { 946 return getNode(ISD::UNDEF, N1.getValueType()); 947 } 948 if (C2 == 0) return N1; 949 break; 950 951 case ISD::AND: 952 if (!C2) return N2; // X and 0 -> 0 953 if (N2C->isAllOnesValue()) 954 return N1; // X and -1 -> X 955 956 if (MaskedValueIsZero(N1, C2, TLI)) // X and 0 -> 0 957 return getConstant(0, VT); 958 959 { 960 uint64_t NotC2 = ~C2; 961 if (VT != MVT::i64) 962 NotC2 &= (1ULL << MVT::getSizeInBits(VT))-1; 963 964 if (MaskedValueIsZero(N1, NotC2, TLI)) 965 return N1; // if (X & ~C2) -> 0, the and is redundant 966 } 967 968 // FIXME: Should add a corresponding version of this for 969 // ZERO_EXTEND/SIGN_EXTEND by converting them to an ANY_EXTEND node which 970 // we don't have yet. 971 972 // and (sign_extend_inreg x:16:32), 1 -> and x, 1 973 if (N1.getOpcode() == ISD::SIGN_EXTEND_INREG) { 974 // If we are masking out the part of our input that was extended, just 975 // mask the input to the extension directly. 976 unsigned ExtendBits = 977 MVT::getSizeInBits(cast<MVTSDNode>(N1)->getExtraValueType()); 978 if ((C2 & (~0ULL << ExtendBits)) == 0) 979 return getNode(ISD::AND, VT, N1.getOperand(0), N2); 980 } 981 break; 982 case ISD::OR: 983 if (!C2)return N1; // X or 0 -> X 984 if (N2C->isAllOnesValue()) 985 return N2; // X or -1 -> -1 986 break; 987 case ISD::XOR: 988 if (!C2) return N1; // X xor 0 -> X 989 if (N2C->isAllOnesValue()) { 990 if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(N1.Val)){ 991 // !(X op Y) -> (X !op Y) 992 bool isInteger = MVT::isInteger(SetCC->getOperand(0).getValueType()); 993 return getSetCC(ISD::getSetCCInverse(SetCC->getCondition(),isInteger), 994 SetCC->getValueType(0), 995 SetCC->getOperand(0), SetCC->getOperand(1)); 996 } else if (N1.getOpcode() == ISD::AND || N1.getOpcode() == ISD::OR) { 997 SDNode *Op = N1.Val; 998 // !(X or Y) -> (!X and !Y) iff X or Y are freely invertible 999 // !(X and Y) -> (!X or !Y) iff X or Y are freely invertible 1000 SDOperand LHS = Op->getOperand(0), RHS = Op->getOperand(1); 1001 if (isInvertibleForFree(RHS) || isInvertibleForFree(LHS)) { 1002 LHS = getNode(ISD::XOR, VT, LHS, N2); // RHS = ~LHS 1003 RHS = getNode(ISD::XOR, VT, RHS, N2); // RHS = ~RHS 1004 if (Op->getOpcode() == ISD::AND) 1005 return getNode(ISD::OR, VT, LHS, RHS); 1006 return getNode(ISD::AND, VT, LHS, RHS); 1007 } 1008 } 1009 // X xor -1 -> not(x) ? 1010 } 1011 break; 1012 } 1013 1014 // Reassociate ((X op C1) op C2) if possible. 1015 if (N1.getOpcode() == Opcode && isAssociativeBinOp(Opcode)) 1016 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N1.Val->getOperand(1))) 1017 return getNode(Opcode, VT, N1.Val->getOperand(0), 1018 getNode(Opcode, VT, N2, N1.Val->getOperand(1))); 1019 } 1020 1021 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val); 1022 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val); 1023 if (N1CFP) 1024 if (N2CFP) { 1025 double C1 = N1CFP->getValue(), C2 = N2CFP->getValue(); 1026 switch (Opcode) { 1027 case ISD::ADD: return getConstantFP(C1 + C2, VT); 1028 case ISD::SUB: return getConstantFP(C1 - C2, VT); 1029 case ISD::MUL: return getConstantFP(C1 * C2, VT); 1030 case ISD::SDIV: 1031 if (C2) return getConstantFP(C1 / C2, VT); 1032 break; 1033 case ISD::SREM : 1034 if (C2) return getConstantFP(fmod(C1, C2), VT); 1035 break; 1036 default: break; 1037 } 1038 1039 } else { // Cannonicalize constant to RHS if commutative 1040 if (isCommutativeBinOp(Opcode)) { 1041 std::swap(N1CFP, N2CFP); 1042 std::swap(N1, N2); 1043 } 1044 } 1045 1046 // Finally, fold operations that do not require constants. 1047 switch (Opcode) { 1048 case ISD::TokenFactor: 1049 if (N1.getOpcode() == ISD::EntryToken) 1050 return N2; 1051 if (N2.getOpcode() == ISD::EntryToken) 1052 return N1; 1053 break; 1054 1055 case ISD::AND: 1056 case ISD::OR: 1057 if (SetCCSDNode *LHS = dyn_cast<SetCCSDNode>(N1.Val)) 1058 if (SetCCSDNode *RHS = dyn_cast<SetCCSDNode>(N2.Val)) { 1059 SDOperand LL = LHS->getOperand(0), RL = RHS->getOperand(0); 1060 SDOperand LR = LHS->getOperand(1), RR = RHS->getOperand(1); 1061 ISD::CondCode Op2 = RHS->getCondition(); 1062 1063 if (LR == RR && isa<ConstantSDNode>(LR) && 1064 Op2 == LHS->getCondition() && MVT::isInteger(LL.getValueType())) { 1065 // (X != 0) | (Y != 0) -> (X|Y != 0) 1066 // (X == 0) & (Y == 0) -> (X|Y == 0) 1067 // (X < 0) | (Y < 0) -> (X|Y < 0) 1068 if (cast<ConstantSDNode>(LR)->getValue() == 0 && 1069 ((Op2 == ISD::SETEQ && Opcode == ISD::AND) || 1070 (Op2 == ISD::SETNE && Opcode == ISD::OR) || 1071 (Op2 == ISD::SETLT && Opcode == ISD::OR))) 1072 return getSetCC(Op2, VT, 1073 getNode(ISD::OR, LR.getValueType(), LL, RL), LR); 1074 1075 if (cast<ConstantSDNode>(LR)->isAllOnesValue()) { 1076 // (X == -1) & (Y == -1) -> (X&Y == -1) 1077 // (X != -1) | (Y != -1) -> (X&Y != -1) 1078 if ((Opcode == ISD::AND && Op2 == ISD::SETEQ) || 1079 (Opcode == ISD::OR && Op2 == ISD::SETNE)) 1080 return getSetCC(Op2, VT, 1081 getNode(ISD::AND, LR.getValueType(), LL, RL), LR); 1082 // (X > -1) & (Y > -1) -> (X|Y > -1) 1083 if (Opcode == ISD::AND && Op2 == ISD::SETGT) 1084 return getSetCC(Op2, VT, 1085 getNode(ISD::OR, LR.getValueType(), LL, RL), LR); 1086 } 1087 } 1088 1089 // (X op1 Y) | (Y op2 X) -> (X op1 Y) | (X swapop2 Y) 1090 if (LL == RR && LR == RL) { 1091 Op2 = ISD::getSetCCSwappedOperands(Op2); 1092 goto MatchedBackwards; 1093 } 1094 1095 if (LL == RL && LR == RR) { 1096 MatchedBackwards: 1097 ISD::CondCode Result; 1098 bool isInteger = MVT::isInteger(LL.getValueType()); 1099 if (Opcode == ISD::OR) 1100 Result = ISD::getSetCCOrOperation(LHS->getCondition(), Op2, 1101 isInteger); 1102 else 1103 Result = ISD::getSetCCAndOperation(LHS->getCondition(), Op2, 1104 isInteger); 1105 if (Result != ISD::SETCC_INVALID) 1106 return getSetCC(Result, LHS->getValueType(0), LL, LR); 1107 } 1108 } 1109 1110 // and/or zext(a), zext(b) -> zext(and/or a, b) 1111 if (N1.getOpcode() == ISD::ZERO_EXTEND && 1112 N2.getOpcode() == ISD::ZERO_EXTEND && 1113 N1.getOperand(0).getValueType() == N2.getOperand(0).getValueType()) 1114 return getNode(ISD::ZERO_EXTEND, VT, 1115 getNode(Opcode, N1.getOperand(0).getValueType(), 1116 N1.getOperand(0), N2.getOperand(0))); 1117 break; 1118 case ISD::XOR: 1119 if (N1 == N2) return getConstant(0, VT); // xor X, Y -> 0 1120 break; 1121 case ISD::ADD: 1122 if (N2.getOpcode() == ISD::FNEG) // (A+ (-B) -> A-B 1123 return getNode(ISD::SUB, VT, N1, N2.getOperand(0)); 1124 if (N1.getOpcode() == ISD::FNEG) // ((-A)+B) -> B-A 1125 return getNode(ISD::SUB, VT, N2, N1.getOperand(0)); 1126 if (N1.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N1.getOperand(0)) && 1127 cast<ConstantSDNode>(N1.getOperand(0))->getValue() == 0) 1128 return getNode(ISD::SUB, VT, N2, N1.getOperand(1)); // (0-A)+B -> B-A 1129 if (N2.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N2.getOperand(0)) && 1130 cast<ConstantSDNode>(N2.getOperand(0))->getValue() == 0) 1131 return getNode(ISD::SUB, VT, N1, N2.getOperand(1)); // A+(0-B) -> A-B 1132 break; 1133 case ISD::SUB: 1134 if (N1.getOpcode() == ISD::ADD) { 1135 if (N1.Val->getOperand(0) == N2) 1136 return N1.Val->getOperand(1); // (A+B)-A == B 1137 if (N1.Val->getOperand(1) == N2) 1138 return N1.Val->getOperand(0); // (A+B)-B == A 1139 } 1140 if (N2.getOpcode() == ISD::FNEG) // (A- (-B) -> A+B 1141 return getNode(ISD::ADD, VT, N1, N2.getOperand(0)); 1142 break; 1143 // FIXME: figure out how to safely handle things like 1144 // int foo(int x) { return 1 << (x & 255); } 1145 // int bar() { return foo(256); } 1146#if 0 1147 case ISD::SHL: 1148 case ISD::SRL: 1149 case ISD::SRA: 1150 if (N2.getOpcode() == ISD::SIGN_EXTEND_INREG && 1151 cast<MVTSDNode>(N2)->getExtraValueType() != MVT::i1) 1152 return getNode(Opcode, VT, N1, N2.getOperand(0)); 1153 else if (N2.getOpcode() == ISD::AND) 1154 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N2.getOperand(1))) { 1155 // If the and is only masking out bits that cannot effect the shift, 1156 // eliminate the and. 1157 unsigned NumBits = MVT::getSizeInBits(VT); 1158 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 1159 return getNode(Opcode, VT, N1, N2.getOperand(0)); 1160 } 1161 break; 1162#endif 1163 } 1164 1165 SDNode *&N = BinaryOps[std::make_pair(Opcode, std::make_pair(N1, N2))]; 1166 if (N) return SDOperand(N, 0); 1167 N = new SDNode(Opcode, N1, N2); 1168 N->setValueTypes(VT); 1169 1170 AllNodes.push_back(N); 1171 return SDOperand(N, 0); 1172} 1173 1174SDOperand SelectionDAG::getLoad(MVT::ValueType VT, 1175 SDOperand Chain, SDOperand Ptr) { 1176 SDNode *&N = Loads[std::make_pair(Ptr, std::make_pair(Chain, VT))]; 1177 if (N) return SDOperand(N, 0); 1178 N = new SDNode(ISD::LOAD, Chain, Ptr); 1179 1180 // Loads have a token chain. 1181 N->setValueTypes(VT, MVT::Other); 1182 AllNodes.push_back(N); 1183 return SDOperand(N, 0); 1184} 1185 1186 1187SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1188 SDOperand N1, SDOperand N2, SDOperand N3) { 1189 // Perform various simplifications. 1190 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val); 1191 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val); 1192 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.Val); 1193 switch (Opcode) { 1194 case ISD::SELECT: 1195 if (N1C) 1196 if (N1C->getValue()) 1197 return N2; // select true, X, Y -> X 1198 else 1199 return N3; // select false, X, Y -> Y 1200 1201 if (N2 == N3) return N2; // select C, X, X -> X 1202 1203 if (VT == MVT::i1) { // Boolean SELECT 1204 if (N2C) { 1205 if (N2C->getValue()) // select C, 1, X -> C | X 1206 return getNode(ISD::OR, VT, N1, N3); 1207 else // select C, 0, X -> ~C & X 1208 return getNode(ISD::AND, VT, 1209 getNode(ISD::XOR, N1.getValueType(), N1, 1210 getConstant(1, N1.getValueType())), N3); 1211 } else if (N3C) { 1212 if (N3C->getValue()) // select C, X, 1 -> ~C | X 1213 return getNode(ISD::OR, VT, 1214 getNode(ISD::XOR, N1.getValueType(), N1, 1215 getConstant(1, N1.getValueType())), N2); 1216 else // select C, X, 0 -> C & X 1217 return getNode(ISD::AND, VT, N1, N2); 1218 } 1219 1220 if (N1 == N2) // X ? X : Y --> X ? 1 : Y --> X | Y 1221 return getNode(ISD::OR, VT, N1, N3); 1222 if (N1 == N3) // X ? Y : X --> X ? Y : 0 --> X & Y 1223 return getNode(ISD::AND, VT, N1, N2); 1224 } 1225 1226 // If this is a selectcc, check to see if we can simplify the result. 1227 if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(N1)) { 1228 if (ConstantFPSDNode *CFP = 1229 dyn_cast<ConstantFPSDNode>(SetCC->getOperand(1))) 1230 if (CFP->getValue() == 0.0) { // Allow either -0.0 or 0.0 1231 // select (setg[te] X, +/-0.0), X, fneg(X) -> fabs 1232 if ((SetCC->getCondition() == ISD::SETGE || 1233 SetCC->getCondition() == ISD::SETGT) && 1234 N2 == SetCC->getOperand(0) && N3.getOpcode() == ISD::FNEG && 1235 N3.getOperand(0) == N2) 1236 return getNode(ISD::FABS, VT, N2); 1237 1238 // select (setl[te] X, +/-0.0), fneg(X), X -> fabs 1239 if ((SetCC->getCondition() == ISD::SETLT || 1240 SetCC->getCondition() == ISD::SETLE) && 1241 N3 == SetCC->getOperand(0) && N2.getOpcode() == ISD::FNEG && 1242 N2.getOperand(0) == N3) 1243 return getNode(ISD::FABS, VT, N3); 1244 } 1245 // select (setlt X, 0), A, 0 -> and (sra X, size(X)-1, A) 1246 if (ConstantSDNode *CN = 1247 dyn_cast<ConstantSDNode>(SetCC->getOperand(1))) 1248 if (CN->getValue() == 0 && N3C && N3C->getValue() == 0) 1249 if (SetCC->getCondition() == ISD::SETLT) { 1250 MVT::ValueType XType = SetCC->getOperand(0).getValueType(); 1251 MVT::ValueType AType = N2.getValueType(); 1252 if (XType >= AType) { 1253 SDOperand Shift = getNode(ISD::SRA, XType, SetCC->getOperand(0), 1254 getConstant(MVT::getSizeInBits(XType)-1, 1255 TLI.getShiftAmountTy())); 1256 if (XType > AType) 1257 Shift = getNode(ISD::TRUNCATE, AType, Shift); 1258 return getNode(ISD::AND, AType, Shift, N2); 1259 } 1260 } 1261 } 1262 break; 1263 case ISD::BRCOND: 1264 if (N2C) 1265 if (N2C->getValue()) // Unconditional branch 1266 return getNode(ISD::BR, MVT::Other, N1, N3); 1267 else 1268 return N1; // Never-taken branch 1269 break; 1270 // FIXME: figure out how to safely handle things like 1271 // int foo(int x) { return 1 << (x & 255); } 1272 // int bar() { return foo(256); } 1273#if 0 1274 case ISD::SRA_PARTS: 1275 case ISD::SRL_PARTS: 1276 case ISD::SHL_PARTS: 1277 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG && 1278 cast<MVTSDNode>(N3)->getExtraValueType() != MVT::i1) 1279 return getNode(Opcode, VT, N1, N2, N3.getOperand(0)); 1280 else if (N3.getOpcode() == ISD::AND) 1281 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) { 1282 // If the and is only masking out bits that cannot effect the shift, 1283 // eliminate the and. 1284 unsigned NumBits = MVT::getSizeInBits(VT)*2; 1285 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 1286 return getNode(Opcode, VT, N1, N2, N3.getOperand(0)); 1287 } 1288 break; 1289#endif 1290 } 1291 1292 SDNode *N = new SDNode(Opcode, N1, N2, N3); 1293 switch (Opcode) { 1294 default: 1295 N->setValueTypes(VT); 1296 break; 1297 case ISD::DYNAMIC_STACKALLOC: // DYNAMIC_STACKALLOC produces pointer and chain 1298 N->setValueTypes(VT, MVT::Other); 1299 break; 1300 1301 case ISD::SRA_PARTS: 1302 case ISD::SRL_PARTS: 1303 case ISD::SHL_PARTS: { 1304 std::vector<MVT::ValueType> V(N->getNumOperands()-1, VT); 1305 N->setValueTypes(V); 1306 break; 1307 } 1308 } 1309 1310 // FIXME: memoize NODES 1311 AllNodes.push_back(N); 1312 return SDOperand(N, 0); 1313} 1314 1315SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, 1316 std::vector<SDOperand> &Children) { 1317 switch (Children.size()) { 1318 case 0: return getNode(Opcode, VT); 1319 case 1: return getNode(Opcode, VT, Children[0]); 1320 case 2: return getNode(Opcode, VT, Children[0], Children[1]); 1321 case 3: return getNode(Opcode, VT, Children[0], Children[1], Children[2]); 1322 default: break; 1323 } 1324 1325 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(Children[1].Val); 1326 switch (Opcode) { 1327 default: break; 1328 case ISD::BRCONDTWOWAY: 1329 if (N1C) 1330 if (N1C->getValue()) // Unconditional branch to true dest. 1331 return getNode(ISD::BR, MVT::Other, Children[0], Children[2]); 1332 else // Unconditional branch to false dest. 1333 return getNode(ISD::BR, MVT::Other, Children[0], Children[3]); 1334 break; 1335 } 1336 1337 // FIXME: MEMOIZE!! 1338 SDNode *N = new SDNode(Opcode, Children); 1339 if (Opcode != ISD::ADD_PARTS && Opcode != ISD::SUB_PARTS) { 1340 N->setValueTypes(VT); 1341 } else { 1342 std::vector<MVT::ValueType> V(N->getNumOperands()/2, VT); 1343 N->setValueTypes(V); 1344 } 1345 AllNodes.push_back(N); 1346 return SDOperand(N, 0); 1347} 1348 1349SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 1350 MVT::ValueType EVT) { 1351 1352 switch (Opcode) { 1353 default: assert(0 && "Bad opcode for this accessor!"); 1354 case ISD::FP_ROUND_INREG: 1355 assert(VT == N1.getValueType() && "Not an inreg round!"); 1356 assert(MVT::isFloatingPoint(VT) && MVT::isFloatingPoint(EVT) && 1357 "Cannot FP_ROUND_INREG integer types"); 1358 if (EVT == VT) return N1; // Not actually rounding 1359 assert(EVT < VT && "Not rounding down!"); 1360 1361 if (isa<ConstantFPSDNode>(N1)) 1362 return getNode(ISD::FP_EXTEND, VT, getNode(ISD::FP_ROUND, EVT, N1)); 1363 break; 1364 case ISD::SIGN_EXTEND_INREG: 1365 assert(VT == N1.getValueType() && "Not an inreg extend!"); 1366 assert(MVT::isInteger(VT) && MVT::isInteger(EVT) && 1367 "Cannot *_EXTEND_INREG FP types"); 1368 if (EVT == VT) return N1; // Not actually extending 1369 assert(EVT < VT && "Not extending!"); 1370 1371 // Extending a constant? Just return the extended constant. 1372 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) { 1373 SDOperand Tmp = getNode(ISD::TRUNCATE, EVT, N1); 1374 return getNode(ISD::SIGN_EXTEND, VT, Tmp); 1375 } 1376 1377 // If we are sign extending an extension, use the original source. 1378 if (N1.getOpcode() == ISD::SIGN_EXTEND_INREG) 1379 if (cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) 1380 return N1; 1381 1382 // If we are sign extending a sextload, return just the load. 1383 if (N1.getOpcode() == ISD::SEXTLOAD && Opcode == ISD::SIGN_EXTEND_INREG) 1384 if (cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) 1385 return N1; 1386 1387 // If we are extending the result of a setcc, and we already know the 1388 // contents of the top bits, eliminate the extension. 1389 if (N1.getOpcode() == ISD::SETCC && 1390 TLI.getSetCCResultContents() == 1391 TargetLowering::ZeroOrNegativeOneSetCCResult) 1392 return N1; 1393 1394 // If we are sign extending the result of an (and X, C) operation, and we 1395 // know the extended bits are zeros already, don't do the extend. 1396 if (N1.getOpcode() == ISD::AND) 1397 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getOperand(1))) { 1398 uint64_t Mask = N1C->getValue(); 1399 unsigned NumBits = MVT::getSizeInBits(EVT); 1400 if ((Mask & (~0ULL << (NumBits-1))) == 0) 1401 return N1; 1402 } 1403 break; 1404 } 1405 1406 EVTStruct NN; 1407 NN.Opcode = Opcode; 1408 NN.VT = VT; 1409 NN.EVT = EVT; 1410 NN.Ops.push_back(N1); 1411 1412 SDNode *&N = MVTSDNodes[NN]; 1413 if (N) return SDOperand(N, 0); 1414 N = new MVTSDNode(Opcode, VT, N1, EVT); 1415 AllNodes.push_back(N); 1416 return SDOperand(N, 0); 1417} 1418 1419SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 1420 SDOperand N2, MVT::ValueType EVT) { 1421 switch (Opcode) { 1422 default: assert(0 && "Bad opcode for this accessor!"); 1423 case ISD::EXTLOAD: 1424 case ISD::SEXTLOAD: 1425 case ISD::ZEXTLOAD: 1426 // If they are asking for an extending load from/to the same thing, return a 1427 // normal load. 1428 if (VT == EVT) 1429 return getNode(ISD::LOAD, VT, N1, N2); 1430 assert(EVT < VT && "Should only be an extending load, not truncating!"); 1431 assert((Opcode == ISD::EXTLOAD || MVT::isInteger(VT)) && 1432 "Cannot sign/zero extend a FP load!"); 1433 assert(MVT::isInteger(VT) == MVT::isInteger(EVT) && 1434 "Cannot convert from FP to Int or Int -> FP!"); 1435 break; 1436 } 1437 1438 EVTStruct NN; 1439 NN.Opcode = Opcode; 1440 NN.VT = VT; 1441 NN.EVT = EVT; 1442 NN.Ops.push_back(N1); 1443 NN.Ops.push_back(N2); 1444 1445 SDNode *&N = MVTSDNodes[NN]; 1446 if (N) return SDOperand(N, 0); 1447 N = new MVTSDNode(Opcode, VT, MVT::Other, N1, N2, EVT); 1448 AllNodes.push_back(N); 1449 return SDOperand(N, 0); 1450} 1451 1452SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, 1453 SDOperand N2, SDOperand N3, MVT::ValueType EVT) { 1454 switch (Opcode) { 1455 default: assert(0 && "Bad opcode for this accessor!"); 1456 case ISD::TRUNCSTORE: 1457#if 0 // FIXME: If the target supports EVT natively, convert to a truncate/store 1458 // If this is a truncating store of a constant, convert to the desired type 1459 // and store it instead. 1460 if (isa<Constant>(N1)) { 1461 SDOperand Op = getNode(ISD::TRUNCATE, EVT, N1); 1462 if (isa<Constant>(Op)) 1463 N1 = Op; 1464 } 1465 // Also for ConstantFP? 1466#endif 1467 if (N1.getValueType() == EVT) // Normal store? 1468 return getNode(ISD::STORE, VT, N1, N2, N3); 1469 assert(N2.getValueType() > EVT && "Not a truncation?"); 1470 assert(MVT::isInteger(N2.getValueType()) == MVT::isInteger(EVT) && 1471 "Can't do FP-INT conversion!"); 1472 break; 1473 } 1474 1475 EVTStruct NN; 1476 NN.Opcode = Opcode; 1477 NN.VT = VT; 1478 NN.EVT = EVT; 1479 NN.Ops.push_back(N1); 1480 NN.Ops.push_back(N2); 1481 NN.Ops.push_back(N3); 1482 1483 SDNode *&N = MVTSDNodes[NN]; 1484 if (N) return SDOperand(N, 0); 1485 N = new MVTSDNode(Opcode, VT, N1, N2, N3, EVT); 1486 AllNodes.push_back(N); 1487 return SDOperand(N, 0); 1488} 1489 1490 1491/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 1492/// indicated value. This method ignores uses of other values defined by this 1493/// operation. 1494bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) { 1495 assert(Value < getNumValues() && "Bad value!"); 1496 1497 // If there is only one value, this is easy. 1498 if (getNumValues() == 1) 1499 return use_size() == NUses; 1500 if (Uses.size() < NUses) return false; 1501 1502 SDOperand TheValue(this, Value); 1503 1504 std::set<SDNode*> UsersHandled; 1505 1506 for (std::vector<SDNode*>::iterator UI = Uses.begin(), E = Uses.end(); 1507 UI != E; ++UI) { 1508 SDNode *User = *UI; 1509 if (User->getNumOperands() == 1 || 1510 UsersHandled.insert(User).second) // First time we've seen this? 1511 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) 1512 if (User->getOperand(i) == TheValue) { 1513 if (NUses == 0) 1514 return false; // too many uses 1515 --NUses; 1516 } 1517 } 1518 1519 // Found exactly the right number of uses? 1520 return NUses == 0; 1521} 1522 1523 1524const char *SDNode::getOperationName() const { 1525 switch (getOpcode()) { 1526 default: return "<<Unknown>>"; 1527 case ISD::PCMARKER: return "PCMarker"; 1528 case ISD::EntryToken: return "EntryToken"; 1529 case ISD::TokenFactor: return "TokenFactor"; 1530 case ISD::Constant: return "Constant"; 1531 case ISD::ConstantFP: return "ConstantFP"; 1532 case ISD::GlobalAddress: return "GlobalAddress"; 1533 case ISD::FrameIndex: return "FrameIndex"; 1534 case ISD::BasicBlock: return "BasicBlock"; 1535 case ISD::ExternalSymbol: return "ExternalSymbol"; 1536 case ISD::ConstantPool: return "ConstantPoolIndex"; 1537 case ISD::CopyToReg: return "CopyToReg"; 1538 case ISD::CopyFromReg: return "CopyFromReg"; 1539 case ISD::ImplicitDef: return "ImplicitDef"; 1540 case ISD::UNDEF: return "undef"; 1541 1542 // Unary operators 1543 case ISD::FABS: return "fabs"; 1544 case ISD::FNEG: return "fneg"; 1545 1546 // Binary operators 1547 case ISD::ADD: return "add"; 1548 case ISD::SUB: return "sub"; 1549 case ISD::MUL: return "mul"; 1550 case ISD::MULHU: return "mulhu"; 1551 case ISD::MULHS: return "mulhs"; 1552 case ISD::SDIV: return "sdiv"; 1553 case ISD::UDIV: return "udiv"; 1554 case ISD::SREM: return "srem"; 1555 case ISD::UREM: return "urem"; 1556 case ISD::AND: return "and"; 1557 case ISD::OR: return "or"; 1558 case ISD::XOR: return "xor"; 1559 case ISD::SHL: return "shl"; 1560 case ISD::SRA: return "sra"; 1561 case ISD::SRL: return "srl"; 1562 1563 case ISD::SELECT: return "select"; 1564 case ISD::ADD_PARTS: return "add_parts"; 1565 case ISD::SUB_PARTS: return "sub_parts"; 1566 case ISD::SHL_PARTS: return "shl_parts"; 1567 case ISD::SRA_PARTS: return "sra_parts"; 1568 case ISD::SRL_PARTS: return "srl_parts"; 1569 1570 // Conversion operators. 1571 case ISD::SIGN_EXTEND: return "sign_extend"; 1572 case ISD::ZERO_EXTEND: return "zero_extend"; 1573 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg"; 1574 case ISD::TRUNCATE: return "truncate"; 1575 case ISD::FP_ROUND: return "fp_round"; 1576 case ISD::FP_ROUND_INREG: return "fp_round_inreg"; 1577 case ISD::FP_EXTEND: return "fp_extend"; 1578 1579 case ISD::SINT_TO_FP: return "sint_to_fp"; 1580 case ISD::UINT_TO_FP: return "uint_to_fp"; 1581 case ISD::FP_TO_SINT: return "fp_to_sint"; 1582 case ISD::FP_TO_UINT: return "fp_to_uint"; 1583 1584 // Control flow instructions 1585 case ISD::BR: return "br"; 1586 case ISD::BRCOND: return "brcond"; 1587 case ISD::BRCONDTWOWAY: return "brcondtwoway"; 1588 case ISD::RET: return "ret"; 1589 case ISD::CALL: return "call"; 1590 case ISD::ADJCALLSTACKDOWN: return "adjcallstackdown"; 1591 case ISD::ADJCALLSTACKUP: return "adjcallstackup"; 1592 1593 // Other operators 1594 case ISD::LOAD: return "load"; 1595 case ISD::STORE: return "store"; 1596 case ISD::EXTLOAD: return "extload"; 1597 case ISD::SEXTLOAD: return "sextload"; 1598 case ISD::ZEXTLOAD: return "zextload"; 1599 case ISD::TRUNCSTORE: return "truncstore"; 1600 1601 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc"; 1602 case ISD::EXTRACT_ELEMENT: return "extract_element"; 1603 case ISD::BUILD_PAIR: return "build_pair"; 1604 case ISD::MEMSET: return "memset"; 1605 case ISD::MEMCPY: return "memcpy"; 1606 case ISD::MEMMOVE: return "memmove"; 1607 1608 case ISD::SETCC: 1609 const SetCCSDNode *SetCC = cast<SetCCSDNode>(this); 1610 switch (SetCC->getCondition()) { 1611 default: assert(0 && "Unknown setcc condition!"); 1612 case ISD::SETOEQ: return "setcc:setoeq"; 1613 case ISD::SETOGT: return "setcc:setogt"; 1614 case ISD::SETOGE: return "setcc:setoge"; 1615 case ISD::SETOLT: return "setcc:setolt"; 1616 case ISD::SETOLE: return "setcc:setole"; 1617 case ISD::SETONE: return "setcc:setone"; 1618 1619 case ISD::SETO: return "setcc:seto"; 1620 case ISD::SETUO: return "setcc:setuo"; 1621 case ISD::SETUEQ: return "setcc:setue"; 1622 case ISD::SETUGT: return "setcc:setugt"; 1623 case ISD::SETUGE: return "setcc:setuge"; 1624 case ISD::SETULT: return "setcc:setult"; 1625 case ISD::SETULE: return "setcc:setule"; 1626 case ISD::SETUNE: return "setcc:setune"; 1627 1628 case ISD::SETEQ: return "setcc:seteq"; 1629 case ISD::SETGT: return "setcc:setgt"; 1630 case ISD::SETGE: return "setcc:setge"; 1631 case ISD::SETLT: return "setcc:setlt"; 1632 case ISD::SETLE: return "setcc:setle"; 1633 case ISD::SETNE: return "setcc:setne"; 1634 } 1635 } 1636} 1637 1638void SDNode::dump() const { 1639 std::cerr << (void*)this << ": "; 1640 1641 for (unsigned i = 0, e = getNumValues(); i != e; ++i) { 1642 if (i) std::cerr << ","; 1643 if (getValueType(i) == MVT::Other) 1644 std::cerr << "ch"; 1645 else 1646 std::cerr << MVT::getValueTypeString(getValueType(i)); 1647 } 1648 std::cerr << " = " << getOperationName(); 1649 1650 std::cerr << " "; 1651 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1652 if (i) std::cerr << ", "; 1653 std::cerr << (void*)getOperand(i).Val; 1654 if (unsigned RN = getOperand(i).ResNo) 1655 std::cerr << ":" << RN; 1656 } 1657 1658 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) { 1659 std::cerr << "<" << CSDN->getValue() << ">"; 1660 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) { 1661 std::cerr << "<" << CSDN->getValue() << ">"; 1662 } else if (const GlobalAddressSDNode *GADN = 1663 dyn_cast<GlobalAddressSDNode>(this)) { 1664 std::cerr << "<"; 1665 WriteAsOperand(std::cerr, GADN->getGlobal()) << ">"; 1666 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) { 1667 std::cerr << "<" << FIDN->getIndex() << ">"; 1668 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){ 1669 std::cerr << "<" << CP->getIndex() << ">"; 1670 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) { 1671 std::cerr << "<"; 1672 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock(); 1673 if (LBB) 1674 std::cerr << LBB->getName() << " "; 1675 std::cerr << (const void*)BBDN->getBasicBlock() << ">"; 1676 } else if (const RegSDNode *C2V = dyn_cast<RegSDNode>(this)) { 1677 std::cerr << "<reg #" << C2V->getReg() << ">"; 1678 } else if (const ExternalSymbolSDNode *ES = 1679 dyn_cast<ExternalSymbolSDNode>(this)) { 1680 std::cerr << "'" << ES->getSymbol() << "'"; 1681 } else if (const MVTSDNode *M = dyn_cast<MVTSDNode>(this)) { 1682 std::cerr << " - Ty = " << MVT::getValueTypeString(M->getExtraValueType()); 1683 } 1684} 1685 1686static void DumpNodes(SDNode *N, unsigned indent) { 1687 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 1688 if (N->getOperand(i).Val->hasOneUse()) 1689 DumpNodes(N->getOperand(i).Val, indent+2); 1690 else 1691 std::cerr << "\n" << std::string(indent+2, ' ') 1692 << (void*)N->getOperand(i).Val << ": <multiple use>"; 1693 1694 1695 std::cerr << "\n" << std::string(indent, ' '); 1696 N->dump(); 1697} 1698 1699void SelectionDAG::dump() const { 1700 std::cerr << "SelectionDAG has " << AllNodes.size() << " nodes:"; 1701 std::vector<SDNode*> Nodes(AllNodes); 1702 std::sort(Nodes.begin(), Nodes.end()); 1703 1704 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 1705 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val) 1706 DumpNodes(Nodes[i], 2); 1707 } 1708 1709 DumpNodes(getRoot().Val, 2); 1710 1711 std::cerr << "\n\n"; 1712} 1713 1714