ARMISelDAGToDAG.cpp revision 8c1a73ad3ffbc121a251b93b0fb4e64187f90645
1//===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines an instruction selector for the ARM target. 11// 12//===----------------------------------------------------------------------===// 13 14#include "ARM.h" 15#include "ARMISelLowering.h" 16#include "ARMTargetMachine.h" 17#include "ARMAddressingModes.h" 18#include "llvm/CallingConv.h" 19#include "llvm/Constants.h" 20#include "llvm/DerivedTypes.h" 21#include "llvm/Function.h" 22#include "llvm/Intrinsics.h" 23#include "llvm/CodeGen/MachineFrameInfo.h" 24#include "llvm/CodeGen/MachineFunction.h" 25#include "llvm/CodeGen/MachineInstrBuilder.h" 26#include "llvm/CodeGen/SelectionDAG.h" 27#include "llvm/CodeGen/SelectionDAGISel.h" 28#include "llvm/CodeGen/SSARegMap.h" 29#include "llvm/Target/TargetLowering.h" 30#include "llvm/Support/Debug.h" 31#include <iostream> 32using namespace llvm; 33 34//===--------------------------------------------------------------------===// 35/// ARMDAGToDAGISel - ARM specific code to select ARM machine 36/// instructions for SelectionDAG operations. 37/// 38namespace { 39class ARMDAGToDAGISel : public SelectionDAGISel { 40 ARMTargetLowering Lowering; 41 42 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can 43 /// make the right decision when generating code for different targets. 44 const ARMSubtarget *Subtarget; 45 46public: 47 ARMDAGToDAGISel(ARMTargetMachine &TM) 48 : SelectionDAGISel(Lowering), Lowering(TM), 49 Subtarget(&TM.getSubtarget<ARMSubtarget>()) { 50 } 51 52 virtual const char *getPassName() const { 53 return "ARM Instruction Selection"; 54 } 55 56 SDNode *Select(SDOperand Op); 57 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); 58 bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Base, 59 SDOperand &Offset, SDOperand &Opc); 60 bool SelectAddrMode2Offset(SDOperand Op, SDOperand N, 61 SDOperand &Offset, SDOperand &Opc); 62 bool SelectAddrMode3(SDOperand Op, SDOperand N, SDOperand &Base, 63 SDOperand &Offset, SDOperand &Opc); 64 bool SelectAddrMode3Offset(SDOperand Op, SDOperand N, 65 SDOperand &Offset, SDOperand &Opc); 66 bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Base, 67 SDOperand &Offset); 68 69 bool SelectAddrModePC(SDOperand Op, SDOperand N, SDOperand &Offset, 70 SDOperand &Label); 71 72 bool SelectThumbAddrModeRR(SDOperand Op, SDOperand N, SDOperand &Base, 73 SDOperand &Offset); 74 bool SelectThumbAddrModeRI5(SDOperand Op, SDOperand N, unsigned Scale, 75 SDOperand &Base, SDOperand &OffImm, 76 SDOperand &Offset); 77 bool SelectThumbAddrModeS1(SDOperand Op, SDOperand N, SDOperand &Base, 78 SDOperand &OffImm, SDOperand &Offset); 79 bool SelectThumbAddrModeS2(SDOperand Op, SDOperand N, SDOperand &Base, 80 SDOperand &OffImm, SDOperand &Offset); 81 bool SelectThumbAddrModeS4(SDOperand Op, SDOperand N, SDOperand &Base, 82 SDOperand &OffImm, SDOperand &Offset); 83 bool SelectThumbAddrModeSP(SDOperand Op, SDOperand N, SDOperand &Base, 84 SDOperand &OffImm); 85 86 bool SelectShifterOperandReg(SDOperand Op, SDOperand N, SDOperand &A, 87 SDOperand &B, SDOperand &C); 88 89 // Include the pieces autogenerated from the target description. 90#include "ARMGenDAGISel.inc" 91}; 92} 93 94void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) { 95 DEBUG(BB->dump()); 96 97 DAG.setRoot(SelectRoot(DAG.getRoot())); 98 DAG.RemoveDeadNodes(); 99 100 ScheduleAndEmitDAG(DAG); 101} 102 103bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N, 104 SDOperand &Base, SDOperand &Offset, 105 SDOperand &Opc) { 106 if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB) { 107 Base = N; 108 if (N.getOpcode() == ISD::FrameIndex) { 109 int FI = cast<FrameIndexSDNode>(N)->getIndex(); 110 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 111 } else if (N.getOpcode() == ARMISD::Wrapper) { 112 Base = N.getOperand(0); 113 } 114 Offset = CurDAG->getRegister(0, MVT::i32); 115 Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(ARM_AM::add, 0, 116 ARM_AM::no_shift), 117 MVT::i32); 118 return true; 119 } 120 121 // Match simple R +/- imm12 operands. 122 if (N.getOpcode() == ISD::ADD) 123 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 124 int RHSC = (int)RHS->getValue(); 125 if ((RHSC >= 0 && RHSC < 0x1000) || 126 (RHSC < 0 && RHSC > -0x1000)) { // 12 bits. 127 Base = N.getOperand(0); 128 if (Base.getOpcode() == ISD::FrameIndex) { 129 int FI = cast<FrameIndexSDNode>(Base)->getIndex(); 130 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 131 } 132 Offset = CurDAG->getRegister(0, MVT::i32); 133 134 ARM_AM::AddrOpc AddSub = ARM_AM::add; 135 if (RHSC < 0) { 136 AddSub = ARM_AM::sub; 137 RHSC = - RHSC; 138 } 139 Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, RHSC, 140 ARM_AM::no_shift), 141 MVT::i32); 142 return true; 143 } 144 } 145 146 // Otherwise this is R +/- [possibly shifted] R 147 ARM_AM::AddrOpc AddSub = N.getOpcode() == ISD::ADD ? ARM_AM::add:ARM_AM::sub; 148 ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(1)); 149 unsigned ShAmt = 0; 150 151 Base = N.getOperand(0); 152 Offset = N.getOperand(1); 153 154 if (ShOpcVal != ARM_AM::no_shift) { 155 // Check to see if the RHS of the shift is a constant, if not, we can't fold 156 // it. 157 if (ConstantSDNode *Sh = 158 dyn_cast<ConstantSDNode>(N.getOperand(1).getOperand(1))) { 159 ShAmt = Sh->getValue(); 160 Offset = N.getOperand(1).getOperand(0); 161 } else { 162 ShOpcVal = ARM_AM::no_shift; 163 } 164 } 165 166 // Try matching (R shl C) + (R). 167 if (N.getOpcode() == ISD::ADD && ShOpcVal == ARM_AM::no_shift) { 168 ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(0)); 169 if (ShOpcVal != ARM_AM::no_shift) { 170 // Check to see if the RHS of the shift is a constant, if not, we can't 171 // fold it. 172 if (ConstantSDNode *Sh = 173 dyn_cast<ConstantSDNode>(N.getOperand(0).getOperand(1))) { 174 ShAmt = Sh->getValue(); 175 Offset = N.getOperand(0).getOperand(0); 176 Base = N.getOperand(1); 177 } else { 178 ShOpcVal = ARM_AM::no_shift; 179 } 180 } 181 } 182 183 Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal), 184 MVT::i32); 185 return true; 186} 187 188bool ARMDAGToDAGISel::SelectAddrMode2Offset(SDOperand Op, SDOperand N, 189 SDOperand &Offset, SDOperand &Opc) { 190 unsigned Opcode = Op.getOpcode(); 191 ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) 192 ? cast<LoadSDNode>(Op)->getAddressingMode() 193 : cast<StoreSDNode>(Op)->getAddressingMode(); 194 ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) 195 ? ARM_AM::add : ARM_AM::sub; 196 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) { 197 int Val = (int)C->getValue(); 198 if (Val >= 0 && Val < 0x1000) { // 12 bits. 199 Offset = CurDAG->getRegister(0, MVT::i32); 200 Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, Val, 201 ARM_AM::no_shift), 202 MVT::i32); 203 return true; 204 } 205 } 206 207 Offset = N; 208 ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N); 209 unsigned ShAmt = 0; 210 if (ShOpcVal != ARM_AM::no_shift) { 211 // Check to see if the RHS of the shift is a constant, if not, we can't fold 212 // it. 213 if (ConstantSDNode *Sh = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 214 ShAmt = Sh->getValue(); 215 Offset = N.getOperand(0); 216 } else { 217 ShOpcVal = ARM_AM::no_shift; 218 } 219 } 220 221 Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal), 222 MVT::i32); 223 return true; 224} 225 226 227bool ARMDAGToDAGISel::SelectAddrMode3(SDOperand Op, SDOperand N, 228 SDOperand &Base, SDOperand &Offset, 229 SDOperand &Opc) { 230 if (N.getOpcode() == ISD::SUB) { 231 // X - C is canonicalize to X + -C, no need to handle it here. 232 Base = N.getOperand(0); 233 Offset = N.getOperand(1); 234 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::sub, 0),MVT::i32); 235 return true; 236 } 237 238 if (N.getOpcode() != ISD::ADD) { 239 Base = N; 240 if (N.getOpcode() == ISD::FrameIndex) { 241 int FI = cast<FrameIndexSDNode>(N)->getIndex(); 242 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 243 } 244 Offset = CurDAG->getRegister(0, MVT::i32); 245 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0),MVT::i32); 246 return true; 247 } 248 249 // If the RHS is +/- imm8, fold into addr mode. 250 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 251 int RHSC = (int)RHS->getValue(); 252 if ((RHSC >= 0 && RHSC < 256) || 253 (RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed. 254 Base = N.getOperand(0); 255 if (Base.getOpcode() == ISD::FrameIndex) { 256 int FI = cast<FrameIndexSDNode>(Base)->getIndex(); 257 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 258 } 259 Offset = CurDAG->getRegister(0, MVT::i32); 260 261 ARM_AM::AddrOpc AddSub = ARM_AM::add; 262 if (RHSC < 0) { 263 AddSub = ARM_AM::sub; 264 RHSC = - RHSC; 265 } 266 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, RHSC),MVT::i32); 267 return true; 268 } 269 } 270 271 Base = N.getOperand(0); 272 Offset = N.getOperand(1); 273 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), MVT::i32); 274 return true; 275} 276 277bool ARMDAGToDAGISel::SelectAddrMode3Offset(SDOperand Op, SDOperand N, 278 SDOperand &Offset, SDOperand &Opc) { 279 unsigned Opcode = Op.getOpcode(); 280 ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) 281 ? cast<LoadSDNode>(Op)->getAddressingMode() 282 : cast<StoreSDNode>(Op)->getAddressingMode(); 283 ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) 284 ? ARM_AM::add : ARM_AM::sub; 285 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) { 286 int Val = (int)C->getValue(); 287 if (Val >= 0 && Val < 256) { 288 Offset = CurDAG->getRegister(0, MVT::i32); 289 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, Val), MVT::i32); 290 return true; 291 } 292 } 293 294 Offset = N; 295 Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, 0), MVT::i32); 296 return true; 297} 298 299 300bool ARMDAGToDAGISel::SelectAddrMode5(SDOperand Op, SDOperand N, 301 SDOperand &Base, SDOperand &Offset) { 302 if (N.getOpcode() != ISD::ADD) { 303 Base = N; 304 if (N.getOpcode() == ISD::FrameIndex) { 305 int FI = cast<FrameIndexSDNode>(N)->getIndex(); 306 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 307 } else if (N.getOpcode() == ARMISD::Wrapper) { 308 Base = N.getOperand(0); 309 } 310 Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0), 311 MVT::i32); 312 return true; 313 } 314 315 // If the RHS is +/- imm8, fold into addr mode. 316 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 317 int RHSC = (int)RHS->getValue(); 318 if ((RHSC & 3) == 0) { // The constant is implicitly multiplied by 4. 319 RHSC >>= 2; 320 if ((RHSC >= 0 && RHSC < 256) || 321 (RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed. 322 Base = N.getOperand(0); 323 if (Base.getOpcode() == ISD::FrameIndex) { 324 int FI = cast<FrameIndexSDNode>(Base)->getIndex(); 325 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 326 } 327 328 ARM_AM::AddrOpc AddSub = ARM_AM::add; 329 if (RHSC < 0) { 330 AddSub = ARM_AM::sub; 331 RHSC = - RHSC; 332 } 333 Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(AddSub, RHSC), 334 MVT::i32); 335 return true; 336 } 337 } 338 } 339 340 Base = N; 341 Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0), 342 MVT::i32); 343 return true; 344} 345 346bool ARMDAGToDAGISel::SelectAddrModePC(SDOperand Op, SDOperand N, 347 SDOperand &Offset, SDOperand &Label) { 348 if (N.getOpcode() == ARMISD::PIC_ADD && N.hasOneUse()) { 349 Offset = N.getOperand(0); 350 SDOperand N1 = N.getOperand(1); 351 Label = CurDAG->getTargetConstant(cast<ConstantSDNode>(N1)->getValue(), 352 MVT::i32); 353 return true; 354 } 355 return false; 356} 357 358bool ARMDAGToDAGISel::SelectThumbAddrModeRR(SDOperand Op, SDOperand N, 359 SDOperand &Base, SDOperand &Offset){ 360 if (N.getOpcode() != ISD::ADD) { 361 Base = N; 362 // We must materialize a zero in a reg! Returning an constant here won't 363 // work since its node is -1 so it won't get added to the selection queue. 364 // Explicitly issue a tMOVri8 node! 365 Offset = SDOperand(CurDAG->getTargetNode(ARM::tMOVri8, MVT::i32, 366 CurDAG->getTargetConstant(0, MVT::i32)), 0); 367 return true; 368 } 369 370 Base = N.getOperand(0); 371 Offset = N.getOperand(1); 372 return true; 373} 374 375bool 376ARMDAGToDAGISel::SelectThumbAddrModeRI5(SDOperand Op, SDOperand N, 377 unsigned Scale, SDOperand &Base, 378 SDOperand &OffImm, SDOperand &Offset) { 379 if (Scale == 4) { 380 SDOperand TmpBase, TmpOffImm; 381 if (SelectThumbAddrModeSP(Op, N, TmpBase, TmpOffImm)) 382 return false; // We want to select tLDRspi / tSTRspi instead. 383 if (N.getOpcode() == ARMISD::Wrapper && 384 N.getOperand(0).getOpcode() == ISD::TargetConstantPool) 385 return false; // We want to select tLDRpci instead. 386 } 387 388 if (N.getOpcode() != ISD::ADD) { 389 Base = (N.getOpcode() == ARMISD::Wrapper) ? N.getOperand(0) : N; 390 Offset = CurDAG->getRegister(0, MVT::i32); 391 OffImm = CurDAG->getTargetConstant(0, MVT::i32); 392 return true; 393 } 394 395 // Thumb does not have [sp, r] address mode. 396 RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(N.getOperand(0)); 397 RegisterSDNode *RHSR = dyn_cast<RegisterSDNode>(N.getOperand(1)); 398 if ((LHSR && LHSR->getReg() == ARM::SP) || 399 (RHSR && RHSR->getReg() == ARM::SP)) { 400 Base = N; 401 Offset = CurDAG->getRegister(0, MVT::i32); 402 OffImm = CurDAG->getTargetConstant(0, MVT::i32); 403 return true; 404 } 405 406 // If the RHS is + imm5 * scale, fold into addr mode. 407 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 408 int RHSC = (int)RHS->getValue(); 409 if ((RHSC & (Scale-1)) == 0) { // The constant is implicitly multiplied. 410 RHSC /= Scale; 411 if (RHSC >= 0 && RHSC < 32) { 412 Base = N.getOperand(0); 413 Offset = CurDAG->getRegister(0, MVT::i32); 414 OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32); 415 return true; 416 } 417 } 418 } 419 420 Base = N.getOperand(0); 421 Offset = N.getOperand(1); 422 OffImm = CurDAG->getTargetConstant(0, MVT::i32); 423 return true; 424} 425 426bool ARMDAGToDAGISel::SelectThumbAddrModeS1(SDOperand Op, SDOperand N, 427 SDOperand &Base, SDOperand &OffImm, 428 SDOperand &Offset) { 429 return SelectThumbAddrModeRI5(Op, N, 1, Base, OffImm, Offset); 430} 431 432bool ARMDAGToDAGISel::SelectThumbAddrModeS2(SDOperand Op, SDOperand N, 433 SDOperand &Base, SDOperand &OffImm, 434 SDOperand &Offset) { 435 return SelectThumbAddrModeRI5(Op, N, 2, Base, OffImm, Offset); 436} 437 438bool ARMDAGToDAGISel::SelectThumbAddrModeS4(SDOperand Op, SDOperand N, 439 SDOperand &Base, SDOperand &OffImm, 440 SDOperand &Offset) { 441 return SelectThumbAddrModeRI5(Op, N, 4, Base, OffImm, Offset); 442} 443 444bool ARMDAGToDAGISel::SelectThumbAddrModeSP(SDOperand Op, SDOperand N, 445 SDOperand &Base, SDOperand &OffImm) { 446 if (N.getOpcode() == ISD::FrameIndex) { 447 int FI = cast<FrameIndexSDNode>(N)->getIndex(); 448 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 449 OffImm = CurDAG->getTargetConstant(0, MVT::i32); 450 return true; 451 } 452 453 if (N.getOpcode() != ISD::ADD) 454 return false; 455 456 RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(N.getOperand(0)); 457 if (N.getOperand(0).getOpcode() == ISD::FrameIndex || 458 (LHSR && LHSR->getReg() == ARM::SP)) { 459 // If the RHS is + imm8 * scale, fold into addr mode. 460 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 461 int RHSC = (int)RHS->getValue(); 462 if ((RHSC & 3) == 0) { // The constant is implicitly multiplied. 463 RHSC >>= 2; 464 if (RHSC >= 0 && RHSC < 256) { 465 Base = N.getOperand(0); 466 if (Base.getOpcode() == ISD::FrameIndex) { 467 int FI = cast<FrameIndexSDNode>(Base)->getIndex(); 468 Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 469 } 470 OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32); 471 return true; 472 } 473 } 474 } 475 } 476 477 return false; 478} 479 480bool ARMDAGToDAGISel::SelectShifterOperandReg(SDOperand Op, 481 SDOperand N, 482 SDOperand &BaseReg, 483 SDOperand &ShReg, 484 SDOperand &Opc) { 485 ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N); 486 487 // Don't match base register only case. That is matched to a separate 488 // lower complexity pattern with explicit register operand. 489 if (ShOpcVal == ARM_AM::no_shift) return false; 490 491 BaseReg = N.getOperand(0); 492 unsigned ShImmVal = 0; 493 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) { 494 ShReg = CurDAG->getRegister(0, MVT::i32); 495 ShImmVal = RHS->getValue() & 31; 496 } else { 497 ShReg = N.getOperand(1); 498 } 499 Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal), 500 MVT::i32); 501 return true; 502} 503 504 505SDNode *ARMDAGToDAGISel::Select(SDOperand Op) { 506 SDNode *N = Op.Val; 507 unsigned Opcode = N->getOpcode(); 508 509 if (Opcode >= ISD::BUILTIN_OP_END && Opcode < ARMISD::FIRST_NUMBER) 510 return NULL; // Already selected. 511 512 switch (N->getOpcode()) { 513 default: break; 514 case ISD::Constant: { 515 unsigned Val = cast<ConstantSDNode>(N)->getValue(); 516 bool UseCP = true; 517 if (Subtarget->isThumb()) 518 UseCP = (Val > 255 && // MOV 519 ~Val > 255 && // MOV + MVN 520 !ARM_AM::isThumbImmShiftedVal(Val)); // MOV + LSL 521 else 522 UseCP = (ARM_AM::getSOImmVal(Val) == -1 && // MOV 523 ARM_AM::getSOImmVal(~Val) == -1 && // MVN 524 !ARM_AM::isSOImmTwoPartVal(Val)); // two instrs. 525 if (UseCP) { 526 SDOperand CPIdx = 527 CurDAG->getTargetConstantPool(ConstantInt::get(Type::Int32Ty, Val), 528 TLI.getPointerTy()); 529 530 SDNode *ResNode; 531 if (Subtarget->isThumb()) 532 ResNode = CurDAG->getTargetNode(ARM::tLDRpci, MVT::i32, MVT::Other, 533 CPIdx, CurDAG->getEntryNode()); 534 else { 535 SDOperand Ops[] = { 536 CPIdx, 537 CurDAG->getRegister(0, MVT::i32), 538 CurDAG->getTargetConstant(0, MVT::i32), 539 CurDAG->getEntryNode() 540 }; 541 ResNode = CurDAG->getTargetNode(ARM::LDR, MVT::i32, MVT::Other, Ops, 4); 542 } 543 ReplaceUses(Op, SDOperand(ResNode, 0)); 544 return NULL; 545 } 546 547 // Other cases are autogenerated. 548 break; 549 } 550 case ISD::FrameIndex: { 551 // Selects to ADDri FI, 0 which in turn will become ADDri SP, imm. 552 int FI = cast<FrameIndexSDNode>(N)->getIndex(); 553 unsigned Opc = Subtarget->isThumb() ? ARM::tADDrSPi : ARM::ADDri; 554 SDOperand TFI = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy()); 555 return CurDAG->SelectNodeTo(N, Opc, MVT::i32, TFI, 556 CurDAG->getTargetConstant(0, MVT::i32)); 557 } 558 case ISD::ADD: { 559 // Select add sp, c to tADDhirr. 560 SDOperand N0 = Op.getOperand(0); 561 SDOperand N1 = Op.getOperand(1); 562 RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(Op.getOperand(0)); 563 RegisterSDNode *RHSR = dyn_cast<RegisterSDNode>(Op.getOperand(1)); 564 if (LHSR && LHSR->getReg() == ARM::SP) { 565 std::swap(N0, N1); 566 std::swap(LHSR, RHSR); 567 } 568 if (RHSR && RHSR->getReg() == ARM::SP) { 569 AddToISelQueue(N0); 570 AddToISelQueue(N1); 571 return CurDAG->SelectNodeTo(N, ARM::tADDhirr, Op.getValueType(), N0, N1); 572 } 573 break; 574 } 575 case ISD::MUL: 576 if (Subtarget->isThumb()) 577 break; 578 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 579 unsigned RHSV = C->getValue(); 580 if (!RHSV) break; 581 if (isPowerOf2_32(RHSV-1)) { // 2^n+1? 582 SDOperand V = Op.getOperand(0); 583 AddToISelQueue(V); 584 unsigned ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, Log2_32(RHSV-1)); 585 SDOperand Ops[] = { V, V, CurDAG->getRegister(0, MVT::i32), 586 CurDAG->getTargetConstant(ShImm, MVT::i32) 587 }; 588 return CurDAG->SelectNodeTo(N, ARM::ADDrs, MVT::i32, Ops, 4); 589 } 590 if (isPowerOf2_32(RHSV+1)) { // 2^n-1? 591 SDOperand V = Op.getOperand(0); 592 AddToISelQueue(V); 593 unsigned ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, Log2_32(RHSV+1)); 594 SDOperand Ops[] = { V, V, CurDAG->getRegister(0, MVT::i32), 595 CurDAG->getTargetConstant(ShImm, MVT::i32) 596 }; 597 return CurDAG->SelectNodeTo(N, ARM::RSBrs, MVT::i32, Ops, 4); 598 } 599 } 600 break; 601 case ARMISD::FMRRD: 602 AddToISelQueue(Op.getOperand(0)); 603 return CurDAG->getTargetNode(ARM::FMRRD, MVT::i32, MVT::i32, 604 Op.getOperand(0)); 605 case ARMISD::MULHILOU: 606 AddToISelQueue(Op.getOperand(0)); 607 AddToISelQueue(Op.getOperand(1)); 608 return CurDAG->getTargetNode(ARM::UMULL, MVT::i32, MVT::i32, 609 Op.getOperand(0), Op.getOperand(1)); 610 case ARMISD::MULHILOS: 611 AddToISelQueue(Op.getOperand(0)); 612 AddToISelQueue(Op.getOperand(1)); 613 return CurDAG->getTargetNode(ARM::SMULL, MVT::i32, MVT::i32, 614 Op.getOperand(0), Op.getOperand(1)); 615 case ISD::LOAD: { 616 LoadSDNode *LD = cast<LoadSDNode>(Op); 617 ISD::MemIndexedMode AM = LD->getAddressingMode(); 618 MVT::ValueType LoadedVT = LD->getLoadedVT(); 619 if (AM != ISD::UNINDEXED) { 620 SDOperand Offset, AMOpc; 621 bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC); 622 unsigned Opcode = 0; 623 bool Match = false; 624 if (LoadedVT == MVT::i32 && 625 SelectAddrMode2Offset(Op, LD->getOffset(), Offset, AMOpc)) { 626 Opcode = isPre ? ARM::LDR_PRE : ARM::LDR_POST; 627 Match = true; 628 } else if (LoadedVT == MVT::i16 && 629 SelectAddrMode3Offset(Op, LD->getOffset(), Offset, AMOpc)) { 630 Match = true; 631 Opcode = (LD->getExtensionType() == ISD::SEXTLOAD) 632 ? (isPre ? ARM::LDRSH_PRE : ARM::LDRSH_POST) 633 : (isPre ? ARM::LDRH_PRE : ARM::LDRH_POST); 634 } else if (LoadedVT == MVT::i8 || LoadedVT == MVT::i1) { 635 if (LD->getExtensionType() == ISD::SEXTLOAD) { 636 if (SelectAddrMode3Offset(Op, LD->getOffset(), Offset, AMOpc)) { 637 Match = true; 638 Opcode = isPre ? ARM::LDRSB_PRE : ARM::LDRSB_POST; 639 } 640 } else { 641 if (SelectAddrMode2Offset(Op, LD->getOffset(), Offset, AMOpc)) { 642 Match = true; 643 Opcode = isPre ? ARM::LDRB_PRE : ARM::LDRB_POST; 644 } 645 } 646 } 647 648 if (Match) { 649 SDOperand Chain = LD->getChain(); 650 SDOperand Base = LD->getBasePtr(); 651 AddToISelQueue(Chain); 652 AddToISelQueue(Base); 653 AddToISelQueue(Offset); 654 SDOperand Ops[] = { Base, Offset, AMOpc, Chain }; 655 return CurDAG->getTargetNode(Opcode, MVT::i32, MVT::i32, 656 MVT::Other, Ops, 4); 657 } 658 } 659 // Other cases are autogenerated. 660 break; 661 } 662 } 663 664 return SelectCode(Op); 665} 666 667/// createARMISelDag - This pass converts a legalized DAG into a 668/// ARM-specific DAG, ready for instruction scheduling. 669/// 670FunctionPass *llvm::createARMISelDag(ARMTargetMachine &TM) { 671 return new ARMDAGToDAGISel(TM); 672} 673