1//===-- HexagonISelLowering.cpp - Hexagon DAG Lowering Implementation -----===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the interfaces that Hexagon uses to lower LLVM code 11// into a selection DAG. 12// 13//===----------------------------------------------------------------------===// 14 15#include "HexagonISelLowering.h" 16#include "HexagonTargetMachine.h" 17#include "HexagonMachineFunctionInfo.h" 18#include "HexagonTargetObjectFile.h" 19#include "HexagonSubtarget.h" 20#include "llvm/DerivedTypes.h" 21#include "llvm/Function.h" 22#include "llvm/InlineAsm.h" 23#include "llvm/GlobalVariable.h" 24#include "llvm/GlobalAlias.h" 25#include "llvm/Intrinsics.h" 26#include "llvm/CallingConv.h" 27#include "llvm/CodeGen/CallingConvLower.h" 28#include "llvm/CodeGen/MachineFrameInfo.h" 29#include "llvm/CodeGen/MachineFunction.h" 30#include "llvm/CodeGen/MachineInstrBuilder.h" 31#include "llvm/CodeGen/MachineJumpTableInfo.h" 32#include "llvm/CodeGen/MachineRegisterInfo.h" 33#include "llvm/CodeGen/SelectionDAGISel.h" 34#include "llvm/CodeGen/ValueTypes.h" 35#include "llvm/Support/CommandLine.h" 36#include "llvm/Support/Debug.h" 37#include "llvm/Support/ErrorHandling.h" 38#include "llvm/Support/raw_ostream.h" 39 40using namespace llvm; 41 42const unsigned Hexagon_MAX_RET_SIZE = 64; 43 44static cl::opt<bool> 45EmitJumpTables("hexagon-emit-jump-tables", cl::init(true), cl::Hidden, 46 cl::desc("Control jump table emission on Hexagon target")); 47 48int NumNamedVarArgParams = -1; 49 50// Implement calling convention for Hexagon. 51static bool 52CC_Hexagon(unsigned ValNo, MVT ValVT, 53 MVT LocVT, CCValAssign::LocInfo LocInfo, 54 ISD::ArgFlagsTy ArgFlags, CCState &State); 55 56static bool 57CC_Hexagon32(unsigned ValNo, MVT ValVT, 58 MVT LocVT, CCValAssign::LocInfo LocInfo, 59 ISD::ArgFlagsTy ArgFlags, CCState &State); 60 61static bool 62CC_Hexagon64(unsigned ValNo, MVT ValVT, 63 MVT LocVT, CCValAssign::LocInfo LocInfo, 64 ISD::ArgFlagsTy ArgFlags, CCState &State); 65 66static bool 67RetCC_Hexagon(unsigned ValNo, MVT ValVT, 68 MVT LocVT, CCValAssign::LocInfo LocInfo, 69 ISD::ArgFlagsTy ArgFlags, CCState &State); 70 71static bool 72RetCC_Hexagon32(unsigned ValNo, MVT ValVT, 73 MVT LocVT, CCValAssign::LocInfo LocInfo, 74 ISD::ArgFlagsTy ArgFlags, CCState &State); 75 76static bool 77RetCC_Hexagon64(unsigned ValNo, MVT ValVT, 78 MVT LocVT, CCValAssign::LocInfo LocInfo, 79 ISD::ArgFlagsTy ArgFlags, CCState &State); 80 81static bool 82CC_Hexagon_VarArg (unsigned ValNo, MVT ValVT, 83 MVT LocVT, CCValAssign::LocInfo LocInfo, 84 ISD::ArgFlagsTy ArgFlags, CCState &State) { 85 86 // NumNamedVarArgParams can not be zero for a VarArg function. 87 assert ( (NumNamedVarArgParams > 0) && 88 "NumNamedVarArgParams is not bigger than zero."); 89 90 if ( (int)ValNo < NumNamedVarArgParams ) { 91 // Deal with named arguments. 92 return CC_Hexagon(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State); 93 } 94 95 // Deal with un-named arguments. 96 unsigned ofst; 97 if (ArgFlags.isByVal()) { 98 // If pass-by-value, the size allocated on stack is decided 99 // by ArgFlags.getByValSize(), not by the size of LocVT. 100 assert ((ArgFlags.getByValSize() > 8) && 101 "ByValSize must be bigger than 8 bytes"); 102 ofst = State.AllocateStack(ArgFlags.getByValSize(), 4); 103 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo)); 104 return false; 105 } 106 if (LocVT == MVT::i32 || LocVT == MVT::f32) { 107 ofst = State.AllocateStack(4, 4); 108 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo)); 109 return false; 110 } 111 if (LocVT == MVT::i64 || LocVT == MVT::f64) { 112 ofst = State.AllocateStack(8, 8); 113 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo)); 114 return false; 115 } 116 llvm_unreachable(0); 117} 118 119 120static bool 121CC_Hexagon (unsigned ValNo, MVT ValVT, 122 MVT LocVT, CCValAssign::LocInfo LocInfo, 123 ISD::ArgFlagsTy ArgFlags, CCState &State) { 124 125 if (ArgFlags.isByVal()) { 126 // Passed on stack. 127 assert ((ArgFlags.getByValSize() > 8) && 128 "ByValSize must be bigger than 8 bytes"); 129 unsigned Offset = State.AllocateStack(ArgFlags.getByValSize(), 4); 130 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); 131 return false; 132 } 133 134 if (LocVT == MVT::i1 || LocVT == MVT::i8 || LocVT == MVT::i16) { 135 LocVT = MVT::i32; 136 ValVT = MVT::i32; 137 if (ArgFlags.isSExt()) 138 LocInfo = CCValAssign::SExt; 139 else if (ArgFlags.isZExt()) 140 LocInfo = CCValAssign::ZExt; 141 else 142 LocInfo = CCValAssign::AExt; 143 } 144 145 if (LocVT == MVT::i32 || LocVT == MVT::f32) { 146 if (!CC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State)) 147 return false; 148 } 149 150 if (LocVT == MVT::i64 || LocVT == MVT::f64) { 151 if (!CC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State)) 152 return false; 153 } 154 155 return true; // CC didn't match. 156} 157 158 159static bool CC_Hexagon32(unsigned ValNo, MVT ValVT, 160 MVT LocVT, CCValAssign::LocInfo LocInfo, 161 ISD::ArgFlagsTy ArgFlags, CCState &State) { 162 163 static const uint16_t RegList[] = { 164 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4, 165 Hexagon::R5 166 }; 167 if (unsigned Reg = State.AllocateReg(RegList, 6)) { 168 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 169 return false; 170 } 171 172 unsigned Offset = State.AllocateStack(4, 4); 173 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); 174 return false; 175} 176 177static bool CC_Hexagon64(unsigned ValNo, MVT ValVT, 178 MVT LocVT, CCValAssign::LocInfo LocInfo, 179 ISD::ArgFlagsTy ArgFlags, CCState &State) { 180 181 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) { 182 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 183 return false; 184 } 185 186 static const uint16_t RegList1[] = { 187 Hexagon::D1, Hexagon::D2 188 }; 189 static const uint16_t RegList2[] = { 190 Hexagon::R1, Hexagon::R3 191 }; 192 if (unsigned Reg = State.AllocateReg(RegList1, RegList2, 2)) { 193 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 194 return false; 195 } 196 197 unsigned Offset = State.AllocateStack(8, 8, Hexagon::D2); 198 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); 199 return false; 200} 201 202static bool RetCC_Hexagon(unsigned ValNo, MVT ValVT, 203 MVT LocVT, CCValAssign::LocInfo LocInfo, 204 ISD::ArgFlagsTy ArgFlags, CCState &State) { 205 206 207 if (LocVT == MVT::i1 || 208 LocVT == MVT::i8 || 209 LocVT == MVT::i16) { 210 LocVT = MVT::i32; 211 ValVT = MVT::i32; 212 if (ArgFlags.isSExt()) 213 LocInfo = CCValAssign::SExt; 214 else if (ArgFlags.isZExt()) 215 LocInfo = CCValAssign::ZExt; 216 else 217 LocInfo = CCValAssign::AExt; 218 } 219 220 if (LocVT == MVT::i32 || LocVT == MVT::f32) { 221 if (!RetCC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State)) 222 return false; 223 } 224 225 if (LocVT == MVT::i64 || LocVT == MVT::f64) { 226 if (!RetCC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State)) 227 return false; 228 } 229 230 return true; // CC didn't match. 231} 232 233static bool RetCC_Hexagon32(unsigned ValNo, MVT ValVT, 234 MVT LocVT, CCValAssign::LocInfo LocInfo, 235 ISD::ArgFlagsTy ArgFlags, CCState &State) { 236 237 if (LocVT == MVT::i32 || LocVT == MVT::f32) { 238 if (unsigned Reg = State.AllocateReg(Hexagon::R0)) { 239 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 240 return false; 241 } 242 } 243 244 unsigned Offset = State.AllocateStack(4, 4); 245 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); 246 return false; 247} 248 249static bool RetCC_Hexagon64(unsigned ValNo, MVT ValVT, 250 MVT LocVT, CCValAssign::LocInfo LocInfo, 251 ISD::ArgFlagsTy ArgFlags, CCState &State) { 252 if (LocVT == MVT::i64 || LocVT == MVT::f64) { 253 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) { 254 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 255 return false; 256 } 257 } 258 259 unsigned Offset = State.AllocateStack(8, 8); 260 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo)); 261 return false; 262} 263 264SDValue 265HexagonTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) 266const { 267 return SDValue(); 268} 269 270/// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified 271/// by "Src" to address "Dst" of size "Size". Alignment information is 272/// specified by the specific parameter attribute. The copy will be passed as 273/// a byval function parameter. Sometimes what we are copying is the end of a 274/// larger object, the part that does not fit in registers. 275static SDValue 276CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain, 277 ISD::ArgFlagsTy Flags, SelectionDAG &DAG, 278 DebugLoc dl) { 279 280 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32); 281 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(), 282 /*isVolatile=*/false, /*AlwaysInline=*/false, 283 MachinePointerInfo(), MachinePointerInfo()); 284} 285 286 287// LowerReturn - Lower ISD::RET. If a struct is larger than 8 bytes and is 288// passed by value, the function prototype is modified to return void and 289// the value is stored in memory pointed by a pointer passed by caller. 290SDValue 291HexagonTargetLowering::LowerReturn(SDValue Chain, 292 CallingConv::ID CallConv, bool isVarArg, 293 const SmallVectorImpl<ISD::OutputArg> &Outs, 294 const SmallVectorImpl<SDValue> &OutVals, 295 DebugLoc dl, SelectionDAG &DAG) const { 296 297 // CCValAssign - represent the assignment of the return value to locations. 298 SmallVector<CCValAssign, 16> RVLocs; 299 300 // CCState - Info about the registers and stack slot. 301 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 302 getTargetMachine(), RVLocs, *DAG.getContext()); 303 304 // Analyze return values of ISD::RET 305 CCInfo.AnalyzeReturn(Outs, RetCC_Hexagon); 306 307 // If this is the first return lowered for this function, add the regs to the 308 // liveout set for the function. 309 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) { 310 for (unsigned i = 0; i != RVLocs.size(); ++i) 311 if (RVLocs[i].isRegLoc()) 312 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg()); 313 } 314 315 SDValue Flag; 316 // Copy the result values into the output registers. 317 for (unsigned i = 0; i != RVLocs.size(); ++i) { 318 CCValAssign &VA = RVLocs[i]; 319 320 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), OutVals[i], Flag); 321 322 // Guarantee that all emitted copies are stuck together with flags. 323 Flag = Chain.getValue(1); 324 } 325 326 if (Flag.getNode()) 327 return DAG.getNode(HexagonISD::RET_FLAG, dl, MVT::Other, Chain, Flag); 328 329 return DAG.getNode(HexagonISD::RET_FLAG, dl, MVT::Other, Chain); 330} 331 332 333 334 335/// LowerCallResult - Lower the result values of an ISD::CALL into the 336/// appropriate copies out of appropriate physical registers. This assumes that 337/// Chain/InFlag are the input chain/flag to use, and that TheCall is the call 338/// being lowered. Returns a SDNode with the same number of values as the 339/// ISD::CALL. 340SDValue 341HexagonTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag, 342 CallingConv::ID CallConv, bool isVarArg, 343 const 344 SmallVectorImpl<ISD::InputArg> &Ins, 345 DebugLoc dl, SelectionDAG &DAG, 346 SmallVectorImpl<SDValue> &InVals, 347 const SmallVectorImpl<SDValue> &OutVals, 348 SDValue Callee) const { 349 350 // Assign locations to each value returned by this call. 351 SmallVector<CCValAssign, 16> RVLocs; 352 353 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 354 getTargetMachine(), RVLocs, *DAG.getContext()); 355 356 CCInfo.AnalyzeCallResult(Ins, RetCC_Hexagon); 357 358 // Copy all of the result registers out of their specified physreg. 359 for (unsigned i = 0; i != RVLocs.size(); ++i) { 360 Chain = DAG.getCopyFromReg(Chain, dl, 361 RVLocs[i].getLocReg(), 362 RVLocs[i].getValVT(), InFlag).getValue(1); 363 InFlag = Chain.getValue(2); 364 InVals.push_back(Chain.getValue(0)); 365 } 366 367 return Chain; 368} 369 370/// LowerCall - Functions arguments are copied from virtual regs to 371/// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted. 372SDValue 373HexagonTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, 374 SmallVectorImpl<SDValue> &InVals) const { 375 SelectionDAG &DAG = CLI.DAG; 376 DebugLoc &dl = CLI.DL; 377 SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs; 378 SmallVector<SDValue, 32> &OutVals = CLI.OutVals; 379 SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins; 380 SDValue Chain = CLI.Chain; 381 SDValue Callee = CLI.Callee; 382 bool &isTailCall = CLI.IsTailCall; 383 CallingConv::ID CallConv = CLI.CallConv; 384 bool isVarArg = CLI.IsVarArg; 385 386 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet(); 387 388 // Analyze operands of the call, assigning locations to each operand. 389 SmallVector<CCValAssign, 16> ArgLocs; 390 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 391 getTargetMachine(), ArgLocs, *DAG.getContext()); 392 393 // Check for varargs. 394 NumNamedVarArgParams = -1; 395 if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Callee)) 396 { 397 const Function* CalleeFn = NULL; 398 Callee = DAG.getTargetGlobalAddress(GA->getGlobal(), dl, MVT::i32); 399 if ((CalleeFn = dyn_cast<Function>(GA->getGlobal()))) 400 { 401 // If a function has zero args and is a vararg function, that's 402 // disallowed so it must be an undeclared function. Do not assume 403 // varargs if the callee is undefined. 404 if (CalleeFn->isVarArg() && 405 CalleeFn->getFunctionType()->getNumParams() != 0) { 406 NumNamedVarArgParams = CalleeFn->getFunctionType()->getNumParams(); 407 } 408 } 409 } 410 411 if (NumNamedVarArgParams > 0) 412 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon_VarArg); 413 else 414 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon); 415 416 417 if(isTailCall) { 418 bool StructAttrFlag = 419 DAG.getMachineFunction().getFunction()->hasStructRetAttr(); 420 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv, 421 isVarArg, IsStructRet, 422 StructAttrFlag, 423 Outs, OutVals, Ins, DAG); 424 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i){ 425 CCValAssign &VA = ArgLocs[i]; 426 if (VA.isMemLoc()) { 427 isTailCall = false; 428 break; 429 } 430 } 431 if (isTailCall) { 432 DEBUG(dbgs () << "Eligible for Tail Call\n"); 433 } else { 434 DEBUG(dbgs () << 435 "Argument must be passed on stack. Not eligible for Tail Call\n"); 436 } 437 } 438 // Get a count of how many bytes are to be pushed on the stack. 439 unsigned NumBytes = CCInfo.getNextStackOffset(); 440 SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass; 441 SmallVector<SDValue, 8> MemOpChains; 442 443 SDValue StackPtr = 444 DAG.getCopyFromReg(Chain, dl, TM.getRegisterInfo()->getStackRegister(), 445 getPointerTy()); 446 447 // Walk the register/memloc assignments, inserting copies/loads. 448 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { 449 CCValAssign &VA = ArgLocs[i]; 450 SDValue Arg = OutVals[i]; 451 ISD::ArgFlagsTy Flags = Outs[i].Flags; 452 453 // Promote the value if needed. 454 switch (VA.getLocInfo()) { 455 default: 456 // Loc info must be one of Full, SExt, ZExt, or AExt. 457 llvm_unreachable("Unknown loc info!"); 458 case CCValAssign::Full: 459 break; 460 case CCValAssign::SExt: 461 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); 462 break; 463 case CCValAssign::ZExt: 464 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); 465 break; 466 case CCValAssign::AExt: 467 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); 468 break; 469 } 470 471 if (VA.isMemLoc()) { 472 unsigned LocMemOffset = VA.getLocMemOffset(); 473 SDValue PtrOff = DAG.getConstant(LocMemOffset, StackPtr.getValueType()); 474 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 475 476 if (Flags.isByVal()) { 477 // The argument is a struct passed by value. According to LLVM, "Arg" 478 // is is pointer. 479 MemOpChains.push_back(CreateCopyOfByValArgument(Arg, PtrOff, Chain, 480 Flags, DAG, dl)); 481 } else { 482 // The argument is not passed by value. "Arg" is a buildin type. It is 483 // not a pointer. 484 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, 485 MachinePointerInfo(),false, false, 486 0)); 487 } 488 continue; 489 } 490 491 // Arguments that can be passed on register must be kept at RegsToPass 492 // vector. 493 if (VA.isRegLoc()) { 494 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); 495 } 496 } 497 498 // Transform all store nodes into one single node because all store 499 // nodes are independent of each other. 500 if (!MemOpChains.empty()) { 501 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOpChains[0], 502 MemOpChains.size()); 503 } 504 505 if (!isTailCall) 506 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes, 507 getPointerTy(), true)); 508 509 // Build a sequence of copy-to-reg nodes chained together with token 510 // chain and flag operands which copy the outgoing args into registers. 511 // The InFlag in necessary since all emitted instructions must be 512 // stuck together. 513 SDValue InFlag; 514 if (!isTailCall) { 515 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { 516 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, 517 RegsToPass[i].second, InFlag); 518 InFlag = Chain.getValue(1); 519 } 520 } 521 522 // For tail calls lower the arguments to the 'real' stack slot. 523 if (isTailCall) { 524 // Force all the incoming stack arguments to be loaded from the stack 525 // before any new outgoing arguments are stored to the stack, because the 526 // outgoing stack slots may alias the incoming argument stack slots, and 527 // the alias isn't otherwise explicit. This is slightly more conservative 528 // than necessary, because it means that each store effectively depends 529 // on every argument instead of just those arguments it would clobber. 530 // 531 // Do not flag preceding copytoreg stuff together with the following stuff. 532 InFlag = SDValue(); 533 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { 534 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, 535 RegsToPass[i].second, InFlag); 536 InFlag = Chain.getValue(1); 537 } 538 InFlag =SDValue(); 539 } 540 541 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every 542 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol 543 // node so that legalize doesn't hack it. 544 if (flag_aligned_memcpy) { 545 const char *MemcpyName = 546 "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes"; 547 Callee = 548 DAG.getTargetExternalSymbol(MemcpyName, getPointerTy()); 549 flag_aligned_memcpy = false; 550 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) { 551 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy()); 552 } else if (ExternalSymbolSDNode *S = 553 dyn_cast<ExternalSymbolSDNode>(Callee)) { 554 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy()); 555 } 556 557 // Returns a chain & a flag for retval copy to use. 558 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); 559 SmallVector<SDValue, 8> Ops; 560 Ops.push_back(Chain); 561 Ops.push_back(Callee); 562 563 // Add argument registers to the end of the list so that they are 564 // known live into the call. 565 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { 566 Ops.push_back(DAG.getRegister(RegsToPass[i].first, 567 RegsToPass[i].second.getValueType())); 568 } 569 570 if (InFlag.getNode()) { 571 Ops.push_back(InFlag); 572 } 573 574 if (isTailCall) 575 return DAG.getNode(HexagonISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size()); 576 577 Chain = DAG.getNode(HexagonISD::CALL, dl, NodeTys, &Ops[0], Ops.size()); 578 InFlag = Chain.getValue(1); 579 580 // Create the CALLSEQ_END node. 581 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true), 582 DAG.getIntPtrConstant(0, true), InFlag); 583 InFlag = Chain.getValue(1); 584 585 // Handle result values, copying them out of physregs into vregs that we 586 // return. 587 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, DAG, 588 InVals, OutVals, Callee); 589} 590 591static bool getIndexedAddressParts(SDNode *Ptr, EVT VT, 592 bool isSEXTLoad, SDValue &Base, 593 SDValue &Offset, bool &isInc, 594 SelectionDAG &DAG) { 595 if (Ptr->getOpcode() != ISD::ADD) 596 return false; 597 598 if (VT == MVT::i64 || VT == MVT::i32 || VT == MVT::i16 || VT == MVT::i8) { 599 isInc = (Ptr->getOpcode() == ISD::ADD); 600 Base = Ptr->getOperand(0); 601 Offset = Ptr->getOperand(1); 602 // Ensure that Offset is a constant. 603 return (isa<ConstantSDNode>(Offset)); 604 } 605 606 return false; 607} 608 609// TODO: Put this function along with the other isS* functions in 610// HexagonISelDAGToDAG.cpp into a common file. Or better still, use the 611// functions defined in HexagonImmediates.td. 612static bool Is_PostInc_S4_Offset(SDNode * S, int ShiftAmount) { 613 ConstantSDNode *N = cast<ConstantSDNode>(S); 614 615 // immS4 predicate - True if the immediate fits in a 4-bit sign extended. 616 // field. 617 int64_t v = (int64_t)N->getSExtValue(); 618 int64_t m = 0; 619 if (ShiftAmount > 0) { 620 m = v % ShiftAmount; 621 v = v >> ShiftAmount; 622 } 623 return (v <= 7) && (v >= -8) && (m == 0); 624} 625 626/// getPostIndexedAddressParts - returns true by value, base pointer and 627/// offset pointer and addressing mode by reference if this node can be 628/// combined with a load / store to form a post-indexed load / store. 629bool HexagonTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op, 630 SDValue &Base, 631 SDValue &Offset, 632 ISD::MemIndexedMode &AM, 633 SelectionDAG &DAG) const 634{ 635 EVT VT; 636 SDValue Ptr; 637 bool isSEXTLoad = false; 638 639 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) { 640 VT = LD->getMemoryVT(); 641 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD; 642 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) { 643 VT = ST->getMemoryVT(); 644 if (ST->getValue().getValueType() == MVT::i64 && ST->isTruncatingStore()) { 645 return false; 646 } 647 } else { 648 return false; 649 } 650 651 bool isInc = false; 652 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset, 653 isInc, DAG); 654 // ShiftAmount = number of left-shifted bits in the Hexagon instruction. 655 int ShiftAmount = VT.getSizeInBits() / 16; 656 if (isLegal && Is_PostInc_S4_Offset(Offset.getNode(), ShiftAmount)) { 657 AM = isInc ? ISD::POST_INC : ISD::POST_DEC; 658 return true; 659 } 660 661 return false; 662} 663 664SDValue HexagonTargetLowering::LowerINLINEASM(SDValue Op, 665 SelectionDAG &DAG) const { 666 SDNode *Node = Op.getNode(); 667 MachineFunction &MF = DAG.getMachineFunction(); 668 HexagonMachineFunctionInfo *FuncInfo = 669 MF.getInfo<HexagonMachineFunctionInfo>(); 670 switch (Node->getOpcode()) { 671 case ISD::INLINEASM: { 672 unsigned NumOps = Node->getNumOperands(); 673 if (Node->getOperand(NumOps-1).getValueType() == MVT::Glue) 674 --NumOps; // Ignore the flag operand. 675 676 for (unsigned i = InlineAsm::Op_FirstOperand; i != NumOps;) { 677 if (FuncInfo->hasClobberLR()) 678 break; 679 unsigned Flags = 680 cast<ConstantSDNode>(Node->getOperand(i))->getZExtValue(); 681 unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags); 682 ++i; // Skip the ID value. 683 684 switch (InlineAsm::getKind(Flags)) { 685 default: llvm_unreachable("Bad flags!"); 686 case InlineAsm::Kind_RegDef: 687 case InlineAsm::Kind_RegUse: 688 case InlineAsm::Kind_Imm: 689 case InlineAsm::Kind_Clobber: 690 case InlineAsm::Kind_Mem: { 691 for (; NumVals; --NumVals, ++i) {} 692 break; 693 } 694 case InlineAsm::Kind_RegDefEarlyClobber: { 695 for (; NumVals; --NumVals, ++i) { 696 unsigned Reg = 697 cast<RegisterSDNode>(Node->getOperand(i))->getReg(); 698 699 // Check it to be lr 700 if (Reg == TM.getRegisterInfo()->getRARegister()) { 701 FuncInfo->setHasClobberLR(true); 702 break; 703 } 704 } 705 break; 706 } 707 } 708 } 709 } 710 } // Node->getOpcode 711 return Op; 712} 713 714 715// 716// Taken from the XCore backend. 717// 718SDValue HexagonTargetLowering:: 719LowerBR_JT(SDValue Op, SelectionDAG &DAG) const 720{ 721 SDValue Chain = Op.getOperand(0); 722 SDValue Table = Op.getOperand(1); 723 SDValue Index = Op.getOperand(2); 724 DebugLoc dl = Op.getDebugLoc(); 725 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table); 726 unsigned JTI = JT->getIndex(); 727 MachineFunction &MF = DAG.getMachineFunction(); 728 const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); 729 SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32); 730 731 // Mark all jump table targets as address taken. 732 const std::vector<MachineJumpTableEntry> &JTE = MJTI->getJumpTables(); 733 const std::vector<MachineBasicBlock*> &JTBBs = JTE[JTI].MBBs; 734 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) { 735 MachineBasicBlock *MBB = JTBBs[i]; 736 MBB->setHasAddressTaken(); 737 // This line is needed to set the hasAddressTaken flag on the BasicBlock 738 // object. 739 BlockAddress::get(const_cast<BasicBlock *>(MBB->getBasicBlock())); 740 } 741 742 SDValue JumpTableBase = DAG.getNode(HexagonISD::WrapperJT, dl, 743 getPointerTy(), TargetJT); 744 SDValue ShiftIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index, 745 DAG.getConstant(2, MVT::i32)); 746 SDValue JTAddress = DAG.getNode(ISD::ADD, dl, MVT::i32, JumpTableBase, 747 ShiftIndex); 748 SDValue LoadTarget = DAG.getLoad(MVT::i32, dl, Chain, JTAddress, 749 MachinePointerInfo(), false, false, false, 750 0); 751 return DAG.getNode(HexagonISD::BR_JT, dl, MVT::Other, Chain, LoadTarget); 752} 753 754 755SDValue 756HexagonTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op, 757 SelectionDAG &DAG) const { 758 SDValue Chain = Op.getOperand(0); 759 SDValue Size = Op.getOperand(1); 760 DebugLoc dl = Op.getDebugLoc(); 761 762 unsigned SPReg = getStackPointerRegisterToSaveRestore(); 763 764 // Get a reference to the stack pointer. 765 SDValue StackPointer = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32); 766 767 // Subtract the dynamic size from the actual stack size to 768 // obtain the new stack size. 769 SDValue Sub = DAG.getNode(ISD::SUB, dl, MVT::i32, StackPointer, Size); 770 771 // 772 // For Hexagon, the outgoing memory arguments area should be on top of the 773 // alloca area on the stack i.e., the outgoing memory arguments should be 774 // at a lower address than the alloca area. Move the alloca area down the 775 // stack by adding back the space reserved for outgoing arguments to SP 776 // here. 777 // 778 // We do not know what the size of the outgoing args is at this point. 779 // So, we add a pseudo instruction ADJDYNALLOC that will adjust the 780 // stack pointer. We patch this instruction with the correct, known 781 // offset in emitPrologue(). 782 // 783 // Use a placeholder immediate (zero) for now. This will be patched up 784 // by emitPrologue(). 785 SDValue ArgAdjust = DAG.getNode(HexagonISD::ADJDYNALLOC, dl, 786 MVT::i32, 787 Sub, 788 DAG.getConstant(0, MVT::i32)); 789 790 // The Sub result contains the new stack start address, so it 791 // must be placed in the stack pointer register. 792 SDValue CopyChain = DAG.getCopyToReg(Chain, dl, 793 TM.getRegisterInfo()->getStackRegister(), 794 Sub); 795 796 SDValue Ops[2] = { ArgAdjust, CopyChain }; 797 return DAG.getMergeValues(Ops, 2, dl); 798} 799 800SDValue 801HexagonTargetLowering::LowerFormalArguments(SDValue Chain, 802 CallingConv::ID CallConv, 803 bool isVarArg, 804 const 805 SmallVectorImpl<ISD::InputArg> &Ins, 806 DebugLoc dl, SelectionDAG &DAG, 807 SmallVectorImpl<SDValue> &InVals) 808const { 809 810 MachineFunction &MF = DAG.getMachineFunction(); 811 MachineFrameInfo *MFI = MF.getFrameInfo(); 812 MachineRegisterInfo &RegInfo = MF.getRegInfo(); 813 HexagonMachineFunctionInfo *FuncInfo = 814 MF.getInfo<HexagonMachineFunctionInfo>(); 815 816 817 // Assign locations to all of the incoming arguments. 818 SmallVector<CCValAssign, 16> ArgLocs; 819 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 820 getTargetMachine(), ArgLocs, *DAG.getContext()); 821 822 CCInfo.AnalyzeFormalArguments(Ins, CC_Hexagon); 823 824 // For LLVM, in the case when returning a struct by value (>8byte), 825 // the first argument is a pointer that points to the location on caller's 826 // stack where the return value will be stored. For Hexagon, the location on 827 // caller's stack is passed only when the struct size is smaller than (and 828 // equal to) 8 bytes. If not, no address will be passed into callee and 829 // callee return the result direclty through R0/R1. 830 831 SmallVector<SDValue, 4> MemOps; 832 833 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { 834 CCValAssign &VA = ArgLocs[i]; 835 ISD::ArgFlagsTy Flags = Ins[i].Flags; 836 unsigned ObjSize; 837 unsigned StackLocation; 838 int FI; 839 840 if ( (VA.isRegLoc() && !Flags.isByVal()) 841 || (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() > 8)) { 842 // Arguments passed in registers 843 // 1. int, long long, ptr args that get allocated in register. 844 // 2. Large struct that gets an register to put its address in. 845 EVT RegVT = VA.getLocVT(); 846 if (RegVT == MVT::i8 || RegVT == MVT::i16 || 847 RegVT == MVT::i32 || RegVT == MVT::f32) { 848 unsigned VReg = 849 RegInfo.createVirtualRegister(&Hexagon::IntRegsRegClass); 850 RegInfo.addLiveIn(VA.getLocReg(), VReg); 851 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT)); 852 } else if (RegVT == MVT::i64) { 853 unsigned VReg = 854 RegInfo.createVirtualRegister(&Hexagon::DoubleRegsRegClass); 855 RegInfo.addLiveIn(VA.getLocReg(), VReg); 856 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT)); 857 } else { 858 assert (0); 859 } 860 } else if (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() <= 8) { 861 assert (0 && "ByValSize must be bigger than 8 bytes"); 862 } else { 863 // Sanity check. 864 assert(VA.isMemLoc()); 865 866 if (Flags.isByVal()) { 867 // If it's a byval parameter, then we need to compute the 868 // "real" size, not the size of the pointer. 869 ObjSize = Flags.getByValSize(); 870 } else { 871 ObjSize = VA.getLocVT().getStoreSizeInBits() >> 3; 872 } 873 874 StackLocation = HEXAGON_LRFP_SIZE + VA.getLocMemOffset(); 875 // Create the frame index object for this incoming parameter... 876 FI = MFI->CreateFixedObject(ObjSize, StackLocation, true); 877 878 // Create the SelectionDAG nodes cordl, responding to a load 879 // from this parameter. 880 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32); 881 882 if (Flags.isByVal()) { 883 // If it's a pass-by-value aggregate, then do not dereference the stack 884 // location. Instead, we should generate a reference to the stack 885 // location. 886 InVals.push_back(FIN); 887 } else { 888 InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN, 889 MachinePointerInfo(), false, false, 890 false, 0)); 891 } 892 } 893 } 894 895 if (!MemOps.empty()) 896 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOps[0], 897 MemOps.size()); 898 899 if (isVarArg) { 900 // This will point to the next argument passed via stack. 901 int FrameIndex = MFI->CreateFixedObject(Hexagon_PointerSize, 902 HEXAGON_LRFP_SIZE + 903 CCInfo.getNextStackOffset(), 904 true); 905 FuncInfo->setVarArgsFrameIndex(FrameIndex); 906 } 907 908 return Chain; 909} 910 911SDValue 912HexagonTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const { 913 // VASTART stores the address of the VarArgsFrameIndex slot into the 914 // memory location argument. 915 MachineFunction &MF = DAG.getMachineFunction(); 916 HexagonMachineFunctionInfo *QFI = MF.getInfo<HexagonMachineFunctionInfo>(); 917 SDValue Addr = DAG.getFrameIndex(QFI->getVarArgsFrameIndex(), MVT::i32); 918 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue(); 919 return DAG.getStore(Op.getOperand(0), Op.getDebugLoc(), Addr, 920 Op.getOperand(1), MachinePointerInfo(SV), false, 921 false, 0); 922} 923 924SDValue 925HexagonTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const { 926 SDValue LHS = Op.getOperand(0); 927 SDValue RHS = Op.getOperand(1); 928 SDValue CC = Op.getOperand(4); 929 SDValue TrueVal = Op.getOperand(2); 930 SDValue FalseVal = Op.getOperand(3); 931 DebugLoc dl = Op.getDebugLoc(); 932 SDNode* OpNode = Op.getNode(); 933 EVT SVT = OpNode->getValueType(0); 934 935 SDValue Cond = DAG.getNode(ISD::SETCC, dl, MVT::i1, LHS, RHS, CC); 936 return DAG.getNode(ISD::SELECT, dl, SVT, Cond, TrueVal, FalseVal); 937} 938 939SDValue 940HexagonTargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const { 941 EVT ValTy = Op.getValueType(); 942 943 DebugLoc dl = Op.getDebugLoc(); 944 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op); 945 SDValue Res; 946 if (CP->isMachineConstantPoolEntry()) 947 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), ValTy, 948 CP->getAlignment()); 949 else 950 Res = DAG.getTargetConstantPool(CP->getConstVal(), ValTy, 951 CP->getAlignment()); 952 return DAG.getNode(HexagonISD::CONST32, dl, ValTy, Res); 953} 954 955SDValue 956HexagonTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const { 957 const TargetRegisterInfo *TRI = TM.getRegisterInfo(); 958 MachineFunction &MF = DAG.getMachineFunction(); 959 MachineFrameInfo *MFI = MF.getFrameInfo(); 960 MFI->setReturnAddressIsTaken(true); 961 962 EVT VT = Op.getValueType(); 963 DebugLoc dl = Op.getDebugLoc(); 964 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); 965 if (Depth) { 966 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG); 967 SDValue Offset = DAG.getConstant(4, MVT::i32); 968 return DAG.getLoad(VT, dl, DAG.getEntryNode(), 969 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset), 970 MachinePointerInfo(), false, false, false, 0); 971 } 972 973 // Return LR, which contains the return address. Mark it an implicit live-in. 974 unsigned Reg = MF.addLiveIn(TRI->getRARegister(), getRegClassFor(MVT::i32)); 975 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT); 976} 977 978SDValue 979HexagonTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const { 980 const HexagonRegisterInfo *TRI = TM.getRegisterInfo(); 981 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 982 MFI->setFrameAddressIsTaken(true); 983 984 EVT VT = Op.getValueType(); 985 DebugLoc dl = Op.getDebugLoc(); 986 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); 987 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, 988 TRI->getFrameRegister(), VT); 989 while (Depth--) 990 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, 991 MachinePointerInfo(), 992 false, false, false, 0); 993 return FrameAddr; 994} 995 996 997SDValue HexagonTargetLowering::LowerMEMBARRIER(SDValue Op, 998 SelectionDAG& DAG) const { 999 DebugLoc dl = Op.getDebugLoc(); 1000 return DAG.getNode(HexagonISD::BARRIER, dl, MVT::Other, Op.getOperand(0)); 1001} 1002 1003 1004SDValue HexagonTargetLowering::LowerATOMIC_FENCE(SDValue Op, 1005 SelectionDAG& DAG) const { 1006 DebugLoc dl = Op.getDebugLoc(); 1007 return DAG.getNode(HexagonISD::BARRIER, dl, MVT::Other, Op.getOperand(0)); 1008} 1009 1010 1011SDValue HexagonTargetLowering::LowerGLOBALADDRESS(SDValue Op, 1012 SelectionDAG &DAG) const { 1013 SDValue Result; 1014 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); 1015 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset(); 1016 DebugLoc dl = Op.getDebugLoc(); 1017 Result = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), Offset); 1018 1019 HexagonTargetObjectFile &TLOF = 1020 (HexagonTargetObjectFile&)getObjFileLowering(); 1021 if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) { 1022 return DAG.getNode(HexagonISD::CONST32_GP, dl, getPointerTy(), Result); 1023 } 1024 1025 return DAG.getNode(HexagonISD::CONST32, dl, getPointerTy(), Result); 1026} 1027 1028//===----------------------------------------------------------------------===// 1029// TargetLowering Implementation 1030//===----------------------------------------------------------------------===// 1031 1032HexagonTargetLowering::HexagonTargetLowering(HexagonTargetMachine 1033 &targetmachine) 1034 : TargetLowering(targetmachine, new HexagonTargetObjectFile()), 1035 TM(targetmachine) { 1036 1037 const HexagonRegisterInfo* QRI = TM.getRegisterInfo(); 1038 1039 // Set up the register classes. 1040 addRegisterClass(MVT::i32, &Hexagon::IntRegsRegClass); 1041 addRegisterClass(MVT::i64, &Hexagon::DoubleRegsRegClass); 1042 1043 if (QRI->Subtarget.hasV5TOps()) { 1044 addRegisterClass(MVT::f32, &Hexagon::IntRegsRegClass); 1045 addRegisterClass(MVT::f64, &Hexagon::DoubleRegsRegClass); 1046 } 1047 1048 addRegisterClass(MVT::i1, &Hexagon::PredRegsRegClass); 1049 1050 computeRegisterProperties(); 1051 1052 // Align loop entry 1053 setPrefLoopAlignment(4); 1054 1055 // Limits for inline expansion of memcpy/memmove 1056 maxStoresPerMemcpy = 6; 1057 maxStoresPerMemmove = 6; 1058 1059 // 1060 // Library calls for unsupported operations 1061 // 1062 1063 setLibcallName(RTLIB::SINTTOFP_I128_F64, "__hexagon_floattidf"); 1064 setLibcallName(RTLIB::SINTTOFP_I128_F32, "__hexagon_floattisf"); 1065 1066 setLibcallName(RTLIB::FPTOUINT_F32_I128, "__hexagon_fixunssfti"); 1067 setLibcallName(RTLIB::FPTOUINT_F64_I128, "__hexagon_fixunsdfti"); 1068 1069 setLibcallName(RTLIB::FPTOSINT_F32_I128, "__hexagon_fixsfti"); 1070 setLibcallName(RTLIB::FPTOSINT_F64_I128, "__hexagon_fixdfti"); 1071 1072 setLibcallName(RTLIB::SDIV_I32, "__hexagon_divsi3"); 1073 setOperationAction(ISD::SDIV, MVT::i32, Expand); 1074 setLibcallName(RTLIB::SREM_I32, "__hexagon_umodsi3"); 1075 setOperationAction(ISD::SREM, MVT::i32, Expand); 1076 1077 setLibcallName(RTLIB::SDIV_I64, "__hexagon_divdi3"); 1078 setOperationAction(ISD::SDIV, MVT::i64, Expand); 1079 setLibcallName(RTLIB::SREM_I64, "__hexagon_moddi3"); 1080 setOperationAction(ISD::SREM, MVT::i64, Expand); 1081 1082 setLibcallName(RTLIB::UDIV_I32, "__hexagon_udivsi3"); 1083 setOperationAction(ISD::UDIV, MVT::i32, Expand); 1084 1085 setLibcallName(RTLIB::UDIV_I64, "__hexagon_udivdi3"); 1086 setOperationAction(ISD::UDIV, MVT::i64, Expand); 1087 1088 setLibcallName(RTLIB::UREM_I32, "__hexagon_umodsi3"); 1089 setOperationAction(ISD::UREM, MVT::i32, Expand); 1090 1091 setLibcallName(RTLIB::UREM_I64, "__hexagon_umoddi3"); 1092 setOperationAction(ISD::UREM, MVT::i64, Expand); 1093 1094 setLibcallName(RTLIB::DIV_F32, "__hexagon_divsf3"); 1095 setOperationAction(ISD::FDIV, MVT::f32, Expand); 1096 1097 setLibcallName(RTLIB::DIV_F64, "__hexagon_divdf3"); 1098 setOperationAction(ISD::FDIV, MVT::f64, Expand); 1099 1100 setOperationAction(ISD::FSQRT, MVT::f32, Expand); 1101 setOperationAction(ISD::FSQRT, MVT::f64, Expand); 1102 setOperationAction(ISD::FSIN, MVT::f32, Expand); 1103 setOperationAction(ISD::FSIN, MVT::f64, Expand); 1104 1105 if (QRI->Subtarget.hasV5TOps()) { 1106 // Hexagon V5 Support. 1107 setOperationAction(ISD::FADD, MVT::f32, Legal); 1108 setOperationAction(ISD::FADD, MVT::f64, Legal); 1109 setOperationAction(ISD::FP_EXTEND, MVT::f32, Legal); 1110 setCondCodeAction(ISD::SETOEQ, MVT::f32, Legal); 1111 setCondCodeAction(ISD::SETOEQ, MVT::f64, Legal); 1112 setCondCodeAction(ISD::SETUEQ, MVT::f32, Legal); 1113 setCondCodeAction(ISD::SETUEQ, MVT::f64, Legal); 1114 1115 setCondCodeAction(ISD::SETOGE, MVT::f32, Legal); 1116 setCondCodeAction(ISD::SETOGE, MVT::f64, Legal); 1117 setCondCodeAction(ISD::SETUGE, MVT::f32, Legal); 1118 setCondCodeAction(ISD::SETUGE, MVT::f64, Legal); 1119 1120 setCondCodeAction(ISD::SETOGT, MVT::f32, Legal); 1121 setCondCodeAction(ISD::SETOGT, MVT::f64, Legal); 1122 setCondCodeAction(ISD::SETUGT, MVT::f32, Legal); 1123 setCondCodeAction(ISD::SETUGT, MVT::f64, Legal); 1124 1125 setCondCodeAction(ISD::SETOLE, MVT::f32, Legal); 1126 setCondCodeAction(ISD::SETOLE, MVT::f64, Legal); 1127 setCondCodeAction(ISD::SETOLT, MVT::f32, Legal); 1128 setCondCodeAction(ISD::SETOLT, MVT::f64, Legal); 1129 1130 setOperationAction(ISD::ConstantFP, MVT::f32, Legal); 1131 setOperationAction(ISD::ConstantFP, MVT::f64, Legal); 1132 1133 setOperationAction(ISD::FP_TO_UINT, MVT::i1, Promote); 1134 setOperationAction(ISD::FP_TO_SINT, MVT::i1, Promote); 1135 setOperationAction(ISD::UINT_TO_FP, MVT::i1, Promote); 1136 setOperationAction(ISD::SINT_TO_FP, MVT::i1, Promote); 1137 1138 setOperationAction(ISD::FP_TO_UINT, MVT::i8, Promote); 1139 setOperationAction(ISD::FP_TO_SINT, MVT::i8, Promote); 1140 setOperationAction(ISD::UINT_TO_FP, MVT::i8, Promote); 1141 setOperationAction(ISD::SINT_TO_FP, MVT::i8, Promote); 1142 1143 setOperationAction(ISD::FP_TO_UINT, MVT::i16, Promote); 1144 setOperationAction(ISD::FP_TO_SINT, MVT::i16, Promote); 1145 setOperationAction(ISD::UINT_TO_FP, MVT::i16, Promote); 1146 setOperationAction(ISD::SINT_TO_FP, MVT::i16, Promote); 1147 1148 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Legal); 1149 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Legal); 1150 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Legal); 1151 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Legal); 1152 1153 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Legal); 1154 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Legal); 1155 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Legal); 1156 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Legal); 1157 1158 setOperationAction(ISD::FABS, MVT::f32, Legal); 1159 setOperationAction(ISD::FABS, MVT::f64, Expand); 1160 1161 setOperationAction(ISD::FNEG, MVT::f32, Legal); 1162 setOperationAction(ISD::FNEG, MVT::f64, Expand); 1163 } else { 1164 1165 // Expand fp<->uint. 1166 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Expand); 1167 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); 1168 1169 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand); 1170 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); 1171 1172 setLibcallName(RTLIB::SINTTOFP_I64_F32, "__hexagon_floatdisf"); 1173 setLibcallName(RTLIB::UINTTOFP_I64_F32, "__hexagon_floatundisf"); 1174 1175 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__hexagon_floatunsisf"); 1176 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__hexagon_floatsisf"); 1177 1178 setLibcallName(RTLIB::SINTTOFP_I64_F64, "__hexagon_floatdidf"); 1179 setLibcallName(RTLIB::UINTTOFP_I64_F64, "__hexagon_floatundidf"); 1180 1181 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__hexagon_floatunsidf"); 1182 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__hexagon_floatsidf"); 1183 1184 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__hexagon_fixunssfsi"); 1185 setLibcallName(RTLIB::FPTOUINT_F32_I64, "__hexagon_fixunssfdi"); 1186 1187 setLibcallName(RTLIB::FPTOSINT_F64_I64, "__hexagon_fixdfdi"); 1188 setLibcallName(RTLIB::FPTOSINT_F32_I64, "__hexagon_fixsfdi"); 1189 1190 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__hexagon_fixunsdfsi"); 1191 setLibcallName(RTLIB::FPTOUINT_F64_I64, "__hexagon_fixunsdfdi"); 1192 1193 setLibcallName(RTLIB::ADD_F64, "__hexagon_adddf3"); 1194 setOperationAction(ISD::FADD, MVT::f64, Expand); 1195 1196 setLibcallName(RTLIB::ADD_F32, "__hexagon_addsf3"); 1197 setOperationAction(ISD::FADD, MVT::f32, Expand); 1198 1199 setLibcallName(RTLIB::FPEXT_F32_F64, "__hexagon_extendsfdf2"); 1200 setOperationAction(ISD::FP_EXTEND, MVT::f32, Expand); 1201 1202 setLibcallName(RTLIB::OEQ_F32, "__hexagon_eqsf2"); 1203 setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand); 1204 1205 setLibcallName(RTLIB::OEQ_F64, "__hexagon_eqdf2"); 1206 setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand); 1207 1208 setLibcallName(RTLIB::OGE_F32, "__hexagon_gesf2"); 1209 setCondCodeAction(ISD::SETOGE, MVT::f32, Expand); 1210 1211 setLibcallName(RTLIB::OGE_F64, "__hexagon_gedf2"); 1212 setCondCodeAction(ISD::SETOGE, MVT::f64, Expand); 1213 1214 setLibcallName(RTLIB::OGT_F32, "__hexagon_gtsf2"); 1215 setCondCodeAction(ISD::SETOGT, MVT::f32, Expand); 1216 1217 setLibcallName(RTLIB::OGT_F64, "__hexagon_gtdf2"); 1218 setCondCodeAction(ISD::SETOGT, MVT::f64, Expand); 1219 1220 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__hexagon_fixdfsi"); 1221 setOperationAction(ISD::FP_TO_SINT, MVT::f64, Expand); 1222 1223 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__hexagon_fixsfsi"); 1224 setOperationAction(ISD::FP_TO_SINT, MVT::f32, Expand); 1225 1226 setLibcallName(RTLIB::OLE_F64, "__hexagon_ledf2"); 1227 setCondCodeAction(ISD::SETOLE, MVT::f64, Expand); 1228 1229 setLibcallName(RTLIB::OLE_F32, "__hexagon_lesf2"); 1230 setCondCodeAction(ISD::SETOLE, MVT::f32, Expand); 1231 1232 setLibcallName(RTLIB::OLT_F64, "__hexagon_ltdf2"); 1233 setCondCodeAction(ISD::SETOLT, MVT::f64, Expand); 1234 1235 setLibcallName(RTLIB::OLT_F32, "__hexagon_ltsf2"); 1236 setCondCodeAction(ISD::SETOLT, MVT::f32, Expand); 1237 1238 setLibcallName(RTLIB::MUL_F64, "__hexagon_muldf3"); 1239 setOperationAction(ISD::FMUL, MVT::f64, Expand); 1240 1241 setLibcallName(RTLIB::MUL_F32, "__hexagon_mulsf3"); 1242 setOperationAction(ISD::MUL, MVT::f32, Expand); 1243 1244 setLibcallName(RTLIB::UNE_F64, "__hexagon_nedf2"); 1245 setCondCodeAction(ISD::SETUNE, MVT::f64, Expand); 1246 1247 setLibcallName(RTLIB::UNE_F32, "__hexagon_nesf2"); 1248 1249 setLibcallName(RTLIB::SUB_F64, "__hexagon_subdf3"); 1250 setOperationAction(ISD::SUB, MVT::f64, Expand); 1251 1252 setLibcallName(RTLIB::SUB_F32, "__hexagon_subsf3"); 1253 setOperationAction(ISD::SUB, MVT::f32, Expand); 1254 1255 setLibcallName(RTLIB::FPROUND_F64_F32, "__hexagon_truncdfsf2"); 1256 setOperationAction(ISD::FP_ROUND, MVT::f64, Expand); 1257 1258 setLibcallName(RTLIB::UO_F64, "__hexagon_unorddf2"); 1259 setCondCodeAction(ISD::SETUO, MVT::f64, Expand); 1260 1261 setLibcallName(RTLIB::O_F64, "__hexagon_unorddf2"); 1262 setCondCodeAction(ISD::SETO, MVT::f64, Expand); 1263 1264 setLibcallName(RTLIB::O_F32, "__hexagon_unordsf2"); 1265 setCondCodeAction(ISD::SETO, MVT::f32, Expand); 1266 1267 setLibcallName(RTLIB::UO_F32, "__hexagon_unordsf2"); 1268 setCondCodeAction(ISD::SETUO, MVT::f32, Expand); 1269 1270 setOperationAction(ISD::FABS, MVT::f32, Expand); 1271 setOperationAction(ISD::FABS, MVT::f64, Expand); 1272 setOperationAction(ISD::FNEG, MVT::f32, Expand); 1273 setOperationAction(ISD::FNEG, MVT::f64, Expand); 1274 } 1275 1276 setLibcallName(RTLIB::SREM_I32, "__hexagon_modsi3"); 1277 setOperationAction(ISD::SREM, MVT::i32, Expand); 1278 1279 setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal); 1280 setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal); 1281 setIndexedLoadAction(ISD::POST_INC, MVT::i32, Legal); 1282 setIndexedLoadAction(ISD::POST_INC, MVT::i64, Legal); 1283 1284 setIndexedStoreAction(ISD::POST_INC, MVT::i8, Legal); 1285 setIndexedStoreAction(ISD::POST_INC, MVT::i16, Legal); 1286 setIndexedStoreAction(ISD::POST_INC, MVT::i32, Legal); 1287 setIndexedStoreAction(ISD::POST_INC, MVT::i64, Legal); 1288 1289 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand); 1290 1291 // Turn FP extload into load/fextend. 1292 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand); 1293 // Hexagon has a i1 sign extending load. 1294 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Expand); 1295 // Turn FP truncstore into trunc + store. 1296 setTruncStoreAction(MVT::f64, MVT::f32, Expand); 1297 1298 // Custom legalize GlobalAddress nodes into CONST32. 1299 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); 1300 setOperationAction(ISD::GlobalAddress, MVT::i8, Custom); 1301 // Truncate action? 1302 setOperationAction(ISD::TRUNCATE, MVT::i64, Expand); 1303 1304 // Hexagon doesn't have sext_inreg, replace them with shl/sra. 1305 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand); 1306 1307 // Hexagon has no REM or DIVREM operations. 1308 setOperationAction(ISD::UREM, MVT::i32, Expand); 1309 setOperationAction(ISD::SREM, MVT::i32, Expand); 1310 setOperationAction(ISD::SDIVREM, MVT::i32, Expand); 1311 setOperationAction(ISD::UDIVREM, MVT::i32, Expand); 1312 setOperationAction(ISD::SREM, MVT::i64, Expand); 1313 setOperationAction(ISD::SDIVREM, MVT::i64, Expand); 1314 setOperationAction(ISD::UDIVREM, MVT::i64, Expand); 1315 1316 setOperationAction(ISD::BSWAP, MVT::i64, Expand); 1317 1318 // Lower SELECT_CC to SETCC and SELECT. 1319 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); 1320 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom); 1321 1322 if (QRI->Subtarget.hasV5TOps()) { 1323 1324 // We need to make the operation type of SELECT node to be Custom, 1325 // such that we don't go into the infinite loop of 1326 // select -> setcc -> select_cc -> select loop. 1327 setOperationAction(ISD::SELECT, MVT::f32, Custom); 1328 setOperationAction(ISD::SELECT, MVT::f64, Custom); 1329 1330 setOperationAction(ISD::SELECT_CC, MVT::f32, Expand); 1331 setOperationAction(ISD::SELECT_CC, MVT::f64, Expand); 1332 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand); 1333 1334 } else { 1335 1336 // Hexagon has no select or setcc: expand to SELECT_CC. 1337 setOperationAction(ISD::SELECT, MVT::f32, Expand); 1338 setOperationAction(ISD::SELECT, MVT::f64, Expand); 1339 1340 // This is a workaround documented in DAGCombiner.cpp:2892 We don't 1341 // support SELECT_CC on every type. 1342 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand); 1343 1344 } 1345 1346 setOperationAction(ISD::BR_CC, MVT::Other, Expand); 1347 setOperationAction(ISD::BRIND, MVT::Other, Expand); 1348 if (EmitJumpTables) { 1349 setOperationAction(ISD::BR_JT, MVT::Other, Custom); 1350 } else { 1351 setOperationAction(ISD::BR_JT, MVT::Other, Expand); 1352 } 1353 1354 setOperationAction(ISD::BR_CC, MVT::i32, Expand); 1355 1356 setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom); 1357 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Custom); 1358 1359 setOperationAction(ISD::FSIN , MVT::f64, Expand); 1360 setOperationAction(ISD::FCOS , MVT::f64, Expand); 1361 setOperationAction(ISD::FREM , MVT::f64, Expand); 1362 setOperationAction(ISD::FSIN , MVT::f32, Expand); 1363 setOperationAction(ISD::FCOS , MVT::f32, Expand); 1364 setOperationAction(ISD::FREM , MVT::f32, Expand); 1365 setOperationAction(ISD::CTPOP, MVT::i32, Expand); 1366 setOperationAction(ISD::CTTZ , MVT::i32, Expand); 1367 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand); 1368 setOperationAction(ISD::CTLZ , MVT::i32, Expand); 1369 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand); 1370 setOperationAction(ISD::ROTL , MVT::i32, Expand); 1371 setOperationAction(ISD::ROTR , MVT::i32, Expand); 1372 setOperationAction(ISD::BSWAP, MVT::i32, Expand); 1373 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand); 1374 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand); 1375 setOperationAction(ISD::FPOW , MVT::f64, Expand); 1376 setOperationAction(ISD::FPOW , MVT::f32, Expand); 1377 1378 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); 1379 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); 1380 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); 1381 1382 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand); 1383 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand); 1384 1385 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand); 1386 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand); 1387 1388 setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand); 1389 setOperationAction(ISD::EHSELECTION, MVT::i64, Expand); 1390 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand); 1391 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand); 1392 1393 setOperationAction(ISD::EH_RETURN, MVT::Other, Expand); 1394 1395 if (TM.getSubtargetImpl()->isSubtargetV2()) { 1396 setExceptionPointerRegister(Hexagon::R20); 1397 setExceptionSelectorRegister(Hexagon::R21); 1398 } else { 1399 setExceptionPointerRegister(Hexagon::R0); 1400 setExceptionSelectorRegister(Hexagon::R1); 1401 } 1402 1403 // VASTART needs to be custom lowered to use the VarArgsFrameIndex. 1404 setOperationAction(ISD::VASTART , MVT::Other, Custom); 1405 1406 // Use the default implementation. 1407 setOperationAction(ISD::VAARG , MVT::Other, Expand); 1408 setOperationAction(ISD::VACOPY , MVT::Other, Expand); 1409 setOperationAction(ISD::VAEND , MVT::Other, Expand); 1410 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); 1411 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); 1412 1413 1414 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom); 1415 setOperationAction(ISD::INLINEASM , MVT::Other, Custom); 1416 1417 setMinFunctionAlignment(2); 1418 1419 // Needed for DYNAMIC_STACKALLOC expansion. 1420 unsigned StackRegister = TM.getRegisterInfo()->getStackRegister(); 1421 setStackPointerRegisterToSaveRestore(StackRegister); 1422 setSchedulingPreference(Sched::VLIW); 1423} 1424 1425 1426const char* 1427HexagonTargetLowering::getTargetNodeName(unsigned Opcode) const { 1428 switch (Opcode) { 1429 default: return 0; 1430 case HexagonISD::CONST32: return "HexagonISD::CONST32"; 1431 case HexagonISD::ADJDYNALLOC: return "HexagonISD::ADJDYNALLOC"; 1432 case HexagonISD::CMPICC: return "HexagonISD::CMPICC"; 1433 case HexagonISD::CMPFCC: return "HexagonISD::CMPFCC"; 1434 case HexagonISD::BRICC: return "HexagonISD::BRICC"; 1435 case HexagonISD::BRFCC: return "HexagonISD::BRFCC"; 1436 case HexagonISD::SELECT_ICC: return "HexagonISD::SELECT_ICC"; 1437 case HexagonISD::SELECT_FCC: return "HexagonISD::SELECT_FCC"; 1438 case HexagonISD::Hi: return "HexagonISD::Hi"; 1439 case HexagonISD::Lo: return "HexagonISD::Lo"; 1440 case HexagonISD::FTOI: return "HexagonISD::FTOI"; 1441 case HexagonISD::ITOF: return "HexagonISD::ITOF"; 1442 case HexagonISD::CALL: return "HexagonISD::CALL"; 1443 case HexagonISD::RET_FLAG: return "HexagonISD::RET_FLAG"; 1444 case HexagonISD::BR_JT: return "HexagonISD::BR_JT"; 1445 case HexagonISD::TC_RETURN: return "HexagonISD::TC_RETURN"; 1446 } 1447} 1448 1449bool 1450HexagonTargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const { 1451 EVT MTy1 = EVT::getEVT(Ty1); 1452 EVT MTy2 = EVT::getEVT(Ty2); 1453 if (!MTy1.isSimple() || !MTy2.isSimple()) { 1454 return false; 1455 } 1456 return ((MTy1.getSimpleVT() == MVT::i64) && (MTy2.getSimpleVT() == MVT::i32)); 1457} 1458 1459bool HexagonTargetLowering::isTruncateFree(EVT VT1, EVT VT2) const { 1460 if (!VT1.isSimple() || !VT2.isSimple()) { 1461 return false; 1462 } 1463 return ((VT1.getSimpleVT() == MVT::i64) && (VT2.getSimpleVT() == MVT::i32)); 1464} 1465 1466SDValue 1467HexagonTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const { 1468 switch (Op.getOpcode()) { 1469 default: llvm_unreachable("Should not custom lower this!"); 1470 case ISD::ConstantPool: return LowerConstantPool(Op, DAG); 1471 // Frame & Return address. Currently unimplemented. 1472 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG); 1473 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); 1474 case ISD::GlobalTLSAddress: 1475 llvm_unreachable("TLS not implemented for Hexagon."); 1476 case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG); 1477 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, DAG); 1478 case ISD::GlobalAddress: return LowerGLOBALADDRESS(Op, DAG); 1479 case ISD::VASTART: return LowerVASTART(Op, DAG); 1480 case ISD::BR_JT: return LowerBR_JT(Op, DAG); 1481 1482 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG); 1483 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); 1484 case ISD::SELECT: return Op; 1485 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG); 1486 case ISD::INLINEASM: return LowerINLINEASM(Op, DAG); 1487 1488 } 1489} 1490 1491 1492 1493//===----------------------------------------------------------------------===// 1494// Hexagon Scheduler Hooks 1495//===----------------------------------------------------------------------===// 1496MachineBasicBlock * 1497HexagonTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, 1498 MachineBasicBlock *BB) 1499const { 1500 switch (MI->getOpcode()) { 1501 case Hexagon::ADJDYNALLOC: { 1502 MachineFunction *MF = BB->getParent(); 1503 HexagonMachineFunctionInfo *FuncInfo = 1504 MF->getInfo<HexagonMachineFunctionInfo>(); 1505 FuncInfo->addAllocaAdjustInst(MI); 1506 return BB; 1507 } 1508 default: llvm_unreachable("Unexpected instr type to insert"); 1509 } // switch 1510} 1511 1512//===----------------------------------------------------------------------===// 1513// Inline Assembly Support 1514//===----------------------------------------------------------------------===// 1515 1516std::pair<unsigned, const TargetRegisterClass*> 1517HexagonTargetLowering::getRegForInlineAsmConstraint(const 1518 std::string &Constraint, 1519 EVT VT) const { 1520 if (Constraint.size() == 1) { 1521 switch (Constraint[0]) { 1522 case 'r': // R0-R31 1523 switch (VT.getSimpleVT().SimpleTy) { 1524 default: 1525 llvm_unreachable("getRegForInlineAsmConstraint Unhandled data type"); 1526 case MVT::i32: 1527 case MVT::i16: 1528 case MVT::i8: 1529 case MVT::f32: 1530 return std::make_pair(0U, &Hexagon::IntRegsRegClass); 1531 case MVT::i64: 1532 case MVT::f64: 1533 return std::make_pair(0U, &Hexagon::DoubleRegsRegClass); 1534 } 1535 default: 1536 llvm_unreachable("Unknown asm register class"); 1537 } 1538 } 1539 1540 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); 1541} 1542 1543/// isFPImmLegal - Returns true if the target can instruction select the 1544/// specified FP immediate natively. If false, the legalizer will 1545/// materialize the FP immediate as a load from a constant pool. 1546bool HexagonTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const { 1547 const HexagonRegisterInfo* QRI = TM.getRegisterInfo(); 1548 return QRI->Subtarget.hasV5TOps(); 1549} 1550 1551/// isLegalAddressingMode - Return true if the addressing mode represented by 1552/// AM is legal for this target, for a load/store of the specified type. 1553bool HexagonTargetLowering::isLegalAddressingMode(const AddrMode &AM, 1554 Type *Ty) const { 1555 // Allows a signed-extended 11-bit immediate field. 1556 if (AM.BaseOffs <= -(1LL << 13) || AM.BaseOffs >= (1LL << 13)-1) { 1557 return false; 1558 } 1559 1560 // No global is ever allowed as a base. 1561 if (AM.BaseGV) { 1562 return false; 1563 } 1564 1565 int Scale = AM.Scale; 1566 if (Scale < 0) Scale = -Scale; 1567 switch (Scale) { 1568 case 0: // No scale reg, "r+i", "r", or just "i". 1569 break; 1570 default: // No scaled addressing mode. 1571 return false; 1572 } 1573 return true; 1574} 1575 1576/// isLegalICmpImmediate - Return true if the specified immediate is legal 1577/// icmp immediate, that is the target has icmp instructions which can compare 1578/// a register against the immediate without having to materialize the 1579/// immediate into a register. 1580bool HexagonTargetLowering::isLegalICmpImmediate(int64_t Imm) const { 1581 return Imm >= -512 && Imm <= 511; 1582} 1583 1584/// IsEligibleForTailCallOptimization - Check whether the call is eligible 1585/// for tail call optimization. Targets which want to do tail call 1586/// optimization should implement this function. 1587bool HexagonTargetLowering::IsEligibleForTailCallOptimization( 1588 SDValue Callee, 1589 CallingConv::ID CalleeCC, 1590 bool isVarArg, 1591 bool isCalleeStructRet, 1592 bool isCallerStructRet, 1593 const SmallVectorImpl<ISD::OutputArg> &Outs, 1594 const SmallVectorImpl<SDValue> &OutVals, 1595 const SmallVectorImpl<ISD::InputArg> &Ins, 1596 SelectionDAG& DAG) const { 1597 const Function *CallerF = DAG.getMachineFunction().getFunction(); 1598 CallingConv::ID CallerCC = CallerF->getCallingConv(); 1599 bool CCMatch = CallerCC == CalleeCC; 1600 1601 // *************************************************************************** 1602 // Look for obvious safe cases to perform tail call optimization that do not 1603 // require ABI changes. 1604 // *************************************************************************** 1605 1606 // If this is a tail call via a function pointer, then don't do it! 1607 if (!(dyn_cast<GlobalAddressSDNode>(Callee)) 1608 && !(dyn_cast<ExternalSymbolSDNode>(Callee))) { 1609 return false; 1610 } 1611 1612 // Do not optimize if the calling conventions do not match. 1613 if (!CCMatch) 1614 return false; 1615 1616 // Do not tail call optimize vararg calls. 1617 if (isVarArg) 1618 return false; 1619 1620 // Also avoid tail call optimization if either caller or callee uses struct 1621 // return semantics. 1622 if (isCalleeStructRet || isCallerStructRet) 1623 return false; 1624 1625 // In addition to the cases above, we also disable Tail Call Optimization if 1626 // the calling convention code that at least one outgoing argument needs to 1627 // go on the stack. We cannot check that here because at this point that 1628 // information is not available. 1629 return true; 1630} 1631