1 //===-- Mips16ISelLowering.h - Mips16 DAG Lowering Interface ----*- C++ -*-===// 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 // Subclass of MipsTargetLowering specialized for mips16. 11 // 12 //===----------------------------------------------------------------------===// 13 #include "Mips16ISelLowering.h" 14 #include "MCTargetDesc/MipsBaseInfo.h" 15 #include "Mips16HardFloatInfo.h" 16 #include "MipsMachineFunction.h" 17 #include "MipsRegisterInfo.h" 18 #include "MipsTargetMachine.h" 19 #include "llvm/CodeGen/MachineInstrBuilder.h" 20 #include "llvm/Support/CommandLine.h" 21 #include "llvm/Target/TargetInstrInfo.h" 22 23 using namespace llvm; 24 25 #define DEBUG_TYPE "mips-lower" 26 27 static cl::opt<bool> DontExpandCondPseudos16( 28 "mips16-dont-expand-cond-pseudo", 29 cl::init(false), 30 cl::desc("Don't expand conditional move related " 31 "pseudos for Mips 16"), 32 cl::Hidden); 33 34 namespace { 35 struct Mips16Libcall { 36 RTLIB::Libcall Libcall; 37 const char *Name; 38 39 bool operator<(const Mips16Libcall &RHS) const { 40 return std::strcmp(Name, RHS.Name) < 0; 41 } 42 }; 43 44 struct Mips16IntrinsicHelperType{ 45 const char* Name; 46 const char* Helper; 47 48 bool operator<(const Mips16IntrinsicHelperType &RHS) const { 49 return std::strcmp(Name, RHS.Name) < 0; 50 } 51 bool operator==(const Mips16IntrinsicHelperType &RHS) const { 52 return std::strcmp(Name, RHS.Name) == 0; 53 } 54 }; 55 } 56 57 // Libcalls for which no helper is generated. Sorted by name for binary search. 58 static const Mips16Libcall HardFloatLibCalls[] = { 59 { RTLIB::ADD_F64, "__mips16_adddf3" }, 60 { RTLIB::ADD_F32, "__mips16_addsf3" }, 61 { RTLIB::DIV_F64, "__mips16_divdf3" }, 62 { RTLIB::DIV_F32, "__mips16_divsf3" }, 63 { RTLIB::OEQ_F64, "__mips16_eqdf2" }, 64 { RTLIB::OEQ_F32, "__mips16_eqsf2" }, 65 { RTLIB::FPEXT_F32_F64, "__mips16_extendsfdf2" }, 66 { RTLIB::FPTOSINT_F64_I32, "__mips16_fix_truncdfsi" }, 67 { RTLIB::FPTOSINT_F32_I32, "__mips16_fix_truncsfsi" }, 68 { RTLIB::SINTTOFP_I32_F64, "__mips16_floatsidf" }, 69 { RTLIB::SINTTOFP_I32_F32, "__mips16_floatsisf" }, 70 { RTLIB::UINTTOFP_I32_F64, "__mips16_floatunsidf" }, 71 { RTLIB::UINTTOFP_I32_F32, "__mips16_floatunsisf" }, 72 { RTLIB::OGE_F64, "__mips16_gedf2" }, 73 { RTLIB::OGE_F32, "__mips16_gesf2" }, 74 { RTLIB::OGT_F64, "__mips16_gtdf2" }, 75 { RTLIB::OGT_F32, "__mips16_gtsf2" }, 76 { RTLIB::OLE_F64, "__mips16_ledf2" }, 77 { RTLIB::OLE_F32, "__mips16_lesf2" }, 78 { RTLIB::OLT_F64, "__mips16_ltdf2" }, 79 { RTLIB::OLT_F32, "__mips16_ltsf2" }, 80 { RTLIB::MUL_F64, "__mips16_muldf3" }, 81 { RTLIB::MUL_F32, "__mips16_mulsf3" }, 82 { RTLIB::UNE_F64, "__mips16_nedf2" }, 83 { RTLIB::UNE_F32, "__mips16_nesf2" }, 84 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_dc" }, // No associated libcall. 85 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_df" }, // No associated libcall. 86 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_sc" }, // No associated libcall. 87 { RTLIB::UNKNOWN_LIBCALL, "__mips16_ret_sf" }, // No associated libcall. 88 { RTLIB::SUB_F64, "__mips16_subdf3" }, 89 { RTLIB::SUB_F32, "__mips16_subsf3" }, 90 { RTLIB::FPROUND_F64_F32, "__mips16_truncdfsf2" }, 91 { RTLIB::UO_F64, "__mips16_unorddf2" }, 92 { RTLIB::UO_F32, "__mips16_unordsf2" } 93 }; 94 95 static const Mips16IntrinsicHelperType Mips16IntrinsicHelper[] = { 96 {"__fixunsdfsi", "__mips16_call_stub_2" }, 97 {"ceil", "__mips16_call_stub_df_2"}, 98 {"ceilf", "__mips16_call_stub_sf_1"}, 99 {"copysign", "__mips16_call_stub_df_10"}, 100 {"copysignf", "__mips16_call_stub_sf_5"}, 101 {"cos", "__mips16_call_stub_df_2"}, 102 {"cosf", "__mips16_call_stub_sf_1"}, 103 {"exp2", "__mips16_call_stub_df_2"}, 104 {"exp2f", "__mips16_call_stub_sf_1"}, 105 {"floor", "__mips16_call_stub_df_2"}, 106 {"floorf", "__mips16_call_stub_sf_1"}, 107 {"log2", "__mips16_call_stub_df_2"}, 108 {"log2f", "__mips16_call_stub_sf_1"}, 109 {"nearbyint", "__mips16_call_stub_df_2"}, 110 {"nearbyintf", "__mips16_call_stub_sf_1"}, 111 {"rint", "__mips16_call_stub_df_2"}, 112 {"rintf", "__mips16_call_stub_sf_1"}, 113 {"sin", "__mips16_call_stub_df_2"}, 114 {"sinf", "__mips16_call_stub_sf_1"}, 115 {"sqrt", "__mips16_call_stub_df_2"}, 116 {"sqrtf", "__mips16_call_stub_sf_1"}, 117 {"trunc", "__mips16_call_stub_df_2"}, 118 {"truncf", "__mips16_call_stub_sf_1"}, 119 }; 120 121 Mips16TargetLowering::Mips16TargetLowering(const MipsTargetMachine &TM, 122 const MipsSubtarget &STI) 123 : MipsTargetLowering(TM, STI) { 124 125 // Set up the register classes 126 addRegisterClass(MVT::i32, &Mips::CPU16RegsRegClass); 127 128 if (!Subtarget.useSoftFloat()) 129 setMips16HardFloatLibCalls(); 130 131 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand); 132 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Expand); 133 setOperationAction(ISD::ATOMIC_SWAP, MVT::i32, Expand); 134 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i32, Expand); 135 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i32, Expand); 136 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i32, Expand); 137 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i32, Expand); 138 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i32, Expand); 139 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand); 140 setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i32, Expand); 141 setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i32, Expand); 142 setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i32, Expand); 143 setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i32, Expand); 144 145 setOperationAction(ISD::ROTR, MVT::i32, Expand); 146 setOperationAction(ISD::ROTR, MVT::i64, Expand); 147 setOperationAction(ISD::BSWAP, MVT::i32, Expand); 148 setOperationAction(ISD::BSWAP, MVT::i64, Expand); 149 150 computeRegisterProperties(STI.getRegisterInfo()); 151 } 152 153 const MipsTargetLowering * 154 llvm::createMips16TargetLowering(const MipsTargetMachine &TM, 155 const MipsSubtarget &STI) { 156 return new Mips16TargetLowering(TM, STI); 157 } 158 159 bool 160 Mips16TargetLowering::allowsMisalignedMemoryAccesses(EVT VT, 161 unsigned, 162 unsigned, 163 bool *Fast) const { 164 return false; 165 } 166 167 MachineBasicBlock * 168 Mips16TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI, 169 MachineBasicBlock *BB) const { 170 switch (MI.getOpcode()) { 171 default: 172 return MipsTargetLowering::EmitInstrWithCustomInserter(MI, BB); 173 case Mips::SelBeqZ: 174 return emitSel16(Mips::BeqzRxImm16, MI, BB); 175 case Mips::SelBneZ: 176 return emitSel16(Mips::BnezRxImm16, MI, BB); 177 case Mips::SelTBteqZCmpi: 178 return emitSeliT16(Mips::Bteqz16, Mips::CmpiRxImmX16, MI, BB); 179 case Mips::SelTBteqZSlti: 180 return emitSeliT16(Mips::Bteqz16, Mips::SltiRxImmX16, MI, BB); 181 case Mips::SelTBteqZSltiu: 182 return emitSeliT16(Mips::Bteqz16, Mips::SltiuRxImmX16, MI, BB); 183 case Mips::SelTBtneZCmpi: 184 return emitSeliT16(Mips::Btnez16, Mips::CmpiRxImmX16, MI, BB); 185 case Mips::SelTBtneZSlti: 186 return emitSeliT16(Mips::Btnez16, Mips::SltiRxImmX16, MI, BB); 187 case Mips::SelTBtneZSltiu: 188 return emitSeliT16(Mips::Btnez16, Mips::SltiuRxImmX16, MI, BB); 189 case Mips::SelTBteqZCmp: 190 return emitSelT16(Mips::Bteqz16, Mips::CmpRxRy16, MI, BB); 191 case Mips::SelTBteqZSlt: 192 return emitSelT16(Mips::Bteqz16, Mips::SltRxRy16, MI, BB); 193 case Mips::SelTBteqZSltu: 194 return emitSelT16(Mips::Bteqz16, Mips::SltuRxRy16, MI, BB); 195 case Mips::SelTBtneZCmp: 196 return emitSelT16(Mips::Btnez16, Mips::CmpRxRy16, MI, BB); 197 case Mips::SelTBtneZSlt: 198 return emitSelT16(Mips::Btnez16, Mips::SltRxRy16, MI, BB); 199 case Mips::SelTBtneZSltu: 200 return emitSelT16(Mips::Btnez16, Mips::SltuRxRy16, MI, BB); 201 case Mips::BteqzT8CmpX16: 202 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::CmpRxRy16, MI, BB); 203 case Mips::BteqzT8SltX16: 204 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::SltRxRy16, MI, BB); 205 case Mips::BteqzT8SltuX16: 206 // TBD: figure out a way to get this or remove the instruction 207 // altogether. 208 return emitFEXT_T8I816_ins(Mips::Bteqz16, Mips::SltuRxRy16, MI, BB); 209 case Mips::BtnezT8CmpX16: 210 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::CmpRxRy16, MI, BB); 211 case Mips::BtnezT8SltX16: 212 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::SltRxRy16, MI, BB); 213 case Mips::BtnezT8SltuX16: 214 // TBD: figure out a way to get this or remove the instruction 215 // altogether. 216 return emitFEXT_T8I816_ins(Mips::Btnez16, Mips::SltuRxRy16, MI, BB); 217 case Mips::BteqzT8CmpiX16: return emitFEXT_T8I8I16_ins( 218 Mips::Bteqz16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, false, MI, BB); 219 case Mips::BteqzT8SltiX16: return emitFEXT_T8I8I16_ins( 220 Mips::Bteqz16, Mips::SltiRxImm16, Mips::SltiRxImmX16, true, MI, BB); 221 case Mips::BteqzT8SltiuX16: return emitFEXT_T8I8I16_ins( 222 Mips::Bteqz16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, false, MI, BB); 223 case Mips::BtnezT8CmpiX16: return emitFEXT_T8I8I16_ins( 224 Mips::Btnez16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, false, MI, BB); 225 case Mips::BtnezT8SltiX16: return emitFEXT_T8I8I16_ins( 226 Mips::Btnez16, Mips::SltiRxImm16, Mips::SltiRxImmX16, true, MI, BB); 227 case Mips::BtnezT8SltiuX16: return emitFEXT_T8I8I16_ins( 228 Mips::Btnez16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, false, MI, BB); 229 break; 230 case Mips::SltCCRxRy16: 231 return emitFEXT_CCRX16_ins(Mips::SltRxRy16, MI, BB); 232 break; 233 case Mips::SltiCCRxImmX16: 234 return emitFEXT_CCRXI16_ins 235 (Mips::SltiRxImm16, Mips::SltiRxImmX16, MI, BB); 236 case Mips::SltiuCCRxImmX16: 237 return emitFEXT_CCRXI16_ins 238 (Mips::SltiuRxImm16, Mips::SltiuRxImmX16, MI, BB); 239 case Mips::SltuCCRxRy16: 240 return emitFEXT_CCRX16_ins 241 (Mips::SltuRxRy16, MI, BB); 242 } 243 } 244 245 bool Mips16TargetLowering::isEligibleForTailCallOptimization( 246 const CCState &CCInfo, unsigned NextStackOffset, 247 const MipsFunctionInfo &FI) const { 248 // No tail call optimization for mips16. 249 return false; 250 } 251 252 void Mips16TargetLowering::setMips16HardFloatLibCalls() { 253 for (unsigned I = 0; I != array_lengthof(HardFloatLibCalls); ++I) { 254 assert((I == 0 || HardFloatLibCalls[I - 1] < HardFloatLibCalls[I]) && 255 "Array not sorted!"); 256 if (HardFloatLibCalls[I].Libcall != RTLIB::UNKNOWN_LIBCALL) 257 setLibcallName(HardFloatLibCalls[I].Libcall, HardFloatLibCalls[I].Name); 258 } 259 260 setLibcallName(RTLIB::O_F64, "__mips16_unorddf2"); 261 setLibcallName(RTLIB::O_F32, "__mips16_unordsf2"); 262 } 263 264 // 265 // The Mips16 hard float is a crazy quilt inherited from gcc. I have a much 266 // cleaner way to do all of this but it will have to wait until the traditional 267 // gcc mechanism is completed. 268 // 269 // For Pic, in order for Mips16 code to call Mips32 code which according the abi 270 // have either arguments or returned values placed in floating point registers, 271 // we use a set of helper functions. (This includes functions which return type 272 // complex which on Mips are returned in a pair of floating point registers). 273 // 274 // This is an encoding that we inherited from gcc. 275 // In Mips traditional O32, N32 ABI, floating point numbers are passed in 276 // floating point argument registers 1,2 only when the first and optionally 277 // the second arguments are float (sf) or double (df). 278 // For Mips16 we are only concerned with the situations where floating point 279 // arguments are being passed in floating point registers by the ABI, because 280 // Mips16 mode code cannot execute floating point instructions to load those 281 // values and hence helper functions are needed. 282 // The possibilities are (), (sf), (sf, sf), (sf, df), (df), (df, sf), (df, df) 283 // the helper function suffixs for these are: 284 // 0, 1, 5, 9, 2, 6, 10 285 // this suffix can then be calculated as follows: 286 // for a given argument Arg: 287 // Arg1x, Arg2x = 1 : Arg is sf 288 // 2 : Arg is df 289 // 0: Arg is neither sf or df 290 // So this stub is the string for number Arg1x + Arg2x*4. 291 // However not all numbers between 0 and 10 are possible, we check anyway and 292 // assert if the impossible exists. 293 // 294 295 unsigned int Mips16TargetLowering::getMips16HelperFunctionStubNumber 296 (ArgListTy &Args) const { 297 unsigned int resultNum = 0; 298 if (Args.size() >= 1) { 299 Type *t = Args[0].Ty; 300 if (t->isFloatTy()) { 301 resultNum = 1; 302 } 303 else if (t->isDoubleTy()) { 304 resultNum = 2; 305 } 306 } 307 if (resultNum) { 308 if (Args.size() >=2) { 309 Type *t = Args[1].Ty; 310 if (t->isFloatTy()) { 311 resultNum += 4; 312 } 313 else if (t->isDoubleTy()) { 314 resultNum += 8; 315 } 316 } 317 } 318 return resultNum; 319 } 320 321 // 322 // Prefixes are attached to stub numbers depending on the return type. 323 // return type: float sf_ 324 // double df_ 325 // single complex sc_ 326 // double complext dc_ 327 // others NO PREFIX 328 // 329 // 330 // The full name of a helper function is__mips16_call_stub + 331 // return type dependent prefix + stub number 332 // 333 // FIXME: This is something that probably should be in a different source file 334 // and perhaps done differently but my main purpose is to not waste runtime 335 // on something that we can enumerate in the source. Another possibility is 336 // to have a python script to generate these mapping tables. This will do 337 // for now. There are a whole series of helper function mapping arrays, one 338 // for each return type class as outlined above. There there are 11 possible 339 // entries. Ones with 0 are ones which should never be selected. 340 // 341 // All the arrays are similar except for ones which return neither 342 // sf, df, sc, dc, in which we only care about ones which have sf or df as a 343 // first parameter. 344 // 345 #define P_ "__mips16_call_stub_" 346 #define MAX_STUB_NUMBER 10 347 #define T1 P "1", P "2", 0, 0, P "5", P "6", 0, 0, P "9", P "10" 348 #define T P "0" , T1 349 #define P P_ 350 static char const * vMips16Helper[MAX_STUB_NUMBER+1] = 351 {nullptr, T1 }; 352 #undef P 353 #define P P_ "sf_" 354 static char const * sfMips16Helper[MAX_STUB_NUMBER+1] = 355 { T }; 356 #undef P 357 #define P P_ "df_" 358 static char const * dfMips16Helper[MAX_STUB_NUMBER+1] = 359 { T }; 360 #undef P 361 #define P P_ "sc_" 362 static char const * scMips16Helper[MAX_STUB_NUMBER+1] = 363 { T }; 364 #undef P 365 #define P P_ "dc_" 366 static char const * dcMips16Helper[MAX_STUB_NUMBER+1] = 367 { T }; 368 #undef P 369 #undef P_ 370 371 372 const char* Mips16TargetLowering:: 373 getMips16HelperFunction 374 (Type* RetTy, ArgListTy &Args, bool &needHelper) const { 375 const unsigned int stubNum = getMips16HelperFunctionStubNumber(Args); 376 #ifndef NDEBUG 377 const unsigned int maxStubNum = 10; 378 assert(stubNum <= maxStubNum); 379 const bool validStubNum[maxStubNum+1] = 380 {true, true, true, false, false, true, true, false, false, true, true}; 381 assert(validStubNum[stubNum]); 382 #endif 383 const char *result; 384 if (RetTy->isFloatTy()) { 385 result = sfMips16Helper[stubNum]; 386 } 387 else if (RetTy ->isDoubleTy()) { 388 result = dfMips16Helper[stubNum]; 389 } 390 else if (RetTy->isStructTy()) { 391 // check if it's complex 392 if (RetTy->getNumContainedTypes() == 2) { 393 if ((RetTy->getContainedType(0)->isFloatTy()) && 394 (RetTy->getContainedType(1)->isFloatTy())) { 395 result = scMips16Helper[stubNum]; 396 } 397 else if ((RetTy->getContainedType(0)->isDoubleTy()) && 398 (RetTy->getContainedType(1)->isDoubleTy())) { 399 result = dcMips16Helper[stubNum]; 400 } 401 else { 402 llvm_unreachable("Uncovered condition"); 403 } 404 } 405 else { 406 llvm_unreachable("Uncovered condition"); 407 } 408 } 409 else { 410 if (stubNum == 0) { 411 needHelper = false; 412 return ""; 413 } 414 result = vMips16Helper[stubNum]; 415 } 416 needHelper = true; 417 return result; 418 } 419 420 void Mips16TargetLowering:: 421 getOpndList(SmallVectorImpl<SDValue> &Ops, 422 std::deque< std::pair<unsigned, SDValue> > &RegsToPass, 423 bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage, 424 bool IsCallReloc, CallLoweringInfo &CLI, SDValue Callee, 425 SDValue Chain) const { 426 SelectionDAG &DAG = CLI.DAG; 427 MachineFunction &MF = DAG.getMachineFunction(); 428 MipsFunctionInfo *FuncInfo = MF.getInfo<MipsFunctionInfo>(); 429 const char* Mips16HelperFunction = nullptr; 430 bool NeedMips16Helper = false; 431 432 if (Subtarget.inMips16HardFloat()) { 433 // 434 // currently we don't have symbols tagged with the mips16 or mips32 435 // qualifier so we will assume that we don't know what kind it is. 436 // and generate the helper 437 // 438 bool LookupHelper = true; 439 if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(CLI.Callee)) { 440 Mips16Libcall Find = { RTLIB::UNKNOWN_LIBCALL, S->getSymbol() }; 441 442 if (std::binary_search(std::begin(HardFloatLibCalls), 443 std::end(HardFloatLibCalls), Find)) 444 LookupHelper = false; 445 else { 446 const char *Symbol = S->getSymbol(); 447 Mips16IntrinsicHelperType IntrinsicFind = { Symbol, "" }; 448 const Mips16HardFloatInfo::FuncSignature *Signature = 449 Mips16HardFloatInfo::findFuncSignature(Symbol); 450 if (!IsPICCall && (Signature && (FuncInfo->StubsNeeded.find(Symbol) == 451 FuncInfo->StubsNeeded.end()))) { 452 FuncInfo->StubsNeeded[Symbol] = Signature; 453 // 454 // S2 is normally saved if the stub is for a function which 455 // returns a float or double value and is not otherwise. This is 456 // because more work is required after the function the stub 457 // is calling completes, and so the stub cannot directly return 458 // and the stub has no stack space to store the return address so 459 // S2 is used for that purpose. 460 // In order to take advantage of not saving S2, we need to also 461 // optimize the call in the stub and this requires some further 462 // functionality in MipsAsmPrinter which we don't have yet. 463 // So for now we always save S2. The optimization will be done 464 // in a follow-on patch. 465 // 466 if (1 || (Signature->RetSig != Mips16HardFloatInfo::NoFPRet)) 467 FuncInfo->setSaveS2(); 468 } 469 // one more look at list of intrinsics 470 const Mips16IntrinsicHelperType *Helper = 471 std::lower_bound(std::begin(Mips16IntrinsicHelper), 472 std::end(Mips16IntrinsicHelper), IntrinsicFind); 473 if (Helper != std::end(Mips16IntrinsicHelper) && 474 *Helper == IntrinsicFind) { 475 Mips16HelperFunction = Helper->Helper; 476 NeedMips16Helper = true; 477 LookupHelper = false; 478 } 479 480 } 481 } else if (GlobalAddressSDNode *G = 482 dyn_cast<GlobalAddressSDNode>(CLI.Callee)) { 483 Mips16Libcall Find = { RTLIB::UNKNOWN_LIBCALL, 484 G->getGlobal()->getName().data() }; 485 486 if (std::binary_search(std::begin(HardFloatLibCalls), 487 std::end(HardFloatLibCalls), Find)) 488 LookupHelper = false; 489 } 490 if (LookupHelper) 491 Mips16HelperFunction = 492 getMips16HelperFunction(CLI.RetTy, CLI.getArgs(), NeedMips16Helper); 493 } 494 495 SDValue JumpTarget = Callee; 496 497 // T9 should contain the address of the callee function if 498 // -relocation-model=pic or it is an indirect call. 499 if (IsPICCall || !GlobalOrExternal) { 500 unsigned V0Reg = Mips::V0; 501 if (NeedMips16Helper) { 502 RegsToPass.push_front(std::make_pair(V0Reg, Callee)); 503 JumpTarget = DAG.getExternalSymbol(Mips16HelperFunction, 504 getPointerTy(DAG.getDataLayout())); 505 ExternalSymbolSDNode *S = cast<ExternalSymbolSDNode>(JumpTarget); 506 JumpTarget = getAddrGlobal(S, CLI.DL, JumpTarget.getValueType(), DAG, 507 MipsII::MO_GOT, Chain, 508 FuncInfo->callPtrInfo(S->getSymbol())); 509 } else 510 RegsToPass.push_front(std::make_pair((unsigned)Mips::T9, Callee)); 511 } 512 513 Ops.push_back(JumpTarget); 514 515 MipsTargetLowering::getOpndList(Ops, RegsToPass, IsPICCall, GlobalOrExternal, 516 InternalLinkage, IsCallReloc, CLI, Callee, 517 Chain); 518 } 519 520 MachineBasicBlock * 521 Mips16TargetLowering::emitSel16(unsigned Opc, MachineInstr &MI, 522 MachineBasicBlock *BB) const { 523 if (DontExpandCondPseudos16) 524 return BB; 525 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 526 DebugLoc DL = MI.getDebugLoc(); 527 // To "insert" a SELECT_CC instruction, we actually have to insert the 528 // diamond control-flow pattern. The incoming instruction knows the 529 // destination vreg to set, the condition code register to branch on, the 530 // true/false values to select between, and a branch opcode to use. 531 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 532 MachineFunction::iterator It = ++BB->getIterator(); 533 534 // thisMBB: 535 // ... 536 // TrueVal = ... 537 // setcc r1, r2, r3 538 // bNE r1, r0, copy1MBB 539 // fallthrough --> copy0MBB 540 MachineBasicBlock *thisMBB = BB; 541 MachineFunction *F = BB->getParent(); 542 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); 543 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); 544 F->insert(It, copy0MBB); 545 F->insert(It, sinkMBB); 546 547 // Transfer the remainder of BB and its successor edges to sinkMBB. 548 sinkMBB->splice(sinkMBB->begin(), BB, 549 std::next(MachineBasicBlock::iterator(MI)), BB->end()); 550 sinkMBB->transferSuccessorsAndUpdatePHIs(BB); 551 552 // Next, add the true and fallthrough blocks as its successors. 553 BB->addSuccessor(copy0MBB); 554 BB->addSuccessor(sinkMBB); 555 556 BuildMI(BB, DL, TII->get(Opc)) 557 .addReg(MI.getOperand(3).getReg()) 558 .addMBB(sinkMBB); 559 560 // copy0MBB: 561 // %FalseValue = ... 562 // # fallthrough to sinkMBB 563 BB = copy0MBB; 564 565 // Update machine-CFG edges 566 BB->addSuccessor(sinkMBB); 567 568 // sinkMBB: 569 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ] 570 // ... 571 BB = sinkMBB; 572 573 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg()) 574 .addReg(MI.getOperand(1).getReg()) 575 .addMBB(thisMBB) 576 .addReg(MI.getOperand(2).getReg()) 577 .addMBB(copy0MBB); 578 579 MI.eraseFromParent(); // The pseudo instruction is gone now. 580 return BB; 581 } 582 583 MachineBasicBlock * 584 Mips16TargetLowering::emitSelT16(unsigned Opc1, unsigned Opc2, MachineInstr &MI, 585 MachineBasicBlock *BB) const { 586 if (DontExpandCondPseudos16) 587 return BB; 588 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 589 DebugLoc DL = MI.getDebugLoc(); 590 // To "insert" a SELECT_CC instruction, we actually have to insert the 591 // diamond control-flow pattern. The incoming instruction knows the 592 // destination vreg to set, the condition code register to branch on, the 593 // true/false values to select between, and a branch opcode to use. 594 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 595 MachineFunction::iterator It = ++BB->getIterator(); 596 597 // thisMBB: 598 // ... 599 // TrueVal = ... 600 // setcc r1, r2, r3 601 // bNE r1, r0, copy1MBB 602 // fallthrough --> copy0MBB 603 MachineBasicBlock *thisMBB = BB; 604 MachineFunction *F = BB->getParent(); 605 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); 606 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); 607 F->insert(It, copy0MBB); 608 F->insert(It, sinkMBB); 609 610 // Transfer the remainder of BB and its successor edges to sinkMBB. 611 sinkMBB->splice(sinkMBB->begin(), BB, 612 std::next(MachineBasicBlock::iterator(MI)), BB->end()); 613 sinkMBB->transferSuccessorsAndUpdatePHIs(BB); 614 615 // Next, add the true and fallthrough blocks as its successors. 616 BB->addSuccessor(copy0MBB); 617 BB->addSuccessor(sinkMBB); 618 619 BuildMI(BB, DL, TII->get(Opc2)) 620 .addReg(MI.getOperand(3).getReg()) 621 .addReg(MI.getOperand(4).getReg()); 622 BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB); 623 624 // copy0MBB: 625 // %FalseValue = ... 626 // # fallthrough to sinkMBB 627 BB = copy0MBB; 628 629 // Update machine-CFG edges 630 BB->addSuccessor(sinkMBB); 631 632 // sinkMBB: 633 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ] 634 // ... 635 BB = sinkMBB; 636 637 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg()) 638 .addReg(MI.getOperand(1).getReg()) 639 .addMBB(thisMBB) 640 .addReg(MI.getOperand(2).getReg()) 641 .addMBB(copy0MBB); 642 643 MI.eraseFromParent(); // The pseudo instruction is gone now. 644 return BB; 645 646 } 647 648 MachineBasicBlock * 649 Mips16TargetLowering::emitSeliT16(unsigned Opc1, unsigned Opc2, 650 MachineInstr &MI, 651 MachineBasicBlock *BB) const { 652 if (DontExpandCondPseudos16) 653 return BB; 654 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 655 DebugLoc DL = MI.getDebugLoc(); 656 // To "insert" a SELECT_CC instruction, we actually have to insert the 657 // diamond control-flow pattern. The incoming instruction knows the 658 // destination vreg to set, the condition code register to branch on, the 659 // true/false values to select between, and a branch opcode to use. 660 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 661 MachineFunction::iterator It = ++BB->getIterator(); 662 663 // thisMBB: 664 // ... 665 // TrueVal = ... 666 // setcc r1, r2, r3 667 // bNE r1, r0, copy1MBB 668 // fallthrough --> copy0MBB 669 MachineBasicBlock *thisMBB = BB; 670 MachineFunction *F = BB->getParent(); 671 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); 672 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); 673 F->insert(It, copy0MBB); 674 F->insert(It, sinkMBB); 675 676 // Transfer the remainder of BB and its successor edges to sinkMBB. 677 sinkMBB->splice(sinkMBB->begin(), BB, 678 std::next(MachineBasicBlock::iterator(MI)), BB->end()); 679 sinkMBB->transferSuccessorsAndUpdatePHIs(BB); 680 681 // Next, add the true and fallthrough blocks as its successors. 682 BB->addSuccessor(copy0MBB); 683 BB->addSuccessor(sinkMBB); 684 685 BuildMI(BB, DL, TII->get(Opc2)) 686 .addReg(MI.getOperand(3).getReg()) 687 .addImm(MI.getOperand(4).getImm()); 688 BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB); 689 690 // copy0MBB: 691 // %FalseValue = ... 692 // # fallthrough to sinkMBB 693 BB = copy0MBB; 694 695 // Update machine-CFG edges 696 BB->addSuccessor(sinkMBB); 697 698 // sinkMBB: 699 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ] 700 // ... 701 BB = sinkMBB; 702 703 BuildMI(*BB, BB->begin(), DL, TII->get(Mips::PHI), MI.getOperand(0).getReg()) 704 .addReg(MI.getOperand(1).getReg()) 705 .addMBB(thisMBB) 706 .addReg(MI.getOperand(2).getReg()) 707 .addMBB(copy0MBB); 708 709 MI.eraseFromParent(); // The pseudo instruction is gone now. 710 return BB; 711 712 } 713 714 MachineBasicBlock * 715 Mips16TargetLowering::emitFEXT_T8I816_ins(unsigned BtOpc, unsigned CmpOpc, 716 MachineInstr &MI, 717 MachineBasicBlock *BB) const { 718 if (DontExpandCondPseudos16) 719 return BB; 720 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 721 unsigned regX = MI.getOperand(0).getReg(); 722 unsigned regY = MI.getOperand(1).getReg(); 723 MachineBasicBlock *target = MI.getOperand(2).getMBB(); 724 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(CmpOpc)) 725 .addReg(regX) 726 .addReg(regY); 727 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(BtOpc)).addMBB(target); 728 MI.eraseFromParent(); // The pseudo instruction is gone now. 729 return BB; 730 } 731 732 MachineBasicBlock *Mips16TargetLowering::emitFEXT_T8I8I16_ins( 733 unsigned BtOpc, unsigned CmpiOpc, unsigned CmpiXOpc, bool ImmSigned, 734 MachineInstr &MI, MachineBasicBlock *BB) const { 735 if (DontExpandCondPseudos16) 736 return BB; 737 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 738 unsigned regX = MI.getOperand(0).getReg(); 739 int64_t imm = MI.getOperand(1).getImm(); 740 MachineBasicBlock *target = MI.getOperand(2).getMBB(); 741 unsigned CmpOpc; 742 if (isUInt<8>(imm)) 743 CmpOpc = CmpiOpc; 744 else if ((!ImmSigned && isUInt<16>(imm)) || 745 (ImmSigned && isInt<16>(imm))) 746 CmpOpc = CmpiXOpc; 747 else 748 llvm_unreachable("immediate field not usable"); 749 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(CmpOpc)).addReg(regX).addImm(imm); 750 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(BtOpc)).addMBB(target); 751 MI.eraseFromParent(); // The pseudo instruction is gone now. 752 return BB; 753 } 754 755 static unsigned Mips16WhichOp8uOr16simm 756 (unsigned shortOp, unsigned longOp, int64_t Imm) { 757 if (isUInt<8>(Imm)) 758 return shortOp; 759 else if (isInt<16>(Imm)) 760 return longOp; 761 else 762 llvm_unreachable("immediate field not usable"); 763 } 764 765 MachineBasicBlock * 766 Mips16TargetLowering::emitFEXT_CCRX16_ins(unsigned SltOpc, MachineInstr &MI, 767 MachineBasicBlock *BB) const { 768 if (DontExpandCondPseudos16) 769 return BB; 770 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 771 unsigned CC = MI.getOperand(0).getReg(); 772 unsigned regX = MI.getOperand(1).getReg(); 773 unsigned regY = MI.getOperand(2).getReg(); 774 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SltOpc)) 775 .addReg(regX) 776 .addReg(regY); 777 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(Mips::MoveR3216), CC) 778 .addReg(Mips::T8); 779 MI.eraseFromParent(); // The pseudo instruction is gone now. 780 return BB; 781 } 782 783 MachineBasicBlock * 784 Mips16TargetLowering::emitFEXT_CCRXI16_ins(unsigned SltiOpc, unsigned SltiXOpc, 785 MachineInstr &MI, 786 MachineBasicBlock *BB) const { 787 if (DontExpandCondPseudos16) 788 return BB; 789 const TargetInstrInfo *TII = Subtarget.getInstrInfo(); 790 unsigned CC = MI.getOperand(0).getReg(); 791 unsigned regX = MI.getOperand(1).getReg(); 792 int64_t Imm = MI.getOperand(2).getImm(); 793 unsigned SltOpc = Mips16WhichOp8uOr16simm(SltiOpc, SltiXOpc, Imm); 794 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SltOpc)).addReg(regX).addImm(Imm); 795 BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(Mips::MoveR3216), CC) 796 .addReg(Mips::T8); 797 MI.eraseFromParent(); // The pseudo instruction is gone now. 798 return BB; 799 800 } 801
