lib/Support/ARMTargetParser.cpp

   1 //===-- ARMTargetParser - Parser for ARM target features --------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements a target parser to recognise ARM hardware features
  10 // such as FPU/CPU/ARCH/extensions and specific support such as HWDIV.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Support/ARMTargetParser.h"
  15 #include "llvm/ADT/StringSwitch.h"
  16 #include <cctype>
  17
  18 using namespace llvm;
  19
  20 static StringRef getHWDivSynonym(StringRef HWDiv) {
  21   return StringSwitch<StringRef>(HWDiv)
  22       .Case("thumb,arm", "arm,thumb")
  23       .Default(HWDiv);
  24 }
  25
  26 // Allows partial match, ex. "v7a" matches "armv7a".
  27 ARM::ArchKind ARM::parseArch(StringRef Arch) {
  28   Arch = getCanonicalArchName(Arch);
  29   StringRef Syn = getArchSynonym(Arch);
  30   for (const auto A : ARCHNames) {
  31     if (A.getName().endswith(Syn))
  32       return A.ID;
  33   }
  34   return ArchKind::INVALID;
  35 }
  36
  37 // Version number (ex. v7 = 7).
  38 unsigned ARM::parseArchVersion(StringRef Arch) {
  39   Arch = getCanonicalArchName(Arch);
  40   switch (parseArch(Arch)) {
  41   case ArchKind::ARMV2:
  42   case ArchKind::ARMV2A:
  43     return 2;
  44   case ArchKind::ARMV3:
  45   case ArchKind::ARMV3M:
  46     return 3;
  47   case ArchKind::ARMV4:
  48   case ArchKind::ARMV4T:
  49     return 4;
  50   case ArchKind::ARMV5T:
  51   case ArchKind::ARMV5TE:
  52   case ArchKind::IWMMXT:
  53   case ArchKind::IWMMXT2:
  54   case ArchKind::XSCALE:
  55   case ArchKind::ARMV5TEJ:
  56     return 5;
  57   case ArchKind::ARMV6:
  58   case ArchKind::ARMV6K:
  59   case ArchKind::ARMV6T2:
  60   case ArchKind::ARMV6KZ:
  61   case ArchKind::ARMV6M:
  62     return 6;
  63   case ArchKind::ARMV7A:
  64   case ArchKind::ARMV7VE:
  65   case ArchKind::ARMV7R:
  66   case ArchKind::ARMV7M:
  67   case ArchKind::ARMV7S:
  68   case ArchKind::ARMV7EM:
  69   case ArchKind::ARMV7K:
  70     return 7;
  71   case ArchKind::ARMV8A:
  72   case ArchKind::ARMV8_1A:
  73   case ArchKind::ARMV8_2A:
  74   case ArchKind::ARMV8_3A:
  75   case ArchKind::ARMV8_4A:
  76   case ArchKind::ARMV8_5A:
  77   case ArchKind::ARMV8R:
  78   case ArchKind::ARMV8MBaseline:
  79   case ArchKind::ARMV8MMainline:
  80   case ArchKind::ARMV8_1MMainline:
  81     return 8;
  82   case ArchKind::INVALID:
  83     return 0;
  84   }
  85   llvm_unreachable("Unhandled architecture");
  86 }
  87
  88 // Profile A/R/M
  89 ARM::ProfileKind ARM::parseArchProfile(StringRef Arch) {
  90   Arch = getCanonicalArchName(Arch);
  91   switch (parseArch(Arch)) {
  92   case ArchKind::ARMV6M:
  93   case ArchKind::ARMV7M:
  94   case ArchKind::ARMV7EM:
  95   case ArchKind::ARMV8MMainline:
  96   case ArchKind::ARMV8MBaseline:
  97   case ArchKind::ARMV8_1MMainline:
  98     return ProfileKind::M;
  99   case ArchKind::ARMV7R:
 100   case ArchKind::ARMV8R:
 101     return ProfileKind::R;
 102   case ArchKind::ARMV7A:
 103   case ArchKind::ARMV7VE:
 104   case ArchKind::ARMV7K:
 105   case ArchKind::ARMV8A:
 106   case ArchKind::ARMV8_1A:
 107   case ArchKind::ARMV8_2A:
 108   case ArchKind::ARMV8_3A:
 109   case ArchKind::ARMV8_4A:
 110   case ArchKind::ARMV8_5A:
 111     return ProfileKind::A;
 112   case ArchKind::ARMV2:
 113   case ArchKind::ARMV2A:
 114   case ArchKind::ARMV3:
 115   case ArchKind::ARMV3M:
 116   case ArchKind::ARMV4:
 117   case ArchKind::ARMV4T:
 118   case ArchKind::ARMV5T:
 119   case ArchKind::ARMV5TE:
 120   case ArchKind::ARMV5TEJ:
 121   case ArchKind::ARMV6:
 122   case ArchKind::ARMV6K:
 123   case ArchKind::ARMV6T2:
 124   case ArchKind::ARMV6KZ:
 125   case ArchKind::ARMV7S:
 126   case ArchKind::IWMMXT:
 127   case ArchKind::IWMMXT2:
 128   case ArchKind::XSCALE:
 129   case ArchKind::INVALID:
 130     return ProfileKind::INVALID;
 131   }
 132   llvm_unreachable("Unhandled architecture");
 133 }
 134
 135 StringRef ARM::getArchSynonym(StringRef Arch) {
 136   return StringSwitch<StringRef>(Arch)
 137       .Case("v5", "v5t")
 138       .Case("v5e", "v5te")
 139       .Case("v6j", "v6")
 140       .Case("v6hl", "v6k")
 141       .Cases("v6m", "v6sm", "v6s-m", "v6-m")
 142       .Cases("v6z", "v6zk", "v6kz")
 143       .Cases("v7", "v7a", "v7hl", "v7l", "v7-a")
 144       .Case("v7r", "v7-r")
 145       .Case("v7m", "v7-m")
 146       .Case("v7em", "v7e-m")
 147       .Cases("v8", "v8a", "v8l", "aarch64", "arm64", "v8-a")
 148       .Case("v8.1a", "v8.1-a")
 149       .Case("v8.2a", "v8.2-a")
 150       .Case("v8.3a", "v8.3-a")
 151       .Case("v8.4a", "v8.4-a")
 152       .Case("v8.5a", "v8.5-a")
 153       .Case("v8r", "v8-r")
 154       .Case("v8m.base", "v8-m.base")
 155       .Case("v8m.main", "v8-m.main")
 156       .Case("v8.1m.main", "v8.1-m.main")
 157       .Default(Arch);
 158 }
 159
 160 bool ARM::getFPUFeatures(unsigned FPUKind, std::vector<StringRef> &Features) {
 161
 162   if (FPUKind >= FK_LAST || FPUKind == FK_INVALID)
 163     return false;
 164
 165   static const struct FPUFeatureNameInfo {
 166     const char *PlusName, *MinusName;
 167     FPUVersion MinVersion;
 168     FPURestriction MaxRestriction;
 169   } FPUFeatureInfoList[] = {
 170     // We have to specify the + and - versions of the name in full so
 171     // that we can return them as static StringRefs.
 172     //
 173     // Also, the SubtargetFeatures ending in just "sp" are listed here
 174     // under FPURestriction::None, which is the only FPURestriction in
 175     // which they would be valid (since FPURestriction::SP doesn't
 176     // exist).
 177
 178     {"+fpregs", "-fpregs", FPUVersion::VFPV2, FPURestriction::SP_D16},
 179     {"+vfp2", "-vfp2", FPUVersion::VFPV2, FPURestriction::D16},
 180     {"+vfp2sp", "-vfp2sp", FPUVersion::VFPV2, FPURestriction::SP_D16},
 181     {"+vfp3", "-vfp3", FPUVersion::VFPV3, FPURestriction::None},
 182     {"+vfp3d16", "-vfp3d16", FPUVersion::VFPV3, FPURestriction::D16},
 183     {"+vfp3d16sp", "-vfp3d16sp", FPUVersion::VFPV3, FPURestriction::SP_D16},
 184     {"+vfp3sp", "-vfp3sp", FPUVersion::VFPV3, FPURestriction::None},
 185     {"+fp16", "-fp16", FPUVersion::VFPV3_FP16, FPURestriction::SP_D16},
 186     {"+vfp4", "-vfp4", FPUVersion::VFPV4, FPURestriction::None},
 187     {"+vfp4d16", "-vfp4d16", FPUVersion::VFPV4, FPURestriction::D16},
 188     {"+vfp4d16sp", "-vfp4d16sp", FPUVersion::VFPV4, FPURestriction::SP_D16},
 189     {"+vfp4sp", "-vfp4sp", FPUVersion::VFPV4, FPURestriction::None},
 190     {"+fp-armv8", "-fp-armv8", FPUVersion::VFPV5, FPURestriction::None},
 191     {"+fp-armv8d16", "-fp-armv8d16", FPUVersion::VFPV5, FPURestriction::D16},
 192     {"+fp-armv8d16sp", "-fp-armv8d16sp", FPUVersion::VFPV5, FPURestriction::SP_D16},
 193     {"+fp-armv8sp", "-fp-armv8sp", FPUVersion::VFPV5, FPURestriction::None},
 194     {"+fullfp16", "-fullfp16", FPUVersion::VFPV5_FULLFP16, FPURestriction::SP_D16},
 195     {"+fp64", "-fp64", FPUVersion::VFPV2, FPURestriction::D16},
 196     {"+d32", "-d32", FPUVersion::VFPV3, FPURestriction::None},
 197   };
 198
 199   for (const auto &Info: FPUFeatureInfoList) {
 200     if (FPUNames[FPUKind].FPUVer >= Info.MinVersion &&
 201         FPUNames[FPUKind].Restriction <= Info.MaxRestriction)
 202       Features.push_back(Info.PlusName);
 203     else
 204       Features.push_back(Info.MinusName);
 205   }
 206
 207   static const struct NeonFeatureNameInfo {
 208     const char *PlusName, *MinusName;
 209     NeonSupportLevel MinSupportLevel;
 210   } NeonFeatureInfoList[] = {
 211     {"+neon", "-neon", NeonSupportLevel::Neon},
 212     {"+crypto", "-crypto", NeonSupportLevel::Crypto},
 213   };
 214
 215   for (const auto &Info: NeonFeatureInfoList) {
 216     if (FPUNames[FPUKind].NeonSupport >= Info.MinSupportLevel)
 217       Features.push_back(Info.PlusName);
 218     else
 219       Features.push_back(Info.MinusName);
 220   }
 221
 222   return true;
 223 }
 224
 225 // Little/Big endian
 226 ARM::EndianKind ARM::parseArchEndian(StringRef Arch) {
 227   if (Arch.startswith("armeb") || Arch.startswith("thumbeb") ||
 228       Arch.startswith("aarch64_be"))
 229     return EndianKind::BIG;
 230
 231   if (Arch.startswith("arm") || Arch.startswith("thumb")) {
 232     if (Arch.endswith("eb"))
 233       return EndianKind::BIG;
 234     else
 235       return EndianKind::LITTLE;
 236   }
 237
 238   if (Arch.startswith("aarch64") || Arch.startswith("aarch64_32"))
 239     return EndianKind::LITTLE;
 240
 241   return EndianKind::INVALID;
 242 }
 243
 244 // ARM, Thumb, AArch64
 245 ARM::ISAKind ARM::parseArchISA(StringRef Arch) {
 246   return StringSwitch<ISAKind>(Arch)
 247       .StartsWith("aarch64", ISAKind::AARCH64)
 248       .StartsWith("arm64", ISAKind::AARCH64)
 249       .StartsWith("thumb", ISAKind::THUMB)
 250       .StartsWith("arm", ISAKind::ARM)
 251       .Default(ISAKind::INVALID);
 252 }
 253
 254 unsigned ARM::parseFPU(StringRef FPU) {
 255   StringRef Syn = getFPUSynonym(FPU);
 256   for (const auto F : FPUNames) {
 257     if (Syn == F.getName())
 258       return F.ID;
 259   }
 260   return FK_INVALID;
 261 }
 262
 263 ARM::NeonSupportLevel ARM::getFPUNeonSupportLevel(unsigned FPUKind) {
 264   if (FPUKind >= FK_LAST)
 265     return NeonSupportLevel::None;
 266   return FPUNames[FPUKind].NeonSupport;
 267 }
 268
 269 // MArch is expected to be of the form (arm|thumb)?(eb)?(v.+)?(eb)?, but
 270 // (iwmmxt|xscale)(eb)? is also permitted. If the former, return
 271 // "v.+", if the latter, return unmodified string, minus 'eb'.
 272 // If invalid, return empty string.
 273 StringRef ARM::getCanonicalArchName(StringRef Arch) {
 274   size_t offset = StringRef::npos;
 275   StringRef A = Arch;
 276   StringRef Error = "";
 277
 278   // Begins with "arm" / "thumb", move past it.
 279   if (A.startswith("arm64_32"))
 280     offset = 8;
 281   else if (A.startswith("arm64"))
 282     offset = 5;
 283   else if (A.startswith("aarch64_32"))
 284     offset = 10;
 285   else if (A.startswith("arm"))
 286     offset = 3;
 287   else if (A.startswith("thumb"))
 288     offset = 5;
 289   else if (A.startswith("aarch64")) {
 290     offset = 7;
 291     // AArch64 uses "_be", not "eb" suffix.
 292     if (A.find("eb") != StringRef::npos)
 293       return Error;
 294     if (A.substr(offset, 3) == "_be")
 295       offset += 3;
 296   }
 297
 298   // Ex. "armebv7", move past the "eb".
 299   if (offset != StringRef::npos && A.substr(offset, 2) == "eb")
 300     offset += 2;
 301   // Or, if it ends with eb ("armv7eb"), chop it off.
 302   else if (A.endswith("eb"))
 303     A = A.substr(0, A.size() - 2);
 304   // Trim the head
 305   if (offset != StringRef::npos)
 306     A = A.substr(offset);
 307
 308   // Empty string means offset reached the end, which means it's valid.
 309   if (A.empty())
 310     return Arch;
 311
 312   // Only match non-marketing names
 313   if (offset != StringRef::npos) {
 314     // Must start with 'vN'.
 315     if (A.size() >= 2 && (A[0] != 'v' || !std::isdigit(A[1])))
 316       return Error;
 317     // Can't have an extra 'eb'.
 318     if (A.find("eb") != StringRef::npos)
 319       return Error;
 320   }
 321
 322   // Arch will either be a 'v' name (v7a) or a marketing name (xscale).
 323   return A;
 324 }
 325
 326 StringRef ARM::getFPUSynonym(StringRef FPU) {
 327   return StringSwitch<StringRef>(FPU)
 328       .Cases("fpa", "fpe2", "fpe3", "maverick", "invalid") // Unsupported
 329       .Case("vfp2", "vfpv2")
 330       .Case("vfp3", "vfpv3")
 331       .Case("vfp4", "vfpv4")
 332       .Case("vfp3-d16", "vfpv3-d16")
 333       .Case("vfp4-d16", "vfpv4-d16")
 334       .Cases("fp4-sp-d16", "vfpv4-sp-d16", "fpv4-sp-d16")
 335       .Cases("fp4-dp-d16", "fpv4-dp-d16", "vfpv4-d16")
 336       .Case("fp5-sp-d16", "fpv5-sp-d16")
 337       .Cases("fp5-dp-d16", "fpv5-dp-d16", "fpv5-d16")
 338       // FIXME: Clang uses it, but it's bogus, since neon defaults to vfpv3.
 339       .Case("neon-vfpv3", "neon")
 340       .Default(FPU);
 341 }
 342
 343 StringRef ARM::getFPUName(unsigned FPUKind) {
 344   if (FPUKind >= FK_LAST)
 345     return StringRef();
 346   return FPUNames[FPUKind].getName();
 347 }
 348
 349 ARM::FPUVersion ARM::getFPUVersion(unsigned FPUKind) {
 350   if (FPUKind >= FK_LAST)
 351     return FPUVersion::NONE;
 352   return FPUNames[FPUKind].FPUVer;
 353 }
 354
 355 ARM::FPURestriction ARM::getFPURestriction(unsigned FPUKind) {
 356   if (FPUKind >= FK_LAST)
 357     return FPURestriction::None;
 358   return FPUNames[FPUKind].Restriction;
 359 }
 360
 361 unsigned ARM::getDefaultFPU(StringRef CPU, ARM::ArchKind AK) {
 362   if (CPU == "generic")
 363     return ARM::ARCHNames[static_cast<unsigned>(AK)].DefaultFPU;
 364
 365   return StringSwitch<unsigned>(CPU)
 366 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
 367   .Case(NAME, DEFAULT_FPU)
 368 #include "llvm/Support/ARMTargetParser.def"
 369    .Default(ARM::FK_INVALID);
 370 }
 371
 372 unsigned ARM::getDefaultExtensions(StringRef CPU, ARM::ArchKind AK) {
 373   if (CPU == "generic")
 374     return ARM::ARCHNames[static_cast<unsigned>(AK)].ArchBaseExtensions;
 375
 376   return StringSwitch<unsigned>(CPU)
 377 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
 378   .Case(NAME,                                                                  \
 379         ARCHNames[static_cast<unsigned>(ArchKind::ID)].ArchBaseExtensions |    \
 380             DEFAULT_EXT)
 381 #include "llvm/Support/ARMTargetParser.def"
 382   .Default(ARM::AEK_INVALID);
 383 }
 384
 385 bool ARM::getHWDivFeatures(unsigned HWDivKind,
 386                            std::vector<StringRef> &Features) {
 387
 388   if (HWDivKind == AEK_INVALID)
 389     return false;
 390
 391   if (HWDivKind & AEK_HWDIVARM)
 392     Features.push_back("+hwdiv-arm");
 393   else
 394     Features.push_back("-hwdiv-arm");
 395
 396   if (HWDivKind & AEK_HWDIVTHUMB)
 397     Features.push_back("+hwdiv");
 398   else
 399     Features.push_back("-hwdiv");
 400
 401   return true;
 402 }
 403
 404 bool ARM::getExtensionFeatures(unsigned Extensions,
 405                                std::vector<StringRef> &Features) {
 406
 407   if (Extensions == AEK_INVALID)
 408     return false;
 409
 410   for (const auto AE : ARCHExtNames) {
 411     if ((Extensions & AE.ID) == AE.ID && AE.Feature)
 412       Features.push_back(AE.Feature);
 413     else if (AE.NegFeature)
 414       Features.push_back(AE.NegFeature);
 415   }
 416
 417   return getHWDivFeatures(Extensions, Features);
 418 }
 419
 420 StringRef ARM::getArchName(ARM::ArchKind AK) {
 421   return ARCHNames[static_cast<unsigned>(AK)].getName();
 422 }
 423
 424 StringRef ARM::getCPUAttr(ARM::ArchKind AK) {
 425   return ARCHNames[static_cast<unsigned>(AK)].getCPUAttr();
 426 }
 427
 428 StringRef ARM::getSubArch(ARM::ArchKind AK) {
 429   return ARCHNames[static_cast<unsigned>(AK)].getSubArch();
 430 }
 431
 432 unsigned ARM::getArchAttr(ARM::ArchKind AK) {
 433   return ARCHNames[static_cast<unsigned>(AK)].ArchAttr;
 434 }
 435
 436 StringRef ARM::getArchExtName(unsigned ArchExtKind) {
 437   for (const auto AE : ARCHExtNames) {
 438     if (ArchExtKind == AE.ID)
 439       return AE.getName();
 440   }
 441   return StringRef();
 442 }
 443
 444 static bool stripNegationPrefix(StringRef &Name) {
 445   if (Name.startswith("no")) {
 446     Name = Name.substr(2);
 447     return true;
 448   }
 449   return false;
 450 }
 451
 452 StringRef ARM::getArchExtFeature(StringRef ArchExt) {
 453   bool Negated = stripNegationPrefix(ArchExt);
 454   for (const auto AE : ARCHExtNames) {
 455     if (AE.Feature && ArchExt == AE.getName())
 456       return StringRef(Negated ? AE.NegFeature : AE.Feature);
 457   }
 458
 459   return StringRef();
 460 }
 461
 462 static unsigned findDoublePrecisionFPU(unsigned InputFPUKind) {
 463   const ARM::FPUName &InputFPU = ARM::FPUNames[InputFPUKind];
 464
 465   // If the input FPU already supports double-precision, then there
 466   // isn't any different FPU we can return here.
 467   //
 468   // The current available FPURestriction values are None (no
 469   // restriction), D16 (only 16 d-regs) and SP_D16 (16 d-regs
 470   // and single precision only); there's no value representing
 471   // SP restriction without D16. So this test just means 'is it
 472   // SP only?'.
 473   if (InputFPU.Restriction != ARM::FPURestriction::SP_D16)
 474     return ARM::FK_INVALID;
 475
 476   // Otherwise, look for an FPU entry with all the same fields, except
 477   // that SP_D16 has been replaced with just D16, representing adding
 478   // double precision and not changing anything else.
 479   for (const ARM::FPUName &CandidateFPU : ARM::FPUNames) {
 480     if (CandidateFPU.FPUVer == InputFPU.FPUVer &&
 481         CandidateFPU.NeonSupport == InputFPU.NeonSupport &&
 482         CandidateFPU.Restriction == ARM::FPURestriction::D16) {
 483       return CandidateFPU.ID;
 484     }
 485   }
 486
 487   // nothing found
 488   return ARM::FK_INVALID;
 489 }
 490
 491 static unsigned getAEKID(StringRef ArchExtName) {
 492   for (const auto AE : ARM::ARCHExtNames)
 493     if (AE.getName() == ArchExtName)
 494       return AE.ID;
 495   return ARM::AEK_INVALID;
 496 }
 497
 498 bool ARM::appendArchExtFeatures(
 499   StringRef CPU, ARM::ArchKind AK, StringRef ArchExt,
 500   std::vector<StringRef> &Features) {
 501
 502   size_t StartingNumFeatures = Features.size();
 503   const bool Negated = stripNegationPrefix(ArchExt);
 504   unsigned ID = getAEKID(ArchExt);
 505
 506   if (ID == AEK_INVALID)
 507     return false;
 508
 509   for (const auto AE : ARCHExtNames) {
 510     if (Negated && (AE.ID & ID) == ID && AE.NegFeature)
 511       Features.push_back(AE.NegFeature);
 512     else if (AE.ID == ID && AE.Feature)
 513       Features.push_back(AE.Feature);
 514   }
 515
 516   if (CPU == "")
 517     CPU = "generic";
 518
 519   if (ArchExt == "fp" || ArchExt == "fp.dp") {
 520     unsigned FPUKind;
 521     if (ArchExt == "fp.dp") {
 522       if (Negated) {
 523         Features.push_back("-fp64");
 524         return true;
 525       }
 526       FPUKind = findDoublePrecisionFPU(getDefaultFPU(CPU, AK));
 527     } else if (Negated) {
 528       FPUKind = ARM::FK_NONE;
 529     } else {
 530       FPUKind = getDefaultFPU(CPU, AK);
 531     }
 532     return ARM::getFPUFeatures(FPUKind, Features);
 533   }
 534   return StartingNumFeatures != Features.size();
 535 }
 536
 537 StringRef ARM::getHWDivName(unsigned HWDivKind) {
 538   for (const auto D : HWDivNames) {
 539     if (HWDivKind == D.ID)
 540       return D.getName();
 541   }
 542   return StringRef();
 543 }
 544
 545 StringRef ARM::getDefaultCPU(StringRef Arch) {
 546   ArchKind AK = parseArch(Arch);
 547   if (AK == ArchKind::INVALID)
 548     return StringRef();
 549
 550   // Look for multiple AKs to find the default for pair AK+Name.
 551   for (const auto CPU : CPUNames) {
 552     if (CPU.ArchID == AK && CPU.Default)
 553       return CPU.getName();
 554   }
 555
 556   // If we can't find a default then target the architecture instead
 557   return "generic";
 558 }
 559
 560 unsigned ARM::parseHWDiv(StringRef HWDiv) {
 561   StringRef Syn = getHWDivSynonym(HWDiv);
 562   for (const auto D : HWDivNames) {
 563     if (Syn == D.getName())
 564       return D.ID;
 565   }
 566   return AEK_INVALID;
 567 }
 568
 569 unsigned ARM::parseArchExt(StringRef ArchExt) {
 570   for (const auto A : ARCHExtNames) {
 571     if (ArchExt == A.getName())
 572       return A.ID;
 573   }
 574   return AEK_INVALID;
 575 }
 576
 577 ARM::ArchKind ARM::parseCPUArch(StringRef CPU) {
 578   for (const auto C : CPUNames) {
 579     if (CPU == C.getName())
 580       return C.ArchID;
 581   }
 582   return ArchKind::INVALID;
 583 }
 584
 585 void ARM::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values) {
 586   for (const CpuNames<ArchKind> &Arch : CPUNames) {
 587     if (Arch.ArchID != ArchKind::INVALID)
 588       Values.push_back(Arch.getName());
 589   }
 590 }
 591
 592 StringRef ARM::computeDefaultTargetABI(const Triple &TT, StringRef CPU) {
 593   StringRef ArchName =
 594       CPU.empty() ? TT.getArchName() : getArchName(parseCPUArch(CPU));
 595
 596   if (TT.isOSBinFormatMachO()) {
 597     if (TT.getEnvironment() == Triple::EABI ||
 598         TT.getOS() == Triple::UnknownOS ||
 599         parseArchProfile(ArchName) == ProfileKind::M)
 600       return "aapcs";
 601     if (TT.isWatchABI())
 602       return "aapcs16";
 603     return "apcs-gnu";
 604   } else if (TT.isOSWindows())
 605     // FIXME: this is invalid for WindowsCE.
 606     return "aapcs";
 607
 608   // Select the default based on the platform.
 609   switch (TT.getEnvironment()) {
 610   case Triple::Android:
 611   case Triple::GNUEABI:
 612   case Triple::GNUEABIHF:
 613   case Triple::MuslEABI:
 614   case Triple::MuslEABIHF:
 615     return "aapcs-linux";
 616   case Triple::EABIHF:
 617   case Triple::EABI:
 618     return "aapcs";
 619   default:
 620     if (TT.isOSNetBSD())
 621       return "apcs-gnu";
 622     if (TT.isOSOpenBSD())
 623       return "aapcs-linux";
 624     return "aapcs";
 625   }
 626 }