llvm/lib/TargetParser/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/TargetParser/ARMTargetParser.h"
  15 #include "llvm/ADT/StringSwitch.h"
  16 #include "llvm/Support/Format.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include "llvm/TargetParser/ARMTargetParserCommon.h"
  19 #include "llvm/TargetParser/Triple.h"
  20 #include <cctype>
  21
  22 using namespace llvm;
  23
  24 static StringRef getHWDivSynonym(StringRef HWDiv) {
  25   return StringSwitch<StringRef>(HWDiv)
  26       .Case("thumb,arm", "arm,thumb")
  27       .Default(HWDiv);
  28 }
  29
  30 // Allows partial match, ex. "v7a" matches "armv7a".
  31 ARM::ArchKind ARM::parseArch(StringRef Arch) {
  32   Arch = getCanonicalArchName(Arch);
  33   StringRef Syn = getArchSynonym(Arch);
  34   for (const auto &A : ARMArchNames) {
  35     if (A.Name.ends_with(Syn))
  36       return A.ID;
  37   }
  38   return ArchKind::INVALID;
  39 }
  40
  41 // Version number (ex. v7 = 7).
  42 unsigned ARM::parseArchVersion(StringRef Arch) {
  43   Arch = getCanonicalArchName(Arch);
  44   switch (parseArch(Arch)) {
  45   case ArchKind::ARMV4:
  46   case ArchKind::ARMV4T:
  47     return 4;
  48   case ArchKind::ARMV5T:
  49   case ArchKind::ARMV5TE:
  50   case ArchKind::IWMMXT:
  51   case ArchKind::IWMMXT2:
  52   case ArchKind::XSCALE:
  53   case ArchKind::ARMV5TEJ:
  54     return 5;
  55   case ArchKind::ARMV6:
  56   case ArchKind::ARMV6K:
  57   case ArchKind::ARMV6T2:
  58   case ArchKind::ARMV6KZ:
  59   case ArchKind::ARMV6M:
  60     return 6;
  61   case ArchKind::ARMV7A:
  62   case ArchKind::ARMV7VE:
  63   case ArchKind::ARMV7R:
  64   case ArchKind::ARMV7M:
  65   case ArchKind::ARMV7S:
  66   case ArchKind::ARMV7EM:
  67   case ArchKind::ARMV7K:
  68     return 7;
  69   case ArchKind::ARMV8A:
  70   case ArchKind::ARMV8_1A:
  71   case ArchKind::ARMV8_2A:
  72   case ArchKind::ARMV8_3A:
  73   case ArchKind::ARMV8_4A:
  74   case ArchKind::ARMV8_5A:
  75   case ArchKind::ARMV8_6A:
  76   case ArchKind::ARMV8_7A:
  77   case ArchKind::ARMV8_8A:
  78   case ArchKind::ARMV8_9A:
  79   case ArchKind::ARMV8R:
  80   case ArchKind::ARMV8MBaseline:
  81   case ArchKind::ARMV8MMainline:
  82   case ArchKind::ARMV8_1MMainline:
  83     return 8;
  84   case ArchKind::ARMV9A:
  85   case ArchKind::ARMV9_1A:
  86   case ArchKind::ARMV9_2A:
  87   case ArchKind::ARMV9_3A:
  88   case ArchKind::ARMV9_4A:
  89   case ArchKind::ARMV9_5A:
  90   case ArchKind::ARMV9_6A:
  91     return 9;
  92   case ArchKind::INVALID:
  93     return 0;
  94   }
  95   llvm_unreachable("Unhandled architecture");
  96 }
  97
  98 static ARM::ProfileKind getProfileKind(ARM::ArchKind AK) {
  99   switch (AK) {
 100   case ARM::ArchKind::ARMV6M:
 101   case ARM::ArchKind::ARMV7M:
 102   case ARM::ArchKind::ARMV7EM:
 103   case ARM::ArchKind::ARMV8MMainline:
 104   case ARM::ArchKind::ARMV8MBaseline:
 105   case ARM::ArchKind::ARMV8_1MMainline:
 106     return ARM::ProfileKind::M;
 107   case ARM::ArchKind::ARMV7R:
 108   case ARM::ArchKind::ARMV8R:
 109     return ARM::ProfileKind::R;
 110   case ARM::ArchKind::ARMV7A:
 111   case ARM::ArchKind::ARMV7VE:
 112   case ARM::ArchKind::ARMV7K:
 113   case ARM::ArchKind::ARMV8A:
 114   case ARM::ArchKind::ARMV8_1A:
 115   case ARM::ArchKind::ARMV8_2A:
 116   case ARM::ArchKind::ARMV8_3A:
 117   case ARM::ArchKind::ARMV8_4A:
 118   case ARM::ArchKind::ARMV8_5A:
 119   case ARM::ArchKind::ARMV8_6A:
 120   case ARM::ArchKind::ARMV8_7A:
 121   case ARM::ArchKind::ARMV8_8A:
 122   case ARM::ArchKind::ARMV8_9A:
 123   case ARM::ArchKind::ARMV9A:
 124   case ARM::ArchKind::ARMV9_1A:
 125   case ARM::ArchKind::ARMV9_2A:
 126   case ARM::ArchKind::ARMV9_3A:
 127   case ARM::ArchKind::ARMV9_4A:
 128   case ARM::ArchKind::ARMV9_5A:
 129   case ARM::ArchKind::ARMV9_6A:
 130     return ARM::ProfileKind::A;
 131   case ARM::ArchKind::ARMV4:
 132   case ARM::ArchKind::ARMV4T:
 133   case ARM::ArchKind::ARMV5T:
 134   case ARM::ArchKind::ARMV5TE:
 135   case ARM::ArchKind::ARMV5TEJ:
 136   case ARM::ArchKind::ARMV6:
 137   case ARM::ArchKind::ARMV6K:
 138   case ARM::ArchKind::ARMV6T2:
 139   case ARM::ArchKind::ARMV6KZ:
 140   case ARM::ArchKind::ARMV7S:
 141   case ARM::ArchKind::IWMMXT:
 142   case ARM::ArchKind::IWMMXT2:
 143   case ARM::ArchKind::XSCALE:
 144   case ARM::ArchKind::INVALID:
 145     return ARM::ProfileKind::INVALID;
 146   }
 147   llvm_unreachable("Unhandled architecture");
 148 }
 149
 150 // Profile A/R/M
 151 ARM::ProfileKind ARM::parseArchProfile(StringRef Arch) {
 152   Arch = getCanonicalArchName(Arch);
 153   return getProfileKind(parseArch(Arch));
 154 }
 155
 156 bool ARM::getFPUFeatures(ARM::FPUKind FPUKind,
 157                          std::vector<StringRef> &Features) {
 158
 159   if (FPUKind >= FK_LAST || FPUKind == FK_INVALID)
 160     return false;
 161
 162   static const struct FPUFeatureNameInfo {
 163     const char *PlusName, *MinusName;
 164     FPUVersion MinVersion;
 165     FPURestriction MaxRestriction;
 166   } FPUFeatureInfoList[] = {
 167     // We have to specify the + and - versions of the name in full so
 168     // that we can return them as static StringRefs.
 169     //
 170     // Also, the SubtargetFeatures ending in just "sp" are listed here
 171     // under FPURestriction::None, which is the only FPURestriction in
 172     // which they would be valid (since FPURestriction::SP doesn't
 173     // exist).
 174     {"+vfp2", "-vfp2", FPUVersion::VFPV2, FPURestriction::D16},
 175     {"+vfp2sp", "-vfp2sp", FPUVersion::VFPV2, FPURestriction::SP_D16},
 176     {"+vfp3", "-vfp3", FPUVersion::VFPV3, FPURestriction::None},
 177     {"+vfp3d16", "-vfp3d16", FPUVersion::VFPV3, FPURestriction::D16},
 178     {"+vfp3d16sp", "-vfp3d16sp", FPUVersion::VFPV3, FPURestriction::SP_D16},
 179     {"+vfp3sp", "-vfp3sp", FPUVersion::VFPV3, FPURestriction::None},
 180     {"+fp16", "-fp16", FPUVersion::VFPV3_FP16, FPURestriction::SP_D16},
 181     {"+vfp4", "-vfp4", FPUVersion::VFPV4, FPURestriction::None},
 182     {"+vfp4d16", "-vfp4d16", FPUVersion::VFPV4, FPURestriction::D16},
 183     {"+vfp4d16sp", "-vfp4d16sp", FPUVersion::VFPV4, FPURestriction::SP_D16},
 184     {"+vfp4sp", "-vfp4sp", FPUVersion::VFPV4, FPURestriction::None},
 185     {"+fp-armv8", "-fp-armv8", FPUVersion::VFPV5, FPURestriction::None},
 186     {"+fp-armv8d16", "-fp-armv8d16", FPUVersion::VFPV5, FPURestriction::D16},
 187     {"+fp-armv8d16sp", "-fp-armv8d16sp", FPUVersion::VFPV5, FPURestriction::SP_D16},
 188     {"+fp-armv8sp", "-fp-armv8sp", FPUVersion::VFPV5, FPURestriction::None},
 189     {"+fullfp16", "-fullfp16", FPUVersion::VFPV5_FULLFP16, FPURestriction::SP_D16},
 190     {"+fp64", "-fp64", FPUVersion::VFPV2, FPURestriction::D16},
 191     {"+d32", "-d32", FPUVersion::VFPV3, FPURestriction::None},
 192   };
 193
 194   for (const auto &Info: FPUFeatureInfoList) {
 195     if (FPUNames[FPUKind].FPUVer >= Info.MinVersion &&
 196         FPUNames[FPUKind].Restriction <= Info.MaxRestriction)
 197       Features.push_back(Info.PlusName);
 198     else
 199       Features.push_back(Info.MinusName);
 200   }
 201
 202   static const struct NeonFeatureNameInfo {
 203     const char *PlusName, *MinusName;
 204     NeonSupportLevel MinSupportLevel;
 205   } NeonFeatureInfoList[] = {
 206       {"+neon", "-neon", NeonSupportLevel::Neon},
 207       {"+sha2", "-sha2", NeonSupportLevel::Crypto},
 208       {"+aes", "-aes", NeonSupportLevel::Crypto},
 209   };
 210
 211   for (const auto &Info: NeonFeatureInfoList) {
 212     if (FPUNames[FPUKind].NeonSupport >= Info.MinSupportLevel)
 213       Features.push_back(Info.PlusName);
 214     else
 215       Features.push_back(Info.MinusName);
 216   }
 217
 218   return true;
 219 }
 220
 221 ARM::FPUKind ARM::parseFPU(StringRef FPU) {
 222   StringRef Syn = getFPUSynonym(FPU);
 223   for (const auto &F : FPUNames) {
 224     if (Syn == F.Name)
 225       return F.ID;
 226   }
 227   return FK_INVALID;
 228 }
 229
 230 ARM::NeonSupportLevel ARM::getFPUNeonSupportLevel(ARM::FPUKind FPUKind) {
 231   if (FPUKind >= FK_LAST)
 232     return NeonSupportLevel::None;
 233   return FPUNames[FPUKind].NeonSupport;
 234 }
 235
 236 StringRef ARM::getFPUSynonym(StringRef FPU) {
 237   return StringSwitch<StringRef>(FPU)
 238       .Cases("fpa", "fpe2", "fpe3", "maverick", "invalid") // Unsupported
 239       .Case("vfp2", "vfpv2")
 240       .Case("vfp3", "vfpv3")
 241       .Case("vfp4", "vfpv4")
 242       .Case("vfp3-d16", "vfpv3-d16")
 243       .Case("vfp4-d16", "vfpv4-d16")
 244       .Cases("fp4-sp-d16", "vfpv4-sp-d16", "fpv4-sp-d16")
 245       .Cases("fp4-dp-d16", "fpv4-dp-d16", "vfpv4-d16")
 246       .Case("fp5-sp-d16", "fpv5-sp-d16")
 247       .Cases("fp5-dp-d16", "fpv5-dp-d16", "fpv5-d16")
 248       // FIXME: Clang uses it, but it's bogus, since neon defaults to vfpv3.
 249       .Case("neon-vfpv3", "neon")
 250       .Default(FPU);
 251 }
 252
 253 StringRef ARM::getFPUName(ARM::FPUKind FPUKind) {
 254   if (FPUKind >= FK_LAST)
 255     return StringRef();
 256   return FPUNames[FPUKind].Name;
 257 }
 258
 259 ARM::FPUVersion ARM::getFPUVersion(ARM::FPUKind FPUKind) {
 260   if (FPUKind >= FK_LAST)
 261     return FPUVersion::NONE;
 262   return FPUNames[FPUKind].FPUVer;
 263 }
 264
 265 ARM::FPURestriction ARM::getFPURestriction(ARM::FPUKind FPUKind) {
 266   if (FPUKind >= FK_LAST)
 267     return FPURestriction::None;
 268   return FPUNames[FPUKind].Restriction;
 269 }
 270
 271 ARM::FPUKind ARM::getDefaultFPU(StringRef CPU, ARM::ArchKind AK) {
 272   if (CPU == "generic")
 273     return ARM::ARMArchNames[static_cast<unsigned>(AK)].DefaultFPU;
 274
 275   return StringSwitch<ARM::FPUKind>(CPU)
 276 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
 277   .Case(NAME, DEFAULT_FPU)
 278 #include "llvm/TargetParser/ARMTargetParser.def"
 279       .Default(ARM::FK_INVALID);
 280 }
 281
 282 uint64_t ARM::getDefaultExtensions(StringRef CPU, ARM::ArchKind AK) {
 283   if (CPU == "generic")
 284     return ARM::ARMArchNames[static_cast<unsigned>(AK)].ArchBaseExtensions;
 285
 286   return StringSwitch<uint64_t>(CPU)
 287 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
 288   .Case(NAME,                                                                  \
 289         ARMArchNames[static_cast<unsigned>(ArchKind::ID)].ArchBaseExtensions | \
 290             DEFAULT_EXT)
 291 #include "llvm/TargetParser/ARMTargetParser.def"
 292   .Default(ARM::AEK_INVALID);
 293 }
 294
 295 bool ARM::getHWDivFeatures(uint64_t HWDivKind,
 296                            std::vector<StringRef> &Features) {
 297
 298   if (HWDivKind == AEK_INVALID)
 299     return false;
 300
 301   if (HWDivKind & AEK_HWDIVARM)
 302     Features.push_back("+hwdiv-arm");
 303   else
 304     Features.push_back("-hwdiv-arm");
 305
 306   if (HWDivKind & AEK_HWDIVTHUMB)
 307     Features.push_back("+hwdiv");
 308   else
 309     Features.push_back("-hwdiv");
 310
 311   return true;
 312 }
 313
 314 bool ARM::getExtensionFeatures(uint64_t Extensions,
 315                                std::vector<StringRef> &Features) {
 316
 317   if (Extensions == AEK_INVALID)
 318     return false;
 319
 320   for (const auto &AE : ARCHExtNames) {
 321     if ((Extensions & AE.ID) == AE.ID && !AE.Feature.empty())
 322       Features.push_back(AE.Feature);
 323     else if (!AE.NegFeature.empty())
 324       Features.push_back(AE.NegFeature);
 325   }
 326
 327   return getHWDivFeatures(Extensions, Features);
 328 }
 329
 330 StringRef ARM::getArchName(ARM::ArchKind AK) {
 331   return ARMArchNames[static_cast<unsigned>(AK)].Name;
 332 }
 333
 334 StringRef ARM::getCPUAttr(ARM::ArchKind AK) {
 335   return ARMArchNames[static_cast<unsigned>(AK)].CPUAttr;
 336 }
 337
 338 StringRef ARM::getSubArch(ARM::ArchKind AK) {
 339   return ARMArchNames[static_cast<unsigned>(AK)].getSubArch();
 340 }
 341
 342 unsigned ARM::getArchAttr(ARM::ArchKind AK) {
 343   return ARMArchNames[static_cast<unsigned>(AK)].ArchAttr;
 344 }
 345
 346 StringRef ARM::getArchExtName(uint64_t ArchExtKind) {
 347   for (const auto &AE : ARCHExtNames) {
 348     if (ArchExtKind == AE.ID)
 349       return AE.Name;
 350   }
 351   return StringRef();
 352 }
 353
 354 static bool stripNegationPrefix(StringRef &Name) {
 355   return Name.consume_front("no");
 356 }
 357
 358 StringRef ARM::getArchExtFeature(StringRef ArchExt) {
 359   bool Negated = stripNegationPrefix(ArchExt);
 360   for (const auto &AE : ARCHExtNames) {
 361     if (!AE.Feature.empty() && ArchExt == AE.Name)
 362       return StringRef(Negated ? AE.NegFeature : AE.Feature);
 363   }
 364
 365   return StringRef();
 366 }
 367
 368 static ARM::FPUKind findDoublePrecisionFPU(ARM::FPUKind InputFPUKind) {
 369   if (InputFPUKind == ARM::FK_INVALID || InputFPUKind == ARM::FK_NONE)
 370     return ARM::FK_INVALID;
 371
 372   const ARM::FPUName &InputFPU = ARM::FPUNames[InputFPUKind];
 373
 374   // If the input FPU already supports double-precision, then there
 375   // isn't any different FPU we can return here.
 376   if (ARM::isDoublePrecision(InputFPU.Restriction))
 377     return InputFPUKind;
 378
 379   // Otherwise, look for an FPU entry with all the same fields, except
 380   // that it supports double precision.
 381   for (const ARM::FPUName &CandidateFPU : ARM::FPUNames) {
 382     if (CandidateFPU.FPUVer == InputFPU.FPUVer &&
 383         CandidateFPU.NeonSupport == InputFPU.NeonSupport &&
 384         ARM::has32Regs(CandidateFPU.Restriction) ==
 385             ARM::has32Regs(InputFPU.Restriction) &&
 386         ARM::isDoublePrecision(CandidateFPU.Restriction)) {
 387       return CandidateFPU.ID;
 388     }
 389   }
 390
 391   // nothing found
 392   return ARM::FK_INVALID;
 393 }
 394
 395 static ARM::FPUKind findSinglePrecisionFPU(ARM::FPUKind InputFPUKind) {
 396   if (InputFPUKind == ARM::FK_INVALID || InputFPUKind == ARM::FK_NONE)
 397     return ARM::FK_INVALID;
 398
 399   const ARM::FPUName &InputFPU = ARM::FPUNames[InputFPUKind];
 400
 401   // If the input FPU already is single-precision only, then there
 402   // isn't any different FPU we can return here.
 403   if (!ARM::isDoublePrecision(InputFPU.Restriction))
 404     return InputFPUKind;
 405
 406   // Otherwise, look for an FPU entry with all the same fields, except
 407   // that it does not support double precision.
 408   for (const ARM::FPUName &CandidateFPU : ARM::FPUNames) {
 409     if (CandidateFPU.FPUVer == InputFPU.FPUVer &&
 410         CandidateFPU.NeonSupport == InputFPU.NeonSupport &&
 411         ARM::has32Regs(CandidateFPU.Restriction) ==
 412             ARM::has32Regs(InputFPU.Restriction) &&
 413         !ARM::isDoublePrecision(CandidateFPU.Restriction)) {
 414       return CandidateFPU.ID;
 415     }
 416   }
 417
 418   // nothing found
 419   return ARM::FK_INVALID;
 420 }
 421
 422 bool ARM::appendArchExtFeatures(StringRef CPU, ARM::ArchKind AK,
 423                                 StringRef ArchExt,
 424                                 std::vector<StringRef> &Features,
 425                                 ARM::FPUKind &ArgFPUKind) {
 426
 427   size_t StartingNumFeatures = Features.size();
 428   const bool Negated = stripNegationPrefix(ArchExt);
 429   uint64_t ID = parseArchExt(ArchExt);
 430
 431   if (ID == AEK_INVALID)
 432     return false;
 433
 434   for (const auto &AE : ARCHExtNames) {
 435     if (Negated) {
 436       if ((AE.ID & ID) == ID && !AE.NegFeature.empty())
 437         Features.push_back(AE.NegFeature);
 438     } else {
 439       if ((AE.ID & ID) == AE.ID && !AE.Feature.empty())
 440         Features.push_back(AE.Feature);
 441     }
 442   }
 443
 444   if (CPU == "")
 445     CPU = "generic";
 446
 447   if (ArchExt == "fp" || ArchExt == "fp.dp") {
 448     const ARM::FPUKind DefaultFPU = getDefaultFPU(CPU, AK);
 449     ARM::FPUKind FPUKind;
 450     if (ArchExt == "fp.dp") {
 451       const bool IsDP = ArgFPUKind != ARM::FK_INVALID &&
 452                         ArgFPUKind != ARM::FK_NONE &&
 453                         isDoublePrecision(getFPURestriction(ArgFPUKind));
 454       if (Negated) {
 455         /* If there is no FPU selected yet, we still need to set ArgFPUKind, as
 456          * leaving it as FK_INVALID, would cause default FPU to be selected
 457          * later and that could be double precision one. */
 458         if (ArgFPUKind != ARM::FK_INVALID && !IsDP)
 459           return true;
 460         FPUKind = findSinglePrecisionFPU(DefaultFPU);
 461         if (FPUKind == ARM::FK_INVALID)
 462           FPUKind = ARM::FK_NONE;
 463       } else {
 464         if (IsDP)
 465           return true;
 466         FPUKind = findDoublePrecisionFPU(DefaultFPU);
 467         if (FPUKind == ARM::FK_INVALID)
 468           return false;
 469       }
 470     } else if (Negated) {
 471       FPUKind = ARM::FK_NONE;
 472     } else {
 473       FPUKind = DefaultFPU;
 474     }
 475     ArgFPUKind = FPUKind;
 476     return true;
 477   }
 478   return StartingNumFeatures != Features.size();
 479 }
 480
 481 ARM::ArchKind ARM::convertV9toV8(ARM::ArchKind AK) {
 482   if (getProfileKind(AK) != ProfileKind::A)
 483     return ARM::ArchKind::INVALID;
 484   if (AK < ARM::ArchKind::ARMV9A || AK > ARM::ArchKind::ARMV9_3A)
 485     return ARM::ArchKind::INVALID;
 486   unsigned AK_v8 = static_cast<unsigned>(ARM::ArchKind::ARMV8_5A);
 487   AK_v8 += static_cast<unsigned>(AK) -
 488            static_cast<unsigned>(ARM::ArchKind::ARMV9A);
 489   return static_cast<ARM::ArchKind>(AK_v8);
 490 }
 491
 492 StringRef ARM::getDefaultCPU(StringRef Arch) {
 493   ArchKind AK = parseArch(Arch);
 494   if (AK == ArchKind::INVALID)
 495     return StringRef();
 496
 497   // Look for multiple AKs to find the default for pair AK+Name.
 498   for (const auto &CPU : CPUNames) {
 499     if (CPU.ArchID == AK && CPU.Default)
 500       return CPU.Name;
 501   }
 502
 503   // If we can't find a default then target the architecture instead
 504   return "generic";
 505 }
 506
 507 uint64_t ARM::parseHWDiv(StringRef HWDiv) {
 508   StringRef Syn = getHWDivSynonym(HWDiv);
 509   for (const auto &D : HWDivNames) {
 510     if (Syn == D.Name)
 511       return D.ID;
 512   }
 513   return AEK_INVALID;
 514 }
 515
 516 uint64_t ARM::parseArchExt(StringRef ArchExt) {
 517   for (const auto &A : ARCHExtNames) {
 518     if (ArchExt == A.Name)
 519       return A.ID;
 520   }
 521   return AEK_INVALID;
 522 }
 523
 524 ARM::ArchKind ARM::parseCPUArch(StringRef CPU) {
 525   for (const auto &C : CPUNames) {
 526     if (CPU == C.Name)
 527       return C.ArchID;
 528   }
 529   return ArchKind::INVALID;
 530 }
 531
 532 void ARM::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values) {
 533   for (const auto &Arch : CPUNames) {
 534     if (Arch.ArchID != ArchKind::INVALID)
 535       Values.push_back(Arch.Name);
 536   }
 537 }
 538
 539 StringRef ARM::computeDefaultTargetABI(const Triple &TT, StringRef CPU) {
 540   StringRef ArchName =
 541       CPU.empty() ? TT.getArchName() : getArchName(parseCPUArch(CPU));
 542
 543   if (TT.isOSBinFormatMachO()) {
 544     if (TT.getEnvironment() == Triple::EABI ||
 545         TT.getOS() == Triple::UnknownOS ||
 546         parseArchProfile(ArchName) == ProfileKind::M)
 547       return "aapcs";
 548     if (TT.isWatchABI())
 549       return "aapcs16";
 550     return "apcs-gnu";
 551   } else if (TT.isOSWindows())
 552     // FIXME: this is invalid for WindowsCE.
 553     return "aapcs";
 554
 555   // Select the default based on the platform.
 556   switch (TT.getEnvironment()) {
 557   case Triple::Android:
 558   case Triple::GNUEABI:
 559   case Triple::GNUEABIT64:
 560   case Triple::GNUEABIHF:
 561   case Triple::GNUEABIHFT64:
 562   case Triple::MuslEABI:
 563   case Triple::MuslEABIHF:
 564   case Triple::OpenHOS:
 565     return "aapcs-linux";
 566   case Triple::EABIHF:
 567   case Triple::EABI:
 568     return "aapcs";
 569   default:
 570     if (TT.isOSNetBSD())
 571       return "apcs-gnu";
 572     if (TT.isOSFreeBSD() || TT.isOSOpenBSD() || TT.isOSHaiku() ||
 573         TT.isOHOSFamily())
 574       return "aapcs-linux";
 575     return "aapcs";
 576   }
 577 }
 578
 579 StringRef ARM::getARMCPUForArch(const llvm::Triple &Triple, StringRef MArch) {
 580   if (MArch.empty())
 581     MArch = Triple.getArchName();
 582   MArch = llvm::ARM::getCanonicalArchName(MArch);
 583
 584   // Some defaults are forced.
 585   switch (Triple.getOS()) {
 586   case llvm::Triple::FreeBSD:
 587   case llvm::Triple::NetBSD:
 588   case llvm::Triple::OpenBSD:
 589   case llvm::Triple::Haiku:
 590     if (!MArch.empty() && MArch == "v6")
 591       return "arm1176jzf-s";
 592     if (!MArch.empty() && MArch == "v7")
 593       return "cortex-a8";
 594     break;
 595   case llvm::Triple::Win32:
 596     // FIXME: this is invalid for WindowsCE
 597     if (llvm::ARM::parseArchVersion(MArch) <= 7)
 598       return "cortex-a9";
 599     break;
 600   case llvm::Triple::IOS:
 601   case llvm::Triple::MacOSX:
 602   case llvm::Triple::TvOS:
 603   case llvm::Triple::WatchOS:
 604   case llvm::Triple::DriverKit:
 605   case llvm::Triple::XROS:
 606     if (MArch == "v7k")
 607       return "cortex-a7";
 608     break;
 609   default:
 610     break;
 611   }
 612
 613   if (MArch.empty())
 614     return StringRef();
 615
 616   StringRef CPU = llvm::ARM::getDefaultCPU(MArch);
 617   if (!CPU.empty() && CPU != "invalid")
 618     return CPU;
 619
 620   // If no specific architecture version is requested, return the minimum CPU
 621   // required by the OS and environment.
 622   switch (Triple.getOS()) {
 623   case llvm::Triple::Haiku:
 624     return "arm1176jzf-s";
 625   case llvm::Triple::NetBSD:
 626     switch (Triple.getEnvironment()) {
 627     case llvm::Triple::EABI:
 628     case llvm::Triple::EABIHF:
 629     case llvm::Triple::GNUEABI:
 630     case llvm::Triple::GNUEABIHF:
 631       return "arm926ej-s";
 632     default:
 633       return "strongarm";
 634     }
 635   case llvm::Triple::NaCl:
 636   case llvm::Triple::OpenBSD:
 637     return "cortex-a8";
 638   default:
 639     switch (Triple.getEnvironment()) {
 640     case llvm::Triple::EABIHF:
 641     case llvm::Triple::GNUEABIHF:
 642     case llvm::Triple::GNUEABIHFT64:
 643     case llvm::Triple::MuslEABIHF:
 644       return "arm1176jzf-s";
 645     default:
 646       return "arm7tdmi";
 647     }
 648   }
 649
 650   llvm_unreachable("invalid arch name");
 651 }
 652
 653 void ARM::PrintSupportedExtensions(StringMap<StringRef> DescMap) {
 654   outs() << "All available -march extensions for ARM\n\n"
 655          << "    " << left_justify("Name", 20)
 656          << (DescMap.empty() ? "\n" : "Description\n");
 657   for (const auto &Ext : ARCHExtNames) {
 658     // Extensions without a feature cannot be used with -march.
 659     if (!Ext.Feature.empty()) {
 660       std::string Description = DescMap[Ext.Name].str();
 661       outs() << "    "
 662              << format(Description.empty() ? "%s\n" : "%-20s%s\n",
 663                        Ext.Name.str().c_str(), Description.c_str());
 664     }
 665   }
 666 }