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