Fix ARM triple parsing
[oota-llvm.git] / lib / Support / Triple.cpp
index d09931a34564256a9c85dcb4516a8360d65b6a41..4a4773e2f7e7e6866da576e122e0049e3ae04037 100644 (file)
@@ -22,6 +22,7 @@ const char *Triple::getArchTypeName(ArchType Kind) {
   case aarch64:     return "aarch64";
   case aarch64_be:  return "aarch64_be";
   case arm:         return "arm";
+  case armeb:       return "armeb";
   case hexagon:     return "hexagon";
   case mips:        return "mips";
   case mipsel:      return "mipsel";
@@ -37,15 +38,21 @@ const char *Triple::getArchTypeName(ArchType Kind) {
   case systemz:     return "s390x";
   case tce:         return "tce";
   case thumb:       return "thumb";
+  case thumbeb:     return "thumbeb";
   case x86:         return "i386";
   case x86_64:      return "x86_64";
   case xcore:       return "xcore";
   case nvptx:       return "nvptx";
   case nvptx64:     return "nvptx64";
   case le32:        return "le32";
+  case le64:        return "le64";
   case amdil:       return "amdil";
+  case amdil64:     return "amdil64";
+  case hsail:       return "hsail";
+  case hsail64:     return "hsail64";
   case spir:        return "spir";
   case spir64:      return "spir64";
+  case kalimba:     return "kalimba";
   }
 
   llvm_unreachable("Invalid ArchType!");
@@ -54,13 +61,15 @@ const char *Triple::getArchTypeName(ArchType Kind) {
 const char *Triple::getArchTypePrefix(ArchType Kind) {
   switch (Kind) {
   default:
-    return 0;
+    return nullptr;
 
   case aarch64:
   case aarch64_be:  return "aarch64";
 
   case arm:
-  case thumb:       return "arm";
+  case armeb:
+  case thumb:
+  case thumbeb:     return "arm";
 
   case ppc64:
   case ppc64le:
@@ -87,10 +96,19 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
 
   case nvptx:       return "nvptx";
   case nvptx64:     return "nvptx";
+
   case le32:        return "le32";
-  case amdil:       return "amdil";
-  case spir:        return "spir";
+  case le64:        return "le64";
+
+  case amdil:
+  case amdil64:     return "amdil";
+
+  case hsail:
+  case hsail64:     return "hsail";
+
+  case spir:
   case spir64:      return "spir";
+  case kalimba:     return "kalimba";
   }
 }
 
@@ -105,7 +123,10 @@ const char *Triple::getVendorTypeName(VendorType Kind) {
   case BGQ: return "bgq";
   case Freescale: return "fsl";
   case IBM: return "ibm";
+  case ImaginationTechnologies: return "img";
+  case MipsTechnologies: return "mti";
   case NVIDIA: return "nvidia";
+  case CSR: return "csr";
   }
 
   llvm_unreachable("Invalid VendorType!");
@@ -115,8 +136,6 @@ const char *Triple::getOSTypeName(OSType Kind) {
   switch (Kind) {
   case UnknownOS: return "unknown";
 
-  case AuroraUX: return "auroraux";
-  case Cygwin: return "cygwin";
   case Darwin: return "darwin";
   case DragonFly: return "dragonfly";
   case FreeBSD: return "freebsd";
@@ -125,11 +144,10 @@ const char *Triple::getOSTypeName(OSType Kind) {
   case Linux: return "linux";
   case Lv2: return "lv2";
   case MacOSX: return "macosx";
-  case MinGW32: return "mingw32";
   case NetBSD: return "netbsd";
   case OpenBSD: return "openbsd";
   case Solaris: return "solaris";
-  case Win32: return "win32";
+  case Win32: return "windows";
   case Haiku: return "haiku";
   case Minix: return "minix";
   case RTEMS: return "rtems";
@@ -155,6 +173,9 @@ const char *Triple::getEnvironmentTypeName(EnvironmentType Kind) {
   case EABI: return "eabi";
   case EABIHF: return "eabihf";
   case Android: return "android";
+  case MSVC: return "msvc";
+  case Itanium: return "itanium";
+  case Cygnus: return "cygnus";
   }
 
   llvm_unreachable("Invalid EnvironmentType!");
@@ -164,7 +185,9 @@ Triple::ArchType Triple::getArchTypeForLLVMName(StringRef Name) {
   return StringSwitch<Triple::ArchType>(Name)
     .Case("aarch64", aarch64)
     .Case("aarch64_be", aarch64_be)
+    .Case("arm64", aarch64) // "arm64" is an alias for "aarch64"
     .Case("arm", arm)
+    .Case("armeb", armeb)
     .Case("mips", mips)
     .Case("mipsel", mipsel)
     .Case("mips64", mips64)
@@ -181,42 +204,66 @@ Triple::ArchType Triple::getArchTypeForLLVMName(StringRef Name) {
     .Case("systemz", systemz)
     .Case("tce", tce)
     .Case("thumb", thumb)
+    .Case("thumbeb", thumbeb)
     .Case("x86", x86)
     .Case("x86-64", x86_64)
     .Case("xcore", xcore)
     .Case("nvptx", nvptx)
     .Case("nvptx64", nvptx64)
     .Case("le32", le32)
+    .Case("le64", le64)
     .Case("amdil", amdil)
+    .Case("amdil64", amdil64)
+    .Case("hsail", hsail)
+    .Case("hsail64", hsail64)
     .Case("spir", spir)
     .Case("spir64", spir64)
+    .Case("kalimba", kalimba)
     .Default(UnknownArch);
 }
 
-// Returns architecture name that is understood by the target assembler.
-const char *Triple::getArchNameForAssembler() {
-  if (!isOSDarwin() && getVendor() != Triple::Apple)
-    return NULL;
-
-  return StringSwitch<const char*>(getArchName())
-    .Case("i386", "i386")
-    .Case("x86_64", "x86_64")
-    .Case("powerpc", "ppc")
-    .Case("powerpc64", "ppc64")
-    .Case("powerpc64le", "ppc64le")
-    .Case("arm", "arm")
-    .Cases("armv4t", "thumbv4t", "armv4t")
-    .Cases("armv5", "armv5e", "thumbv5", "thumbv5e", "armv5")
-    .Cases("armv6", "thumbv6", "armv6")
-    .Cases("armv7", "thumbv7", "armv7")
-    .Case("r600", "r600")
-    .Case("nvptx", "nvptx")
-    .Case("nvptx64", "nvptx64")
-    .Case("le32", "le32")
-    .Case("amdil", "amdil")
-    .Case("spir", "spir")
-    .Case("spir64", "spir64")
-    .Default(NULL);
+static Triple::ArchType parseARMArch(StringRef ArchName) {
+  size_t offset = StringRef::npos;
+  Triple::ArchType arch = Triple::UnknownArch;
+  bool isThumb = ArchName.startswith("thumb");
+
+  if (ArchName.equals("arm"))
+    return Triple::arm;
+  if (ArchName.equals("armeb"))
+    return Triple::armeb;
+  if (ArchName.equals("thumb"))
+    return Triple::thumb;
+  if (ArchName.equals("thumbeb"))
+    return Triple::thumbeb;
+  if (ArchName.equals("arm64") || ArchName.equals("aarch64"))
+    return Triple::aarch64;
+  if (ArchName.equals("aarch64_be"))
+    return Triple::aarch64_be;
+
+  if (ArchName.startswith("armv")) {
+    offset = 3;
+    arch = Triple::arm;
+  } else if (ArchName.startswith("armebv")) {
+    offset = 5;
+    arch = Triple::armeb;
+  } else if (ArchName.startswith("thumbv")) {
+    offset = 5;
+    arch = Triple::thumb;
+  } else if (ArchName.startswith("thumbebv")) {
+    offset = 7;
+    arch = Triple::thumbeb;
+  }
+  return StringSwitch<Triple::ArchType>(ArchName.substr(offset))
+    .Cases("v2", "v2a", isThumb ? Triple::UnknownArch : arch)
+    .Cases("v3", "v3m", isThumb ? Triple::UnknownArch : arch)
+    .Cases("v4", "v4t", arch)
+    .Cases("v5", "v5e", "v5t", "v5te", "v5tej", arch)
+    .Cases("v6", "v6j", "v6k", "v6m", arch)
+    .Cases("v6t2", "v6z", "v6zk", arch)
+    .Cases("v7", "v7a", "v7em", "v7l", arch)
+    .Cases("v7m", "v7r", "v7s", arch)
+    .Cases("v8", "v8a", arch)
+    .Default(Triple::UnknownArch);
 }
 
 static Triple::ArchType parseArch(StringRef ArchName) {
@@ -228,14 +275,10 @@ static Triple::ArchType parseArch(StringRef ArchName) {
     .Case("powerpc", Triple::ppc)
     .Cases("powerpc64", "ppu", Triple::ppc64)
     .Case("powerpc64le", Triple::ppc64le)
-    .Case("aarch64", Triple::aarch64)
-    .Case("aarch64_be", Triple::aarch64_be)
-    .Cases("arm", "xscale", Triple::arm)
-    // FIXME: It would be good to replace these with explicit names for all the
-    // various suffixes supported.
-    .StartsWith("armv", Triple::arm)
-    .Case("thumb", Triple::thumb)
-    .StartsWith("thumbv", Triple::thumb)
+    .Case("xscale", Triple::arm)
+    .StartsWith("arm", parseARMArch(ArchName))
+    .StartsWith("thumb", parseARMArch(ArchName))
+    .StartsWith("aarch64", parseARMArch(ArchName))
     .Case("msp430", Triple::msp430)
     .Cases("mips", "mipseb", "mipsallegrex", Triple::mips)
     .Cases("mipsel", "mipsallegrexel", Triple::mipsel)
@@ -251,9 +294,14 @@ static Triple::ArchType parseArch(StringRef ArchName) {
     .Case("nvptx", Triple::nvptx)
     .Case("nvptx64", Triple::nvptx64)
     .Case("le32", Triple::le32)
+    .Case("le64", Triple::le64)
     .Case("amdil", Triple::amdil)
+    .Case("amdil64", Triple::amdil64)
+    .Case("hsail", Triple::hsail)
+    .Case("hsail64", Triple::hsail64)
     .Case("spir", Triple::spir)
     .Case("spir64", Triple::spir64)
+    .StartsWith("kalimba", Triple::kalimba)
     .Default(Triple::UnknownArch);
 }
 
@@ -266,14 +314,15 @@ static Triple::VendorType parseVendor(StringRef VendorName) {
     .Case("bgq", Triple::BGQ)
     .Case("fsl", Triple::Freescale)
     .Case("ibm", Triple::IBM)
+    .Case("img", Triple::ImaginationTechnologies)
+    .Case("mti", Triple::MipsTechnologies)
     .Case("nvidia", Triple::NVIDIA)
+    .Case("csr", Triple::CSR)
     .Default(Triple::UnknownVendor);
 }
 
 static Triple::OSType parseOS(StringRef OSName) {
   return StringSwitch<Triple::OSType>(OSName)
-    .StartsWith("auroraux", Triple::AuroraUX)
-    .StartsWith("cygwin", Triple::Cygwin)
     .StartsWith("darwin", Triple::Darwin)
     .StartsWith("dragonfly", Triple::DragonFly)
     .StartsWith("freebsd", Triple::FreeBSD)
@@ -282,11 +331,11 @@ static Triple::OSType parseOS(StringRef OSName) {
     .StartsWith("linux", Triple::Linux)
     .StartsWith("lv2", Triple::Lv2)
     .StartsWith("macosx", Triple::MacOSX)
-    .StartsWith("mingw32", Triple::MinGW32)
     .StartsWith("netbsd", Triple::NetBSD)
     .StartsWith("openbsd", Triple::OpenBSD)
     .StartsWith("solaris", Triple::Solaris)
     .StartsWith("win32", Triple::Win32)
+    .StartsWith("windows", Triple::Win32)
     .StartsWith("haiku", Triple::Haiku)
     .StartsWith("minix", Triple::Minix)
     .StartsWith("rtems", Triple::RTEMS)
@@ -309,6 +358,9 @@ static Triple::EnvironmentType parseEnvironment(StringRef EnvironmentName) {
     .StartsWith("code16", Triple::CODE16)
     .StartsWith("gnu", Triple::GNU)
     .StartsWith("android", Triple::Android)
+    .StartsWith("msvc", Triple::MSVC)
+    .StartsWith("itanium", Triple::Itanium)
+    .StartsWith("cygnus", Triple::Cygnus)
     .Default(Triple::UnknownEnvironment);
 }
 
@@ -320,6 +372,31 @@ static Triple::ObjectFormatType parseFormat(StringRef EnvironmentName) {
     .Default(Triple::UnknownObjectFormat);
 }
 
+static Triple::SubArchType parseSubArch(StringRef SubArchName) {
+  return StringSwitch<Triple::SubArchType>(SubArchName)
+    .EndsWith("v8", Triple::ARMSubArch_v8)
+    .EndsWith("v8a", Triple::ARMSubArch_v8)
+    .EndsWith("v7", Triple::ARMSubArch_v7)
+    .EndsWith("v7a", Triple::ARMSubArch_v7)
+    .EndsWith("v7em", Triple::ARMSubArch_v7em)
+    .EndsWith("v7l", Triple::ARMSubArch_v7)
+    .EndsWith("v7m", Triple::ARMSubArch_v7m)
+    .EndsWith("v7r", Triple::ARMSubArch_v7)
+    .EndsWith("v7s", Triple::ARMSubArch_v7s)
+    .EndsWith("v6", Triple::ARMSubArch_v6)
+    .EndsWith("v6m", Triple::ARMSubArch_v6m)
+    .EndsWith("v6t2", Triple::ARMSubArch_v6t2)
+    .EndsWith("v5", Triple::ARMSubArch_v5)
+    .EndsWith("v5e", Triple::ARMSubArch_v5)
+    .EndsWith("v5t", Triple::ARMSubArch_v5)
+    .EndsWith("v5te", Triple::ARMSubArch_v5te)
+    .EndsWith("v4t", Triple::ARMSubArch_v4t)
+    .EndsWith("kalimba3", Triple::KalimbaSubArch_v3)
+    .EndsWith("kalimba4", Triple::KalimbaSubArch_v4)
+    .EndsWith("kalimba5", Triple::KalimbaSubArch_v5)
+    .Default(Triple::NoSubArch);
+}
+
 static const char *getObjectFormatTypeName(Triple::ObjectFormatType Kind) {
   switch (Kind) {
   case Triple::UnknownObjectFormat: return "";
@@ -345,6 +422,7 @@ static Triple::ObjectFormatType getDefaultFormat(const Triple &T) {
 Triple::Triple(const Twine &Str)
     : Data(Str.str()),
       Arch(parseArch(getArchName())),
+      SubArch(parseSubArch(getArchName())),
       Vendor(parseVendor(getVendorName())),
       OS(parseOS(getOSName())),
       Environment(parseEnvironment(getEnvironmentName())),
@@ -362,6 +440,7 @@ Triple::Triple(const Twine &Str)
 Triple::Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr)
     : Data((ArchStr + Twine('-') + VendorStr + Twine('-') + OSStr).str()),
       Arch(parseArch(ArchStr.str())),
+      SubArch(parseSubArch(ArchStr.str())),
       Vendor(parseVendor(VendorStr.str())),
       OS(parseOS(OSStr.str())),
       Environment(), ObjectFormat(Triple::UnknownObjectFormat) {
@@ -378,6 +457,7 @@ Triple::Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr,
     : Data((ArchStr + Twine('-') + VendorStr + Twine('-') + OSStr + Twine('-') +
             EnvironmentStr).str()),
       Arch(parseArch(ArchStr.str())),
+      SubArch(parseSubArch(ArchStr.str())),
       Vendor(parseVendor(VendorStr.str())),
       OS(parseOS(OSStr.str())),
       Environment(parseEnvironment(EnvironmentStr.str())),
@@ -387,6 +467,9 @@ Triple::Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr,
 }
 
 std::string Triple::normalize(StringRef Str) {
+  bool IsMinGW32 = false;
+  bool IsCygwin = false;
+
   // Parse into components.
   SmallVector<StringRef, 4> Components;
   Str.split(Components, "-");
@@ -403,12 +486,17 @@ std::string Triple::normalize(StringRef Str) {
   if (Components.size() > 1)
     Vendor = parseVendor(Components[1]);
   OSType OS = UnknownOS;
-  if (Components.size() > 2)
+  if (Components.size() > 2) {
     OS = parseOS(Components[2]);
+    IsCygwin = Components[2].startswith("cygwin");
+    IsMinGW32 = Components[2].startswith("mingw");
+  }
   EnvironmentType Environment = UnknownEnvironment;
   if (Components.size() > 3)
     Environment = parseEnvironment(Components[3]);
   ObjectFormatType ObjectFormat = UnknownObjectFormat;
+  if (Components.size() > 4)
+    ObjectFormat = parseFormat(Components[4]);
 
   // Note which components are already in their final position.  These will not
   // be moved.
@@ -445,7 +533,9 @@ std::string Triple::normalize(StringRef Str) {
         break;
       case 2:
         OS = parseOS(Comp);
-        Valid = OS != UnknownOS;
+        IsCygwin = Comp.startswith("cygwin");
+        IsMinGW32 = Comp.startswith("mingw");
+        Valid = OS != UnknownOS || IsCygwin || IsMinGW32;
         break;
       case 3:
         Environment = parseEnvironment(Comp);
@@ -516,6 +606,32 @@ std::string Triple::normalize(StringRef Str) {
   // Special case logic goes here.  At this point Arch, Vendor and OS have the
   // correct values for the computed components.
 
+  if (OS == Triple::Win32) {
+    Components.resize(4);
+    Components[2] = "windows";
+    if (Environment == UnknownEnvironment) {
+      if (ObjectFormat == UnknownObjectFormat || ObjectFormat == Triple::COFF)
+        Components[3] = "msvc";
+      else
+        Components[3] = getObjectFormatTypeName(ObjectFormat);
+    }
+  } else if (IsMinGW32) {
+    Components.resize(4);
+    Components[2] = "windows";
+    Components[3] = "gnu";
+  } else if (IsCygwin) {
+    Components.resize(4);
+    Components[2] = "windows";
+    Components[3] = "cygnus";
+  }
+  if (IsMinGW32 || IsCygwin ||
+      (OS == Triple::Win32 && Environment != UnknownEnvironment)) {
+    if (ObjectFormat != UnknownObjectFormat && ObjectFormat != Triple::COFF) {
+      Components.resize(5);
+      Components[4] = getObjectFormatTypeName(ObjectFormat);
+    }
+  }
+
   // Stick the corrected components back together to form the normalized string.
   std::string Normalized;
   for (unsigned i = 0, e = Components.size(); i != e; ++i) {
@@ -648,9 +764,9 @@ void Triple::getiOSVersion(unsigned &Major, unsigned &Minor,
     break;
   case IOS:
     getOSVersion(Major, Minor, Micro);
-    // Default to 5.0.
+    // Default to 5.0 (or 7.0 for arm64).
     if (Major == 0)
-      Major = 5;
+      Major = (getArch() == aarch64) ? 7 : 5;
     break;
   }
 }
@@ -676,7 +792,11 @@ void Triple::setEnvironment(EnvironmentType Kind) {
 }
 
 void Triple::setObjectFormat(ObjectFormatType Kind) {
-  setEnvironmentName(getObjectFormatTypeName(Kind));
+  if (Environment == UnknownEnvironment)
+    return setEnvironmentName(getObjectFormatTypeName(Kind));
+
+  setEnvironmentName((getEnvironmentTypeName(Environment) + Twine("-") +
+                      getObjectFormatTypeName(Kind)).str());
 }
 
 void Triple::setArchName(StringRef Str) {
@@ -719,8 +839,8 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::msp430:
     return 16;
 
-  case llvm::Triple::amdil:
   case llvm::Triple::arm:
+  case llvm::Triple::armeb:
   case llvm::Triple::hexagon:
   case llvm::Triple::le32:
   case llvm::Triple::mips:
@@ -731,13 +851,18 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::sparc:
   case llvm::Triple::tce:
   case llvm::Triple::thumb:
+  case llvm::Triple::thumbeb:
   case llvm::Triple::x86:
   case llvm::Triple::xcore:
+  case llvm::Triple::amdil:
+  case llvm::Triple::hsail:
   case llvm::Triple::spir:
+  case llvm::Triple::kalimba:
     return 32;
 
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be:
+  case llvm::Triple::le64:
   case llvm::Triple::mips64:
   case llvm::Triple::mips64el:
   case llvm::Triple::nvptx64:
@@ -746,6 +871,8 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::sparcv9:
   case llvm::Triple::systemz:
   case llvm::Triple::x86_64:
+  case llvm::Triple::amdil64:
+  case llvm::Triple::hsail64:
   case llvm::Triple::spir64:
     return 64;
   }
@@ -777,9 +904,12 @@ Triple Triple::get32BitArchVariant() const {
     break;
 
   case Triple::amdil:
+  case Triple::hsail:
   case Triple::spir:
   case Triple::arm:
+  case Triple::armeb:
   case Triple::hexagon:
+  case Triple::kalimba:
   case Triple::le32:
   case Triple::mips:
   case Triple::mipsel:
@@ -789,17 +919,21 @@ Triple Triple::get32BitArchVariant() const {
   case Triple::sparc:
   case Triple::tce:
   case Triple::thumb:
+  case Triple::thumbeb:
   case Triple::x86:
   case Triple::xcore:
     // Already 32-bit.
     break;
 
+  case Triple::le64:      T.setArch(Triple::le32);    break;
   case Triple::mips64:    T.setArch(Triple::mips);    break;
   case Triple::mips64el:  T.setArch(Triple::mipsel);  break;
   case Triple::nvptx64:   T.setArch(Triple::nvptx);   break;
-  case Triple::ppc64:     T.setArch(Triple::ppc);   break;
+  case Triple::ppc64:     T.setArch(Triple::ppc);     break;
   case Triple::sparcv9:   T.setArch(Triple::sparc);   break;
   case Triple::x86_64:    T.setArch(Triple::x86);     break;
+  case Triple::amdil64:   T.setArch(Triple::amdil);   break;
+  case Triple::hsail64:   T.setArch(Triple::hsail);   break;
   case Triple::spir64:    T.setArch(Triple::spir);    break;
   }
   return T;
@@ -809,20 +943,24 @@ Triple Triple::get64BitArchVariant() const {
   Triple T(*this);
   switch (getArch()) {
   case Triple::UnknownArch:
-  case Triple::amdil:
   case Triple::arm:
+  case Triple::armeb:
   case Triple::hexagon:
-  case Triple::le32:
+  case Triple::kalimba:
   case Triple::msp430:
   case Triple::r600:
   case Triple::tce:
   case Triple::thumb:
+  case Triple::thumbeb:
   case Triple::xcore:
     T.setArch(UnknownArch);
     break;
 
   case Triple::aarch64:
   case Triple::aarch64_be:
+  case Triple::le64:
+  case Triple::amdil64:
+  case Triple::hsail64:
   case Triple::spir64:
   case Triple::mips64:
   case Triple::mips64el:
@@ -835,13 +973,99 @@ Triple Triple::get64BitArchVariant() const {
     // Already 64-bit.
     break;
 
+  case Triple::le32:    T.setArch(Triple::le64);      break;
   case Triple::mips:    T.setArch(Triple::mips64);    break;
   case Triple::mipsel:  T.setArch(Triple::mips64el);  break;
   case Triple::nvptx:   T.setArch(Triple::nvptx64);   break;
   case Triple::ppc:     T.setArch(Triple::ppc64);     break;
   case Triple::sparc:   T.setArch(Triple::sparcv9);   break;
   case Triple::x86:     T.setArch(Triple::x86_64);    break;
+  case Triple::amdil:   T.setArch(Triple::amdil64);   break;
+  case Triple::hsail:   T.setArch(Triple::hsail64);   break;
   case Triple::spir:    T.setArch(Triple::spir64);    break;
   }
   return T;
 }
+
+// FIXME: tblgen this.
+const char *Triple::getARMCPUForArch(StringRef MArch) const {
+  if (MArch.empty())
+    MArch = getArchName();
+
+  switch (getOS()) {
+  case llvm::Triple::FreeBSD:
+  case llvm::Triple::NetBSD:
+    if (MArch == "armv6")
+      return "arm1176jzf-s";
+    break;
+  case llvm::Triple::Win32:
+    // FIXME: this is invalid for WindowsCE
+    return "cortex-a9";
+  default:
+    break;
+  }
+
+  const char *result = nullptr;
+  size_t offset = StringRef::npos;
+  if (MArch.startswith("arm"))
+    offset = 3;
+  if (MArch.startswith("thumb"))
+    offset = 5;
+  if (offset != StringRef::npos && MArch.substr(offset, 2) == "eb")
+    offset += 2;
+  if (offset != StringRef::npos)
+    result = llvm::StringSwitch<const char *>(MArch.substr(offset))
+      .Cases("v2", "v2a", "arm2")
+      .Case("v3", "arm6")
+      .Case("v3m", "arm7m")
+      .Case("v4", "strongarm")
+      .Case("v4t", "arm7tdmi")
+      .Cases("v5", "v5t", "arm10tdmi")
+      .Cases("v5e", "v5te", "arm1022e")
+      .Case("v5tej", "arm926ej-s")
+      .Cases("v6", "v6k", "arm1136jf-s")
+      .Case("v6j", "arm1136j-s")
+      .Cases("v6z", "v6zk", "arm1176jzf-s")
+      .Case("v6t2", "arm1156t2-s")
+      .Cases("v6m", "v6-m", "cortex-m0")
+      .Cases("v7", "v7a", "v7-a", "v7l", "v7-l", "cortex-a8")
+      .Cases("v7s", "v7-s", "swift")
+      .Cases("v7r", "v7-r", "cortex-r4")
+      .Cases("v7m", "v7-m", "cortex-m3")
+      .Cases("v7em", "v7e-m", "cortex-m4")
+      .Cases("v8", "v8a", "v8-a", "cortex-a53")
+      .Default(nullptr);
+  else
+    result = llvm::StringSwitch<const char *>(MArch)
+      .Case("ep9312", "ep9312")
+      .Case("iwmmxt", "iwmmxt")
+      .Case("xscale", "xscale")
+      .Default(nullptr);
+
+  if (result)
+    return result;
+
+  // If all else failed, return the most base CPU with thumb interworking
+  // supported by LLVM.
+  // FIXME: Should warn once that we're falling back.
+  switch (getOS()) {
+  case llvm::Triple::NetBSD:
+    switch (getEnvironment()) {
+    case llvm::Triple::GNUEABIHF:
+    case llvm::Triple::GNUEABI:
+    case llvm::Triple::EABIHF:
+    case llvm::Triple::EABI:
+      return "arm926ej-s";
+    default:
+      return "strongarm";
+    }
+  default:
+    switch (getEnvironment()) {
+    case llvm::Triple::EABIHF:
+    case llvm::Triple::GNUEABIHF:
+      return "arm1176jzf-s";
+    default:
+      return "arm7tdmi";
+    }
+  }
+}