text: //===--- PPC.cpp - PPC Helpers for Tools ------------------------*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  #include "PPC.h"
  #include "ToolChains/CommonArgs.h"
  #include "clang/Driver/Driver.h"
  #include "clang/Driver/DriverDiagnostic.h"
  #include "clang/Driver/Options.h"
  #include "llvm/ADT/StringSwitch.h"
  #include "llvm/Option/ArgList.h"
  
  using namespace clang::driver;
  using namespace clang::driver::tools;
  using namespace clang;
  using namespace llvm::opt;
  
  /// getPPCTargetCPU - Get the (LLVM) name of the PowerPC cpu we are targeting.
  std::string ppc::getPPCTargetCPU(const ArgList &Args) {
    if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) {
      StringRef CPUName = A->getValue();
  
      if (CPUName == "native") {
        std::string CPU = llvm::sys::getHostCPUName();
        if (!CPU.empty() && CPU != "generic")
          return CPU;
        else
          return "";
      }
  
      return llvm::StringSwitch<const char *>(CPUName)
          .Case("common", "generic")
          .Case("440", "440")
          .Case("440fp", "440")
          .Case("450", "450")
          .Case("601", "601")
          .Case("602", "602")
          .Case("603", "603")
          .Case("603e", "603e")
          .Case("603ev", "603ev")
          .Case("604", "604")
          .Case("604e", "604e")
          .Case("620", "620")
          .Case("630", "pwr3")
          .Case("G3", "g3")
          .Case("7400", "7400")
          .Case("G4", "g4")
          .Case("7450", "7450")
          .Case("G4+", "g4+")
          .Case("750", "750")
          .Case("970", "970")
          .Case("G5", "g5")
          .Case("a2", "a2")
          .Case("a2q", "a2q")
          .Case("e500mc", "e500mc")
          .Case("e5500", "e5500")
          .Case("power3", "pwr3")
          .Case("power4", "pwr4")
          .Case("power5", "pwr5")
          .Case("power5x", "pwr5x")
          .Case("power6", "pwr6")
          .Case("power6x", "pwr6x")
          .Case("power7", "pwr7")
          .Case("power8", "pwr8")
          .Case("power9", "pwr9")
          .Case("pwr3", "pwr3")
          .Case("pwr4", "pwr4")
          .Case("pwr5", "pwr5")
          .Case("pwr5x", "pwr5x")
          .Case("pwr6", "pwr6")
          .Case("pwr6x", "pwr6x")
          .Case("pwr7", "pwr7")
          .Case("pwr8", "pwr8")
          .Case("pwr9", "pwr9")
          .Case("powerpc", "ppc")
          .Case("powerpc64", "ppc64")
          .Case("powerpc64le", "ppc64le")
          .Default("");
    }
  
    return "";
  }
  
  const char *ppc::getPPCAsmModeForCPU(StringRef Name) {
    return llvm::StringSwitch<const char *>(Name)
          .Case("pwr7", "-mpower7")
          .Case("power7", "-mpower7")
          .Case("pwr8", "-mpower8")
          .Case("power8", "-mpower8")
          .Case("ppc64le", "-mpower8")
          .Case("pwr9", "-mpower9")
          .Case("power9", "-mpower9")
          .Default("-many");
  }
  
  void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
                                 const ArgList &Args,
                                 std::vector<StringRef> &Features) {
    handleTargetFeaturesGroup(Args, Features, options::OPT_m_ppc_Features_Group);
  
    ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
    if (FloatABI == ppc::FloatABI::Soft)
      Features.push_back("-hard-float");
  }
  
  ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
    ppc::FloatABI ABI = ppc::FloatABI::Invalid;
    if (Arg *A =
            Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
                            options::OPT_mfloat_abi_EQ)) {
      if (A->getOption().matches(options::OPT_msoft_float))
        ABI = ppc::FloatABI::Soft;
      else if (A->getOption().matches(options::OPT_mhard_float))
        ABI = ppc::FloatABI::Hard;
      else {
        ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
                  .Case("soft", ppc::FloatABI::Soft)
                  .Case("hard", ppc::FloatABI::Hard)
                  .Default(ppc::FloatABI::Invalid);
        if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
          D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
          ABI = ppc::FloatABI::Hard;
        }
      }
    }
  
    // If unspecified, choose the default based on the platform.
    if (ABI == ppc::FloatABI::Invalid) {
      ABI = ppc::FloatABI::Hard;
    }
  
    return ABI;
  }
  
  bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) {
    Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
    return A && (A->getValue() == StringRef(Value));
  }
  