clang/lib/Driver/ToolChains/Arch/PPC.cpp

   1 //===--- PPC.cpp - PPC Helpers for Tools ------------------------*- 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 #include "PPC.h"
  10 #include "ToolChains/CommonArgs.h"
  11 #include "clang/Driver/Driver.h"
  12 #include "clang/Driver/DriverDiagnostic.h"
  13 #include "clang/Driver/Options.h"
  14 #include "llvm/ADT/StringSwitch.h"
  15 #include "llvm/Option/ArgList.h"
  16 #include "llvm/TargetParser/Host.h"
  17
  18 using namespace clang::driver;
  19 using namespace clang::driver::tools;
  20 using namespace clang;
  21 using namespace llvm::opt;
  22
  23 static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
  24   // LLVM may default to generating code for the native CPU,
  25   // but, like gcc, we default to a more generic option for
  26   // each architecture. (except on AIX)
  27   if (T.isOSAIX())
  28     return "pwr7";
  29   else if (T.getArch() == llvm::Triple::ppc64le)
  30     return "ppc64le";
  31   else if (T.getArch() == llvm::Triple::ppc64)
  32     return "ppc64";
  33   else
  34     return "ppc";
  35 }
  36
  37 static std::string normalizeCPUName(StringRef CPUName, const llvm::Triple &T) {
  38   // Clang/LLVM does not actually support code generation
  39   // for the 405 CPU. However, there are uses of this CPU ID
  40   // in projects that previously used GCC and rely on Clang
  41   // accepting it. Clang has always ignored it and passed the
  42   // generic CPU ID to the back end.
  43   if (CPUName == "generic" || CPUName == "405")
  44     return getPPCGenericTargetCPU(T);
  45
  46   if (CPUName == "native") {
  47     std::string CPU = std::string(llvm::sys::getHostCPUName());
  48     if (!CPU.empty() && CPU != "generic")
  49       return CPU;
  50     else
  51       return getPPCGenericTargetCPU(T);
  52   }
  53
  54   return llvm::StringSwitch<const char *>(CPUName)
  55       .Case("common", "generic")
  56       .Case("440fp", "440")
  57       .Case("630", "pwr3")
  58       .Case("G3", "g3")
  59       .Case("G4", "g4")
  60       .Case("G4+", "g4+")
  61       .Case("8548", "e500")
  62       .Case("G5", "g5")
  63       .Case("power3", "pwr3")
  64       .Case("power4", "pwr4")
  65       .Case("power5", "pwr5")
  66       .Case("power5x", "pwr5x")
  67       .Case("power6", "pwr6")
  68       .Case("power6x", "pwr6x")
  69       .Case("power7", "pwr7")
  70       .Case("power8", "pwr8")
  71       .Case("power9", "pwr9")
  72       .Case("power10", "pwr10")
  73       .Case("future", "future")
  74       .Case("powerpc", "ppc")
  75       .Case("powerpc64", "ppc64")
  76       .Case("powerpc64le", "ppc64le")
  77       .Default(CPUName.data());
  78 }
  79
  80 /// Get the (LLVM) name of the PowerPC cpu we are tuning for.
  81 std::string ppc::getPPCTuneCPU(const ArgList &Args, const llvm::Triple &T) {
  82   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))
  83     return normalizeCPUName(A->getValue(), T);
  84   return getPPCGenericTargetCPU(T);
  85 }
  86
  87 /// Get the (LLVM) name of the PowerPC cpu we are targeting.
  88 std::string ppc::getPPCTargetCPU(const Driver &D, const ArgList &Args,
  89                                  const llvm::Triple &T) {
  90   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ))
  91     return normalizeCPUName(A->getValue(), T);
  92   return getPPCGenericTargetCPU(T);
  93 }
  94
  95 const char *ppc::getPPCAsmModeForCPU(StringRef Name) {
  96   return llvm::StringSwitch<const char *>(Name)
  97       .Case("pwr7", "-mpower7")
  98       .Case("power7", "-mpower7")
  99       .Case("pwr8", "-mpower8")
 100       .Case("power8", "-mpower8")
 101       .Case("ppc64le", "-mpower8")
 102       .Case("pwr9", "-mpower9")
 103       .Case("power9", "-mpower9")
 104       .Case("pwr10", "-mpower10")
 105       .Case("power10", "-mpower10")
 106       .Default("-many");
 107 }
 108
 109 void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
 110                                const ArgList &Args,
 111                                std::vector<StringRef> &Features) {
 112   if (Triple.getSubArch() == llvm::Triple::PPCSubArch_spe)
 113     Features.push_back("+spe");
 114
 115   handleTargetFeaturesGroup(D, Triple, Args, Features,
 116                             options::OPT_m_ppc_Features_Group);
 117
 118   ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
 119   if (FloatABI == ppc::FloatABI::Soft)
 120     Features.push_back("-hard-float");
 121
 122   ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Triple, Args);
 123   if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt)
 124     Features.push_back("+secure-plt");
 125 }
 126
 127 ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple,
 128                                               const ArgList &Args) {
 129   if (Args.getLastArg(options::OPT_msecure_plt))
 130     return ppc::ReadGOTPtrMode::SecurePlt;
 131   if (Triple.isPPC32SecurePlt())
 132     return ppc::ReadGOTPtrMode::SecurePlt;
 133   else
 134     return ppc::ReadGOTPtrMode::Bss;
 135 }
 136
 137 ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
 138   ppc::FloatABI ABI = ppc::FloatABI::Invalid;
 139   if (Arg *A =
 140           Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
 141                           options::OPT_mfloat_abi_EQ)) {
 142     if (A->getOption().matches(options::OPT_msoft_float))
 143       ABI = ppc::FloatABI::Soft;
 144     else if (A->getOption().matches(options::OPT_mhard_float))
 145       ABI = ppc::FloatABI::Hard;
 146     else {
 147       ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
 148                 .Case("soft", ppc::FloatABI::Soft)
 149                 .Case("hard", ppc::FloatABI::Hard)
 150                 .Default(ppc::FloatABI::Invalid);
 151       if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
 152         D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
 153         ABI = ppc::FloatABI::Hard;
 154       }
 155     }
 156   }
 157
 158   // If unspecified, choose the default based on the platform.
 159   if (ABI == ppc::FloatABI::Invalid) {
 160     ABI = ppc::FloatABI::Hard;
 161   }
 162
 163   return ABI;
 164 }
 165
 166 bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) {
 167   Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
 168   return A && (A->getValue() == StringRef(Value));
 169 }