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 } 170