1 //===--- RISCV.h - Declare RISC-V target feature support --------*- 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 declares RISC-V TargetInfo objects. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H 14 #define LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H 15 16 #include "clang/Basic/TargetInfo.h" 17 #include "clang/Basic/TargetOptions.h" 18 #include "llvm/Support/Compiler.h" 19 #include "llvm/TargetParser/RISCVISAInfo.h" 20 #include "llvm/TargetParser/Triple.h" 21 #include <optional> 22 23 namespace clang { 24 namespace targets { 25 26 // RISC-V Target 27 class RISCVTargetInfo : public TargetInfo { 28 protected: 29 std::string ABI, CPU; 30 std::unique_ptr<llvm::RISCVISAInfo> ISAInfo; 31 32 private: 33 bool FastScalarUnalignedAccess; 34 bool HasExperimental = false; 35 36 public: 37 RISCVTargetInfo(const llvm::Triple &Triple, const TargetOptions &) 38 : TargetInfo(Triple) { 39 BFloat16Width = 16; 40 BFloat16Align = 16; 41 BFloat16Format = &llvm::APFloat::BFloat(); 42 LongDoubleWidth = 128; 43 LongDoubleAlign = 128; 44 LongDoubleFormat = &llvm::APFloat::IEEEquad(); 45 SuitableAlign = 128; 46 WCharType = SignedInt; 47 WIntType = UnsignedInt; 48 HasRISCVVTypes = true; 49 MCountName = "_mcount"; 50 HasFloat16 = true; 51 HasStrictFP = true; 52 } 53 54 bool setCPU(const std::string &Name) override { 55 if (!isValidCPUName(Name)) 56 return false; 57 CPU = Name; 58 return true; 59 } 60 61 StringRef getABI() const override { return ABI; } 62 void getTargetDefines(const LangOptions &Opts, 63 MacroBuilder &Builder) const override; 64 65 ArrayRef<Builtin::Info> getTargetBuiltins() const override; 66 67 BuiltinVaListKind getBuiltinVaListKind() const override { 68 return TargetInfo::VoidPtrBuiltinVaList; 69 } 70 71 std::string_view getClobbers() const override { return ""; } 72 73 StringRef getConstraintRegister(StringRef Constraint, 74 StringRef Expression) const override { 75 return Expression; 76 } 77 78 ArrayRef<const char *> getGCCRegNames() const override; 79 80 int getEHDataRegisterNumber(unsigned RegNo) const override { 81 if (RegNo == 0) 82 return 10; 83 else if (RegNo == 1) 84 return 11; 85 else 86 return -1; 87 } 88 89 ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override; 90 91 bool validateAsmConstraint(const char *&Name, 92 TargetInfo::ConstraintInfo &Info) const override; 93 94 std::string convertConstraint(const char *&Constraint) const override; 95 96 bool 97 initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, 98 StringRef CPU, 99 const std::vector<std::string> &FeaturesVec) const override; 100 101 std::optional<std::pair<unsigned, unsigned>> 102 getVScaleRange(const LangOptions &LangOpts) const override; 103 104 bool hasFeature(StringRef Feature) const override; 105 106 bool handleTargetFeatures(std::vector<std::string> &Features, 107 DiagnosticsEngine &Diags) override; 108 109 bool hasBitIntType() const override { return true; } 110 111 bool hasBFloat16Type() const override { return true; } 112 113 CallingConvCheckResult checkCallingConvention(CallingConv CC) const override; 114 115 bool useFP16ConversionIntrinsics() const override { 116 return false; 117 } 118 119 bool isValidCPUName(StringRef Name) const override; 120 void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override; 121 bool isValidTuneCPUName(StringRef Name) const override; 122 void fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values) const override; 123 bool supportsTargetAttributeTune() const override { return true; } 124 ParsedTargetAttr parseTargetAttr(StringRef Str) const override; 125 uint64_t getFMVPriority(ArrayRef<StringRef> Features) const override; 126 127 std::pair<unsigned, unsigned> hardwareInterferenceSizes() const override { 128 return std::make_pair(32, 32); 129 } 130 131 bool supportsCpuSupports() const override { return getTriple().isOSLinux(); } 132 bool supportsCpuIs() const override { return getTriple().isOSLinux(); } 133 bool supportsCpuInit() const override { return getTriple().isOSLinux(); } 134 bool validateCpuSupports(StringRef Feature) const override; 135 bool validateCpuIs(StringRef CPUName) const override; 136 bool isValidFeatureName(StringRef Name) const override; 137 138 bool validateGlobalRegisterVariable(StringRef RegName, unsigned RegSize, 139 bool &HasSizeMismatch) const override; 140 141 bool checkCFProtectionBranchSupported(DiagnosticsEngine &) const override { 142 // Always generate Zicfilp lpad insns 143 // Non-zicfilp CPUs would read them as NOP 144 return true; 145 } 146 147 bool 148 checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const override { 149 if (ISAInfo->hasExtension("zicfiss")) 150 return true; 151 return TargetInfo::checkCFProtectionReturnSupported(Diags); 152 } 153 154 CFBranchLabelSchemeKind getDefaultCFBranchLabelScheme() const override { 155 return CFBranchLabelSchemeKind::FuncSig; 156 } 157 158 bool 159 checkCFBranchLabelSchemeSupported(const CFBranchLabelSchemeKind Scheme, 160 DiagnosticsEngine &Diags) const override { 161 switch (Scheme) { 162 case CFBranchLabelSchemeKind::Default: 163 case CFBranchLabelSchemeKind::Unlabeled: 164 case CFBranchLabelSchemeKind::FuncSig: 165 return true; 166 } 167 return TargetInfo::checkCFBranchLabelSchemeSupported(Scheme, Diags); 168 } 169 }; 170 class LLVM_LIBRARY_VISIBILITY RISCV32TargetInfo : public RISCVTargetInfo { 171 public: 172 RISCV32TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts) 173 : RISCVTargetInfo(Triple, Opts) { 174 IntPtrType = SignedInt; 175 PtrDiffType = SignedInt; 176 SizeType = UnsignedInt; 177 resetDataLayout("e-m:e-p:32:32-i64:64-n32-S128"); 178 } 179 180 bool setABI(const std::string &Name) override { 181 if (Name == "ilp32e") { 182 ABI = Name; 183 resetDataLayout("e-m:e-p:32:32-i64:64-n32-S32"); 184 return true; 185 } 186 187 if (Name == "ilp32" || Name == "ilp32f" || Name == "ilp32d") { 188 ABI = Name; 189 return true; 190 } 191 return false; 192 } 193 194 void setMaxAtomicWidth() override { 195 MaxAtomicPromoteWidth = 128; 196 197 if (ISAInfo->hasExtension("a")) 198 MaxAtomicInlineWidth = 32; 199 } 200 }; 201 class LLVM_LIBRARY_VISIBILITY RISCV64TargetInfo : public RISCVTargetInfo { 202 public: 203 RISCV64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts) 204 : RISCVTargetInfo(Triple, Opts) { 205 LongWidth = LongAlign = PointerWidth = PointerAlign = 64; 206 IntMaxType = Int64Type = SignedLong; 207 resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"); 208 } 209 210 bool setABI(const std::string &Name) override { 211 if (Name == "lp64e") { 212 ABI = Name; 213 resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S64"); 214 return true; 215 } 216 217 if (Name == "lp64" || Name == "lp64f" || Name == "lp64d") { 218 ABI = Name; 219 return true; 220 } 221 return false; 222 } 223 224 void setMaxAtomicWidth() override { 225 MaxAtomicPromoteWidth = 128; 226 227 if (ISAInfo->hasExtension("a")) 228 MaxAtomicInlineWidth = 64; 229 } 230 }; 231 } // namespace targets 232 } // namespace clang 233 234 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H 235