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/Support/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 FastUnalignedAccess;
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   bool useFP16ConversionIntrinsics() const override {
114     return false;
115   }
116 
117   bool isValidCPUName(StringRef Name) const override;
118   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
119   bool isValidTuneCPUName(StringRef Name) const override;
120   void fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values) const override;
121   bool supportsTargetAttributeTune() const override { return true; }
122   ParsedTargetAttr parseTargetAttr(StringRef Str) const override;
123 };
124 class LLVM_LIBRARY_VISIBILITY RISCV32TargetInfo : public RISCVTargetInfo {
125 public:
126   RISCV32TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
127       : RISCVTargetInfo(Triple, Opts) {
128     IntPtrType = SignedInt;
129     PtrDiffType = SignedInt;
130     SizeType = UnsignedInt;
131     resetDataLayout("e-m:e-p:32:32-i64:64-n32-S128");
132   }
133 
134   bool setABI(const std::string &Name) override {
135     if (Name == "ilp32" || Name == "ilp32f" || Name == "ilp32d") {
136       ABI = Name;
137       return true;
138     }
139     return false;
140   }
141 
142   void setMaxAtomicWidth() override {
143     MaxAtomicPromoteWidth = 128;
144 
145     if (ISAInfo->hasExtension("a"))
146       MaxAtomicInlineWidth = 32;
147   }
148 };
149 class LLVM_LIBRARY_VISIBILITY RISCV64TargetInfo : public RISCVTargetInfo {
150 public:
151   RISCV64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
152       : RISCVTargetInfo(Triple, Opts) {
153     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
154     IntMaxType = Int64Type = SignedLong;
155     resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
156   }
157 
158   bool setABI(const std::string &Name) override {
159     if (Name == "lp64" || Name == "lp64f" || Name == "lp64d") {
160       ABI = Name;
161       return true;
162     }
163     return false;
164   }
165 
166   void setMaxAtomicWidth() override {
167     MaxAtomicPromoteWidth = 128;
168 
169     if (ISAInfo->hasExtension("a"))
170       MaxAtomicInlineWidth = 64;
171   }
172 };
173 } // namespace targets
174 } // namespace clang
175 
176 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H
177