clang/lib/Basic/Targets/NVPTX.h

   1 //===--- NVPTX.h - Declare NVPTX 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 NVPTX TargetInfo objects.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
  14 #define LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
  15
  16 #include "clang/Basic/Cuda.h"
  17 #include "clang/Basic/TargetInfo.h"
  18 #include "clang/Basic/TargetOptions.h"
  19 #include "llvm/Support/Compiler.h"
  20 #include "llvm/TargetParser/Triple.h"
  21 #include <optional>
  22
  23 namespace clang {
  24 namespace targets {
  25
  26 static const unsigned NVPTXAddrSpaceMap[] = {
  27     0, // Default
  28     1, // opencl_global
  29     3, // opencl_local
  30     4, // opencl_constant
  31     0, // opencl_private
  32     // FIXME: generic has to be added to the target
  33     0, // opencl_generic
  34     1, // opencl_global_device
  35     1, // opencl_global_host
  36     1, // cuda_device
  37     4, // cuda_constant
  38     3, // cuda_shared
  39     1, // sycl_global
  40     1, // sycl_global_device
  41     1, // sycl_global_host
  42     3, // sycl_local
  43     0, // sycl_private
  44     0, // ptr32_sptr
  45     0, // ptr32_uptr
  46     0, // ptr64
  47     0, // hlsl_groupshared
  48 };
  49
  50 /// The DWARF address class. Taken from
  51 /// https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
  52 static const int NVPTXDWARFAddrSpaceMap[] = {
  53     -1, // Default, opencl_private or opencl_generic - not defined
  54     5,  // opencl_global
  55     -1,
  56     8,  // opencl_local or cuda_shared
  57     4,  // opencl_constant or cuda_constant
  58 };
  59
  60 class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public TargetInfo {
  61   static const char *const GCCRegNames[];
  62   CudaArch GPU;
  63   uint32_t PTXVersion;
  64   std::unique_ptr<TargetInfo> HostTarget;
  65
  66 public:
  67   NVPTXTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts,
  68                   unsigned TargetPointerWidth);
  69
  70   void getTargetDefines(const LangOptions &Opts,
  71                         MacroBuilder &Builder) const override;
  72
  73   ArrayRef<Builtin::Info> getTargetBuiltins() const override;
  74
  75   bool
  76   initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
  77                  StringRef CPU,
  78                  const std::vector<std::string> &FeaturesVec) const override {
  79     Features[CudaArchToString(GPU)] = true;
  80     Features["ptx" + std::to_string(PTXVersion)] = true;
  81     return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
  82   }
  83
  84   bool hasFeature(StringRef Feature) const override;
  85
  86   ArrayRef<const char *> getGCCRegNames() const override;
  87
  88   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
  89     // No aliases.
  90     return std::nullopt;
  91   }
  92
  93   bool validateAsmConstraint(const char *&Name,
  94                              TargetInfo::ConstraintInfo &Info) const override {
  95     switch (*Name) {
  96     default:
  97       return false;
  98     case 'c':
  99     case 'h':
 100     case 'r':
 101     case 'l':
 102     case 'f':
 103     case 'd':
 104       Info.setAllowsRegister();
 105       return true;
 106     }
 107   }
 108
 109   const char *getClobbers() const override {
 110     // FIXME: Is this really right?
 111     return "";
 112   }
 113
 114   BuiltinVaListKind getBuiltinVaListKind() const override {
 115     // FIXME: implement
 116     return TargetInfo::CharPtrBuiltinVaList;
 117   }
 118
 119   bool isValidCPUName(StringRef Name) const override {
 120     return StringToCudaArch(Name) != CudaArch::UNKNOWN;
 121   }
 122
 123   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override {
 124     for (int i = static_cast<int>(CudaArch::SM_20);
 125          i < static_cast<int>(CudaArch::Generic); ++i)
 126       Values.emplace_back(CudaArchToString(static_cast<CudaArch>(i)));
 127   }
 128
 129   bool setCPU(const std::string &Name) override {
 130     GPU = StringToCudaArch(Name);
 131     return GPU != CudaArch::UNKNOWN;
 132   }
 133
 134   void setSupportedOpenCLOpts() override {
 135     auto &Opts = getSupportedOpenCLOpts();
 136     Opts["cl_clang_storage_class_specifiers"] = true;
 137     Opts["__cl_clang_function_pointers"] = true;
 138     Opts["__cl_clang_variadic_functions"] = true;
 139     Opts["__cl_clang_non_portable_kernel_param_types"] = true;
 140     Opts["__cl_clang_bitfields"] = true;
 141
 142     Opts["cl_khr_fp64"] = true;
 143     Opts["__opencl_c_fp64"] = true;
 144     Opts["cl_khr_byte_addressable_store"] = true;
 145     Opts["cl_khr_global_int32_base_atomics"] = true;
 146     Opts["cl_khr_global_int32_extended_atomics"] = true;
 147     Opts["cl_khr_local_int32_base_atomics"] = true;
 148     Opts["cl_khr_local_int32_extended_atomics"] = true;
 149   }
 150
 151   const llvm::omp::GV &getGridValue() const override {
 152     return llvm::omp::NVPTXGridValues;
 153   }
 154
 155   /// \returns If a target requires an address within a target specific address
 156   /// space \p AddressSpace to be converted in order to be used, then return the
 157   /// corresponding target specific DWARF address space.
 158   ///
 159   /// \returns Otherwise return std::nullopt and no conversion will be emitted
 160   /// in the DWARF.
 161   std::optional<unsigned>
 162   getDWARFAddressSpace(unsigned AddressSpace) const override {
 163     if (AddressSpace >= std::size(NVPTXDWARFAddrSpaceMap) ||
 164         NVPTXDWARFAddrSpaceMap[AddressSpace] < 0)
 165       return std::nullopt;
 166     return NVPTXDWARFAddrSpaceMap[AddressSpace];
 167   }
 168
 169   CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
 170     // CUDA compilations support all of the host's calling conventions.
 171     //
 172     // TODO: We should warn if you apply a non-default CC to anything other than
 173     // a host function.
 174     if (HostTarget)
 175       return HostTarget->checkCallingConvention(CC);
 176     return CCCR_Warning;
 177   }
 178
 179   bool hasBitIntType() const override { return true; }
 180   bool hasBFloat16Type() const override { return true; }
 181   const char *getBFloat16Mangling() const override { return "u6__bf16"; };
 182 };
 183 } // namespace targets
 184 } // namespace clang
 185 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H