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//===--- NVPTX.h - Declare NVPTX target feature support ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares NVPTX TargetInfo objects.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
#define LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
#include "clang/Basic/Cuda.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "llvm/Support/Compiler.h"
#include "llvm/TargetParser/Triple.h"
#include <optional>
namespace clang {
namespace targets {
static const unsigned NVPTXAddrSpaceMap[] = {
0, // Default
1, // opencl_global
3, // opencl_local
4, // opencl_constant
0, // opencl_private
// FIXME: generic has to be added to the target
0, // opencl_generic
1, // opencl_global_device
1, // opencl_global_host
1, // cuda_device
4, // cuda_constant
3, // cuda_shared
1, // sycl_global
1, // sycl_global_device
1, // sycl_global_host
3, // sycl_local
0, // sycl_private
0, // ptr32_sptr
0, // ptr32_uptr
0, // ptr64
0, // hlsl_groupshared
// Wasm address space values for this target are dummy values,
// as it is only enabled for Wasm targets.
20, // wasm_funcref
};
/// The DWARF address class. Taken from
/// https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
static const int NVPTXDWARFAddrSpaceMap[] = {
-1, // Default, opencl_private or opencl_generic - not defined
5, // opencl_global
-1,
8, // opencl_local or cuda_shared
4, // opencl_constant or cuda_constant
};
class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public TargetInfo {
static const char *const GCCRegNames[];
OffloadArch GPU;
uint32_t PTXVersion;
std::unique_ptr<TargetInfo> HostTarget;
public:
NVPTXTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts,
unsigned TargetPointerWidth);
void getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const override;
ArrayRef<Builtin::Info> getTargetBuiltins() const override;
bool useFP16ConversionIntrinsics() const override { return false; }
bool
initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
StringRef CPU,
const std::vector<std::string> &FeaturesVec) const override {
if (GPU != OffloadArch::UNUSED)
Features[OffloadArchToString(GPU)] = true;
Features["ptx" + std::to_string(PTXVersion)] = true;
return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
}
bool hasFeature(StringRef Feature) const override;
ArrayRef<const char *> getGCCRegNames() const override;
ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
// No aliases.
return std::nullopt;
}
bool validateAsmConstraint(const char *&Name,
TargetInfo::ConstraintInfo &Info) const override {
switch (*Name) {
default:
return false;
case 'c':
case 'h':
case 'r':
case 'l':
case 'f':
case 'd':
case 'q':
Info.setAllowsRegister();
return true;
}
}
std::string_view getClobbers() const override {
// FIXME: Is this really right?
return "";
}
BuiltinVaListKind getBuiltinVaListKind() const override {
return TargetInfo::VoidPtrBuiltinVaList;
}
bool isValidCPUName(StringRef Name) const override {
return StringToOffloadArch(Name) != OffloadArch::UNKNOWN;
}
void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override {
for (int i = static_cast<int>(OffloadArch::SM_20);
i < static_cast<int>(OffloadArch::Generic); ++i)
Values.emplace_back(OffloadArchToString(static_cast<OffloadArch>(i)));
}
bool setCPU(const std::string &Name) override {
GPU = StringToOffloadArch(Name);
return GPU != OffloadArch::UNKNOWN;
}
void setSupportedOpenCLOpts() override {
auto &Opts = getSupportedOpenCLOpts();
Opts["cl_clang_storage_class_specifiers"] = true;
Opts["__cl_clang_function_pointers"] = true;
Opts["__cl_clang_variadic_functions"] = true;
Opts["__cl_clang_non_portable_kernel_param_types"] = true;
Opts["__cl_clang_bitfields"] = true;
Opts["cl_khr_fp64"] = true;
Opts["__opencl_c_fp64"] = true;
Opts["cl_khr_byte_addressable_store"] = true;
Opts["cl_khr_global_int32_base_atomics"] = true;
Opts["cl_khr_global_int32_extended_atomics"] = true;
Opts["cl_khr_local_int32_base_atomics"] = true;
Opts["cl_khr_local_int32_extended_atomics"] = true;
}
const llvm::omp::GV &getGridValue() const override {
return llvm::omp::NVPTXGridValues;
}
/// \returns If a target requires an address within a target specific address
/// space \p AddressSpace to be converted in order to be used, then return the
/// corresponding target specific DWARF address space.
///
/// \returns Otherwise return std::nullopt and no conversion will be emitted
/// in the DWARF.
std::optional<unsigned>
getDWARFAddressSpace(unsigned AddressSpace) const override {
if (AddressSpace >= std::size(NVPTXDWARFAddrSpaceMap) ||
NVPTXDWARFAddrSpaceMap[AddressSpace] < 0)
return std::nullopt;
return NVPTXDWARFAddrSpaceMap[AddressSpace];
}
CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
// CUDA compilations support all of the host's calling conventions.
//
// TODO: We should warn if you apply a non-default CC to anything other than
// a host function.
if (HostTarget)
return HostTarget->checkCallingConvention(CC);
return CCCR_Warning;
}
bool hasBitIntType() const override { return true; }
bool hasBFloat16Type() const override { return true; }
OffloadArch getGPU() const { return GPU; }
};
} // namespace targets
} // namespace clang
#endif // LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
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