OffloadArch.h

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//===--- OffloadArch.h - Definition of offloading architectures --- 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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_BASIC_OFFLOADARCH_H
#define LLVM_CLANG_BASIC_OFFLOADARCH_H
 
#include "llvm/ADT/StringRef.h"
#include "llvm/TargetParser/Triple.h"
#include <cstdint>
#include <tuple>
 
namespace llvm {
template <typename T> class SmallVectorImpl;
namespace NVPTX {
enum GPUKind : uint8_t;
}
namespace AMDGPU {
enum GPUKind : uint8_t;
}
} // namespace llvm
 
namespace clang {
 
/// A processor an offloading action can target. This is a tagged handle pairing
/// a TargetArch with the matching TargetParser GPU kind; it does not enumerate
/// individual GPUs, so new targets are added in the TargetParser data alone.
class OffloadArch {
public:
  enum class TargetArch : uint8_t {
    Unused,      // Default-constructed; no architecture bound.
    Unknown,     // A name that matched no known architecture.
    NVPTX,       // Kind is an llvm::NVPTX::GPUKind.
    AMDGPU,      // Kind is an llvm::AMDGPU::GPUKind.
    AMDGCNSPIRV, // The 'amdgcnspirv' pseudo target.
    IntelCPU,    // Kind is an IntelArch.
    IntelGPU,    // Kind is an IntelArch.
    Generic,     // The 'generic' processor model.
  };
 
  // Intel architectures, which have no TargetParser list yet.
  enum class IntelArch : uint32_t {
    GRANITERAPIDS,
    BMG_G21,
  };
 
private:
  // Interpreted according to V; unused for the tagless TargetArch values.
  uint32_t Kind = 0;
  TargetArch V = TargetArch::Unused;
 
  constexpr OffloadArch(TargetArch V, uint32_t Kind) : Kind(Kind), V(V) {}
 
public:
  constexpr OffloadArch() = default;
 
  static OffloadArch getNVPTX(llvm::NVPTX::GPUKind K) {
    return {TargetArch::NVPTX, static_cast<uint32_t>(K)};
  }
  static OffloadArch getAMDGPU(llvm::AMDGPU::GPUKind K) {
    return {TargetArch::AMDGPU, static_cast<uint32_t>(K)};
  }
  static constexpr OffloadArch getIntel(TargetArch V, IntelArch A) {
    return {V, static_cast<uint32_t>(A)};
  }
  static constexpr OffloadArch getUnused() { return {TargetArch::Unused, 0}; }
  static constexpr OffloadArch getUnknown() { return {TargetArch::Unknown, 0}; }
  static constexpr OffloadArch getAMDGCNSPIRV() {
    return {TargetArch::AMDGCNSPIRV, 0};
  }
  static constexpr OffloadArch getGeneric() { return {TargetArch::Generic, 0}; }
 
  /// Default architectures used when the user does not specify one.
  static OffloadArch CudaDefault();
  static OffloadArch HIPDefault();
 
  TargetArch targetArch() const { return V; }
 
  bool isNVPTX() const { return V == TargetArch::NVPTX; }
  bool isAMDGPU() const { return V == TargetArch::AMDGPU; }
  bool isAMDGCNSPIRV() const { return V == TargetArch::AMDGCNSPIRV; }
  bool isIntelCPU() const { return V == TargetArch::IntelCPU; }
  bool isIntelGPU() const { return V == TargetArch::IntelGPU; }
  bool isIntel() const { return isIntelCPU() || isIntelGPU(); }
  bool isGeneric() const { return V == TargetArch::Generic; }
  bool isUnused() const { return V == TargetArch::Unused; }
  bool isUnknown() const { return V == TargetArch::Unknown; }
 
  // Only valid when isNVPTX() / isAMDGPU() respectively.
  llvm::NVPTX::GPUKind nvptxKind() const {
    return static_cast<llvm::NVPTX::GPUKind>(Kind);
  }
  llvm::AMDGPU::GPUKind amdgpuKind() const {
    return static_cast<llvm::AMDGPU::GPUKind>(Kind);
  }
 
  bool operator==(const OffloadArch &Other) const {
    return V == Other.V && Kind == Other.Kind;
  }
  bool operator!=(const OffloadArch &Other) const { return !(*this == Other); }
 
  bool operator<(const OffloadArch &Other) const {
    return std::tie(V, Kind) < std::tie(Other.V, Other.Kind);
  }
};
 
const char *OffloadArchToString(OffloadArch A);
const char *OffloadArchToVirtualArchString(OffloadArch A);
 
// Convert a string to an OffloadArch. Returns an Unknown OffloadArch if the
// string is not recognized.
OffloadArch StringToOffloadArch(llvm::StringRef S);
 
/// Append the canonical names of all NVIDIA and AMDGPU GPUs.
void fillValidOffloadArchList(llvm::SmallVectorImpl<llvm::StringRef> &Values);
 
OffloadArch getSubArchOffloadArch(llvm::Triple::SubArchType SubArch);
llvm::Triple::SubArchType getOffloadArchSubArch(OffloadArch ID);
 
llvm::Triple OffloadArchToTriple(const llvm::Triple &DefaultToolchainTriple,
                                 OffloadArch ID);
 
/// Represents a bound architecture for offload / multiple architecture
/// compilation.
struct BoundArch {
  llvm::StringRef ArchName;
 
  /// The parsed offload architecture.
  /// Will be an Unknown OffloadArch if ArchName is not recognized.
  OffloadArch Arch = OffloadArch::getUnused();
 
  BoundArch() = default;
  explicit BoundArch(llvm::StringRef Name)
      : ArchName(Name), Arch(Name.empty() ? OffloadArch::getUnknown()
                                          : StringToOffloadArch(Name)) {}
 
  BoundArch(llvm::StringRef Name, OffloadArch A) : ArchName(Name), Arch(A) {}
 
  bool empty() const { return ArchName.empty(); }
  explicit operator bool() const { return !Arch.isUnused(); }
 
  bool operator==(const BoundArch &Other) const {
    return Arch == Other.Arch && ArchName == Other.ArchName;
  }
 
  bool operator<(const BoundArch &Other) const {
    return std::tie(Arch, ArchName) < std::tie(Other.Arch, Other.ArchName);
  }
};
 
} // namespace clang
 
#endif // LLVM_CLANG_BASIC_OFFLOADARCH_H