intrinsics.hpp

// SPDX-FileCopyrightText: 2017 - 2025 The Ginkgo authors
//
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef GKO_PUBLIC_CORE_BASE_INTRINSICS_HPP_
#define GKO_PUBLIC_CORE_BASE_INTRINSICS_HPP_
 
 
#include <bitset>
 
#include <ginkgo/core/base/types.hpp>
 
 
namespace gko {
namespace detail {
 

GKO_ATTRIBUTES GKO_INLINE int popcount(uint32 bitmask)
{
#if defined(__CUDA_ARCH__) || defined(__HIP_DEVICE_COMPILE__)
    return __popc(static_cast<unsigned>(bitmask));
#else
    std::bitset<32> bits{bitmask};
    return bits.count();
#endif
}
 

GKO_ATTRIBUTES GKO_INLINE int popcount(uint64 bitmask)
{
#if defined(__CUDA_ARCH__) || defined(__HIP_DEVICE_COMPILE__)
    return __popcll(static_cast<unsigned long long>(bitmask));
#else
    std::bitset<64> bits{bitmask};
    return bits.count();
#endif
}
 
 
}  // namespace detail
}  // namespace gko
 
#endif  // GKO_PUBLIC_CORE_BASE_INTRINSICS_HPP_