/usr/include/trilinos/impl/Kokkos_BitOps.hpp is in libtrilinos-kokkos-dev 12.10.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
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// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_BITOPS_HPP
#define KOKKOS_BITOPS_HPP
#include <Kokkos_Macros.hpp>
#include <stdint.h>
#include <climits>
namespace Kokkos {
namespace Impl {
KOKKOS_FORCEINLINE_FUNCTION
int bit_scan_forward( unsigned i )
{
#if defined( __CUDA_ARCH__ )
return __ffs(i) - 1;
#elif defined( __GNUC__ ) || defined( __GNUG__ )
return __builtin_ffs(i) - 1;
#elif defined( __INTEL_COMPILER )
return _bit_scan_forward(i);
#else
unsigned t = 1u;
int r = 0;
while ( i && ( i & t == 0 ) )
{
t = t << 1;
++r;
}
return r;
#endif
}
KOKKOS_FORCEINLINE_FUNCTION
int bit_scan_reverse( unsigned i )
{
enum { shift = static_cast<int>( sizeof(unsigned) * CHAR_BIT - 1 ) };
#if defined( __CUDA_ARCH__ )
return shift - __clz(i);
#elif defined( __GNUC__ ) || defined( __GNUG__ )
return shift - __builtin_clz(i);
#elif defined( __INTEL_COMPILER )
return _bit_scan_reverse(i);
#else
unsigned t = 1u << shift;
int r = 0;
while ( i && ( i & t == 0 ) )
{
t = t >> 1;
++r;
}
return r;
#endif
}
/// Count the number of bits set.
KOKKOS_FORCEINLINE_FUNCTION
int bit_count( unsigned i )
{
#if defined( __CUDA_ARCH__ )
return __popc(i);
#elif defined( __GNUC__ ) || defined( __GNUG__ )
return __builtin_popcount(i);
#elif defined ( __INTEL_COMPILER )
return _popcnt32(i);
#else
// http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetNaive
i = i - ( ( i >> 1 ) & ~0u / 3u ); // temp
i = ( i & ~0u / 15u * 3u ) + ( ( i >> 2 ) & ~0u / 15u * 3u ); // temp
i = ( i + ( i >> 4 ) ) & ~0u / 255u * 15u; // temp
// count
return (int)( ( i * ( ~0u / 255u ) ) >> ( sizeof(unsigned) - 1 ) * CHAR_BIT );
#endif
}
} // namespace Impl
} // namespace Kokkos
#endif // KOKKOS_BITOPS_HPP
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