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Bit manipulation¶Defined in header <Kokkos_BitManipulation.hpp> which is included from <Kokkos_Core.hpp>
Provides function templates from the standard library header <bit> (since C++20).
Bit manipulation function templates are defined in the Kokkos:: namespace since Kokkos 4.1
reinterpret the object representation of one type as that of another (see note below)
reverses the bytes in the given integer value
checks if a number is an integral power of two
finds the smallest integral power of two not less than the given value
finds the largest integral power of two not greater than the given value
finds the smallest number of bits needed to represent the given value
computes the result of bitwise left-rotation
computes the result of bitwise right-rotation
counts the number of consecutive 0 bits, starting from the most significant bit
counts the number of consecutive 1 bits, starting from the most significant bit
counts the number of consecutive 0 bits, starting from the least significant bit
counts the number of consecutive 1 bits, starting from the least significant bit
counts the number of 1 bits in an unsigned integer
Notes¶For all the above template functions, a non-constexpr counterpart ending with the *_builtin suffix is provided in the Kokkos::Experimental:: namespace to make up for some compiler intrinsics that cannot appear in constant expressions.
In contrast to its counterpart in the C++ standard library, Kokkos::bit_cast is not usable in constant expressions (not a constexpr function) as it is not implementable as a library facility and requires compiler magic which is not available to us.
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