Looks like an extra loop

[SergeyKopienko]

oneDPL/include/oneapi/dpl/pstl/algorithm_impl.h

Line 358 in d075f89

for (; __begin != __end; ++__begin)

Probably we may replace the next code

        for (; __begin != __end; ++__begin)
            ;
        return ::std::get<1>(__begin.base());

by one simple call line in __pattern_walk2(__parallel_forward_tag :

return __first2 + (__last1 - __first1);