cleanup unnecessary code

Signed-off-by: Dan Hoeflinger <dan.hoeflinger@intel.com>

include/oneapi/dpl/internal/version_impl.h

@@ -20,7 +20,6 @@
 #    define _ONEDPL_STD_FEATURE_MACROS_PRESENT 1
 // Clang 15 and older do not support range adaptors, see https://bugs.llvm.org/show_bug.cgi?id=44833
 #    define _ONEDPL_CPP20_RANGES_PRESENT ((__cpp_lib_ranges >= 201911L) && !(__clang__ && __clang_major__ < 16))
-#    define _ONEDPL_CPP20_ATOMIC_REF_PRESENT (__cpp_lib_atomic_ref >= 201806L)
 #else
 #    define _ONEDPL_STD_FEATURE_MACROS_PRESENT 0
 #    define _ONEDPL_CPP20_RANGES_PRESENT 0

include/oneapi/dpl/pstl/algorithm_impl.h

@@ -20,7 +20,6 @@
 #include <type_traits>
 #include <functional>
 #include <algorithm>
-#include <memory>
 
 #include "algorithm_fwd.h"
 

include/oneapi/dpl/pstl/parallel_backend_omp.h

@@ -62,9 +62,4 @@
 //------------------------------------------------------------------------
 #include "./omp/parallel_merge.h"
 
-//------------------------------------------------------------------------
-// parallel_histogram
-//------------------------------------------------------------------------
-#include "./omp/parallel_histogram.h"
-
 #endif //_ONEDPL_PARALLEL_BACKEND_OMP_H

include/oneapi/dpl/pstl/parallel_backend_serial.h

@@ -153,18 +153,6 @@ __parallel_for_each(oneapi::dpl::__internal::__serial_backend_tag, _ExecutionPol
         __f(*__iter);
 }
 
-template <typename _ExecutionPolicy, typename _RandomAccessIterator1, typename _Size, typename _RandomAccessIterator2,
-          typename _FpHist, typename _FpInitialize, typename _FpAccum>
-void
-__parallel_histogram(oneapi::dpl::__internal::__serial_backend_tag, _ExecutionPolicy&& exec,
-                     _RandomAccessIterator1 __first, _RandomAccessIterator1 __last, _Size __num_bins,
-                     _RandomAccessIterator2 __histogram_first, _FpHist __f, _FpInitialize, _FpAccum)
-{
-    using _HistogramValueT = typename ::std::iterator_traits<_RandomAccessIterator2>::value_type;
-    ::std::fill(__histogram_first, __histogram_first + __num_bins, _HistogramValueT{0});
-    __f(__first, __last, __histogram_first);
-}
-
 } // namespace __serial_backend
 } // namespace dpl
 } // namespace oneapi

include/oneapi/dpl/pstl/parallel_backend_tbb.h

@@ -1331,39 +1331,6 @@ struct __thread_enumerable_storage
     tbb::enumerable_thread_specific<std::vector<_ValueType>> __thread_specific_storage;
 };
 
-//------------------------------------------------------------------------
-// parallel_histogram
-//------------------------------------------------------------------------
-template <class _ExecutionPolicy, typename _RandomAccessIterator1, typename _Size, typename _RandomAccessIterator2,
-          typename _FpHist, typename _FpInitialize, typename _FpAccum>
-void
-__parallel_histogram(oneapi::dpl::__internal::__tbb_backend_tag, _ExecutionPolicy&&, _RandomAccessIterator1 __first,
-                     _RandomAccessIterator1 __last, _Size __num_bins, _RandomAccessIterator2 __histogram_first,
-                     _FpHist __f, _FpInitialize __init, _FpAccum __accum)
-{
-    using _HistogramValueT = typename ::std::iterator_traits<_RandomAccessIterator2>::value_type;
-
-    tbb::this_task_arena::isolate([&]() {
-        tbb::enumerable_thread_specific<std::vector<_HistogramValueT>> __thread_local_histogram(__num_bins,
-                                                                                                _HistogramValueT{0});
-        size_t __n = __last - __first;
-        tbb::parallel_for(tbb::blocked_range<_Size>(0, __n, 1024), [&](const tbb::blocked_range<_Size>& __range) {
-            std::vector<_HistogramValueT>& __local_histogram = __thread_local_histogram.local();
-            __f(__first + __range.begin(), __first + __range.end(), __local_histogram.begin());
-        });
-
-        tbb::parallel_for(tbb::blocked_range<_Size>(0, __num_bins), [&](const tbb::blocked_range<_Size>& __range) {
-            auto __local_histogram = __thread_local_histogram.begin();
-            __init(__local_histogram->begin() + __range.begin(), __range.size(), __histogram_first + __range.begin());
-            ++__local_histogram;
-            for (; __local_histogram != __thread_local_histogram.end(); ++__local_histogram)
-            {
-                __accum(__local_histogram->begin() + __range.begin(), __range.size(),
-                        __histogram_first + __range.begin());
-            }
-        });
-    });
-}
 
 } // namespace __tbb_backend
 } // namespace dpl