Remove free function __stride_recommender

Signed-off-by: Matthew Michel <[email protected]>

include/oneapi/dpl/pstl/hetero/dpcpp/parallel_backend_sycl_utils.h

@@ -834,39 +834,6 @@ class __static_monotonic_dispatcher<::std::integer_sequence<::std::uint16_t, _X,
     }
 };
 
-// Utility to recommend a stride for the best-performing memory access pattern from empirical testing on different
-// devices. This utility can only be called from the device.
-//
-// SPIR-V compilation targets show best performance with a stride of the sub-group size.
-// Other compilation targets perform best with a work-group size stride.
-inline std::tuple<std::size_t, std::size_t, bool>
-__stride_recommender(const sycl::nd_item<1>& __item, std::size_t __count, std::size_t __iters_per_work_item,
-                     std::size_t __work_group_size)
-{
-    if constexpr (oneapi::dpl::__internal::__is_spirv_target_v)
-    {
-        const __dpl_sycl::__sub_group __sub_group = __item.get_sub_group();
-        const std::uint32_t __sub_group_size = __sub_group.get_local_linear_range();
-        const std::uint32_t __sub_group_id = __sub_group.get_group_linear_id();
-        const std::uint32_t __sub_group_local_id = __sub_group.get_local_linear_id();
-        const std::size_t __work_group_id = __item.get_group().get_group_linear_id();
-
-        const std::size_t __sub_group_start_idx =
-            __iters_per_work_item * (__work_group_id * __work_group_size + __sub_group_size * __sub_group_id);
-        const bool __is_full_sub_group = __sub_group_start_idx + __iters_per_work_item * __sub_group_size <= __count;
-        const std::size_t __work_item_idx = __sub_group_start_idx + __sub_group_local_id;
-        return std::make_tuple(__work_item_idx, __sub_group_size, __is_full_sub_group);
-    }
-    else
-    {
-        const std::size_t __work_group_start_idx =
-            __item.get_group().get_group_linear_id() * __work_group_size * __iters_per_work_item;
-        const std::size_t __work_item_idx = __work_group_start_idx + __item.get_local_linear_id();
-        const bool __is_full_work_group = __work_group_start_idx + __iters_per_work_item * __work_group_size <= __count;
-        return std::make_tuple(__work_item_idx, __work_group_size, __is_full_work_group);
-    }
-}
-
 } // namespace __par_backend_hetero
 } // namespace dpl
 } // namespace oneapi