Save functor type into typename to simplify invocation in parallel_for

dpctl/tensor/libtensor/include/kernels/clip.hpp

@@ -216,22 +216,26 @@ sycl::event clip_contig_impl(sycl::queue &q,
         {
             constexpr bool enable_sg_loadstore = true;
             using KernelName = clip_contig_kernel<T, vec_sz, n_vecs>;
+            using Impl =
+                ClipContigFunctor<T, vec_sz, n_vecs, enable_sg_loadstore>;
+            static_assert(sycl::is_device_copyable_v<Impl>);
 
             cgh.parallel_for<KernelName>(
                 sycl::nd_range<1>(gws_range, lws_range),
-                ClipContigFunctor<T, vec_sz, n_vecs, enable_sg_loadstore>(
-                    nelems, x_tp, min_tp, max_tp, dst_tp));
+                Impl(nelems, x_tp, min_tp, max_tp, dst_tp));
         }
         else {
             constexpr bool disable_sg_loadstore = false;
             using InnerKernelName = clip_contig_kernel<T, vec_sz, n_vecs>;
             using KernelName =
                 disabled_sg_loadstore_wrapper_krn<InnerKernelName>;
+            using Impl =
+                ClipContigFunctor<T, vec_sz, n_vecs, disable_sg_loadstore>;
+            static_assert(sycl::is_device_copyable_v<Impl>);
 
             cgh.parallel_for<KernelName>(
                 sycl::nd_range<1>(gws_range, lws_range),
-                ClipContigFunctor<T, vec_sz, n_vecs, disable_sg_loadstore>(
-                    nelems, x_tp, min_tp, max_tp, dst_tp));
+                Impl(nelems, x_tp, min_tp, max_tp, dst_tp));
         }
     });
 
@@ -311,10 +315,12 @@ sycl::event clip_strided_impl(sycl::queue &q,
         const FourOffsets_StridedIndexer indexer{
             nd, x_offset, min_offset, max_offset, dst_offset, shape_strides};
 
-        cgh.parallel_for<clip_strided_kernel<T, FourOffsets_StridedIndexer>>(
+        using KernelName = clip_strided_kernel<T, FourOffsets_StridedIndexer>;
+        using Impl = ClipStridedFunctor<T, FourOffsets_StridedIndexer>;
+
+        cgh.parallel_for<KernelName>(
             sycl::range<1>(nelems),
-            ClipStridedFunctor<T, FourOffsets_StridedIndexer>(
-                x_tp, min_tp, max_tp, dst_tp, indexer));
+            Impl(x_tp, min_tp, max_tp, dst_tp, indexer));
     });
 
     return clip_ev;

dpctl/tensor/libtensor/include/kernels/constructors.hpp

@@ -24,13 +24,15 @@
 //===----------------------------------------------------------------------===//
 
 #pragma once
+#include <complex>
+#include <cstddef>
+
+#include <sycl/sycl.hpp>
+
 #include "dpctl_tensor_types.hpp"
 #include "utils/offset_utils.hpp"
 #include "utils/strided_iters.hpp"
 #include "utils/type_utils.hpp"
-#include <complex>
-#include <cstddef>
-#include <sycl/sycl.hpp>
 
 namespace dpctl
 {
@@ -200,22 +202,25 @@ sycl::event lin_space_affine_impl(sycl::queue &exec_q,
 {
     dpctl::tensor::type_utils::validate_type_for_device<Ty>(exec_q);
 
-    bool device_supports_doubles = exec_q.get_device().has(sycl::aspect::fp64);
+    const bool device_supports_doubles =
+        exec_q.get_device().has(sycl::aspect::fp64);
+    const std::size_t den = (include_endpoint) ? nelems - 1 : nelems;
+
     sycl::event lin_space_affine_event = exec_q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(depends);
         if (device_supports_doubles) {
-            cgh.parallel_for<linear_sequence_affine_kernel<Ty, double>>(
-                sycl::range<1>{nelems},
-                LinearSequenceAffineFunctor<Ty, double>(
-                    array_data, start_v, end_v,
-                    (include_endpoint) ? nelems - 1 : nelems));
+            using KernelName = linear_sequence_affine_kernel<Ty, double>;
+            using Impl = LinearSequenceAffineFunctor<Ty, double>;
+
+            cgh.parallel_for<KernelName>(sycl::range<1>{nelems},
+                                         Impl(array_data, start_v, end_v, den));
         }
         else {
-            cgh.parallel_for<linear_sequence_affine_kernel<Ty, float>>(
-                sycl::range<1>{nelems},
-                LinearSequenceAffineFunctor<Ty, float>(
-                    array_data, start_v, end_v,
-                    (include_endpoint) ? nelems - 1 : nelems));
+            using KernelName = linear_sequence_affine_kernel<Ty, float>;
+            using Impl = LinearSequenceAffineFunctor<Ty, float>;
+
+            cgh.parallel_for<KernelName>(sycl::range<1>{nelems},
+                                         Impl(array_data, start_v, end_v, den));
         }
     });
 
@@ -312,10 +317,12 @@ sycl::event full_strided_impl(sycl::queue &q,
 
     sycl::event fill_ev = q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(depends);
-        cgh.parallel_for<full_strided_kernel<dstTy>>(
-            sycl::range<1>{nelems},
-            FullStridedFunctor<dstTy, decltype(strided_indexer)>(
-                dst_tp, fill_v, strided_indexer));
+
+        using KernelName = full_strided_kernel<dstTy>;
+        using Impl = FullStridedFunctor<dstTy, StridedIndexer>;
+
+        cgh.parallel_for<KernelName>(sycl::range<1>{nelems},
+                                     Impl(dst_tp, fill_v, strided_indexer));
     });
 
     return fill_ev;
@@ -388,9 +395,12 @@ sycl::event eye_impl(sycl::queue &exec_q,
     dpctl::tensor::type_utils::validate_type_for_device<Ty>(exec_q);
     sycl::event eye_event = exec_q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(depends);
-        cgh.parallel_for<eye_kernel<Ty>>(
-            sycl::range<1>{nelems},
-            EyeFunctor<Ty>(array_data, start, end, step));
+
+        using KernelName = eye_kernel<Ty>;
+        using Impl = EyeFunctor<Ty>;
+
+        cgh.parallel_for<KernelName>(sycl::range<1>{nelems},
+                                     Impl(array_data, start, end, step));
     });
 
     return eye_event;
@@ -478,7 +488,7 @@ sycl::event tri_impl(sycl::queue &exec_q,
                 ssize_t inner_gid = idx[0] - inner_range * outer_gid;
 
                 ssize_t src_inner_offset = 0, dst_inner_offset = 0;
-                bool to_copy(true);
+                bool to_copy{false};
 
                 {
                     using dpctl::tensor::strides::CIndexer_array;