Move kernel pieces of cumsum/cumprod into unfied file.

src/ATen/native/xpu/sycl/CumprodKernel.cpp

@@ -21,4 +21,22 @@ void launch_cumprod_kernel(
       });
 }
 
+static c10::MaybeOwned<Tensor> contiguous_out_arg(const Tensor& tensor) {
+  if (tensor.is_contiguous()) {
+    return c10::MaybeOwned<Tensor>::borrowed(tensor);
+  }
+  return c10::MaybeOwned<Tensor>::owned(
+      at::empty(tensor.sizes(), tensor.options()));
+}
+
+void cumprod_kernel(const Tensor& result, const Tensor& self, int64_t dim) {
+  auto result_ = contiguous_out_arg(result);
+
+  launch_cumprod_kernel(*result_, self, dim);
+
+  if (!result.is_same(*result_)) {
+    result.copy_(*result_);
+  }
+}
+
 } // namespace at::native::xpu

src/ATen/native/xpu/sycl/CumsumKernel.cpp

@@ -21,4 +21,22 @@ void launch_cumsum_kernel(
       });
 }
 
+static c10::MaybeOwned<Tensor> contiguous_out_arg(const Tensor& tensor) {
+  if (tensor.is_contiguous()) {
+    return c10::MaybeOwned<Tensor>::borrowed(tensor);
+  }
+  return c10::MaybeOwned<Tensor>::owned(
+      at::empty(tensor.sizes(), tensor.options()));
+}
+
+void cumsum_kernel(const Tensor& result, const Tensor& self, int64_t dim) {
+  auto result_ = contiguous_out_arg(result);
+
+  launch_cumsum_kernel(*result_, self, dim);
+
+  if (!result.is_same(*result_)) {
+    result.copy_(*result_);
+  }
+}
+
 } // namespace at::native::xpu