chore: import upstream snapshot with attribution

libnd4j/include/helpers/impl/CudaLaunchHelper.cpp

@@ -0,0 +1,35 @@
+/* ******************************************************************************
+ *
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ *  See the NOTICE file distributed with this work for additional
+ *  information regarding copyright ownership.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ ******************************************************************************/
+
+//
+// Created by raver on 4/5/2018.
+//
+#include <helpers/CudaLaunchHelper.h>
+#include <math/templatemath.h>
+
+namespace sd {
+
+int CudaLaunchHelper::getReductionBlocks(LongType xLength, int blockSize) {
+  int div = xLength / blockSize;
+  int can = sd::math::sd_max<int>(div, 1);
+  if (xLength % blockSize != 0 && xLength > blockSize) can++;
+
+  // not more then 512 blocks
+  return sd::math::sd_min<int>(can, 512);
+}
+}  // namespace sd