1 files changed, 92 insertions, 0 deletions
diff --git a/runtimes/libs/ARMComputeEx/src/runtime/misc/functions/GenericGather.cpp b/runtimes/libs/ARMComputeEx/src/runtime/misc/functions/GenericGather.cpp
new file mode 100644
index 000000000..67e1bfb02
--- /dev/null
+++ b/runtimes/libs/ARMComputeEx/src/runtime/misc/functions/GenericGather.cpp
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+#include "arm_compute/runtime/misc/functions/GenericGather.h"
+
+namespace arm_compute
+{
+namespace misc
+{
+
+bool shouldPermute(arm_compute::ITensorInfo *input, arm_compute::ITensorInfo *output)
+{
+  return (input->num_dimensions() != 4 && output->num_dimensions() == 4 &&
+          input->data_layout() == DataLayout::NCHW);
+}
+
+void GenericGather::configure(arm_compute::ITensor *input, arm_compute::ITensor *indices,
+                              arm_compute::ITensor *output, int axis)
+{
+  _input = input;
+  _indices = indices;
+  _output = output;
+  _axis = axis;
+
+  arm_compute::PermutationVector pv;
+  if (shouldPermute(input->info(), output->info()))
+  {
+    // NOTE This vector comes from CLPermuteKernel implementation
+    //
+    // This implementation permutes a tensor of shape C / W / H into another tensor of shape W / H /
+    // C
+    //
+    //     Original | Permuted
+    // 0 | C        | W (from 1)
+    // 1 | W        | H (from 2)
+    // 2 | H        | C (from 0)
+    //
+    pv = arm_compute::PermutationVector{1, 2, 0};
+  }
+
+  if (utils::isGpuMode())
+  {
+    if (shouldPermute(input->info(), output->info()))
+    {
+      _cl_gather.configure(CAST_CL(input), CAST_CL(indices), &_cl_permuted, axis);
+      _cl_permute.configure(&_cl_permuted, CAST_CL(output), pv);
+
+      // NOTE _permuted is inaccessible from outside, and thus it is safe to invoke allocate here.
+      _cl_permuted.allocator()->allocate();
+    }
+    else
+    {
+      _cl_gather.configure(CAST_CL(input), CAST_CL(indices), CAST_CL(output), axis);
+    }
+  }
+  else
+  {
+    throw std::runtime_error("Not supported, yet");
+  }
+}
+
+void GenericGather::run(void)
+{
+  if (utils::isGpuMode())
+  {
+    _cl_gather.run();
+    if (shouldPermute(_input->info(), _output->info()))
+    {
+      _cl_permute.run();
+    }
+  }
+  else
+  {
+    throw std::runtime_error("Not supported, yet");
+  }
+}
+
+} // namespace misc
+} // namespace arm_compute