1 files changed, 105 insertions, 0 deletions
diff --git a/compiler/enco/core/src/Transforms/CopyLowering.cpp b/compiler/enco/core/src/Transforms/CopyLowering.cpp
new file mode 100644
index 000000000..ceb3bbd5c
--- /dev/null
+++ b/compiler/enco/core/src/Transforms/CopyLowering.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2018 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 "CopyLowering.h"
+
+#include <set>
+#include <cassert>
+
+//
+// Lower Copy as Shuffle
+//
+namespace enco
+{
+
+void lower_copy(enco::Code *code)
+{
+  auto m = code->module();
+
+  std::set<coco::Copy *> lowered_copies;
+
+  for (uint32_t n = 0; n < m->entity()->instr()->size(); ++n)
+  {
+    auto ins = m->entity()->instr()->at(n);
+
+    assert(ins != nullptr);
+
+    if (ins->parent() == nullptr)
+    {
+      // Skip if instruction does not belong to a list
+      continue;
+    }
+
+    auto copy = ins->asCopy();
+
+    if (copy == nullptr)
+    {
+      // Skip if instruction is not a copy
+      continue;
+    }
+
+    // TODO Support non-Feature objects
+    auto ifm = copy->from()->asFeature();
+    auto ofm = copy->into()->asFeature();
+
+    if ((ifm == nullptr) || (ofm == nullptr))
+    {
+      continue;
+    }
+
+    assert(ifm->layout()->batch() == ofm->layout()->batch());
+    assert(ifm->layout()->shape() == ofm->layout()->shape());
+
+    auto shuffle = m->entity()->instr()->create<coco::Shuffle>();
+
+    shuffle->from(ifm->bag());
+    shuffle->into(ofm->bag());
+
+    const uint32_t B = ifm->layout()->batch();
+    const uint32_t C = ifm->layout()->shape().depth();
+    const uint32_t H = ifm->layout()->shape().height();
+    const uint32_t W = ifm->layout()->shape().width();
+
+    for (uint32_t b = 0; b < B; ++b)
+    {
+      for (uint32_t ch = 0; ch < C; ++ch)
+      {
+        for (uint32_t row = 0; row < H; ++row)
+        {
+          for (uint32_t col = 0; col < W; ++col)
+          {
+            const auto from = ifm->layout()->at(b, ch, row, col);
+            const auto into = ofm->layout()->at(b, ch, row, col);
+
+            shuffle->insert(from, into);
+          }
+        }
+      }
+    }
+
+    shuffle->insertBefore(copy);
+    lowered_copies.insert(copy);
+  }
+
+  // Destroy lowered copy
+  for (const auto &copy : lowered_copies)
+  {
+    copy->detach();
+    m->entity()->instr()->destroy(copy);
+  }
+}
+
+} // namespace enco