1 files changed, 65 insertions, 0 deletions
diff --git a/compiler/enco/core/src/Transforms/FreeInstrElimination.cpp b/compiler/enco/core/src/Transforms/FreeInstrElimination.cpp
new file mode 100644
index 000000000..a62324b28
--- /dev/null
+++ b/compiler/enco/core/src/Transforms/FreeInstrElimination.cpp
@@ -0,0 +1,65 @@
+/*
+ * 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 "FreeInstrElimination.h"
+
+#include <cassert>
+#include <set>
+
+namespace
+{
+
+/**
+ * @brief Return the set of "free" instructions in a given module
+ */
+std::set<coco::Instr *> free_instrs(const coco::Module *m)
+{
+  std::set<coco::Instr *> res;
+
+  for (uint32_t n = 0; n < m->entity()->instr()->size(); ++n)
+  {
+    if (auto ins = m->entity()->instr()->at(n))
+    {
+      if (ins->parent() == nullptr)
+      {
+        res.insert(ins);
+      }
+    }
+  }
+
+  return res;
+}
+
+void destroy(coco::Instr *ins)
+{
+  auto m = ins->module();
+  m->entity()->instr()->destroy(ins);
+}
+
+} // namespace
+
+namespace enco
+{
+
+void eliminate_free_instr(coco::Module *m)
+{
+  for (auto ins : free_instrs(m))
+  {
+    destroy(ins);
+  }
+}
+
+} // namespace enco