1 files changed, 84 insertions, 0 deletions
diff --git a/compiler/angkor/src/ADT/kernel/IndexEnumerator.cpp b/compiler/angkor/src/ADT/kernel/IndexEnumerator.cpp
new file mode 100644
index 000000000..0b1db090d
--- /dev/null
+++ b/compiler/angkor/src/ADT/kernel/IndexEnumerator.cpp
@@ -0,0 +1,84 @@
+/*
+ * 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 "nncc/core/ADT/kernel/IndexEnumerator.h"
+
+#include <cassert>
+#include <algorithm>
+
+namespace nncc
+{
+namespace core
+{
+namespace ADT
+{
+namespace kernel
+{
+
+IndexEnumerator::IndexEnumerator(const Shape &shape) : _cursor(0)
+{
+  _max[0] = shape.width();
+  _max[1] = shape.height();
+  _max[2] = shape.depth();
+  _max[3] = shape.count();
+
+  std::fill(_cur, _cur + 4, 0);
+
+  // NOTE Null dimension should NOT exist
+  assert(std::find(_max, _max + 4, 0) == (_max + 4));
+}
+
+bool IndexEnumerator::valid(void) const { return _cursor < 4; }
+
+uint32_t IndexEnumerator::count(void) const { return _cur[3]; }
+uint32_t IndexEnumerator::depth(void) const { return _cur[2]; }
+uint32_t IndexEnumerator::height(void) const { return _cur[1]; }
+uint32_t IndexEnumerator::width(void) const { return _cur[0]; }
+
+void IndexEnumerator::advance(void)
+{
+  while (_cursor < 4)
+  {
+    if (_cur[_cursor] + 1 < _max[_cursor])
+    {
+      break;
+    }
+
+    ++_cursor;
+  }
+
+  if (_cursor == 4)
+  {
+    return;
+  }
+
+  // Increment index
+  _cur[_cursor] += 1;
+
+  // Reset indices for lower dimensions
+  for (uint32_t head = 0; head < _cursor; ++head)
+  {
+    _cur[head] = 0;
+  }
+
+  // Reset cursor
+  _cursor = 0;
+}
+
+} // namespace kernel
+} // namespace ADT
+} // namespace core
+} // namespace nncc