1 files changed, 138 insertions, 0 deletions
diff --git a/compiler/luci/pass/src/BatchNormPatternFinder.cpp b/compiler/luci/pass/src/BatchNormPatternFinder.cpp
new file mode 100644
index 000000000..e3f126b15
--- /dev/null
+++ b/compiler/luci/pass/src/BatchNormPatternFinder.cpp
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2021 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 "BatchNormPatternFinder.h"
+
+#include <luci/IR/CircleNodes.h>
+
+namespace luci
+{
+
+bool is_batchnorm_add(const luci::CircleAdd *add, luci::CircleMul *&mul, luci::CircleConst *&beta)
+{
+  auto x = loco::must_cast<luci::CircleNode *>(add->x());
+  auto y = loco::must_cast<luci::CircleNode *>(add->y());
+
+  luci::CircleMul *pred = nullptr;
+  luci::CircleConst *constant = nullptr;
+
+  if (x->opcode() == luci::CircleOpcode::CIRCLECONST && y->opcode() == luci::CircleOpcode::MUL)
+  {
+    pred = loco::must_cast<luci::CircleMul *>(y);
+    constant = loco::must_cast<luci::CircleConst *>(x);
+  }
+  else if (x->opcode() == luci::CircleOpcode::MUL && y->opcode() == luci::CircleOpcode::CIRCLECONST)
+  {
+    pred = loco::must_cast<luci::CircleMul *>(x);
+    constant = loco::must_cast<luci::CircleConst *>(y);
+  }
+  else
+  {
+    return false;
+  }
+
+  uint32_t channel_dim = 0;
+
+  if (constant->rank() == 1)
+  {
+    channel_dim = constant->dim(0).value();
+  }
+  else if (constant->rank() == 4)
+  {
+    for (uint32_t i = 0; i < 3; i++)
+    {
+      if (constant->dim(i).value() != 1)
+        return false;
+    }
+    channel_dim = constant->dim(3).value();
+  }
+  else
+  {
+    return false;
+  }
+
+  // Assumption: Layout is channel-last
+  if (!(channel_dim == add->dim(add->rank() - 1)))
+    return false;
+
+  mul = pred;
+  beta = constant;
+  return true;
+}
+
+bool is_batchnorm_add(const luci::CircleAdd *add)
+{
+  // for dummy mul and beta
+  luci::CircleMul *mul = nullptr;
+  luci::CircleConst *beta = nullptr;
+
+  return is_batchnorm_add(add, mul, beta);
+}
+
+bool is_batchnorm_mul(const luci::CircleMul *mul, luci::CircleNode *&pred_node,
+                      luci::CircleConst *&gamma)
+{
+  auto x = dynamic_cast<luci::CircleConst *>(mul->x());
+  auto y = dynamic_cast<luci::CircleConst *>(mul->y());
+
+  luci::CircleNode *pred = nullptr;
+  luci::CircleConst *constant = nullptr;
+
+  if (x != nullptr && y == nullptr)
+  {
+    pred = loco::must_cast<luci::CircleNode *>(mul->y());
+    constant = x;
+  }
+  else if (x == nullptr && y != nullptr)
+  {
+    pred = loco::must_cast<luci::CircleNode *>(mul->x());
+    constant = y;
+  }
+  else
+  {
+    return false;
+  }
+
+  uint32_t channel_dim = 0;
+
+  if (constant->rank() == 1)
+  {
+    channel_dim = constant->dim(0).value();
+  }
+  else if (constant->rank() == 4)
+  {
+    for (uint32_t i = 0; i < 3; i++)
+    {
+      if (constant->dim(i).value() != 1)
+        return false;
+    }
+    channel_dim = constant->dim(3).value();
+  }
+  else
+  {
+    return false;
+  }
+
+  // Assumption: Layout is channel-last
+  if (!(channel_dim == mul->dim(mul->rank() - 1)))
+    return false;
+
+  pred_node = pred;
+  gamma = constant;
+  return true;
+}
+
+} // namespace luci