From cb0a615ad2d483a05235776028c97296a98a388d Mon Sep 17 00:00:00 2001
From: =?utf8?q?=EB=B0=95=EC=A2=85=ED=98=84/=EB=8F=99=EC=9E=91=EC=A0=9C?=
 =?utf8?q?=EC=96=B4Lab=28SR=29/Staff=20Engineer/=EC=82=BC=EC=84=B1?=
 =?utf8?q?=EC=A0=84=EC=9E=90?= <jh1302.park@samsung.com>
Date: Fri, 31 Aug 2018 17:35:24 +0900
Subject: [PATCH] [coco] Add ReLU operator (#1272)

This commit introduces ReLU op class which denotes a ReLU op in coco IR.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>
---
 contrib/coco/core/include/coco/IR/Op.lst |  1 +
 contrib/coco/core/include/coco/IR/ReLU.h | 37 +++++++++++++++++
 contrib/coco/core/src/IR/ReLU.cpp        | 18 ++++++++
 contrib/coco/core/src/IR/ReLU.test.cpp   | 70 ++++++++++++++++++++++++++++++++
 4 files changed, 126 insertions(+)
 create mode 100644 contrib/coco/core/include/coco/IR/ReLU.h
 create mode 100644 contrib/coco/core/src/IR/ReLU.cpp
 create mode 100644 contrib/coco/core/src/IR/ReLU.test.cpp

diff --git a/contrib/coco/core/include/coco/IR/Op.lst b/contrib/coco/core/include/coco/IR/Op.lst
index 0262e78..5724964 100644
--- a/contrib/coco/core/include/coco/IR/Op.lst
+++ b/contrib/coco/core/include/coco/IR/Op.lst
@@ -5,3 +5,4 @@
 // OP(Name)
 
 OP(Conv2D)
+OP(ReLU)
diff --git a/contrib/coco/core/include/coco/IR/ReLU.h b/contrib/coco/core/include/coco/IR/ReLU.h
new file mode 100644
index 0000000..5dc3da7
--- /dev/null
+++ b/contrib/coco/core/include/coco/IR/ReLU.h
@@ -0,0 +1,37 @@
+#ifndef __COCO_IR_RELU_H__
+#define __COCO_IR_RELU_H__
+
+#include "coco/IR/Op.h"
+
+namespace coco
+{
+
+/**
+ * @brief Apply ReLU over elements
+ */
+class ReLU : public Op
+{
+public:
+  explicit ReLU(const PtrLink<Op, Instr> *);
+
+public:
+  ReLU(const ReLU &) = delete;
+  ReLU(ReLU &&) = delete;
+
+public:
+  std::set<Object *> uses(void) const override;
+
+public:
+  ReLU *asReLU(void) override { return this; }
+  const ReLU *asReLU(void) const override { return this; }
+
+private:
+  void get(const PtrLink<Op, Instr> **out) const override { *out = _op_link; }
+
+private:
+  const PtrLink<Op, Instr> *const _op_link;
+};
+
+} // namespace coco
+
+#endif // __COCO_IR_RELU_H__
diff --git a/contrib/coco/core/src/IR/ReLU.cpp b/contrib/coco/core/src/IR/ReLU.cpp
new file mode 100644
index 0000000..b280c14
--- /dev/null
+++ b/contrib/coco/core/src/IR/ReLU.cpp
@@ -0,0 +1,18 @@
+#include "coco/IR/ReLU.h"
+
+namespace coco
+{
+
+ReLU::ReLU(const PtrLink<Op, Instr> *op_link) : _op_link{op_link}
+{
+  // DO NOTHING
+}
+
+std::set<Object *> ReLU::uses(void) const
+{
+  // NOTE ReLU accesses no object
+  std::set<Object *> res;
+  return res;
+}
+
+} // namespace coco
diff --git a/contrib/coco/core/src/IR/ReLU.test.cpp b/contrib/coco/core/src/IR/ReLU.test.cpp
new file mode 100644
index 0000000..07a83ae
--- /dev/null
+++ b/contrib/coco/core/src/IR/ReLU.test.cpp
@@ -0,0 +1,70 @@
+#include "coco/IR/ReLU.h"
+
+#include <memory>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+namespace
+{
+struct IsReLU : public coco::Op::DefaultVisitor<bool>
+{
+  bool visit(const coco::ReLU *) override { return true; }
+};
+
+class ReLUTest : public ::testing::Test
+{
+public:
+  ReLUTest()
+  {
+    // DO NOTHING
+  }
+
+protected:
+  coco::ReLU *allocate(void)
+  {
+    auto op = new coco::ReLU{&op_link};
+    _allocated.emplace_back(op);
+    return op;
+  }
+
+protected:
+  coco::PtrLink<coco::Op, coco::Instr> op_link;
+
+private:
+  std::vector<std::unique_ptr<coco::ReLU>> _allocated;
+};
+} // namespace
+
+TEST_F(ReLUTest, initialization)
+{
+  auto op = allocate();
+
+  // uses() should be empty on construction
+  ASSERT_EQ(op->uses().size(), 0);
+  // parent() should be nullptr on construction
+  ASSERT_EQ(op->parent(), nullptr);
+}
+
+TEST_F(ReLUTest, asReLU)
+{
+  auto op = allocate();
+
+  coco::Op *mutable_base = op;
+  const coco::Op *immutable_base = op;
+
+  ASSERT_EQ(mutable_base->asReLU(), op);
+  ASSERT_EQ(mutable_base->asReLU(), immutable_base->asReLU());
+}
+
+TEST_F(ReLUTest, accept)
+{
+  // Test 'ReLU' class
+  auto op = allocate();
+
+  coco::ReLU *mutable_ptr = op;
+  const coco::ReLU *immutable_ptr = op;
+
+  ASSERT_TRUE(mutable_ptr->accept(IsReLU{}));
+  ASSERT_TRUE(immutable_ptr->accept(IsReLU{}));
+}
-- 
2.7.4