upload android base code part3

android/art/compiler/optimizing/select_generator.h

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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*
+ * This optimization recognizes the common diamond selection pattern and
+ * replaces it with an instance of the HSelect instruction.
+ *
+ * Recognized pattern:
+ *
+ *          If [ Condition ]
+ *            /          \
+ *      false branch  true branch
+ *            \          /
+ *     Phi [FalseValue, TrueValue]
+ *
+ * The pattern will be simplified if `true_branch` and `false_branch` each
+ * contain at most one instruction without any side effects.
+ *
+ * Blocks are merged into one and Select replaces the If and the Phi:
+ *              true branch
+ *              false branch
+ *              Select [FalseValue, TrueValue, Condition]
+ *
+ * Note: In order to recognize no side-effect blocks, this optimization must be
+ * run after the instruction simplifier has removed redundant suspend checks.
+ */
+
+#ifndef ART_COMPILER_OPTIMIZING_SELECT_GENERATOR_H_
+#define ART_COMPILER_OPTIMIZING_SELECT_GENERATOR_H_
+
+#include "optimization.h"
+
+namespace art {
+
+class HSelectGenerator : public HOptimization {
+ public:
+  HSelectGenerator(HGraph* graph, OptimizingCompilerStats* stats)
+    : HOptimization(graph, kSelectGeneratorPassName, stats) {}
+
+  void Run() OVERRIDE;
+
+  static constexpr const char* kSelectGeneratorPassName = "select_generator";
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HSelectGenerator);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_OPTIMIZING_SELECT_GENERATOR_H_