Optimizing: Rename `HSelectGenerator`...

... to `HCodeFlowSimplifier` in preparation for adding
more optimizations to this pass.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: Icb05c3455d93a7b939f82ced9b08165e533bb21a

1 files changed, 0 insertions, 120 deletions

diff --git a/compiler/optimizing/select_generator.h b/compiler/optimizing/select_generator.h
deleted file mode 100644
index 7aa0803d89..0000000000
--- a/compiler/optimizing/select_generator.h
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * 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 patterns:
- *
- *          If [ Condition ]
- *            /          \
- *      false branch  true branch
- *            \          /
- *     Phi [FalseValue, TrueValue]
- *
- * and
- *
- *             If [ Condition ]
- *               /          \
- *     false branch        true branch
- *     return FalseValue   return 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.
- *
- * For the first pattern it simplifies to:
- *
- *              true branch
- *              false branch
- *              Select [FalseValue, TrueValue, Condition]
- *
- * For the second pattern it simplifies to:
- *
- *              true branch
- *              false branch
- *              return 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 "base/macros.h"
-#include "base/scoped_arena_containers.h"
-#include "optimization.h"
-#include "optimizing/nodes.h"
-
-namespace art HIDDEN {
-
-class HSelectGenerator : public HOptimization {
- public:
-  HSelectGenerator(HGraph* graph,
-                   OptimizingCompilerStats* stats,
-                   const char* name = kSelectGeneratorPassName);
-
-  bool Run() override;
-
-  static constexpr const char* kSelectGeneratorPassName = "select_generator";
-
- private:
-  bool TryGenerateSelectSimpleDiamondPattern(HBasicBlock* block,
-                                             ScopedArenaSafeMap<HInstruction*, HSelect*>* cache);
-
-  // When generating code for nested ternary operators (e.g. `return (x > 100) ? 100 : ((x < -100) ?
-  // -100 : x);`), a dexer can generate a double diamond pattern but it is not a clear cut one due
-  // to the merging of the blocks. `TryFixupDoubleDiamondPattern` recognizes that pattern and fixes
-  // up the graph to have a clean double diamond that `TryGenerateSelectSimpleDiamondPattern` can
-  // use to generate selects.
-  //
-  // In ASCII, it turns:
-  //
-  //      1 (outer if)
-  //     / \
-  //    2   3 (inner if)
-  //    |  / \
-  //    | 4  5
-  //     \/  |
-  //      6  |
-  //       \ |
-  //         7
-  //         |
-  //         8
-  // into:
-  //      1 (outer if)
-  //     / \
-  //    2   3 (inner if)
-  //    |  / \
-  //    | 4  5
-  //     \/ /
-  //      6
-  //      |
-  //      8
-  //
-  // In short, block 7 disappears and we merge 6 and 7. Now we have a diamond with {3,4,5,6}, and
-  // when that gets resolved we get another one with the outer if.
-  HBasicBlock* TryFixupDoubleDiamondPattern(HBasicBlock* block);
-
-  DISALLOW_COPY_AND_ASSIGN(HSelectGenerator);
-};
-
-}  // namespace art
-
-#endif  // ART_COMPILER_OPTIMIZING_SELECT_GENERATOR_H_