[turbofan] Fix RedundancyElimination and add more test coverage.

Make the RedundancyElimination handle all simplified operators that are
listed in the SIMPLIFIED_CHECKED_OP_LIST, and fix a couple of bugs and
oversights in the code. This also adds a lot of test coverage for all
the cases that we care about in RedundancyElimination (with respect to
Check/Checked simplified operators).

Bug: v8:8015
Change-Id: I57d29113389841b09abcd013313bf5dd1c67735f
Reviewed-on: https://chromium-review.googlesource.com/1233655Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56032}

src/compiler/redundancy-elimination.cc

@@ -32,23 +32,9 @@ Reduction RedundancyElimination::Reduce(Node* node) {
     case IrOpcode::kCheckSmi:
     case IrOpcode::kCheckString:
     case IrOpcode::kCheckSymbol:
-    case IrOpcode::kCheckedFloat64ToInt32:
-    case IrOpcode::kCheckedInt32Add:
-    case IrOpcode::kCheckedInt32Div:
-    case IrOpcode::kCheckedInt32Mod:
-    case IrOpcode::kCheckedInt32Mul:
-    case IrOpcode::kCheckedInt32Sub:
-    case IrOpcode::kCheckedInt32ToTaggedSigned:
-    case IrOpcode::kCheckedTaggedSignedToInt32:
-    case IrOpcode::kCheckedTaggedToFloat64:
-    case IrOpcode::kCheckedTaggedToInt32:
-    case IrOpcode::kCheckedTaggedToTaggedPointer:
-    case IrOpcode::kCheckedTaggedToTaggedSigned:
-    case IrOpcode::kCheckedTruncateTaggedToWord32:
-    case IrOpcode::kCheckedUint32Div:
-    case IrOpcode::kCheckedUint32Mod:
-    case IrOpcode::kCheckedUint32ToInt32:
-    case IrOpcode::kCheckedUint32ToTaggedSigned:
+#define SIMPLIFIED_CHECKED_OP(Opcode) case IrOpcode::k##Opcode:
+      SIMPLIFIED_CHECKED_OP_LIST(SIMPLIFIED_CHECKED_OP)
+#undef SIMPLIFIED_CHECKED_OP
       return ReduceCheckNode(node);
     case IrOpcode::kSpeculativeNumberAdd:
     case IrOpcode::kSpeculativeNumberSubtract:
@@ -140,6 +126,12 @@ bool CheckSubsumes(Node const* a, Node const* b) {
     if (a->opcode() == IrOpcode::kCheckInternalizedString &&
         b->opcode() == IrOpcode::kCheckString) {
       // CheckInternalizedString(node) implies CheckString(node)
+    } else if (a->opcode() == IrOpcode::kCheckSmi &&
+               b->opcode() == IrOpcode::kCheckNumber) {
+      // CheckSmi(node) implies CheckNumber(node)
+    } else if (a->opcode() == IrOpcode::kCheckedTaggedSignedToInt32 &&
+               b->opcode() == IrOpcode::kCheckedTaggedToInt32) {
+      // CheckedTaggedSignedToInt32(node) implies CheckedTaggedToInt32(node)
     } else if (a->opcode() != b->opcode()) {
       return false;
     } else {
@@ -150,11 +142,15 @@ bool CheckSubsumes(Node const* a, Node const* b) {
         case IrOpcode::kCheckNumber:
           break;
         case IrOpcode::kCheckedInt32ToTaggedSigned:
+        case IrOpcode::kCheckedInt64ToInt32:
+        case IrOpcode::kCheckedInt64ToTaggedSigned:
         case IrOpcode::kCheckedTaggedSignedToInt32:
         case IrOpcode::kCheckedTaggedToTaggedPointer:
         case IrOpcode::kCheckedTaggedToTaggedSigned:
         case IrOpcode::kCheckedUint32ToInt32:
         case IrOpcode::kCheckedUint32ToTaggedSigned:
+        case IrOpcode::kCheckedUint64ToInt32:
+        case IrOpcode::kCheckedUint64ToTaggedSigned:
           break;
         case IrOpcode::kCheckedFloat64ToInt32:
         case IrOpcode::kCheckedTaggedToInt32: {
@@ -167,6 +163,20 @@ bool CheckSubsumes(Node const* a, Node const* b) {
           }
           break;
         }
+        case IrOpcode::kCheckedTaggedToFloat64:
+        case IrOpcode::kCheckedTruncateTaggedToWord32: {
+          CheckTaggedInputParameters const& ap =
+              CheckTaggedInputParametersOf(a->op());
+          CheckTaggedInputParameters const& bp =
+              CheckTaggedInputParametersOf(b->op());
+          // {a} subsumes {b} if the modes are either the same, or {a} checks
+          // for Number, in which case {b} will be subsumed no matter what.
+          if (ap.mode() != bp.mode() &&
+              ap.mode() != CheckTaggedInputMode::kNumber) {
+            return false;
+          }
+          break;
+        }
         default:
           DCHECK(!IsCheckedWithFeedback(a->op()));
           return false;

src/compiler/redundancy-elimination.h

@@ -11,7 +11,7 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-class RedundancyElimination final : public AdvancedReducer {
+class V8_EXPORT_PRIVATE RedundancyElimination final : public AdvancedReducer {
  public:
   RedundancyElimination(Editor* editor, Zone* zone);
   ~RedundancyElimination() final;

src/compiler/simplified-operator.h

@@ -228,7 +228,7 @@ enum class CheckTaggedInputMode : uint8_t {
 
 size_t hash_value(CheckTaggedInputMode);
 
-std::ostream& operator<<(std::ostream&, CheckTaggedInputMode);
+V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, CheckTaggedInputMode);
 
 class CheckTaggedInputParameters {
  public:

src/vector-slot-pair.h

@@ -40,7 +40,8 @@ class V8_EXPORT_PRIVATE VectorSlotPair {
 bool operator==(VectorSlotPair const&, VectorSlotPair const&);
 bool operator!=(VectorSlotPair const&, VectorSlotPair const&);
 
-std::ostream& operator<<(std::ostream& os, VectorSlotPair const&);
+V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
+                                           VectorSlotPair const&);
 
 size_t hash_value(VectorSlotPair const&);
 

test/unittests/BUILD.gn

@@ -131,6 +131,7 @@ v8_source_set("unittests_sources") {
     "compiler/node-unittest.cc",
     "compiler/opcodes-unittest.cc",
     "compiler/persistent-unittest.cc",
+    "compiler/redundancy-elimination-unittest.cc",
     "compiler/regalloc/live-range-unittest.cc",
     "compiler/regalloc/move-optimizer-unittest.cc",
     "compiler/regalloc/register-allocator-unittest.cc",

test/unittests/compiler/redundancy-elimination-unittest.cc

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/compiler/redundancy-elimination.h"
+#include "src/compiler/common-operator.h"
+#include "test/unittests/compiler/graph-reducer-unittest.h"
+#include "test/unittests/compiler/graph-unittest.h"
+#include "test/unittests/compiler/node-test-utils.h"
+#include "testing/gmock-support.h"
+
+using testing::NiceMock;
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+namespace redundancy_elimination_unittest {
+
+class RedundancyEliminationTest : public GraphTest {
+ public:
+  explicit RedundancyEliminationTest(int num_parameters = 4)
+      : GraphTest(num_parameters),
+        reducer_(&editor_, zone()),
+        simplified_(zone()) {
+    // Initialize the {reducer_} state for the Start node.
+    reducer_.Reduce(graph()->start());
+
+    // Create a feedback vector with two CALL_IC slots.
+    FeedbackVectorSpec spec(zone());
+    FeedbackSlot slot1 = spec.AddCallICSlot();
+    FeedbackSlot slot2 = spec.AddCallICSlot();
+    Handle<FeedbackMetadata> metadata = FeedbackMetadata::New(isolate(), &spec);
+    Handle<SharedFunctionInfo> shared =
+        isolate()->factory()->NewSharedFunctionInfoForBuiltin(
+            isolate()->factory()->empty_string(), Builtins::kIllegal);
+    shared->set_raw_outer_scope_info_or_feedback_metadata(*metadata);
+    Handle<FeedbackVector> feedback_vector =
+        FeedbackVector::New(isolate(), shared);
+    vector_slot_pairs_.push_back(VectorSlotPair());
+    vector_slot_pairs_.push_back(
+        VectorSlotPair(feedback_vector, slot1, UNINITIALIZED));
+    vector_slot_pairs_.push_back(
+        VectorSlotPair(feedback_vector, slot2, UNINITIALIZED));
+  }
+  ~RedundancyEliminationTest() override = default;
+
+ protected:
+  Reduction Reduce(Node* node) { return reducer_.Reduce(node); }
+
+  std::vector<VectorSlotPair> const& vector_slot_pairs() const {
+    return vector_slot_pairs_;
+  }
+  SimplifiedOperatorBuilder* simplified() { return &simplified_; }
+
+ private:
+  NiceMock<MockAdvancedReducerEditor> editor_;
+  std::vector<VectorSlotPair> vector_slot_pairs_;
+  VectorSlotPair feedback2_;
+  RedundancyElimination reducer_;
+  SimplifiedOperatorBuilder simplified_;
+};
+
+namespace {
+
+const CheckForMinusZeroMode kCheckForMinusZeroModes[] = {
+    CheckForMinusZeroMode::kCheckForMinusZero,
+    CheckForMinusZeroMode::kDontCheckForMinusZero,
+};
+
+const CheckTaggedInputMode kCheckTaggedInputModes[] = {
+    CheckTaggedInputMode::kNumber, CheckTaggedInputMode::kNumberOrOddball};
+
+}  // namespace
+
+// -----------------------------------------------------------------------------
+// CheckBounds
+
+TEST_F(RedundancyEliminationTest, CheckBounds) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* index = Parameter(0);
+      Node* length = Parameter(1);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect = graph()->NewNode(
+          simplified()->CheckBounds(feedback1), index, length, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckBounds(feedback2), index, length, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckNumber
+
+TEST_F(RedundancyEliminationTest, CheckNumberSubsumedByCheckSmi) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect = graph()->NewNode(
+          simplified()->CheckSmi(feedback1), value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckNumber(feedback2), value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckString
+
+TEST_F(RedundancyEliminationTest,
+       CheckStringSubsumedByCheckInternalizedString) {
+  TRACED_FOREACH(VectorSlotPair, feedback, vector_slot_pairs()) {
+    Node* value = Parameter(0);
+    Node* effect = graph()->start();
+    Node* control = graph()->start();
+
+    Node* check1 = effect = graph()->NewNode(
+        simplified()->CheckInternalizedString(), value, effect, control);
+    Reduction r1 = Reduce(check1);
+    ASSERT_TRUE(r1.Changed());
+    EXPECT_EQ(r1.replacement(), check1);
+
+    Node* check2 = effect = graph()->NewNode(
+        simplified()->CheckString(feedback), value, effect, control);
+    Reduction r2 = Reduce(check2);
+    ASSERT_TRUE(r2.Changed());
+    EXPECT_EQ(r2.replacement(), check1);
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckSymbol
+
+TEST_F(RedundancyEliminationTest, CheckSymbol) {
+  Node* value = Parameter(0);
+  Node* effect = graph()->start();
+  Node* control = graph()->start();
+
+  Node* check1 = effect =
+      graph()->NewNode(simplified()->CheckSymbol(), value, effect, control);
+  Reduction r1 = Reduce(check1);
+  ASSERT_TRUE(r1.Changed());
+  EXPECT_EQ(r1.replacement(), check1);
+
+  Node* check2 = effect =
+      graph()->NewNode(simplified()->CheckSymbol(), value, effect, control);
+  Reduction r2 = Reduce(check2);
+  ASSERT_TRUE(r2.Changed());
+  EXPECT_EQ(r2.replacement(), check1);
+}
+
+// -----------------------------------------------------------------------------
+// CheckedFloat64ToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedFloat64ToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      TRACED_FOREACH(CheckForMinusZeroMode, mode, kCheckForMinusZeroModes) {
+        Node* value = Parameter(0);
+        Node* effect = graph()->start();
+        Node* control = graph()->start();
+
+        Node* check1 = effect = graph()->NewNode(
+            simplified()->CheckedFloat64ToInt32(mode, feedback1), value, effect,
+            control);
+        Reduction r1 = Reduce(check1);
+        ASSERT_TRUE(r1.Changed());
+        EXPECT_EQ(r1.replacement(), check1);
+
+        Node* check2 = effect = graph()->NewNode(
+            simplified()->CheckedFloat64ToInt32(mode, feedback2), value, effect,
+            control);
+        Reduction r2 = Reduce(check2);
+        ASSERT_TRUE(r2.Changed());
+        EXPECT_EQ(r2.replacement(), check1);
+      }
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedInt32ToTaggedSigned
+
+TEST_F(RedundancyEliminationTest, CheckedInt32ToTaggedSigned) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedInt32ToTaggedSigned(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedInt32ToTaggedSigned(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedInt64ToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedInt64ToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect = graph()->NewNode(
+          simplified()->CheckedInt64ToInt32(feedback1), value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckedInt64ToInt32(feedback2), value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedInt64ToTaggedSigned
+
+TEST_F(RedundancyEliminationTest, CheckedInt64ToTaggedSigned) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedInt64ToTaggedSigned(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedInt64ToTaggedSigned(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTaggedSignedToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedTaggedSignedToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedTaggedSignedToInt32(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedTaggedSignedToInt32(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTaggedToFloat64
+
+TEST_F(RedundancyEliminationTest, CheckedTaggedToFloat64) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      TRACED_FOREACH(CheckTaggedInputMode, mode, kCheckTaggedInputModes) {
+        Node* value = Parameter(0);
+        Node* effect = graph()->start();
+        Node* control = graph()->start();
+
+        Node* check1 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedToFloat64(mode, feedback1), value,
+            effect, control);
+        Reduction r1 = Reduce(check1);
+        ASSERT_TRUE(r1.Changed());
+        EXPECT_EQ(r1.replacement(), check1);
+
+        Node* check2 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedToFloat64(mode, feedback2), value,
+            effect, control);
+        Reduction r2 = Reduce(check2);
+        ASSERT_TRUE(r2.Changed());
+        EXPECT_EQ(r2.replacement(), check1);
+      }
+    }
+  }
+}
+
+TEST_F(RedundancyEliminationTest,
+       CheckedTaggedToFloat64SubsubmedByCheckedTaggedToFloat64) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      // If the check passed for CheckTaggedInputMode::kNumber, it'll
+      // also pass later for CheckTaggedInputMode::kNumberOrOddball.
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedTaggedToFloat64(
+                               CheckTaggedInputMode::kNumber, feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckedTaggedToFloat64(
+              CheckTaggedInputMode::kNumberOrOddball, feedback2),
+          value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTaggedToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedTaggedToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      TRACED_FOREACH(CheckForMinusZeroMode, mode, kCheckForMinusZeroModes) {
+        Node* value = Parameter(0);
+        Node* effect = graph()->start();
+        Node* control = graph()->start();
+
+        Node* check1 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedToInt32(mode, feedback1), value, effect,
+            control);
+        Reduction r1 = Reduce(check1);
+        ASSERT_TRUE(r1.Changed());
+        EXPECT_EQ(r1.replacement(), check1);
+
+        Node* check2 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedToInt32(mode, feedback2), value, effect,
+            control);
+        Reduction r2 = Reduce(check2);
+        ASSERT_TRUE(r2.Changed());
+        EXPECT_EQ(r2.replacement(), check1);
+      }
+    }
+  }
+}
+
+TEST_F(RedundancyEliminationTest,
+       CheckedTaggedToInt32SubsumedByCheckedTaggedSignedToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      TRACED_FOREACH(CheckForMinusZeroMode, mode, kCheckForMinusZeroModes) {
+        Node* value = Parameter(0);
+        Node* effect = graph()->start();
+        Node* control = graph()->start();
+
+        Node* check1 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedSignedToInt32(feedback1), value, effect,
+            control);
+        Reduction r1 = Reduce(check1);
+        ASSERT_TRUE(r1.Changed());
+        EXPECT_EQ(r1.replacement(), check1);
+
+        Node* check2 = effect = graph()->NewNode(
+            simplified()->CheckedTaggedToInt32(mode, feedback2), value, effect,
+            control);
+        Reduction r2 = Reduce(check2);
+        ASSERT_TRUE(r2.Changed());
+        EXPECT_EQ(r2.replacement(), check1);
+      }
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTaggedToTaggedPointer
+
+TEST_F(RedundancyEliminationTest, CheckedTaggedToTaggedPointer) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect = graph()->NewNode(
+          simplified()->CheckedTaggedToTaggedPointer(feedback1), value, effect,
+          control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckedTaggedToTaggedPointer(feedback2), value, effect,
+          control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTaggedToTaggedSigned
+
+TEST_F(RedundancyEliminationTest, CheckedTaggedToTaggedSigned) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedTaggedToTaggedSigned(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedTaggedToTaggedSigned(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedTruncateTaggedToWord32
+
+TEST_F(RedundancyEliminationTest, CheckedTruncateTaggedToWord32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      TRACED_FOREACH(CheckTaggedInputMode, mode, kCheckTaggedInputModes) {
+        Node* value = Parameter(0);
+        Node* effect = graph()->start();
+        Node* control = graph()->start();
+
+        Node* check1 = effect = graph()->NewNode(
+            simplified()->CheckedTruncateTaggedToWord32(mode, feedback1), value,
+            effect, control);
+        Reduction r1 = Reduce(check1);
+        ASSERT_TRUE(r1.Changed());
+        EXPECT_EQ(r1.replacement(), check1);
+
+        Node* check2 = effect = graph()->NewNode(
+            simplified()->CheckedTruncateTaggedToWord32(mode, feedback2), value,
+            effect, control);
+        Reduction r2 = Reduce(check2);
+        ASSERT_TRUE(r2.Changed());
+        EXPECT_EQ(r2.replacement(), check1);
+      }
+    }
+  }
+}
+
+TEST_F(RedundancyEliminationTest,
+       CheckedTruncateTaggedToWord32SubsumedByCheckedTruncateTaggedToWord32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      // If the check passed for CheckTaggedInputMode::kNumber, it'll
+      // also pass later for CheckTaggedInputMode::kNumberOrOddball.
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedTruncateTaggedToWord32(
+                               CheckTaggedInputMode::kNumber, feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect = graph()->NewNode(
+          simplified()->CheckedTruncateTaggedToWord32(
+              CheckTaggedInputMode::kNumberOrOddball, feedback2),
+          value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedUint32ToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedUint32ToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedUint32ToInt32(feedback1), value,
+                           effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedUint32ToInt32(feedback2), value,
+                           effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedUint32ToTaggedSigned
+
+TEST_F(RedundancyEliminationTest, CheckedUint32ToTaggedSigned) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedUint32ToTaggedSigned(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedUint32ToTaggedSigned(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedUint64ToInt32
+
+TEST_F(RedundancyEliminationTest, CheckedUint64ToInt32) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedUint64ToInt32(feedback1), value,
+                           effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedUint64ToInt32(feedback2), value,
+                           effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
+// CheckedUint64ToTaggedSigned
+
+TEST_F(RedundancyEliminationTest, CheckedUint64ToTaggedSigned) {
+  TRACED_FOREACH(VectorSlotPair, feedback1, vector_slot_pairs()) {
+    TRACED_FOREACH(VectorSlotPair, feedback2, vector_slot_pairs()) {
+      Node* value = Parameter(0);
+      Node* effect = graph()->start();
+      Node* control = graph()->start();
+
+      Node* check1 = effect =
+          graph()->NewNode(simplified()->CheckedUint64ToTaggedSigned(feedback1),
+                           value, effect, control);
+      Reduction r1 = Reduce(check1);
+      ASSERT_TRUE(r1.Changed());
+      EXPECT_EQ(r1.replacement(), check1);
+
+      Node* check2 = effect =
+          graph()->NewNode(simplified()->CheckedUint64ToTaggedSigned(feedback2),
+                           value, effect, control);
+      Reduction r2 = Reduce(check2);
+      ASSERT_TRUE(r2.Changed());
+      EXPECT_EQ(r2.replacement(), check1);
+    }
+  }
+}
+
+}  // namespace redundancy_elimination_unittest
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8