[turbofan] Do Smi comparison without untagging when lowering SpeculativeNumber(Compare).

src/compiler/representation-change.cc

 // Copyright 2015 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/representation-change.h"
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 799 matching lines @@
     case IrOpcode::kSpeculativeNumberDivide:
       return simplified()->CheckedInt32Div();
     case IrOpcode::kSpeculativeNumberModulus:
       return simplified()->CheckedInt32Mod();
     default:
       UNREACHABLE();
       return nullptr;
   }
 }
 
+const Operator* RepresentationChanger::TaggedSignedOperatorFor(
+    IrOpcode::Value opcode) {
+  switch (opcode) {
+    case IrOpcode::kSpeculativeNumberLessThan:
+      return machine()->Is32() ? machine()->Int32LessThan()
+                               : machine()->Int64LessThan();
+    case IrOpcode::kSpeculativeNumberLessThanOrEqual:
+      return machine()->Is32() ? machine()->Int32LessThanOrEqual()
+                               : machine()->Int64LessThanOrEqual();
+    case IrOpcode::kSpeculativeNumberEqual:
+      return machine()->Is32() ? machine()->Word32Equal()
+                               : machine()->Word64Equal();
+    default:
+      UNREACHABLE();
+      return nullptr;
+  }
+}
+
 const Operator* RepresentationChanger::Uint32OperatorFor(
     IrOpcode::Value opcode) {
   switch (opcode) {
     case IrOpcode::kNumberAdd:
       return machine()->Int32Add();
     case IrOpcode::kNumberSubtract:
       return machine()->Int32Sub();
     case IrOpcode::kSpeculativeNumberMultiply:
     case IrOpcode::kNumberMultiply:
       return machine()->Int32Mul();
@@ skipping 182 matching lines @@
                                      node);
 }
 
 Node* RepresentationChanger::InsertChangeUint32ToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(machine()->ChangeUint32ToFloat64(), node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8