TurboFan: Introduce TaggedSigned and TaggedPointer representations.

src/machine-type.h

 // Copyright 2014 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.
 
 #ifndef V8_MACHINE_TYPE_H_
 #define V8_MACHINE_TYPE_H_
 
 #include <iosfwd>
 
 #include "src/base/bits.h"
 #include "src/globals.h"
 #include "src/signature.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 enum class MachineRepresentation : uint8_t {
   kNone,
   kBit,
   kWord8,
   kWord16,
   kWord32,
   kWord64,
   kFloat32,
   kFloat64,  // must follow kFloat32
   kSimd128,  // must follow kFloat64
+  kTaggedSigned,
+  kTaggedPointer,
   kTagged
 };
 
 const char* MachineReprToString(MachineRepresentation);
 
 enum class MachineSemantic : uint8_t {
   kNone,
   kBool,
   kInt32,
   kUint32,
@@ skipping 183 matching lines @@
     case MachineRepresentation::kWord16:
       return 1;
     case MachineRepresentation::kWord32:
     case MachineRepresentation::kFloat32:
       return 2;
     case MachineRepresentation::kWord64:
     case MachineRepresentation::kFloat64:
       return 3;
     case MachineRepresentation::kSimd128:
       return 4;
+    case MachineRepresentation::kTaggedSigned:
+    case MachineRepresentation::kTaggedPointer:
     case MachineRepresentation::kTagged:
       return kPointerSizeLog2;
     default:
       break;
   }
   UNREACHABLE();
   return -1;
 }
 
 typedef Signature<MachineType> MachineSignature;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MACHINE_TYPE_H_