[V8] Implement SIMD Boolean vector types to allow mask registers.

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 151 matching lines @@
       DCHECK(use_info.type_check() == TypeCheckKind::kNone);
       return GetBitRepresentationFor(node, output_rep, output_type);
     case MachineRepresentation::kWord8:
     case MachineRepresentation::kWord16:
     case MachineRepresentation::kWord32:
       return GetWord32RepresentationFor(node, output_rep, output_type, use_node,
                                         use_info);
     case MachineRepresentation::kWord64:
       DCHECK(use_info.type_check() == TypeCheckKind::kNone);
       return GetWord64RepresentationFor(node, output_rep, output_type);
-    case MachineRepresentation::kSimd128:  // Fall through.
-      // TODO(bbudge) Handle conversions between tagged and untagged.
-      break;
+    case MachineRepresentation::kSimd128:
+    case MachineRepresentation::kSimd1x4:
+    case MachineRepresentation::kSimd1x8:
+    case MachineRepresentation::kSimd1x16:
     case MachineRepresentation::kNone:
       return node;
   }
   UNREACHABLE();
   return nullptr;
 }
 
 Node* RepresentationChanger::GetTaggedSignedRepresentationFor(
     Node* node, MachineRepresentation output_rep, Type* output_type,
     Node* use_node, UseInfo use_info) {
@@ skipping 851 matching lines @@
                                      node);
 }
 
 Node* RepresentationChanger::InsertChangeUint32ToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(machine()->ChangeUint32ToFloat64(), node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8