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

src/compiler/load-elimination.cc

 // Copyright 2016 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/load-elimination.h"
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 817 matching lines @@
   Node* const old_value = state->LookupElement(object, index);
   if (old_value == new_value) {
     // This store is fully redundant.
     return Replace(effect);
   }
   // Kill all potentially aliasing elements.
   state = state->KillElement(object, index, zone());
   // Only record the new value if the store doesn't have an implicit truncation.
   switch (access.machine_type.representation()) {
     case MachineRepresentation::kNone:
+    case MachineRepresentation::kSimd1x4:
+    case MachineRepresentation::kSimd1x8:
+    case MachineRepresentation::kSimd1x16:
     case MachineRepresentation::kBit:
       UNREACHABLE();
       break;
     case MachineRepresentation::kWord8:
     case MachineRepresentation::kWord16:
     case MachineRepresentation::kWord32:
     case MachineRepresentation::kWord64:
     case MachineRepresentation::kFloat32:
       // TODO(turbofan): Add support for doing the truncations.
       break;
@@ skipping 182 matching lines @@
   return field_index - 1;
 }
 
 // static
 int LoadElimination::FieldIndexOf(FieldAccess const& access) {
   MachineRepresentation rep = access.machine_type.representation();
   switch (rep) {
     case MachineRepresentation::kNone:
     case MachineRepresentation::kBit:
     case MachineRepresentation::kSimd128:
+    case MachineRepresentation::kSimd1x4:
+    case MachineRepresentation::kSimd1x8:
+    case MachineRepresentation::kSimd1x16:
       UNREACHABLE();
       break;
     case MachineRepresentation::kWord32:
     case MachineRepresentation::kWord64:
       if (rep != MachineType::PointerRepresentation()) {
         return -1;  // We currently only track pointer size fields.
       }
       break;
     case MachineRepresentation::kWord8:
     case MachineRepresentation::kWord16:
@@ skipping 21 matching lines @@
   return jsgraph()->common();
 }
 
 Graph* LoadElimination::graph() const { return jsgraph()->graph(); }
 
 Factory* LoadElimination::factory() const { return jsgraph()->factory(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8