Implement optional turbofan UnalignedLoad and UnalignedStore operators

src/compiler/machine-operator-reducer.cc

 // 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.
 
 #include "src/compiler/machine-operator-reducer.h"
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/codegen.h"
 #include "src/compiler/diamond.h"
@@ skipping 420 matching lines @@
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceFloat32(DoubleToFloat32(m.Value()));
       if (m.IsChangeFloat32ToFloat64()) return Replace(m.node()->InputAt(0));
       break;
     }
     case IrOpcode::kFloat64InsertLowWord32:
       return ReduceFloat64InsertLowWord32(node);
     case IrOpcode::kFloat64InsertHighWord32:
       return ReduceFloat64InsertHighWord32(node);
     case IrOpcode::kStore:
+    case IrOpcode::kUnalignedStore:
       return ReduceStore(node);
     case IrOpcode::kFloat64Equal:
     case IrOpcode::kFloat64LessThan:
     case IrOpcode::kFloat64LessThanOrEqual:
       return ReduceFloat64Compare(node);
     default:
       break;
   }
   return NoChange();
 }
@@ skipping 219 matching lines @@
           phi,
           common()->Phi(MachineRepresentation::kWord32, value_input_count));
       return Replace(phi);
     }
   }
   return NoChange();
 }
 
 
 Reduction MachineOperatorReducer::ReduceStore(Node* node) {
-  MachineRepresentation const rep =
-      StoreRepresentationOf(node->op()).representation();
+  MachineRepresentation rep;
   Node* const value = node->InputAt(2);
+
+  switch (node->opcode()) {
+    case IrOpcode::kStore:
+      rep = StoreRepresentationOf(node->op()).representation();
+      break;
+    case IrOpcode::kUnalignedStore:
+      rep = UnalignedStoreRepresentationOf(node->op());
+      break;
+    default:
+      UNREACHABLE();
+      break;
+  }
+
   switch (value->opcode()) {
     case IrOpcode::kWord32And: {
       Uint32BinopMatcher m(value);
       if (m.right().HasValue() && ((rep == MachineRepresentation::kWord8 &&
                                     (m.right().Value() & 0xff) == 0xff) ||
                                    (rep == MachineRepresentation::kWord16 &&
                                     (m.right().Value() & 0xffff) == 0xffff))) {
         node->ReplaceInput(2, m.left().node());
         return Changed(node);
       }
@@ skipping 389 matching lines @@
 MachineOperatorBuilder* MachineOperatorReducer::machine() const {
   return jsgraph()->machine();
 }
 
 
 Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8