Implement optional turbofan UnalignedLoad and UnalignedStore operators

src/compiler/machine-operator.h

 // Copyright 2013 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_COMPILER_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/machine-type.h"
 
@@ skipping 72 matching lines @@
 
 bool operator==(StoreRepresentation, StoreRepresentation);
 bool operator!=(StoreRepresentation, StoreRepresentation);
 
 size_t hash_value(StoreRepresentation);
 
 std::ostream& operator<<(std::ostream&, StoreRepresentation);
 
 StoreRepresentation const& StoreRepresentationOf(Operator const*);
 
+typedef MachineType UnalignedLoadRepresentation;
+
+UnalignedLoadRepresentation UnalignedLoadRepresentationOf(Operator const*);
+
+// An UnalignedStore needs a MachineType.
+typedef MachineRepresentation UnalignedStoreRepresentation;
+
+UnalignedStoreRepresentation const& UnalignedStoreRepresentationOf(
+    Operator const*);
 
 // A CheckedLoad needs a MachineType.
 typedef MachineType CheckedLoadRepresentation;
 
 CheckedLoadRepresentation CheckedLoadRepresentationOf(Operator const*);
 
 
 // A CheckedStore needs a MachineType.
 typedef MachineRepresentation CheckedStoreRepresentation;
 
@@ skipping 27 matching lines @@
     kFloat64RoundTiesAway = 1u << 12,
     kInt32DivIsSafe = 1u << 13,
     kUint32DivIsSafe = 1u << 14,
     kWord32ShiftIsSafe = 1u << 15,
     kWord32Ctz = 1u << 16,
     kWord64Ctz = 1u << 17,
     kWord32Popcnt = 1u << 18,
     kWord64Popcnt = 1u << 19,
     kWord32ReverseBits = 1u << 20,
     kWord64ReverseBits = 1u << 21,
+    kUnalignedLoad = 1u << 22,
+    kUnalignedStore = 1u << 23,
     kAllOptionalOps = kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
                       kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
                       kFloat64RoundUp | kFloat32RoundTruncate |
                       kFloat64RoundTruncate | kFloat64RoundTiesAway |
                       kFloat32RoundTiesEven | kFloat64RoundTiesEven |
                       kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt |
-                      kWord32ReverseBits | kWord64ReverseBits
+                      kWord32ReverseBits | kWord64ReverseBits | kUnalignedLoad |
+                      kUnalignedStore
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
   explicit MachineOperatorBuilder(
       Zone* zone,
       MachineRepresentation word = MachineType::PointerRepresentation(),
       Flags supportedOperators = kNoFlags);
 
   const Operator* Word32And();
   const Operator* Word32Or();
@@ skipping 159 matching lines @@
   const Operator* Float64ExtractHighWord32();
   const Operator* Float64InsertLowWord32();
   const Operator* Float64InsertHighWord32();
 
   // load [base + index]
   const Operator* Load(LoadRepresentation rep);
 
   // store [base + index], value
   const Operator* Store(StoreRepresentation rep);
 
+  // unaligned load [base + index]
+  const OptionalOperator UnalignedLoad(UnalignedLoadRepresentation rep);
+
+  // unaligned store [base + index], value
+  const OptionalOperator UnalignedStore(UnalignedStoreRepresentation rep);
+
   const Operator* StackSlot(MachineRepresentation rep);
 
   // Access to the machine stack.
   const Operator* LoadStackPointer();
   const Operator* LoadFramePointer();
   const Operator* LoadParentFramePointer();
 
   // checked-load heap, index, length
   const Operator* CheckedLoad(CheckedLoadRepresentation);
   // checked-store heap, index, length, value
@@ skipping 43 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_