Implement optional turbofan UnalignedLoad and UnalignedStore operators

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index 6a506d26ad334c493ec8c92184eb1bf28b12d0cd..b4628abe085b20015246b57c6c936f5019bb8810 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -79,6 +79,16 @@ StoreRepresentation const& StoreRepresentationOf(Operator const* op) {
   return OpParameter<StoreRepresentation>(op);
 }
 
+UnalignedLoadRepresentation UnalignedLoadRepresentationOf(Operator const* op) {
+  DCHECK_EQ(IrOpcode::kUnalignedLoad, op->opcode());
+  return OpParameter<UnalignedLoadRepresentation>(op);
+}
+
+UnalignedStoreRepresentation const& UnalignedStoreRepresentationOf(
+    Operator const* op) {
+  DCHECK_EQ(IrOpcode::kUnalignedStore, op->opcode());
+  return OpParameter<UnalignedStoreRepresentation>(op);
+}
 
 CheckedLoadRepresentation CheckedLoadRepresentationOf(Operator const* op) {
   DCHECK_EQ(IrOpcode::kCheckedLoad, op->opcode());
@@ -284,6 +294,14 @@ struct MachineOperatorGlobalCache {
               IrOpcode::kLoad, Operator::kNoThrow | Operator::kNoWrite,        \
               "Load", 2, 1, 1, 1, 1, 0, MachineType::Type()) {}                \
   };                                                                           \
+  struct UnalignedLoad##Type##Operator final                                   \
+      : public Operator1<UnalignedLoadRepresentation> {                        \
+    UnalignedLoad##Type##Operator()                                            \
+        : Operator1<UnalignedLoadRepresentation>(                              \
+              IrOpcode::kUnalignedLoad,                                        \
+              Operator::kNoThrow | Operator::kNoWrite, "UnalignedLoad", 2, 1,  \
+              1, 1, 1, 0, MachineType::Type()) {}                              \
+  };                                                                           \
   struct CheckedLoad##Type##Operator final                                     \
       : public Operator1<CheckedLoadRepresentation> {                          \
     CheckedLoad##Type##Operator()                                              \
@@ -292,6 +310,7 @@ struct MachineOperatorGlobalCache {
               "CheckedLoad", 3, 1, 1, 1, 1, 0, MachineType::Type()) {}         \
   };                                                                           \
   Load##Type##Operator kLoad##Type;                                            \
+  UnalignedLoad##Type##Operator kUnalignedLoad##Type;                          \
   CheckedLoad##Type##Operator kCheckedLoad##Type;
   MACHINE_TYPE_LIST(LOAD)
 #undef LOAD
@@ -337,6 +356,14 @@ struct MachineOperatorGlobalCache {
     Store##Type##FullWriteBarrier##Operator()                                  \
         : Store##Type##Operator(kFullWriteBarrier) {}                          \
   };                                                                           \
+  struct UnalignedStore##Type##Operator final                                  \
+      : public Operator1<UnalignedStoreRepresentation> {                       \
+    UnalignedStore##Type##Operator()                                           \
+        : Operator1<UnalignedStoreRepresentation>(                             \
+              IrOpcode::kUnalignedStore,                                       \
+              Operator::kNoRead | Operator::kNoThrow, "UnalignedStore", 3, 1,  \
+              1, 0, 1, 0, MachineRepresentation::Type) {}                      \
+  };                                                                           \
   struct CheckedStore##Type##Operator final                                    \
       : public Operator1<CheckedStoreRepresentation> {                         \
     CheckedStore##Type##Operator()                                             \
@@ -350,6 +377,7 @@ struct MachineOperatorGlobalCache {
   Store##Type##PointerWriteBarrier##Operator                                   \
       kStore##Type##PointerWriteBarrier;                                       \
   Store##Type##FullWriteBarrier##Operator kStore##Type##FullWriteBarrier;      \
+  UnalignedStore##Type##Operator kUnalignedStore##Type;                        \
   CheckedStore##Type##Operator kCheckedStore##Type;
   MACHINE_REPRESENTATION_LIST(STORE)
 #undef STORE
@@ -444,6 +472,35 @@ const Operator* MachineOperatorBuilder::Store(StoreRepresentation store_rep) {
   return nullptr;
 }
 
+const OptionalOperator MachineOperatorBuilder::UnalignedLoad(
+    UnalignedLoadRepresentation rep) {
+#define LOAD(Type)                                                         \
+  if (rep == MachineType::Type()) {                                        \
+    return OptionalOperator(                                               \
+        flags_ & kUnalignedLoad ? &cache_.kUnalignedLoad##Type : nullptr); \
+  }
+  MACHINE_TYPE_LIST(LOAD)
+#undef LOAD
+  UNREACHABLE();
+  return OptionalOperator(nullptr);
+}
+
+const OptionalOperator MachineOperatorBuilder::UnalignedStore(
+    UnalignedStoreRepresentation rep) {
+  switch (rep) {
+#define STORE(kRep)                 \
+  case MachineRepresentation::kRep: \
+    return OptionalOperator(        \
+        flags_ & kUnalignedStore ? &cache_.kUnalignedStore##kRep : nullptr);
+    MACHINE_REPRESENTATION_LIST(STORE)
+#undef STORE
+    case MachineRepresentation::kBit:
+    case MachineRepresentation::kNone:
+      break;
+  }
+  UNREACHABLE();
+  return OptionalOperator(nullptr);
+}
 
 const Operator* MachineOperatorBuilder::CheckedLoad(
     CheckedLoadRepresentation rep) {