Implement UnaligedLoad and UnaligedStore turbofan operators.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 6ab2ee49c1170991fba1597ae2cca1665376f171..f75472beb6490c8bcd5a5bc382904a78c33ac29f 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -70,6 +70,15 @@ 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;
@@ -121,13 +130,16 @@ class MachineOperatorBuilder final : public ZoneObject {
     kWord64ReverseBits = 1u << 21,
     kFloat32Neg = 1u << 22,
     kFloat64Neg = 1u << 23,
-    kAllOptionalOps =
-        kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
-        kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
-        kFloat64RoundUp | kFloat32RoundTruncate | kFloat64RoundTruncate |
-        kFloat64RoundTiesAway | kFloat32RoundTiesEven | kFloat64RoundTiesEven |
-        kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt |
-        kWord32ReverseBits | kWord64ReverseBits | kFloat32Neg | kFloat64Neg
+    kUnalignedLoad = 1u << 24,

[titzer, 2016/07/11 08:40:00]

Isn't this superfluous with the AlignmentRequirements?

[ivica.bogosavljevic, 2016/07/11 09:34:43]

Acknowledged.

+    kUnalignedStore = 1u << 25,
+    kAllOptionalOps = kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
+                      kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
+                      kFloat64RoundUp | kFloat32RoundTruncate |
+                      kFloat64RoundTruncate | kFloat64RoundTiesAway |
+                      kFloat32RoundTiesEven | kFloat64RoundTiesEven |
+                      kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt |
+                      kWord32ReverseBits | kWord64ReverseBits | kFloat32Neg |
+                      kFloat64Neg | kUnalignedLoad | kUnalignedStore
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
@@ -601,6 +613,12 @@ class MachineOperatorBuilder final : public ZoneObject {
   // 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.