[turbofan] Separate representation type operations from the semantic types.

src/types.h

Index: src/types.h
diff --git a/src/types.h b/src/types.h
index 55c7e6c4692d8e19c89177a97128bd8ee222cd8b..b43ac6c3a4dd15377c5c1f004ef99d0b403d74c7 100644
--- a/src/types.h
+++ b/src/types.h
@@ -349,6 +349,16 @@ class TypeImpl : public Config::Base {
   PROPER_BITSET_TYPE_LIST(DEFINE_TYPE_CONSTRUCTOR)
   #undef DEFINE_TYPE_CONSTRUCTOR
 
+#define DEFINE_TYPE_CONSTRUCTOR(type, value)                 \
+  static TypeImpl* Mask##type##ForTesting() {                \
+    return BitsetType::New(BitsetType::k##type);             \
+  }                                                          \
+  static TypeHandle Mask##type##ForTesting(Region* region) { \
+    return BitsetType::New(BitsetType::k##type, region);     \
+  }
+  MASK_BITSET_TYPE_LIST(DEFINE_TYPE_CONSTRUCTOR)
+#undef DEFINE_TYPE_CONSTRUCTOR
+
   static TypeImpl* SignedSmall() {
     return BitsetType::New(BitsetType::SignedSmall());
   }
@@ -535,6 +545,7 @@ class TypeImpl : public Config::Base {
 #endif
 
   bool IsUnionForTesting() { return IsUnion(); }
+  bitset GetRepresentationForTesting() { return GetRepresentation(); }
 
  protected:
   // Friends.
@@ -563,12 +574,16 @@ class TypeImpl : public Config::Base {
   }
   UnionType* AsUnion() { return UnionType::cast(this); }
 
+  bitset GetRepresentation();
+
   // Auxiliary functions.
+  bool SemanticMaybe(TypeImpl* that);
 
   bitset BitsetGlb() { return BitsetType::Glb(this); }
   bitset BitsetLub() { return BitsetType::Lub(this); }
 
   bool SlowIs(TypeImpl* that);
+  bool SemanticIs(TypeImpl* that);
 
   static bool IsInteger(double x) {
     return nearbyint(x) == x && !i::IsMinusZero(x);  // Allows for infinities.
@@ -580,16 +595,9 @@ class TypeImpl : public Config::Base {
   struct Limits {
     double min;
     double max;
-    bitset representation;
-    Limits(double min, double max, bitset representation)
-        : min(min), max(max), representation(representation) {}
-    explicit Limits(RangeType* range)
-        : min(range->Min()),
-          max(range->Max()),
-          representation(REPRESENTATION(range->Bound())) {}
-    static Limits Empty(Region* region) {
-      return Limits(1, 0, BitsetType::kNone);
-    }
+    Limits(double min, double max) : min(min), max(max) {}
+    explicit Limits(RangeType* range) : min(range->Min()), max(range->Max()) {}
+    static Limits Empty(Region* region) { return Limits(1, 0); }
   };
 
   static bool IsEmpty(Limits lim);
@@ -649,11 +657,13 @@ class TypeImpl<Config>::BitsetType : public TypeImpl<Config> {
     if (FLAG_enable_slow_asserts) CheckNumberBits(bits);
     return Config::from_bitset(bits, region);
   }
-  // TODO(neis): Eventually allow again for types with empty semantics
-  // part and modify intersection and possibly subtyping accordingly.
 
   static bool IsInhabited(bitset bits) {
-    return bits & kSemantic;
+    return SEMANTIC(bits) != kNone && REPRESENTATION(bits) != kNone;
+  }
+
+  static bool SemanticIsInhabited(bitset bits) {
+    return SEMANTIC(bits) != kNone;
   }
 
   static bool Is(bitset bits1, bitset bits2) {
@@ -855,8 +865,8 @@ class TypeImpl<Config>::RangeType : public TypeImpl<Config> {
     return Config::template cast<RangeType>(Config::from_range(range));
   }
 
-  static RangeHandle New(Limits lim, Region* region) {
-    return New(lim.min, lim.max, BitsetType::New(lim.representation, region),
+  static RangeHandle New(Limits lim, bitset representation, Region* region) {
+    return New(lim.min, lim.max, BitsetType::New(representation, region),
                region);
   }
 
@@ -866,7 +876,6 @@ class TypeImpl<Config>::RangeType : public TypeImpl<Config> {
   }
 };
 // TODO(neis): Also cache min and max values.
-// TODO(neis): Allow restricting the representation.
 
 
 // -----------------------------------------------------------------------------