Use scratchData on `IRInst` to replace HashSets. (#2978)

* Use scratchData on `IRInst` to replace HashSets.

* Update test results.

* Initialize scratchData.

* Update autodiff documentation.

* Use enum instead of bool.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/source/slang/slang-ast-builder.h b/source/slang/slang-ast-builder.h
index 618636417..a2543ab1e 100644
--- a/source/slang/slang-ast-builder.h
+++ b/source/slang/slang-ast-builder.h
@@ -143,7 +143,10 @@ public:
         ShortList<NodeOperand, 4> operands;
 
         bool operator==(NodeDesc const& that) const;
-        HashCode getHashCode() const;
+        HashCode getHashCode() const { return hashCode; }
+        void init();
+    private:
+        HashCode hashCode = 0;
     };
 
     template<typename NodeCreateFunc>
@@ -217,6 +220,7 @@ public:
         NodeDesc desc;
         desc.type = T::kType;
         addOrAppendToNodeList(desc.operands, args...);
+        desc.init();
         return (T*)_getOrCreateImpl(desc, [&]()
             {
                 return create<T>(args...);
@@ -230,6 +234,7 @@ public:
 
         NodeDesc desc;
         desc.type = T::kType;
+        desc.init();
         return (T*)_getOrCreateImpl(desc, [this]() { return create<T>(); });
     }
 
@@ -240,6 +245,7 @@ public:
         NodeDesc desc;
         desc.type = T::kType;
         addOrAppendToNodeList(desc.operands, args...);
+        desc.init();
         return (T*)_getOrCreateImpl(desc, [&]()
             {
                 return create<T>();
@@ -253,6 +259,7 @@ public:
         NodeDesc desc;
         desc.type = T::kType;
         desc.operands.addRange(operands);
+        desc.init();
         return (T*)_getOrCreateImpl(desc, [&]()
             {
                 return create<T>();
@@ -305,6 +312,7 @@ public:
         {
             desc.operands.add(outer);
         }
+        desc.init();
         auto result = (GenericSubstitution*)_getOrCreateImpl(desc, [this]() {return create<GenericSubstitution>(); });
         if (result->args.getCount() != args.getCount())
         {
@@ -326,6 +334,7 @@ public:
         {
             desc.operands.add(outer);
         }
+        desc.init();
         auto result = (ThisTypeSubstitution*)_getOrCreateImpl(desc, [this]() {return create<ThisTypeSubstitution>(); });
         result->interfaceDecl = interfaceDecl;
         result->witness = subtypeWitness;