================
@@ -30,8 +32,20 @@ struct State {
   unsigned BitmapBits = 0;
 
   struct Decision {
+    using IndicesTy = llvm::SmallVector<std::array<int, 2>>;
+    static constexpr auto InvalidID = std::numeric_limits<unsigned>::max();
+
     unsigned BitmapIdx;
-    llvm::SmallVector<std::array<int, 2>> Indices;
+    IndicesTy Indices;
+    unsigned ID = InvalidID;
+
+    bool isValid() const { return ID != InvalidID; }
+
+    void update(unsigned I, IndicesTy &&X) {
+      assert(ID != InvalidID);
----------------
ornata wrote:

just use `isValid()`?

https://github.com/llvm/llvm-project/pull/125408
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