Fix fusion CostBasedFusion::aggregate_operations

Qiskit · Feb 27, 2024 · 7bed6d8 · 7bed6d8
1 parent 5991cf8
commit 7bed6d8
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/transpile/fusion.hpp b/src/transpile/fusion.hpp
@@ -1038,7 +1038,8 @@ bool CostBasedFusion::aggregate_operations(oplist_t &ops,
         double estimated_cost =
             estimate_cost(ops, (uint_t)j,
                           i) // fusion gate from j-th to i-th, and
-            + (j == 0 ? 0.0 : costs[j - 1 - fusion_start]); // cost of (j-1)-th
+            + (j <= fusion_start ? 0.0 : costs[j - 1 - fusion_start]);
+                             // cost of (j-1)-th
 
         // update cost
         if (estimated_cost <= costs[i - fusion_start]) {