diff --git a/pykokkos/interface/atomic/atomic_fetch_op.py b/pykokkos/interface/atomic/atomic_fetch_op.py
index e42e2752..14846351 100644
--- a/pykokkos/interface/atomic/atomic_fetch_op.py
+++ b/pykokkos/interface/atomic/atomic_fetch_op.py
@@ -45,17 +45,19 @@ def atomic_fetch_max(
         view: View,
         indices: List[int],
         value: Union[int, float]) -> Union[int, float]:
+    old_result: int = view[indices[-1]]
     inner = reduce(operator.getitem, indices[:-1], view)
     inner[indices[-1]] = max(inner[indices[-1]], value)
-    return inner[indices[-1]] 
+    return old_result 
 
 def atomic_fetch_min(
         view: View,
         indices: List[int],
         value: Union[int, float]) -> Union[int, float]:
+    old_result: int = view[indices[-1]]
     inner = reduce(operator.getitem, indices[:-1], view)
     inner[indices[-1]] = min(inner[indices[-1]], value)
-    return inner[indices[-1]] 
+    return old_result
 
 def atomic_fetch_mod(
         view: View,
@@ -110,4 +112,8 @@ def atomic_compare_exchange(
         indices: List[int],
         comparison_value: int,
         new_value: int) -> int:
-    pass
+    inner = reduce(operator.getitem, indices[:-1], view)
+    old_result = inner[indices[-1]]
+    if old_result == comparison_value:
+        inner[indices[-1]] = new_value
+    return old_result