Issue #28126: Replace Py_MEMCPY with memcpy(). Visual Studio can properly optimize memcpy().
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 17da5c9..36f2242 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2353,7 +2353,7 @@
 
     /* use borrowed references */
     stack[0] = obj;
-    Py_MEMCPY(&stack[1],
+    memcpy(&stack[1],
               &PyTuple_GET_ITEM(args, 0),
               argcount * sizeof(PyObject *));
 
@@ -2428,7 +2428,7 @@
     }
 
     /* Copy position arguments (borrowed references) */
-    Py_MEMCPY(stack, args, nargs * sizeof(stack[0]));
+    memcpy(stack, args, nargs * sizeof(stack[0]));
 
     kwstack = stack + nargs;
     pos = i = 0;