(module
 (type $none_=>_none (func))
 (memory $0 1 1)
 (func $foo (type $none_=>_none)
  (drop
   (i32.atomic.rmw.cmpxchg
    (i32.const 0)
    (i32.const 0)
    (i32.const 0)
   )
  )
 )
)