test/atomics-unshared.wast.from-wast - external/github.com/WebAssembly/binaryen - Git at Google

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