>...but those CPUs are still speculative out-of-order super-scalars aren't they? Not universally, even in current-generation devices e.g. the Cortex A53 and A5

>...but those CPUs are still speculative out-of-order super-scalars aren't they? Not universally, even in current-generation devices e.g. the Cortex A53 and A55 are in-order and were explicitly mentioned as safe by ARM. Snapdragon 625/626 is an octa-core Cortex A53 at 2.2GHz in a lot of the current mid-range devices from almost every major phone manufacturer (Xiaomi, Samsung, Moto, Huawei, Asus, Lenovo, ...)