They execute everything in order on a fairly short pipeline but they engage in speculative execution just like everyone else. Here's their talk on their branch

They execute everything in order on a fairly short pipeline but they engage in speculative execution just like everyone else. Here's their talk on their branch predictor. https://millcomputing.com/docs/prediction/ https://millcomputing.com/docs/prediction/ There's a lot less mischief you can get up to when you only execute a couple of instructions beyond a mispredicted branch rather than a hundred but mischief can't be theoretically ruled out entirely.