4 ms·

I don't understand how this fix can possibly be so performant. The speculative executions must be doing something positive, right? It seems like it should nev

• bradleyjkemp 9y ago
  Sounds like they're just forcing the CPU to use a different (less vulnerable) type of predictor. It's the branch target predictor that's vulnerable so instead of using a branch instruction the compiler now adds a mini stack frame (with the return address as the place we want to jump to) and then "returns". The CPU now happily predicts the target using the non-vulnerable stack predictor and does do speculative execution.