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Re: “Meltdown” and “Spectre”: Every modern processor has unfixable security flaws

On Fri, Jan 5, 2018 at 6:55 AM,  <tomas@tuxteam.de> wrote:
> (mainframes of that time had at least VM, possibly
> speculative prefetch).

Is it correct to call branch prediction the same as speculative execution?
If so, then "yes" they had it, but I don't honestly know if that's correct.
Pipeline rewinding was necessary on prediction failure, etc, similarly.

> Cheers
> [1] https://en.wikipedia.org/wiki/Motorola_68000
> - -- tomás

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