Re: Another security vulnerability

Stefan Monnier <monnier@iro.umontreal.ca> schrieb:

Since each chased pointer starts back at LSQ, the cost is no different
than an explicit Prefetch instruction, except without (a),(b) and (c)
having been applied first.

>
I thought the important difference is that the decision to prefetch or
not can be done dynamically based on past history.

Programmers and compilers are notoriously bad at predicting
branches (except for error branches), but ought to be quite good
at predicting prefetches.  If a pointer is loaded, chances are
very high that are it will be dereferenced.