On Thu, Oct 13, 2011 at 6:57 PM, Andi Kleen <a...@firstfloor.org> wrote: >> Or I am missing someting? > > I often see the x86 vectorizer with -mtune=generic generate a lot of > complicated code just to adjust for potential misalignment. > > My thought was just if the alias oracle knows what the original > declaration is, and it's available for changes (e.g. LTO), it would be > likely be better to just add an __attribute__((aligned())) > there. > > In the general case it's probably harder, you would need some > cost model to decide when it's worth it. > > Your approach of course would still be needed for cases where this > isn't possible. But it sounded like the infrastructure you're building > could in principle do both.
The vectorizer already does that. Richard. > -Andi >
