[PATCH] Allow global structures to be vectorized

[Renato Golin]

On 6 February 2013 18:16, Arnold Schwaighofer <aschwaighofer at apple.com>wrote:

> If you want to use Alias analysis see
> MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) for an
> example how-to query AA if two accesses might alias. In principle,  you
> query AA->getLocation(Inst) to obtain the location (ignoring special
> cases). You then use this info to query AA->alias(Loc1, Loc2).
>

Thanks! So it seems I was in the right direction...



> I am not sure the cases we would catch justify the added cost. This would
> have to be evaluated.
>

I'm trying to avoid it at all costs, this is why my initial attempt was to
store the data and *ONLY* if they're the same, I then go on to run the AA.

Maybe an alternative is to store the Instruction and the Value (not just
the Value) on the WriteObjects, and only when the Values match, I do AA on
the Instructions. Then, I don't need the OffsetList at all. I think that
has a good value, can you see anything wrong with it?

cheers,
--renato
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