[llvm] r184684 - LoopVectorize: Add utility class for checking dependency among accesses

[Tobias Grosser]

In fact Hal posted a delinearization pass some time ago (I do not have the
email at hand). It did a pretty good job.

Cheers,
Tobi


On Wed, Jul 17, 2013 at 5:48 PM, Andrew Trick <atrick at apple.com> wrote:

>
> On Jul 1, 2013, at 6:14 PM, Chandler Carruth <chandlerc at google.com> wrote:
>
> If we want to define an IR construct to express multidimensional array
> references without linearizing, I suspect we would need a very different /
> new instruction... retrofitting GEP seems risky given its existing uses and
> complexity. If you or other folks have ideas of how to represent this
> effectively in LLVM's IR, by all means fire away. =]
>
>
> Personally, I think it would be useful to at see if we could at least
> delinearize "obvious" or "easy" cases. We might actually get reasonably
> good mileage out of this. However, my perspective here is biased -- I work
> almost exclusively with a language that doesn't provide the guarantees
> Fortran does regarding multidimensional arrays.
>
>
> Agreed. We should find out which important cases cannot be successfully
> delinearized without further IR annotation and only then think about
> extending IR.
>
> -Andy
>
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