[Mesa-dev] Partial loop unrolling support v2

[Timothy Arceri]

Ping!

On 20/11/18 7:14 pm, Timothy Arceri wrote:
> This series add support for partial loop unrolling for loops with an
> unknown trip count. The new partial_unroll function allows the caller
> to specifiy how may times the loop should be unrolled and then the
> loop is inserted in the innermost continue branch of the unrolled loop.
> 
> For now we only do partial unrolling for loops where we can guess the
> iteration count based on array access that uses an induction variable
> as its index (see patch 7).
> 
> Patches 1-6 are tidy-ups/refactors.
> 
> Patch 7 adds a method for guessing the trip count for the loop.
> 
> Patch 8-9 add partial unrolling support and also support for removing
> redundant load/stores from the remaining loop when considering if
> we would be accessing an array out bounds. Eliminating these out of
> bounds accesses allows the loop to be completely removed in
> some cases.
> 
> Patch 10-11 are support for full unrolling of some loops pointed
> out to me by Jason.
> 
> v2:
> - added patch 2 to clarify some loop info member names and hopefully
>    make the code easier to follow now that the number of unrolling
>    scenarios are growing.
> - added patches 10-11 these do full unrolling rather than partial
>    unrolling but make use of some of the refactors done by this series.
> 
> 
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