[Mesa-dev] Partial loop unrolling support

[Jason Ekstrand]

I also saw a case last week where the induction variable is <= imax(thing,
4) and it'd be nice to unroll those too.

--Jason

On Mon, Nov 19, 2018 at 12:18 AM Timothy Arceri <tarceri at itsqueeze.com>
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 adds 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.
>
>
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