On 20/11/18 2:46 am, Jason Ekstrand wrote:
I also saw a case last week where the induction variable is <=
imax(thing, 4) and it'd be nice to unroll those too.
That is an interesting one. It means we could do a simple unroll for the
first 4 iterations i.e no if statements required, which is a bit of a
different use case from the new functions introduced in this series but
shouldn't bee too hard to do.
--Jason
On Mon, Nov 19, 2018 at 12:18 AM Timothy Arceri <tarc...@itsqueeze.com
<mailto:tarc...@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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