[PATCH] D25963: [LoopUnroll] Implement profile-based loop peeling

[Xinliang David Li via llvm-commits]

On Wed, Oct 26, 2016 at 10:08 AM, Gerolf Hoflehner <ghoflehner at apple.com>
wrote:

> Gerolf added a comment.
>
> Hi,
>
> Could you provide more background on this idea?  What is your motivational
> use case? When the trip count is low why optimize?


Low trip count loop can be hot too.

David



> If the profile is wrong and it actually is a hot loop for a
> regular/different input set peeling could hurt. There are also side effects
> on code size, register pressure etc. that could hurt performance.
>
> Thanks
> Gerolf
>
>
> https://reviews.llvm.org/D25963
>
>
>
>
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