[llvm-dev] [RFC] IR-level Region Annotations

[Mehdi Amini via llvm-dev]

> On Jan 12, 2017, at 4:20 PM, Reid Kleckner <rnk at google.com> wrote:
> 
> On Wed, Jan 11, 2017 at 8:13 PM, Mehdi Amini <mehdi.amini at apple.com <mailto:mehdi.amini at apple.com>> wrote:
> Can you elaborate why? I’m curious.
> 
> The con of proposal c was that many passes would need to learn about many region intrinsics. With tokens, you only need to teach all passes about tokens, which they should already know about because WinEH and other things use them.
> 
> With tokens, we can add as many region-introducing intrinsics as makes sense without any additional cost to the middle end. We don't need to make one omnibus region intrinsic set that describes every parallel loop annotation scheme supported by LLVM. Instead we would factor things according to other software design considerations.

Thanks for explaining!

— 
Mehdi

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