[PATCH] D131306: [llvm][misexpect] Track provenance of branch weights

Fri Jan 13 14:54:15 PST 2023

paulkirth added a comment.

In D131306#4052782 <https://reviews.llvm.org/D131306#4052782>, @tejohnson wrote:

> In D131306#4037037 <https://reviews.llvm.org/D131306#4037037>, @paulkirth wrote:
>
>> @tejohnson @xur I kind of dropped the ball on these patches, but what are your thoughts on this approach over the old(more invasive) change to the profdata format I had prototyped before? the patch will obviously need to be rebased, but other than that, do we see a downside to handling provenance tracking for branch weights this way?
>
> Sorry, it looks like you were waiting on a review of the latest changes from me but I didn't get to it. I don't recall the other changes you prototyped off the top of my head - can you point me to that?

It was just the last revision of this patch https://reviews.llvm.org/D131306?vs=on&id=450448#toc. The way I handled it before was to leave the MD_prof layout alone and use a new MD type to track the provenance. It had the benefit of leaving the layout alone, and the downside that //every// place that did something w/ MD_prof needed to copy that as well.

> But I don't have an issue with this approach as I recall it seemed cleanest at the time.

Sounds good. I'll start work updating this then. Thanks!

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