[PATCH] Fix bug 23851: Preserve metadata for the unswitched branch in loop-unswitch

[Weiming Zhao]

HI Philip,

Thanks for reviewing and the suggestions. I will check the direction and white list the metadata.

Weiming

In http://reviews.llvm.org/D10458#189642, @reames wrote:

> Can you upload a full context diff please?  It's hard to assess what you're changing with the current limited context.
>
> The general direction seems workable.
>
> A couple of questions:
>
> 1. Are we sure the direction of the branches are the same?  If not, we may need to invert the profile metadata.
> 2. Should we passing in the original terminator?  Or just information about the metadata?  Once I have context, I may have suggestions in this area.
> 3. You should white list the metadata.  Not all metadata will neccessarily apply.





http://reviews.llvm.org/D10458

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