[PATCH] D10979: Update the branch weight metadata in JumpThreading pass.

[Xinliang David Li]

> Here I am actually using the old BB->SuccBB Frequency as
>
> BPI->setEdgeWeight({BB, SuccBB}, W);
>
> is called after the weight on BB->SuccBB is updated. So the
> probability is still the old one.
>

The problem is that when adjusting 'W', you have

auto BBFreq =   BFI->getBlockFreq(BB) * BPI->getEdgeProbability(BB, SuccBB);

Note that this is done after you update BB's frequency:

 BFI->setBlockFreq(BB, NewBBFreq);


You old version of the patch is correct though (as it is using the old BBFreq).

David


>>
>> http://reviews.llvm.org/D10979
>>
>>
>>