llvm dev - Oct 2019 - Heuristics of BranchProbabilityInfo

Dear all,

There are a bunch of heuristics with different weights for *taken* and *not
taken* cases in BranchProbabilityInfo.cpp file. Is there any documentation
available, explaining how such weights are arrived at?

Also, is it of interest to improve the heuristics? For example, in the case
of loop branch heuristic, it may be helpful to consider trip count for
calculating the weights. Similarly, other heuristics can be improved.

Thanks,
Venkat
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