[PATCH] D12341: add llvm.unpredictable intrinsic and lower it to metadata

[Krzysztof Parzyszek via llvm-commits]

kparzysz added a comment.

In http://reviews.llvm.org/D12341#234428, @hfinkel wrote:

> Meaning that we have metadata, that instead of counting the number of relative branches, counts the relative number of mispredicated branches (or predicted branches). Thoughts?


The number of times the branch changed directions and (divided by?) the number of times it was executed sounds ok.  Do we want to differentiate between AAAAABAB and AABBAABB (which this scheme won't)?


http://reviews.llvm.org/D12341