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...aining instance of B and the newly created call sites within A. I plan to split the estimated count in roughly the ratio of the entries into B. As a result, a given call site BC (originally from B into C) would be split into two sites AC, and BC with estimated counts (AB.count/B.entry_count * OrigBC.count) and ((1-AB.count/B.entry_count) * OrigBC.count). This does require updating the body of the callee, not just the caller when inlining. It's important to note that the resulting estimated call counts can be just flat out wrong. As the easiest example, consider a case where B called...