[llvm-branch-commits] [llvm] [BOLT] Add profile density computation (PR #101094)

[Amir Ayupov via llvm-branch-commits]

================
@@ -1441,6 +1458,22 @@ Error PrintProgramStats::runOnFunctions(BinaryContext &BC) {
       StaleSampleCount += SampleCount;
       ++NumAllStaleFunctions;
     }
+
+    if (opts::ShowDensity) {
+      uint64_t Size = Function.getSize();
+      // In case of BOLT split functions registered in BAT, executed traces are
+      // automatically attributed to the main fragment. Add up function sizes
+      // for all fragments.
+      if (IsHotParentOfBOLTSplitFunction)
+        for (const BinaryFunction *Fragment : Function.getFragments())
+          Size += Fragment->getSize();
+      double Density = (double)1.0 * Function.getExecutedBytes() / Size;
+      FuncDensityList.emplace_back(Density, SampleCount);
----------------
aaupov wrote:

I'm neutral about using ExecutedBytes but we use SampleCount for other profile-wide stats, e.g. stale samples percent. 

https://github.com/llvm/llvm-project/pull/101094