[llvm] [ICP] Introduce a hot function cutoff threshold for ICP (PR #208060)

[Congzhe Cao via llvm-commits]

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@@ -160,6 +160,11 @@ static cl::list<std::string> ICPIgnoredBaseTypes(
         "binary could be different due to profiling limitations. Type info "
         "names are those string literals used in LLVM type metadata"));
 
+static cl::opt<int> HotFuncCutoffForICP(
+    "hot-func-cutoff-for-icp", cl::Hidden, cl::init(990000),
+    cl::desc("A count is hot for indirect call promotion if it exceeds "
+             "the minimum count to reach this percentile of total counts."
+             "Default value is the same as ProfileSummaryCutoffHot."));
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CongzheUalberta wrote:

> That makes sense, I've updated the code accordingly - make the default value of HotFuncCutoffForICP to -1 and when unspecified, use the value of ProfileSummaryCutoffHot, to make it stay in sync. I'd appreciate it if you could let me know how that looks now @teresajohnson .



https://github.com/llvm/llvm-project/pull/208060