[clang] [PGO] Add ability to mark cold functions as optsize/minsize/optnone (PR #69030)

[David Li via cfe-commits]

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@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Instrumentation/MarkColdFunctions.h"
+#include "llvm/Analysis/BlockFrequencyInfo.h"
+#include "llvm/Analysis/ProfileSummaryInfo.h"
+#include "llvm/IR/PassManager.h"
+
+using namespace llvm;
+
+PreservedAnalyses MarkColdFunctionsPass::run(Module &M,
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david-xl wrote:

yes, you can use profile-sample-accurate or profile-accurate-for-syminlist to control the behavior, similar to how AFDO is selecting functions to put in .text.unlikely.

https://github.com/llvm/llvm-project/pull/69030