[llvm] [BOLT][NFC] Don't assign YAML profile to functions with no CFG (PR #92487)

[Amir Ayupov via llvm-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/92487

YAML profile for non-simple functions without CFG is
  1) useless for optimizations,
  2) can't be attached, similar to fdata profile,
  3) would be reported as invalid/stale even if the profile is valid.

Don't attempt to attach the profile in this case, aligning the behavior
to DataReader.

>From 3b5a28e11473ce8d2b1df51f7e88908dab168dc2 Mon Sep 17 00:00:00 2001
From: Amir Ayupov <aaupov at fb.com>
Date: Wed, 15 May 2024 11:11:29 -0700
Subject: [PATCH] [BOLT][NFC] Don't assign YAML profile to functions with no
 CFG

YAML profile for non-simple functions without CFG is
  1) useless for optimizations,
  2) can't be attached, similar to fdata profile,
  3) would be reported as invalid/stale even if the profile is valid.

Don't attempt to attach the profile in this case, aligning the behavior
to DataReader.
---
 bolt/lib/Profile/YAMLProfileReader.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bolt/lib/Profile/YAMLProfileReader.cpp b/bolt/lib/Profile/YAMLProfileReader.cpp
index 978a7cadfe798..29d94067f459f 100644
--- a/bolt/lib/Profile/YAMLProfileReader.cpp
+++ b/bolt/lib/Profile/YAMLProfileReader.cpp
@@ -99,6 +99,9 @@ bool YAMLProfileReader::parseFunctionProfile(
       FuncRawBranchCount += YamlSI.Count;
   BF.setRawBranchCount(FuncRawBranchCount);
 
+  if (BF.empty())
+    return true;
+
   if (!opts::IgnoreHash &&
       YamlBF.Hash != BF.computeHash(IsDFSOrder, HashFunction)) {
     if (opts::Verbosity >= 1)