[llvm] [SampleFDO] Stale profile call-graph matching (PR #95135)

[Lei Wang via llvm-commits]

================
@@ -127,8 +143,43 @@ void SampleProfileMatcher::findProfileAnchors(const FunctionSamples &FS,
   }
 }
 
-LocToLocMap SampleProfileMatcher::longestCommonSequence(
-    const AnchorList &AnchorList1, const AnchorList &AnchorList2) const {
+Function *
+SampleProfileMatcher::findIfFunctionIsNew(const FunctionId &IRFuncName) {
+  auto R = NewIRFunctions.find(IRFuncName);
+  if (R == NewIRFunctions.end())
+    return nullptr;
+  return R->second;
+}
+
+bool SampleProfileMatcher::isProfileUnused(const FunctionId &ProfileFuncName) {
+  auto F = SymbolMap->find(ProfileFuncName);
+  return F == SymbolMap->end();
+}
+
+bool SampleProfileMatcher::functionMatchesProfile(
+    const FunctionId &IRFuncName, const FunctionId &ProfileFuncName,
+    bool FindMatchedProfileOnly) {
+  if (IRFuncName == ProfileFuncName)
+    return true;
+  if (!SalvageUnusedProfile)
+    return false;
+
+  // If IR function doesn't have profile and the profile is unused, try
+  // matching them.
+  Function *IRFunc = findIfFunctionIsNew(IRFuncName);
----------------
wlei-llvm wrote:

Sounds good. Will change 
`findNewIRFunctions ` -> `findFunctionsWithoutProfile`
`findIfFunctionIsNew ` -> `functionHasProfile`
Thanks for the suggestion!

https://github.com/llvm/llvm-project/pull/95135