[clang] [llvm] [Inliner] Propagate more attributes to params when inlining (PR #91101)

[Nikita Popov via cfe-commits]

================
@@ -1391,22 +1412,65 @@ static void AddParamAndFnBasicAttributes(const CallBase &CB,
 
       AttributeList AL = NewInnerCB->getAttributes();
       for (unsigned I = 0, E = InnerCB->arg_size(); I < E; ++I) {
-        // Check if the underlying value for the parameter is an argument.
-        const Value *UnderlyingV =
-            getUnderlyingObject(InnerCB->getArgOperand(I));
-        const Argument *Arg = dyn_cast<Argument>(UnderlyingV);
-        if (!Arg)
+        // It's unsound or requires special handling to propagate attributes to
+        // byval arguments. For reach even if CalledFunction doesn't e.g. write
----------------
nikic wrote:

For reach?

https://github.com/llvm/llvm-project/pull/91101