[llvm] [BOLT] Extend Inliner to work on functions with Pointer Autentication (PR #162458)

[Gergely Bálint via llvm-commits]

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@@ -338,6 +345,17 @@ Inliner::inlineCall(BinaryBasicBlock &CallerBB,
                                 BC.Ctx.get());
       }
 
+      // Handling fused authentication and return instructions (Armv8.3-A):
+      // if the Return here is RETA(A|B), we have to keep the authentication
+      // part.
+      // RETAA -> AUTIASP + RET
+      // RETAB -> AUTIBSP + RET
+      if (BC.isAArch64() && BC.MIB->isPAuthAndRet(Inst)) {
+        MCInst Auth;
+        BC.MIB->createMatchingAuth(Inst, Auth);
+        InsertII =
+            std::next(InlinedBB->insertInstruction(InsertII, std::move(Auth)));
+      }
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bgergely0 wrote:

> Oh I see I'm late to the party there

I believe that's independent of this. There we look at tailcalls in the "Inlinee" block, and here the problem is if the tailcall is in the Caller. 

https://github.com/llvm/llvm-project/pull/162458