[llvm] [AIX] Set memrchr to unavailable (PR #92588)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Qiongsi Wu (qiongsiwu)

<details>
<summary>Changes</summary>

`memrchr` is not available on AIX. This patch turns it off so the optimizer will not generate it to cause link errors. 

---
Full diff: https://github.com/llvm/llvm-project/pull/92588.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/TargetLibraryInfo.cpp (+3) 


``````````diff
diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index 7ce42447b6308..592caf2d0e23a 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -882,6 +882,9 @@ static void initializeLibCalls(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setUnavailable(LibFunc_vec_free);
   }
 
+  if (T.isOSAIX())
+    TLI.setUnavailable(LibFunc_memrchr);
+
   TLI.addVectorizableFunctionsFromVecLib(ClVectorLibrary, T);
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/92588