diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index a103f7296f55ce09ae68c85610d4098c3a88e26f..08209277832e1034cc4e1fa6c2f38143e5fd75a3 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -174,7 +174,11 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setAvailable(LibFunc_getchar_unlocked);
     TLI.setAvailable(LibFunc_putc_unlocked);
     TLI.setAvailable(LibFunc_putchar_unlocked);
-    TLI.setUnavailable(LibFunc_memrchr); // OHOS_LOCAL TODO
+
+    // OHOS_LOCAL begin
+    // memrchr is not implemented in macOS libc
+    TLI.setUnavailable(LibFunc_memrchr);
+    // OHOS_LOCAL end
 
     if (T.isMacOSXVersionLT(10, 5)) {
       TLI.setUnavailable(LibFunc_memset_pattern4);