[clang] [llvm] [clang][CodeGen][AA] Introduce `!llvm.errno.tbaa` for errno alias disambiguation (PR #125258)

[Nikita Popov via cfe-commits]

================
@@ -385,6 +386,20 @@ AliasResult TypeBasedAAResult::alias(const MemoryLocation 
&LocA,
   return AliasResult::NoAlias;
 }
 
+AliasResult TypeBasedAAResult::aliasErrno(const MemoryLocation &Loc,
+                                          const Module *M) {
+  if (!shouldUseTBAA())
+    return AliasResult::MayAlias;
+
+  const auto *ErrnoTBAAMD = M->getNamedMetadata("llvm.errno.tbaa");
----------------
nikic wrote:

Avoid lookup if we don't have TBAA in the first place.

https://github.com/llvm/llvm-project/pull/125258
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits