Experiment: Don't merge vtables.

rust-lang · Oct 25, 2022 · 0247c6a · 0247c6a
1 parent 31d754a
commit 0247c6a
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs
@@ -241,7 +241,14 @@ impl<'ll> CodegenCx<'ll, '_> {
             };
             llvm::LLVMSetInitializer(gv, cv);
             set_global_alignment(self, gv, align);
-            llvm::SetUnnamedAddress(gv, llvm::UnnamedAddr::Global);
+
+            // Experiment: What's the impact of making vtables unmergable?
+            if kind == Some("vtable") {
+                llvm::SetUnnamedAddress(gv, llvm::UnnamedAddr::No);
+            } else {
+                llvm::SetUnnamedAddress(gv, llvm::UnnamedAddr::Global);
+            }
+
             gv
         }
     }