fix void and empty struct ret

ZuseZ4 · ZuseZ4 · commit 98d754d705ad · 2025-09-30T17:56:12.000-04:00
diff --git a/compiler/rustc_codegen_llvm/src/builder/autodiff.rs b/compiler/rustc_codegen_llvm/src/builder/autodiff.rs
@@ -378,5 +378,9 @@ pub(crate) fn generate_enzyme_call<'ll, 'tcx>(
 
     let call = builder.call(enzyme_ty, None, None, ad_fn, &args, None, None);
 
-    builder.store_to_place(call, dest.val);
+    let fn_ret_ty = builder.cx.val_ty(call);
+    if fn_ret_ty != builder.cx.type_void() &&
+        fn_ret_ty != builder.cx.type_struct(&[], false) {
+        builder.store_to_place(call, dest.val);
+    }
 }

Original file line number	Diff line number	Diff line change
`@@ -378,5 +378,9 @@ pub(crate) fn generate_enzyme_call<'ll, 'tcx>(`
`378`	`378`
`379`	`379`	`let call = builder.call(enzyme_ty, None, None, ad_fn, &args, None, None);`
`380`	`380`
`381`		`- builder.store_to_place(call, dest.val);`
	`381`	`+ let fn_ret_ty = builder.cx.val_ty(call);`
	`382`	`+ if fn_ret_ty != builder.cx.type_void() &&`
	`383`	`+ fn_ret_ty != builder.cx.type_struct(&[], false) {`
	`384`	`+ builder.store_to_place(call, dest.val);`
	`385`	`+ }`
`382`	`386`	`}`