Rename tests/codegen into tests/codegen-llvm

tests/codegen-llvm/function-return.rs

@@ -0,0 +1,35 @@
+// Test that the `fn_ret_thunk_extern` function attribute is (not) emitted when
+// the `-Zfunction-return={keep,thunk-extern}` flag is (not) set.
+
+//@ add-core-stubs
+//@ revisions: unset keep thunk-extern keep-thunk-extern thunk-extern-keep
+//@ needs-llvm-components: x86
+//@ compile-flags: --target x86_64-unknown-linux-gnu
+//@ [keep] compile-flags: -Zfunction-return=keep
+//@ [thunk-extern] compile-flags: -Zfunction-return=thunk-extern
+//@ [keep-thunk-extern] compile-flags: -Zfunction-return=keep -Zfunction-return=thunk-extern
+//@ [thunk-extern-keep] compile-flags: -Zfunction-return=thunk-extern -Zfunction-return=keep
+
+#![crate_type = "lib"]
+#![feature(no_core, lang_items)]
+#![no_core]
+
+extern crate minicore;
+use minicore::*;
+
+#[no_mangle]
+pub fn foo() {
+    // CHECK: @foo() unnamed_addr #0
+
+    // unset-NOT: fn_ret_thunk_extern
+    // keep-NOT: fn_ret_thunk_extern
+    // thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
+    // keep-thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
+    // thunk-extern-keep-NOT: fn_ret_thunk_extern
+}
+
+// unset-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// keep-thunk-extern: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}
+// thunk-extern-keep-NOT: !{{[0-9]+}} = !{i32 4, !"function_return_thunk_extern", i32 1}