--- a/clang/test/Sema/attr-regparm.c	Wed Jul 21 10:27:27 2021 +0900
+++ b/clang/test/Sema/attr-regparm.c	Wed Nov 09 17:45:10 2022 +0900
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple i386-apple-darwin9 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple i386-apple-darwin9 -fsyntax-only -fdouble-square-bracket-attributes -verify %s
 
 __attribute((regparm(2))) int x0(void);
 __attribute((regparm(1.0))) int x1(void); // expected-error{{'regparm' attribute requires an integer constant}}
@@ -9,3 +9,9 @@
 void __attribute__((regparm(3))) x5(int);
 void x5(int); // expected-note{{previous declaration is here}}
 void __attribute__((regparm(2))) x5(int); // expected-error{{function declared with regparm(2) attribute was previously declared with the regparm(3) attribute}}
+
+[[gnu::regparm(3)]] void x6(int); // expected-note{{previous declaration is here}}
+[[gnu::regparm(2)]] void x6(int); // expected-error{{function declared with regparm(2) attribute was previously declared with the regparm(3) attribute}}
+void x6 [[gnu::regparm(3)]] (int);
+void [[gnu::regparm(3)]] x6(int); // expected-warning{{'regparm' only applies to function types; type here is 'void'}}
+void x6(int) [[gnu::regparm(3)]]; // expected-warning{{GCC does not allow the 'regparm' attribute to be written on a type}}