https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109276
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Reduced testcase: /* PR target/109276 */ /* { dg-do compile } */ /* { dg-options "-march=x86-64" } */ /* { dg-additional-options "-mpreferred-stack-boundary=2" } */ long long a; long double b; void foo (void) { b += a; }