https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79904
--- Comment #2 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Reduced test:
--
typedef signed char V __attribute__((vector_size (8)));
void foo (V *a)
{
*a = *a * 3;
}
--
$ gcc -fsanitize=undefined ...
