https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104723
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> --- update testcase void f256(char *a) { char t[] = "012345678901234567890123456789012345678901234567"; __builtin_memcpy(a, &t[0], sizeof(t)); }