https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102404
--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #5)
> (In reply to Freddie Witherden from comment #4)
> > Created attachment 51485 [details]
> > Clang assembly.
>
> It seems to be because the current GCC loop vectorizer does not support
> different vector sizes, and here the index vector is 256bit. Change
> tripcount to 16 successfully generate zmm.
Define index type from const int* to const long long * also can generate zmm.
.i.e.
void intcflux(int _nx, const double* __restrict__ magnl_v, const double*
__restrict__ nl_v, double* __restrict__ ul_v, const long long* __restrict__
ul_vix, double* __restrict__ ur_v, const long long* __restrict__ ur_vix)
{
