https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81196
--- Comment #6 from amker at gcc dot gnu.org ---
(In reply to Marc Glisse from comment #5)
> (In reply to amker from comment #4)
> > Hmm, the function can only be vectorized with "-march=skylake"?
>
> Er, it also vectorizes without any -march on x86_64 (with shorter vectors).
But below is necessary, right?
/* { dg-require-effective-target vect_perm_short } */
Otherwise I get:
pr81196.c:7:3: note: negative step and reversing not supported.
pr81196.c:7:3: note: not falling back to elementwise accesses
pr81196.c:7:3: note: not vectorized: relevant stmt not supported: _1 = *q_18;
pr81196.c:7:3: note: bad operation or unsupported loop bound.
pr81196.c:4:6: note: vectorized 0 loops in function.
Thanks
