https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102767
Kewen Lin <linkw at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |linkw at gcc dot gnu.org
--- Comment #9 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #8)
> the backend says it can support misaligned V1TI via
> rs6000_builtin_support_vector_misalignment:
>
> rs6000_builtin_support_vector_misalignment (mode=E_V1TImode,
> type=<integer_type 0x7ffff66f41f8>,
> misalignment=8, is_packed=false) at
> ../../src/trunk/gcc/config/rs6000/rs6000.c:5069
> ...
> /* VSX supports word-aligned vector. */
> if (misalignment % 4 == 0)
> return true;
>
> so the vectorizer classifies it as dr_unaligned_supported and we of course
> are then allowed to cost the supported unaligned store but the cost
> hook doesn't consider elements == 1.
>
> Now, we probably should avoid 1-lane vector vectorization in BB vect but
> that's
> a different story.
Yes, it's inconsistent between the hook and costing query. I'll make a patch.
