https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118175
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2024-12-23
Ever confirmed|0 |1
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Huaqi from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > Looks like an alias issue.
> > Changing the matrix definitions to:
> > extern float matA[], matB[], matC[];
> >
> >
> > Allows GCC to vectorize the loop even for x86_64.
>
> Yes, it works. But when I changed the function name to void *
> CalculaProdutoMatriz(float *matA, float *matB, float *matC, void *arg), then
> it still not work, I expected it may work, since I think it just similiar to
> what you suggested.
If you add restrict the arguments, GCC will also vectorizer. Again this is an
aliasing issue.
