autovectorizer doesn't support multistep widen mult

[Richard Biener]

On Fri, Jan 25, 2013 at 4:13 PM, Paulo Matos <pmatos@broadcom.com> wrote:
> Hello,
>
> Is there any technical reason (besides nobody bothers to implement it) why GCC doesn't support multistep conversions for widen mult?

No.

> In tree-vect-stmts.c:
>   /* Check if it's a multi-step conversion that can be done using intermediate
>      types.  */
>
>   prev_type = vectype;
>   prev_mode = vec_mode;
>
>   if (!CONVERT_EXPR_CODE_P (code))
>     return false;
>
> Is there any reason we only proceed for convert expr codes?

Because others are not a conversion?!

> Thanks,
>
> Paulo Matos
>
>