[Bug target/106910] roundss not vectorized

["rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106910

--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 15 Sep 2022, crazylht at gmail dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106910
> 
> --- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
> 
> > The vectorizer would go the direct internal fn way for those, querying the
> > floor optab but the x86 backend only has scalar modes supported for the
> > rounding optabs.
> For CFN_BUILT_IN_ICEIL, the modifier is narrow, and currently vectorizable_call
> require op_in and op_out to be simple_integer_narrowing, which means it fails
> to go the direct internal fn way.
> 
> ---------cut from vectorizable_call-----------
>   tree_code convert_code = ERROR_MARK;
>   if (cfn != CFN_LAST
>       && (modifier == NONE
>           || (modifier == NARROW
>               && simple_integer_narrowing (vectype_out, vectype_in,
>                                            &convert_code))))
>     ifn = vectorizable_internal_function (cfn, callee, vectype_out,
>                                           vectype_in);
> -----------cut end----------------------
> 
> Similar for CFN_BUILT_IN_LCEIL under 32-bit target.
> For 64-bit target CFN_BUILT_IN_LCEIL, CFN_BUILT_IN_LLCEIL will go the direct
> internal fn way, add lceilmn2 expanders works.
> 
> Not sure whether vectorizable_call should be extended or just leave
> CFN_BUILT_IN_ICEIL/IFLOOR/IRINT/IROUND part in
> ix86_builtin_vectorized_function.

I think this is a known issue (we may even have a bugreport) so I'd
leave handling of those cases in ix86_builtin_vectorized_function.