[RFC, vectorizer] Allow single element vector types for vector reduction operations

[Richard Biener]

On September 7, 2017 1:20:13 PM GMT+02:00, Jon Beniston <jon@beniston.com> wrote:
>Hi Bernd,
>
>>This seems to ring a bell. I think I submitted a patch for this here 
>>- is this the same problem?
>>https://gcc.gnu.org/ml/gcc-patches/2010-12/msg01724.html
>
>Looks like it.

Looks my suggestion was exactly what we have now. Note I didn't yet manage to do minimal surgery to vector lowering to fix the ARM fallout... 

Richard. 

>Cheers,
>Jon