Disable vectorization on pre SSE2

[Chandler Carruth]

The bugs issue actually bothers me here.

I'm really alarmed that we're papering over an inability to scalarize
vector code. I think that's a bad sign.

Should the vectorizer produce it? No, because its slow.

Should the backend be able to handle it? *Yes*, and it is worth some amount
of pain to try to ensure this is the case.


On Wed, Mar 5, 2014 at 11:45 AM, Benjamin Kramer <benny.kra at gmail.com>wrote:

>
> On 05.03.2014, at 18:02, Arnold Schwaighofer <aschwaighofer at apple.com>
> wrote:
>
> > Hi all,
> >
> > does anyone have objections against disabling vectorization on pre SSE2
> architectures. I don’t think we have bots testing this and so bugs are
> likely (see PR18036). We fail in isel for a simple vector select.
>
> This is the right thing to do, getting the bugs fixed would also be a good
> thing :)
>
> - Ben
>
>
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