Disable vectorization on pre SSE2

[Reid Kleckner]

Make it so!


On Wed, Mar 5, 2014 at 9:40 AM, Eric Christopher <echristo at gmail.com> wrote:

> No objections here, SSE2 has been around "roughly forever" at this point.
>
> -eric
>
> On Wed, Mar 5, 2014 at 9:02 AM, 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.
> >
> >
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> >
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