[PATCH][LoopVectorizer] Enable fsub reductions

[Arnold Schwaighofer]

> On Aug 7, 2014, at 1:14 PM, James Molloy <James.Molloy at arm.com> wrote:
> 
> Hi Arnold,
>  
> The attached patch enables floating-point subtraction reductions in fast-math mode.
>  
> I’m not sure why it wasn’t enabled before – the logic seems sound and I can’t find any FP math pitfalls.

I can’t see a reason either. LGTM.


> This, coupled with making the loop vectorizer run before SLP, should give us about 10% in sphinx3 in SPEC.

Very nice!
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