[PATCH][LoopVectorizer] Enable fsub reductions

[James Molloy]

Thanks Arnold,

 

Committed in r215200.

 

Cheers,

 

James

 

From: Arnold Schwaighofer [mailto:aschwaighofer at apple.com] 
Sent: 08 August 2014 01:21
To: James Molloy
Cc: llvm-commits
Subject: Re: [PATCH][LoopVectorizer] Enable fsub reductions

 

 

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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