[wwwdocs] Vectorizer's updates to 4.3.0 changes

[Andrew Pinski]

Sent from my iPhone

On Mar 11, 2008, at 3:41, Andi Kleen <andi@firstfloor.org> wrote:

>> +     <li>The <code>-ftree-vectorize</code> option is now on by  
>> default
>> under
>> +     <code>-O3</code>.
>
> That seems awfully brief. I would recommend you mention at least
> e.g. that it needs sse2 or altivec enabled and roughly what the
> vectorizer does (in very high level terms for users) and that it may
> increase code size.

On some targets (SPU), you don't need an extra option to enable the  
ability for vectorizer. And it is already documented that -O3 can  
cause inrease of code size.

Thanks,
Andrew Pinski