[LLVMdev] Enabling the SLP-vectorizer by default for -O3

[Jim Grosbach]

On Jul 29, 2013, at 11:23 AM, Nadav Rotem <nrotem at apple.com> wrote:

> 
> On Jul 28, 2013, at 12:20 AM, Chandler Carruth <chandlerc at google.com> wrote:
> 
>> That said, why -O3? I think we should just enable this across the board, as it doesn't seem to cause any size regression under any mode, and the compile time hit is really low.
> 
> 
> I agree.  I think that it would be a good idea to enable it for -Os and -O2, but I’d like to make one step at a time. 
> 

These results are really excellent. They’re on Intel, I assume, right? What do the ARM numbers look like? Before enabling by default, we should make sure that the results are comparable there as well.

-JIm


> Thanks,
> Nadav
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