SLP/Loop vectorizer pass ordering

[Chandler Carruth]

On Wed, Aug 6, 2014 at 2:37 AM, James Molloy <james at jamesmolloy.co.uk>
wrote:

> Hi Hal,
>
> I ran some numbers on Cortex-A57 (AArch64 mode) with the SLP and Loop
> vectorizers swapped and with your noalias metadata enabled. I see no change
> outside of noise. I ran SPEC(2000+2006) and EEMBC - LNT is currently
> unusable on our hardware due to lack of "perf" - it's just too noisy :(
>
> Can someone try a test on x86? If that shows the same, we should be in a
> good position to swap the ordering as soon as you enable noalias metadata
> by default.
>

Can you set everything up so that there is a flag that makes this switch?
Or is there already one I missed?

Once I have flags, its easy for me to test. I can test both just the AA
metadata, and then AA metadata + vectorize rearrangement.
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