[PATCH] Improve performance of vector code on A15

[Jakob Stoklund Olesen]

On Mar 14, 2013, at 5:24 AM, "Silviu Baranga" <silbar01 at arm.com> wrote:

> I'm attaching a new version of the A15 neon optimization patch
> with the following improvements:
> 
> - we now always check if a register is virtual before
> calling getVRegDef.
> 
> - the elideCopiesAndPHIs method previously had a chance to
> enter in an infinite recursion since it also looks past PHI nodes.
> I've fixed that by using a DFS instead.
> 
> - disabled VMOVS widening on A15 since it was not working well with
> the optimization pass.
> 
> I've also tested the patch using the LNT testsuite and didn't get
> any failures (except the ones that we already know about and were
> already failing without the patch).
> 
> Would this be close to a state where it can get committed?

Looks good, except you should have to run DCE again. This doesn't seem like something that needs to create dead code.

/jakob

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