[LLVMdev] Simple NEON optimization

[Evan Cheng]

Is this related to Owen's patch r118453?

Evan

On Nov 12, 2010, at 10:42 AM, Renato Golin wrote:

> On 12 November 2010 17:52, Bob Wilson <bob.wilson at apple.com> wrote:
>> I recommend implementing this as a target-specific DAG combine optimization.  We already have target-specific DAG nodes for the relevant NEON comparison operations (ARMISD::VCEQ, etc. -- see ARMISelLowering.h) as well as the vmov (ARMISD::VMOVIMM).  You just need to teach the DAG combiner how to fold them together.  Here's what you need to do (all of this code is in ARMISelLowering.cpp):
> 
> Hi Bob,
> 
> I thought so... I'll get cracked and see if I can generate some simple tests.
> 
> Thank you very much for the detailed explanation!
> 
> cheers,
> --renato
> 
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