[PATCH] X86: fold SSE2/AVX2 logical shift by immediate amout into zero vector when possible

[Andrea_DiBiagio at sn.scee.net]

Hi,
I attached the patch against the most recent tot.
Could you please commit this patch for me? (I have no commit access)

Thanks,
Andrea Di Biagio
SN Systems - Sony Computer Entertainment Group



> From: Andrea DiBiagio/SN R&D/BS/UK/SCEE
> > From: Nadav Rotem <nrotem at apple.com>
> > These vectors with these constants can be generated during 
> > legalization.  But it’s not a big deal and we can do without it. 
> > 
> 
> True..
> 
> > The behavior of shifts by amount larger than the element size is 
defined 
> > for x86 SSE2/AVX2.
> > 
> > Yes, but we are looking at the semantics of the llvm SelectionDAG, 
> > and we want to lower it to x86.  :)
> > 
> > In any case, this is correct and I don’t see any reason not to 
> > commit the patch as is. 
> 
> Thanks.
> Btw. I have no commit access to the repository.
> Could (any of) you please commit this change for me? :-)
> 
> Andrea Di Biagio
> SN Systems - Sony Computer Entertainment Group


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