[LLVMdev] [llvm-commits] Vectors of Pointers and Vector-GEP

[Rotem, Nadav]

I agree that a single vector index is sufficient for many cases. Matt Pharr (from the ISPC compiler), showed me an interesting case where there is a single pointer into an array. In this case we need to have two indices, where the first index is zero. Once the basic patch is in, we can start looking at adding support for arrays and multiple indices. 

Nadav

-----Original Message-----
From: David A. Greene [mailto:greened at obbligato.org] 
Sent: Tuesday, November 29, 2011 18:17
To: Rotem, Nadav
Cc: David A. Greene; LLVM Developers Mailing List
Subject: Re: [llvm-commits] Vectors of Pointers and Vector-GEP

"Rotem, Nadav" <nadav.rotem at intel.com> writes:

> David, 
>
> Thanks for the support! I sent a detailed email with the overall
> plan. But just to reiterate, the GEP would look like this:
>
> 	%PV = getelementptr <4 x i32*> %base, <4 x i32> <i32 1, i32 2, i32 3, i32 4>
>
> Where the index of the GEP is a vector of indices. I am not against
> having multiple indices. I just want to start with a basic set of
> features.

Ah, I see.  I actually think multiple indices as in multiple vectors of
indices to the GEP above would be pretty rare.

                             -Dave
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