[LLVMdev] Modeling GPU vector registers, again (with my implementation)

[Alex]

Evan Cheng-2 wrote:
> 
> Well, how many possible permutations are there? Is it possible to  
> model each case as a separate physical register?
> 
> Evan
> 

I don't think so. There are 4x4x4x4 = 256 permutations. For example:

* xyzw: default
* zxyw
* yyyy: splat

Even if can model each of these 256 cases as a separate physical register,
how can I model the use of r0.xyzw in the following example:

// dp4 = dot product 4-element
dp4 r0.x, r1, r2
dp4 r0.y, r3, r4
dp4 r0.z, r5, r6
dp4 r0.w, r7, r8
sub r5, r0.xyzw, r6


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