[LLVMdev] Vector code

[B. Scott Michel]

 From the cellspu's test harnesses:


define <4 x float> @fp_add_vec(<4 x float> %arg1, <4 x float> %arg2) {
%A = add <4 x float> %arg1, %arg2
ret <4 x float> %A
}

It's a simple vector add for two v4f32 quantities. There are things you 
need to do in order to make the optimizer not optimize, e.g.:

v4f32 fp_add_vec(v4f32 arg1, v4f32 arg2) {
return arg1 + arg2;
}

Hope this helps.


-scooter

Nicolas Capens wrote:
>
> Hi all,
>
> I’m trying to use LLVM to generate SIMD code at runtime (in particular 
> Intel SSE). But I’m having a bit of trouble understanding how to 
> create even the simplest function; adding two vectors of four 
> single-precision floating-point elements. I can get it to add the 
> elements one at a time but not using one vector instruction.
>
> All help much appreciated!
>
> Nicolas Capens
>
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