[llvm-dev] [cfe-dev] RFC: First-class Matrix type (original) (raw)

Adam Nemet via llvm-dev llvm-dev at lists.llvm.org
Thu Oct 11 15:12:26 PDT 2018

On Oct 11, 2018, at 7:56 AM, David Greene <dag at cray.com> wrote:

Adam Nemet via cfe-dev <cfe-dev at lists.llvm.org> writes:

%0 = load <4 x 4 x float>, <4 x 4 x float>* %a, align 16 %1 = load <4 x 4 x float>, <4 x 4 x float>* %b, align 16 %2 = call <4 x 4 x float> @llvm.matrix.multiply.m44f32.m44f32.m44f32(<4 x 4 x float> %0, <4 x 4 x float> %1) store <4 x 4 x float> %2, <4 x 4 x float>* %c, align 16 This sounds very interesting. Would it make sense to later expand the idea to allow an arbitrary number of dimensions? Maybe that doesn't make sense if we're restricted to statically-known dimensions.

Yes, that matches my current feeling too.

How would this relate to scalable vectors?

Scalable vectors would be a possible of lowering of the matrix type. I believe you'd need go generate loops or at least some conditional code at run time due to the unknown scale factor.

Most of the time matrix dimensions are not known statically. Would be possible?

No, we only support statically-known dimensions.

Do you have a prototype of this?

Yes. I can make it available it there is interest.

Adam

-David

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