How to use CoopVectors with hlsl target

[geri1245]

Hi,
I would like to use CoopVectors using the hlsl target with slang (unfortunately I need hlsl for reasons, can't compile straight to dxil for example). So for slangc I have -target hlsl and -capability sm_6_9 and -capability hlsl_coopvec_poc_sm_6_9. When I try to compile the generated hlsl code with latest dxc (link), I am getting some errors related to CoopVectors - seems like the generated code is not correct hlsl.

For example:

slang code:
CoopVec<float, 7> val = {0.1234, 0.2, ...};
...
float someValue = val[1];

generated hlsl:
CoopVector<float, 7> val;
val.WriteToIndex(0, 0.1234);
val.WriteToIndex(1, 0.2);
...
val.ReadFromIndex(1);

Based on the spec/proposal, element access for read and write should be done using operator[] and not ReadFromIndex or WriteToIndex, these result in an error. And there are some other errors that I encounter:

Invalid swizzle OP on vector of over 4 elements

where OP is one of the following: CopyFrom, MatMulAdd, Fill.

Can someone please advise, if it's me doing something wrong or compiling slang to hlsl using CoopVectors is not yet supported? Thanks!

[jkwak-work]

Please do not use "poc", which stands for proof-of-concept, which was a prototype NVIDIA had for a short time period until DXC standardized it.

Just -capability sm_6_9 should be enough to use CoopVec.

[geri1245]

Thank you, using simply sm_6_9 generates correct hlsl for CoopVectors!