What risc-v board do you have?
ARM has neon delegate:

  
      

      TensorFlow
  

  
    

TensorFlow Lite Delegates



  

  
    
    
  

  


In the new MLIR compiler stack they are working on:

  
      

      LLVM Discussion Forums – 23 Aug 21
  

  
    

[RFC] Add RISC-V Vector Extension (RVV) Dialect 2

  Hi,  I am writing to propose a RISC-V Vector extension (RVV) dialect. The RISC-V vector extension v1.0 candidate has been released. Currently, LLVM supports the stable release v0.10. RVV is rapidly emerging, I think applications and optimizations...

  
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