[clang] [llvm] [RISCV] Add SpacemiT XSMTVDot (SpacemiT Vector Dot Product) extension. (PR #151706)

[via llvm-commits]

link-xyq wrote:

For detailed instruction definitions and programming model specifications, please refer to:  
https://github.com/space-mit/riscv-ime-extension-spec/releases/tag/v0429  

** Note **:  
The spacemit-x60 processor currently supports the following subset of this extension:  
- Integer dot-product matrix multiply-accumulate (int8 type)  
- Integer sliding-window dot-product matrix multiply-accumulate (int8 type)  

https://github.com/llvm/llvm-project/pull/151706