https://blog.csdn.net/u011011827/article/details/119185091 https://blog.csdn.net/weixin_39871788
https://github.com/sifive/riscv-llvm
https://www.youtube.com/watch?v=EagsCYX5zoA
https://github.com/riscv-software-src/riscv-tests https://riscv.org/wp-content/uploads/2015/01/riscv-software-toolchain-workshop-jan2015.pdf RISC-V + OpenMP