构建RISC-V矩阵扩展llvm后端：

在主目录下mkdir build && cd build
cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON ../llvm -DLLVM_ENABLE_PROJECTS=”clang” -DLLVM_TARGETS_TO_BUILD=”host;RISCV”
ninja -j12 (具体数值由虚拟机核心数决定)

将.ll文件转为RISC-V汇编.s文件：

~/path/to/build/bin/llc yourfile.ll -mtriple=riscv64 -mattr=+xxiangshaname -o yourfile.s

4.示例代码： build/bin/clang
-target riscv64-unknown-elf
-march=rv64gcv_xxiangshaname
-mabi=lp64d
-menable-experimental-extensions
-c /path/to/file.c -o /path/to/file.o

xxiangshaname为matrix扩展指令集

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