xuantie-gnu-toolchain

I've been using the one archived by bruce hoult: https://github.com/brucehoult/riscv-gnu-toolchain It doesn't support autovectorization though. Together with some assembly macros to allow writing in a subset of rvv 1.0 that also works on rvv 0.7.1 (source compatible, but not binary compatible. [0] There is also the xuantie toolchain that does support intrinsic and some sort of autovectorization, I think. But I haven't used that one, and it won't be as good as upstream gcc/llvm. [1] [0] https://github.com/camel-cdr/rvv-bench/blob/main/thirdparty/... [1] https://github.com/T-head-Semi/xuantie-gnu-toolchain

My repo is relatively old, gcc 9.2.0. Not that there's anything much wrong with gcc from August 2019! I've been using gcc since 2002. THead have a newer version based on gcc 10.2.0. https://github.com/T-head-Semi/xuantie-gnu-toolchain But it doesn't really matter. There is no support in the C language for RVV 0.7.1, you just have to write either plain assembly language or inline asm for your RVV code. Which means you need a binutils that supports RVV 0.7.1 to assemble your vector code, but you can compile the rest of your program with the latest upstream gcc. Then you can link the .o files. Note that even though there is support for RVV 1.0 "intrinsic functions" in C compilers, SiFive just submitted RVV 1.0 support for FFmpeg and it's written in pure assembly language. https://ffmpeg.org/pipermail/ffmpeg-devel/2023-May/309722.ht...