I checked the zstd source and i'm surprised to see you're right - There's a little x86_64 assembly but I don't see a single SIMD instruction anywhere, and no i

I checked the zstd source and i'm surprised to see you're right - There's a little x86_64 assembly but I don't see a single SIMD instruction anywhere, and no intrinsics neither. Seems like brotli is the same. I assume zstd still gains something from SIMD autovectorization in the compiler, that might be interesting to benchmark with- and without- such a flag. Since the zstd bytestream got frozen in RFC8478, messing with the layout too much will require a zstd2 and moving the whole world again to use it (linux kernel compression, rpm binary format, etc)