Where did the machine code (like JvmciCode::MATRIX4D_MUL_AVX_LINUX) come from? Git history seems to blame it on a massive refactor commit - I can't trace it farther back than that, and there doesn't seem to be any documentation for how it was produced. While it doesn't seem meant for production, I was trying to do something similar for a hobby project and was wondering whether this was entirely hand-made or if it was compiled from some slightly higher-level source like C.