It's a Rust/ASM port, look there: https://github.com/memorysafety/rav1d/blob/main/src/ext/x86/x86inc.asm https://github.com/memorysafety/rav1d/blob/main/src/ext

It's a Rust/ASM port, look there: https://github.com/memorysafety/rav1d/blob/main/src/ext/x86/x86inc.asm https://github.com/memorysafety/rav1d/blob/main/src/ext/x86/... I am not sure if it is that much safer than the C version when raw assembly is still required.