> Why can’t the kernel implementation use AVX? Well, if it did, then it would have to save and restore those registers on each system call, and that would make domain crossing even more expensive. So this was a conscious decision in the Linux kernel.
I don't follow. So a syscall that could profit from AVX can't use it because then all syscalls would have to restore AVX registers? Why can't the restoring just happen specifically in those syscalls that make use of AVX?
I don't follow. So a syscall that could profit from AVX can't use it because then all syscalls would have to restore AVX registers? Why can't the restoring just happen specifically in those syscalls that make use of AVX?