https://doc.rust-lang.org/stable/core/arch/x86_64/fn._mm_cmpistrc.html
_mm_cmpistrc in core::arch::x86_64 - Rust
Compares packed strings with implicit lengths in `a` and `b` using the control in `IMM8`, and return `1` if the resulting mask was non-zero, and `0` otherwise.
mmcorearchrust