Function _mm_cmpestrs

pub fn _mm_cmpestrs<const IMM8: i32>(
    a: __m128i,
    la: i32,
    b: __m128i,
    lb: i32,
) -> i32

Compares packed strings in a and b with lengths la and lb using the control in IMM8, and return 1 if any character in a was null, and 0 otherwise.

Intel’s documentation