pcmpestrm.rs

use std::arch::x86_64 as S;

fn main() {
    let data: &[u8; 16] = b"1e0b98cfa67ebe20";
    let pattern: &[u8; 16] = b"b98.............";

    let mask;

    unsafe {
        let v0 = S::_mm_loadu_si128(data.as_ptr().cast());
        let v1 = S::_mm_loadu_si128(pattern.as_ptr().cast());

        let m1 = S::_mm_cmpestrm(v1, 3, v0, 16, S::_SIDD_CMP_EQUAL_ORDERED);
        mask = S::_mm_extract_epi16(m1, 0) as u16;
    }

    let trailing_zeros = mask.trailing_zeros() as usize;

    println!("m = {:016b}", mask);
    println!("match = {:?}", std::str::from_utf8(&data[trailing_zeros..]));
}