小编kal*_*ali的帖子

此代码在调试模式下工作,但由于在释放模式下断言而导致混乱.

use std::arch::x86_64::*;

fn main() {
    unsafe {
        let a = vec![2.0f32, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0];
        let b = -1.0f32;

        let ar = _mm256_loadu_ps(a.as_ptr());
        println!("ar: {:?}", ar);

        let br = _mm256_set1_ps(b);
        println!("br: {:?}", br);

        let mut abr = _mm256_setzero_ps();
        println!("abr: {:?}", abr);

        abr = _mm256_fmadd_ps(ar, br, abr);
        println!("abr: {:?}", abr);

        let mut ab = [0.0; 8];
        _mm256_storeu_ps(ab.as_mut_ptr(), abr);
        println!("ab: {:?}", ab);

        assert_eq!(ab[0], -2.0f32);
    }
}

(游乐场)