Unpacks and interleave 64-bit integers from the high half of each
128-bit lane of a and b.
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;
# fn main() {
# if is_x86_feature_detected!("avx2") {
# #[target_feature(enable = "avx2")]
# unsafe fn worker() {
let a = _mm256_setr_epi64x(0, 1, 2, 3);
let b = _mm256_setr_epi64x(0, -1, -2, -3);
let c = _mm256_unpackhi_epi64(a, b);
let expected = _mm256_setr_epi64x(1, -1, 3, -3);
assert_eq!(_mm256_movemask_epi8(_mm256_cmpeq_epi8(c, expected)), !0);
# }
# unsafe { worker(); }
# }
# }
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