core/stdarch/crates/core_arch/src/x86_64/
sse42.rs

1//! `x86_64`'s Streaming SIMD Extensions 4.2 (SSE4.2)
2
3#[cfg(test)]
4use stdarch_test::assert_instr;
5
6#[allow(improper_ctypes)]
7unsafe extern "C" {
8    #[link_name = "llvm.x86.sse42.crc32.64.64"]
9    fn crc32_64_64(crc: u64, v: u64) -> u64;
10}
11
12/// Starting with the initial value in `crc`, return the accumulated
13/// CRC32-C value for unsigned 64-bit integer `v`.
14///
15/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_crc32_u64)
16#[inline]
17#[target_feature(enable = "sse4.2")]
18#[cfg_attr(test, assert_instr(crc32))]
19#[stable(feature = "simd_x86", since = "1.27.0")]
20pub fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
21    unsafe { crc32_64_64(crc, v) }
22}
23
24#[cfg(test)]
25mod tests {
26    use crate::core_arch::arch::x86_64::*;
27
28    use stdarch_test::simd_test;
29
30    #[simd_test(enable = "sse4.2")]
31    unsafe fn test_mm_crc32_u64() {
32        let crc = 0x7819dccd3e824;
33        let v = 0x2a22b845fed;
34        let i = _mm_crc32_u64(crc, v);
35        assert_eq!(i, 0xbb6cdc6c);
36    }
37}