core\stdarch\crates\core_arch\src\x86_64/
bswap.rs

1//! Byte swap intrinsics.
2
3#![allow(clippy::module_name_repetitions)]
4
5#[cfg(test)]
6use stdarch_test::assert_instr;
7
8/// Returns an integer with the reversed byte order of x
9///
10/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_bswap64)
11#[inline]
12#[cfg_attr(test, assert_instr(bswap))]
13#[stable(feature = "simd_x86", since = "1.27.0")]
14pub unsafe fn _bswap64(x: i64) -> i64 {
15    x.swap_bytes()
16}
17
18#[cfg(test)]
19mod tests {
20    use super::*;
21
22    #[test]
23    fn test_bswap64() {
24        unsafe {
25            assert_eq!(_bswap64(0x0EADBEEFFADECA0E), 0x0ECADEFAEFBEAD0E);
26            assert_eq!(_bswap64(0x0000000000000000), 0x0000000000000000);
27        }
28    }
29}