diff options
Diffstat (limited to 'library/stdarch/crates/core_arch/src/x86_64/bswap.rs')
-rw-r--r-- | library/stdarch/crates/core_arch/src/x86_64/bswap.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/library/stdarch/crates/core_arch/src/x86_64/bswap.rs b/library/stdarch/crates/core_arch/src/x86_64/bswap.rs new file mode 100644 index 000000000..90a209ce3 --- /dev/null +++ b/library/stdarch/crates/core_arch/src/x86_64/bswap.rs @@ -0,0 +1,29 @@ +//! Byte swap intrinsics. + +#![allow(clippy::module_name_repetitions)] + +#[cfg(test)] +use stdarch_test::assert_instr; + +/// Returns an integer with the reversed byte order of x +/// +/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bswap64) +#[inline] +#[cfg_attr(test, assert_instr(bswap))] +#[stable(feature = "simd_x86", since = "1.27.0")] +pub unsafe fn _bswap64(x: i64) -> i64 { + x.swap_bytes() +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_bswap64() { + unsafe { + assert_eq!(_bswap64(0x0EADBEEFFADECA0E), 0x0ECADEFAEFBEAD0E); + assert_eq!(_bswap64(0x0000000000000000), 0x0000000000000000); + } + } +} |