src/stdarch/crates/core_arch/src/x86/bswap.rs

   1 //! Byte swap intrinsics.
   2 #![allow(clippy::module_name_repetitions)]
   3
   4 #[cfg(test)]
   5 use stdarch_test::assert_instr;
   6
   7 /// Returns an integer with the reversed byte order of x
   8 ///
   9 /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bswap)
  10 #[inline]
  11 #[cfg_attr(test, assert_instr(bswap))]
  12 #[stable(feature = "simd_x86", since = "1.27.0")]
  13 pub unsafe fn _bswap(x: i32) -> i32 {
  14     x.swap_bytes()
  15 }
  16
  17 #[cfg(test)]
  18 mod tests {
  19     use super::*;
  20
  21     #[test]
  22     fn test_bswap() {
  23         unsafe {
  24             assert_eq!(_bswap(0x0EADBE0F), 0x0FBEAD0E);
  25             assert_eq!(_bswap(0x00000000), 0x00000000);
  26         }
  27     }
  28 }