     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35

    //! 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 {
        bswap_i64(x)
    }

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.bswap.i64"]
        fn bswap_i64(x: i64) -> i64;
    }

    #[cfg(test)]
    mod tests {
        use super::*;

        #[test]
        fn test_bswap64() {
            unsafe {
                assert_eq!(_bswap64(0x0EADBEEFFADECA0E), 0x0ECADEFAEFBEAD0E);
                assert_eq!(_bswap64(0x0000000000000000), 0x0000000000000000);
            }
        }
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)