     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
    36
    37

    //! `x86_64`'s Streaming SIMD Extensions 4.2 (SSE4.2)

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.sse42.crc32.64.64"]
        fn crc32_64_64(crc: u64, v: u64) -> u64;
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 64-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u64)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u64(crc: u64, v: u64) -> u64 {
        crc32_64_64(crc, v)
    }

    #[cfg(test)]
    mod tests {
        use coresimd::arch::x86_64::*;

        use stdsimd_test::simd_test;

        #[simd_test = "sse4.2"]
        unsafe fn test_mm_crc32_u64() {
            let crc = 0x7819dccd3e824;
            let v = 0x2a22b845fed;
            let i = _mm_crc32_u64(crc, v);
            assert_eq!(i, 0xbb6cdc6c);
        }
    }

# 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`)