src/stdarch/crates/core_arch/src/aarch64/crc.rs

   1 extern "C" {
   2     #[link_name = "llvm.aarch64.crc32x"]
   3     fn crc32x_(crc: u32, data: u64) -> u32;
   4
   5     #[link_name = "llvm.aarch64.crc32cx"]
   6     fn crc32cx_(crc: u32, data: u64) -> u32;
   7 }
   8
   9 #[cfg(test)]
  10 use stdarch_test::assert_instr;
  11
  12 /// CRC32 single round checksum for quad words (64 bits).
  13 #[inline]
  14 #[target_feature(enable = "crc")]
  15 #[cfg_attr(test, assert_instr(crc32x))]
  16 pub unsafe fn __crc32d(crc: u32, data: u64) -> u32 {
  17     crc32x_(crc, data)
  18 }
  19
  20 /// CRC32-C single round checksum for quad words (64 bits).
  21 #[inline]
  22 #[target_feature(enable = "crc")]
  23 #[cfg_attr(test, assert_instr(crc32cx))]
  24 pub unsafe fn __crc32cd(crc: u32, data: u64) -> u32 {
  25     crc32cx_(crc, data)
  26 }
  27
  28 #[cfg(test)]
  29 mod tests {
  30     use crate::core_arch::{aarch64::*, simd::*};
  31     use std::mem;
  32     use stdarch_test::simd_test;
  33
  34     #[simd_test(enable = "crc")]
  35     unsafe fn test_crc32d() {
  36         assert_eq!(__crc32d(0, 0), 0);
  37         assert_eq!(__crc32d(0, 18446744073709551615), 1147535477);
  38     }
  39
  40     #[simd_test(enable = "crc")]
  41     unsafe fn test_crc32cd() {
  42         assert_eq!(__crc32cd(0, 0), 0);
  43         assert_eq!(__crc32cd(0, 18446744073709551615), 3293575501);
  44     }
  45 }