Function __crc32b 

pub fn __crc32b(crc: u32, data: u8) -> u32

Available on (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) and (ARM or AArch64 or ARM64EC) and target feature crc only.

CRC32 single round checksum for bytes (8 bits). Arm’s documentation