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Microsoft Specific

Emits the Streaming SIMD Extensions 4 (SSE4) instruction crc32. This instruction adds one parameter to the CRC-32C checksum of the other parameter.

unsigned int64 _mm_crc32_u64 (
   unsigned int crc,
   unsigned __int64 v



[in] crc

An unsigned integer to add.

[in] v

A 64-bit integer. The checksum will be computed from this input parameter.

r := crc + CRC-32C(v)





Header file <nmmintrin.h>

CRC32-C algorithm is based on polynomial 0x1EDC6F41. It is implemented by following little-endian convention. This means that the most significant bit is treated as the least significant bit in the quotient.

Before you use this intrinsic, software must ensure that the processor supports this instruction.

#include <stdio.h>
#include <nmmintrin.h>

int main ()
    unsigned __int64 crc = 0x000011115555AAAA;
    unsigned __int64 input = 0x88889999EEEE3333;

    unsigned __int64 res = _mm_crc32_u64(crc, input);
    printf_s("Result res: 0x%08X%08X\n", (unsigned int) (res>>32), res);

    return 0;
Result res: 0x0000000016F57621