uint32_t aws_checksums_crc32c_hw()

in source/arm/crc32c_arm.c [17:55]

• 33 lines of code
• 6 McCabe index (conditional complexity)

uint32_t aws_checksums_crc32c_hw(const uint8_t *data, int length, uint32_t previousCrc32) {
    uint32_t crc = ~previousCrc32;

    // Align data if it's not aligned
    while (((uintptr_t)data & 7) && length > 0) {
        crc = __crc32cb(crc, *(uint8_t *)data);
        data++;
        length--;
    }

    while (length >= 64) {
        PREFETCH(data + 384);
        uint64_t *d = (uint64_t *)data;
        crc = __crc32cd(crc, d[0]);
        crc = __crc32cd(crc, d[1]);
        crc = __crc32cd(crc, d[2]);
        crc = __crc32cd(crc, d[3]);
        crc = __crc32cd(crc, d[4]);
        crc = __crc32cd(crc, d[5]);
        crc = __crc32cd(crc, d[6]);
        crc = __crc32cd(crc, d[7]);
        data += 64;
        length -= 64;
    }

    while (length >= 8) {
        crc = __crc32cd(crc, *(uint64_t *)data);
        data += 8;
        length -= 8;
    }

    while (length > 0) {
        crc = __crc32cb(crc, *(uint8_t *)data);
        data++;
        length--;
    }

    return ~crc;
}