Function updateCrc

common/transferprotocol.cpp:43–58

Hardware CRC32 on ARMv8. devkitA64 builds with -march=armv8-a+crc, so the checksum is effectively free instead of a bytewise table loop.

    // Hardware CRC32 on ARMv8. devkitA64 builds with -march=armv8-a+crc, so the
    // checksum is effectively free instead of a bytewise table loop.
    uint32_t updateCrc(uint32_t crc, const uint8_t* data, size_t len)
    {
        uint32_t c = crc;
        while (len >= 8) {
            uint64_t v;
            std::memcpy(&v, data, 8);
            c = __crc32d(c, v);
            data += 8;
            len -= 8;
        }
        while (len > 0) {
            c = __crc32b(c, *data++);
            len--;
        }
        return c;
    }
#else
    namespace {
        uint32_t crcTable[8][256];