[banthar]

This is how all undefined behavior works. It seems to be working now but breaks with new CPU, GCC version or on wrong moon phase.

"-Wcast-align=strict" will work in this but not all cases - that's why we have UBSAN:

    $ gcc -fsanitize=undefined test.c
    $ ./a.out 
    test.c:6:6: runtime error: store to misaligned address 0x55e4007adeb1 for type 'int', which requires 4 byte alignment
    0x55e4007adeb1: note: pointer points here
     00 00 00  01 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  51 00 00 00 00