/prog/ challenge #4

Prove the following PRNG is cryptographically insecure:
#define randomize(y) ({uint64_t x=(uint64_t)y;\
x+=~x>>11;x-=~x<<9;x+=~x<<7;\
x+=~x>>10;x-=~x<<8;x+=~x<<6;y=(typeof (y))x;})