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s(a,b)int*a,*b;{int*i=a,*j=--b,p=*(++b),t,u=(t=t++-t+t++-t,t<<(t<<(t/t)));
if(((a-b)&(--u,t<<=--u,u=t))){do{while(!((p-*(i++))&u)&&!((b-i)&u));while
(!((*(j--)-p)&u)&&!((j-a)&u));}while((--i-++j)&u&&(t=*i,*i=*j,*j=t,t?t
:++t));(p-*i)&u&&(t=*i,*i=*b,*b=t);s(a,--i),s((i++,++i),b);}}

Yes, this is valid C, AFAIK. Figure out what it does. (It only works if int is 32 bits wide)