modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/920731-1.c (about)

     1  f(x){int i;for(i=0;i<8&&(x&1)==0;x>>=1,i++);return i;}
     2  main(){if(f(4)!=2)abort();exit(0);}