modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/961122-1.c (about)

     1  long long acc;
     2  
     3  addhi (short a)
     4  {
     5    acc += (long long) a << 32;
     6  }
     7  
     8  subhi (short a)
     9  {
    10    acc -= (long long) a << 32;
    11  }
    12  
    13  main ()
    14  {
    15    acc = 0xffff00000000ll;
    16    addhi (1);
    17    if (acc != 0x1000000000000ll)
    18      abort ();
    19    subhi (1);
    20    if (acc != 0xffff00000000ll)
    21      abort ();
    22    exit (0);
    23  }