modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/bad.c (about)

     1  typedef union longlong
     2  {
     3    struct {unsigned short h0, h1, h2, h3;} h;
     4    struct {signed long low, high;} si;
     5    struct {unsigned long low, high;} ui;
     6    signed long long sll;
     7    unsigned long long ull;
     8  } long_long;
     9  
    10  
    11  long long
    12  __negdi2 (u)
    13       long long u;
    14  {
    15    long_long uu;
    16  
    17    uu.sll = u;
    18  
    19    uu.si.low = -uu.si.low;
    20    if (uu.si.low == 0)
    21      uu.si.high = -uu.si.high;
    22    else
    23      uu.si.high = ~uu.si.high;
    24  
    25    return uu.sll;
    26  }