modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/920710-2.c (about)

     1  union u
     2  {
     3    struct {unsigned h, l;} i;
     4    double d;
     5  };
     6  
     7  foo (union u x)
     8  {
     9    while (x.i.h++)
    10      {
    11        while (x.i.l-- > 0)
    12  	;
    13        while (x.d++ > 0)
    14  	;
    15      }
    16  }
    17  
    18  union n
    19  {
    20    long long unsigned i;
    21    double d;
    22  };
    23  
    24  bar (union n x)
    25  {
    26    int i;
    27    for (i = 0; i < 100; i++)
    28      {
    29        while (--x.i > 0)
    30  	;
    31        while (++x.d > 0)
    32  	;
    33      }
    34    return x.i;
    35  }
    36