modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/20040916-1.c (about)

     1  /* PR tree-optimization/17512
     2  
     3     We used to try to fold "(char) (X ^ Y)", where '^' is
     4     TRUTH_XOR_EXPR into ((char) X ^ (char) Y), creating TRUTH_XOR_EXPR
     5     with its operands being of type char, which is invalid.  */
     6  
     7  char
     8  foo (int p)
     9  {
    10    int q = p;
    11    return (p != 0) == (p == q);
    12  }