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

     1  
     2  extern void abort(void);
     3  
     4  __attribute__ ((noinline))
     5  int foo(int n)
     6  {
     7    if (n < 0)
     8      n = ~n;
     9  
    10    return n;
    11  }
    12  
    13  int main(void)
    14  {
    15    if (foo (-1) != 0)
    16      abort ();
    17  
    18    return 0;
    19  }