modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/991229-2.c (about)

     1  void foo ();
     2  
     3  void update (double* r)
     4  {
     5    foo ();
     6      {
     7        register double  y1;
     8        y1 = r[ 4] - r[11];
     9      }
    10  }