modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/20020320-1.c (about)

     1  /* PR c/5354 */
     2  /* Verify that GCC preserves relevant stack slots.  */
     3  
     4  extern void abort(void);
     5  extern void exit(int);
     6  
     7  struct large { int x, y[9]; };
     8  
     9  int main()
    10  {
    11    int fixed;
    12  
    13    fixed = ({ int temp1 = 2; temp1; }) - ({ int temp2 = 1; temp2; });
    14    if (fixed != 1)
    15      abort();
    16  
    17    fixed = ({ struct large temp3; temp3.x = 2; temp3; }).x
    18  	  - ({ struct large temp4; temp4.x = 1; temp4; }).x;
    19    if (fixed != 1)
    20      abort();
    21  
    22    exit(0);
    23  }