1  /* { dg-do compile } */
       2  /* { dg-options "-fwrapv -O1 -fno-tree-fre -fdisable-tree-evrp -ftree-vrp -fdump-tree-vrp1 -fdisable-tree-ethread -fdisable-tree-thread1" } */
       3  
       4  extern void abort ();
       5  extern void exit (int);
       6  
       7  int f (int a) {
       8  	if (a != 0) {
       9  		a = a > 0 ? a : -a;
      10  		if (a == 0)
      11  		  return 1;
      12  		return 0;
      13  	}
      14  	return 0;
      15  }
      16  
      17  int g (int b) {
      18  	if (b != 0) {
      19  		b = b > 0 ? b : -b;
      20  		if (b != 0)
      21  		  return 0;
      22  	}
      23  	return 1;
      24  }
      25  
      26  /* { dg-final { scan-tree-dump "Folding predicate a_\.\* == 0 to 0" "vrp1" } } */
      27  /* { dg-final { scan-tree-dump "Folding predicate b_\.\* != 0 to 1" "vrp1" } } */