gcc/testsuite/gcc.dg/tree-ssa/pr22117.c

   1 /* PR tree-optimization/22117
   2    VRP used think that &p[q] is nonzero even though p and q are both
   3    known to be zero after entering the first two "if" statements.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-O2 -fdump-tree-vrp1" } */
   7
   8 void link_error (void);
   9
  10 void
  11 foo (int *p, int q)
  12 {
  13   if (p == 0)
  14     {
  15       if (q == 0)
  16         {
  17           int *r = &p[q];
  18           if (r != 0)
  19             link_error ();
  20         }
  21     }
  22 }
  23
  24 /* { dg-final { scan-tree-dump-times "link_error" 0 "vrp1" } } */