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
   9 foo (int *p, int q)
  10 {
  11   if (p == 0)
  12     {
  13       if (q == 0)
  14         {
  15           int *r = &p[q];
  16           if (r != 0)
  17             link_error ();
  18         }
  19     }
  20 }
  21
  22 /* { dg-final { scan-tree-dump-times "Folding predicate r_.* != 0B to 0" 1 "vrp1" } } */
  23 /* { dg-final { cleanup-tree-dump "vrp1" } } */