gcc/testsuite/gcc.dg/tree-ssa/vrp07.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-vrp1-details" } */
   3
   4 foo (int i, int *p)
   5 {
   6   int j;
   7
   8   if (i > 10)
   9     {
  10       if (p)
  11         {
  12           j = *p;
  13           /* This should be folded to if (1) because of the parent 'if
  14              (p)'.  But the dereference of p above does not need an
  15              assertion.  */
  16           if (p)
  17             return j + 1;
  18         }
  19     }
  20   else
  21     {
  22       j = *p - 3;
  23       /* This should be folded to if (0), because p has just been
  24          dereferenced.  But we were not inserting enough ASSERT_EXPRs
  25          to figure it out.  */
  26       if (!p)
  27         return j - 4;
  28     }
  29
  30   return i;
  31 }
  32
  33 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 1 "vrp1" } } */
  34 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 0" 1 "vrp1" } } */
  35 /* { dg-final { scan-tree-dump-times "PREDICATE: p_\[0-9\] ne_expr 0B" 2 "vrp1" } } */
  36 /* { dg-final { cleanup-tree-dump "vrp1" } } */