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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-tree-fre -fdisable-tree-evrp -fdump-tree-vrp1-details -fdelete-null-pointer-checks" } */
   3
   4 int
   5 foo (int i, int *p)
   6 {
   7   int j;
   8
   9   if (i > 10)
  10     {
  11       if (p)
  12         {
  13           j = *p;
  14           /* This should be folded to if (1) because of the parent 'if
  15              (p)'.  But the dereference of p above does not need an
  16              assertion.  */
  17           if (p)
  18             return j + 1;
  19         }
  20     }
  21   else
  22     {
  23       j = *p - 3;
  24       /* This should be folded to if (0), because p has just been
  25          dereferenced.  But we were not inserting enough ASSERT_EXPRs
  26          to figure it out.  */
  27       if (!p)
  28         return j - 4;
  29     }
  30
  31   return i;
  32 }
  33 /* Target disabling -fdelete-null-pointer-checks should not fold checks */
  34 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 1" 1 "vrp1" } } */
  35 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 0" 1 "vrp1" { target { ! keeps_null_pointer_checks } } } } */
  36 /* { dg-final { scan-tree-dump-times "Folding predicate p_.*to 0" 0 "vrp1" { target {   keeps_null_pointer_checks } } } } */
  37
  38 /* { dg-final { scan-tree-dump-times "PREDICATE: p_\[0-9\]" 2 "vrp1" { target { ! keeps_null_pointer_checks } } } } */
  39 /* { dg-final { scan-tree-dump-times "PREDICATE: p_\[0-9\]" 1 "vrp1" { target {   keeps_null_pointer_checks } } } } */