gcc/testsuite/gcc.dg/tree-ssa/isolate-4.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdelete-null-pointer-checks -fisolate-erroneous-paths-attribute -fdump-tree-isolate-paths -fdump-tree-phicprop1" } */
   3 /* { dg-skip-if "" keeps_null_pointer_checks } */
   4
   5
   6 extern void foo(void *) __attribute__ ((__nonnull__ (1)));
   7
   8 int z;
   9
  10 void
  11 com (int a)
  12 {
  13     foo (a == 42 ? &z  : (void *) 0);
  14 }
  15
  16 void
  17 bar (void)
  18 {
  19   foo ((void *)0);
  20 }
  21
  22 /* We testing that the path isolation code can take advantage of the
  23    returns non-null attribute to isolate a path where NULL flows into
  24    a return statement.
  25
  26    We also verify that after isolation phi-cprop simplifies the
  27    return statement so that it returns &z directly. */
  28 /* { dg-final { scan-tree-dump-times "__builtin_trap" 2 "isolate-paths"} } */
  29 /* { dg-final { scan-tree-dump-times "foo .&z.;" 1 "phicprop1"} } */
  30
  31