gcc/testsuite/gcc.dg/tree-ssa/pr47392.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fno-code-hoisting -fdump-tree-pre-stats" } */
   3
   4 struct A
   5 {
   6   int i;
   7 };
   8
   9 struct B
  10 {
  11   struct A a[2];
  12 };
  13
  14 int i = 1;
  15 struct B b = { 0, 3 };
  16
  17 void
  18 test ()
  19 {
  20   if (b.a[0].i != i)
  21     {
  22       int t = b.a[0].i;
  23       b.a[0] = b.a[1];
  24       b.a[1].i = t;
  25     }
  26
  27   if (b.a[1].i == i)
  28     __builtin_abort ();
  29
  30   if (b.a[0].i == 0)
  31     __builtin_abort ();
  32 }
  33
  34 int
  35 main ()
  36 {
  37   test ();
  38   return 0;
  39 }
  40
  41 /* { dg-final { scan-tree-dump "Eliminated: 1" "pre" } } */