gcc/testsuite/gcc.dg/tree-ssa/pr21985.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-vars" } */
   3
   4 struct
   5 {
   6   struct
   7     {
   8       int a;
   9       int b;
  10     } a[100];
  11 } a;
  12
  13 void foo(unsigned);
  14 unsigned *bar (void);
  15
  16 int
  17 main (void)
  18 {
  19   unsigned *b = bar ();
  20
  21   /* This should be folded.  */
  22   foo (&a.a[50].a - &a.a[33].b);
  23   foo ((unsigned) &a.a[50].b - (unsigned) &a);
  24
  25   /* And this should not.  */
  26   foo ((unsigned) &b - (unsigned) b);
  27   return 0;
  28 }
  29
  30 /* Two of the calls to foo should be folded to just foo(constant).  */
  31
  32 /* { dg-final { scan-tree-dump-times "foo \\(\[0-9\]*\\)" 2 "vars" } } */