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

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