gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-17.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-ccp1" } */
   3
   4 int foo(void)
   5 {
   6   int i = 0;
   7   char *p = (char *)&i;
   8   return *(int *)p;
   9 }
  10
  11 struct Foo {
  12   int i;
  13 } f;
  14
  15 int bar(void)
  16 {
  17   char *p = (char *)&f;
  18   return ((struct Foo *)p)->i;
  19 }
  20
  21 extern const struct Foo g;
  22
  23 int foobar(void)
  24 {
  25   struct Foo *p = (struct Foo *)&g;
  26   return ((const struct Foo *)p)->i;
  27 }
  28
  29 /* { dg-final { scan-tree-dump "= i_.;" "ccp1" } } */
  30 /* { dg-final { scan-tree-dump "= f.i;" "ccp1" } } */
  31 /* { dg-final { scan-tree-dump "= g.i;" "ccp1" } } */