gcc/testsuite/gcc.dg/pr30137-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-w -fdump-tree-gimple" } */
   3
   4 /* Things that should be folded.  */
   5
   6 struct { long base; int tail; void * volatile ptr; } *s;
   7 int foo1a (void) { return (s == &s->base); }
   8 int foo1b (void) { return (&s->base == s); }
   9 int foo2 (void) { return ((void *)s == (void *) &s->base); }
  10 int foo4 (void) { return s->base == s->base; }
  11 int foo5 (void) { return &s->ptr == &s->ptr; }
  12 int foo6 (void) { return &s->ptr != &s->ptr; }
  13 int foo7 (void) { return &s->base != &s->ptr; }
  14
  15 struct { union { int i; short s } u; } x;
  16 int foo8 (void) { return &x.u.i == &x.u.s; }
  17
  18 /* { dg-final { scan-tree-dump-times "= 0" 1 "gimple" } } */
  19 /* { dg-final { scan-tree-dump-times "= 1" 7 "gimple" } } */