gcc/testsuite/gcc.dg/pr30137-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-w -fdump-tree-gimple" } */
   3
   4 /* Things that should not be folded.  */
   5
   6 struct { long base; int tail; void * volatile ptr; } *s;
   7 int foo3 (void) { return s == &s; }
   8 int foo5 (void) { return s->ptr == s->ptr; }
   9
  10 struct { union { int i; short s } u; } x;
  11 int foo6 (void) { return x.u.i == x.u.s; }
  12
  13 void **p;
  14 int foo8 (void) { return p == &p; }
  15 int foo9 (void) { return *p == p; }
  16 int foo10 (void) { return *p == &p; }
  17 int foo11 (void) { return p != &p; }
  18 int foo12 (void) { return *p != p; }
  19 int foo13 (void) { return *p != &p; }
  20
  21 /* { dg-final { scan-tree-dump-not "= 0;" "gimple" } } */
  22 /* { dg-final { scan-tree-dump-not "= 1;" "gimple" } } */
  23 /* { dg-final { cleanup-tree-dump "gimple" } } */