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

   1 /* Regression test for PR middle-end/23584 */
   2 /* Verify that dereferencing a volatile element in a struct causes
   3    the function not be pure.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-O1 -fdump-ipa-pure-const" } */
   7
   8 struct test_a { volatile int a; };
   9
  10 int func_a(struct test_a *a)
  11 {
  12         return a->a;
  13 }
  14
  15 /* { dg-final { scan-ipa-dump-not "found to be pure: func_a" "pure-const" } } */