gcc/testsuite/gcc.dg/tree-ssa/pr47286.c

   1 /* { dg-do compile } */
   2 /* { dg-skip-if "" { ! { i?86-*-* x86_64-*-* } } } */
   3 /* { dg-options "-O2 -fdump-tree-optimized" } */
   4
   5 struct thread_info { int preempt_count; };
   6 static inline struct thread_info *current_thread_info(void)
   7 {
   8   register struct thread_info *sp asm("esp");
   9   return sp;
  10 }
  11 void testcase(void)
  12 {
  13   current_thread_info()->preempt_count += 1;
  14 }
  15
  16 /* We have to make sure that alias analysis treats sp as pointing
  17    to globals and thus the store not optimized away.  */
  18
  19 /* { dg-final { scan-tree-dump "->preempt_count =" "optimized" } } */