gcc/testsuite/gcc.dg/tree-ssa/pr33172.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 struct abc {
   5     void (*abc_call)(void);
   6 };
   7
   8 /*
   9  * Use only any one of the three definitions below at a time:
  10  *
  11  * 1. nothing optimized away. Good.
  12  * 2. call_func() _not_ optimized away, but struct xyz is. gcc disappoints.
  13  * 3. both call_func() and struct xyz optimized away. Nice.
  14  */
  15
  16 /* 1 */
  17 /*extern int do_register(struct abc *xyz);*/
  18
  19 /* 2 */
  20 static inline int do_register(struct abc *xyz)
  21 {
  22     return 0;
  23 }
  24
  25 /* 3 */
  26 /*#define do_register(xyz)    do { (void)(xyz); } while (0)*/
  27
  28 static void call_func(void)
  29 {
  30 }
  31
  32 static struct abc xyz = {
  33     .abc_call = call_func,
  34 };
  35
  36 void func(void)
  37 {
  38     do_register(&xyz);
  39 }
  40
  41 /* { dg-final { scan-tree-dump-not "call_func" "optimized"} } */