gcc/testsuite/gcc.dg/sibcall-6.c

   1 /* A simple check to see whether indirect calls are
   2    being sibcall optimized on targets that do support
   3    this notion, i.e. have the according call patterns
   4    in place.
   5
   6    Copyright (C) 2002 Free Software Foundation Inc.
   7    Contributed by Andreas Bauer <baueran@in.tum.de>  */
   8
   9 /* { dg-do run { target i?86-*-* x86_64-*-*} } */
  10 /* { dg-options "-O2 -foptimize-sibling-calls" } */
  11
  12 int foo (int);
  13 int bar (int);
  14
  15 int (*ptr) (int);
  16 int *f_addr;
  17
  18 int
  19 main ()
  20 {
  21   ptr = bar;
  22   foo (7);
  23   exit (0);
  24 }
  25
  26 int
  27 bar (b)
  28      int b;
  29 {
  30   if (f_addr == (int*) __builtin_return_address (0))
  31     return b;
  32   else
  33     abort ();
  34 }
  35
  36 int
  37 foo (f)
  38      int f;
  39 {
  40   f_addr = (int*) __builtin_return_address (0);
  41   return (*ptr)(f);
  42 }