gcc/testsuite/gcc.dg/sibcall-7.c

   1 /* Simple check that tail recursive call optimization is also
   2    controlled by -foptimize-sibling-calls.
   3
   4    Copyright (C) 2006 Free Software Foundation Inc.
   5    Original test by Hans-Peter Nilsson  <hp@bitrange.com>  */
   6
   7 /* On IA64 the call frame is allocated on the register stack, not the
   8    normal stack.  */
   9
  10 /* { dg-do run { target { ! "ia64-*-*" } } } */
  11 /* { dg-options "-O2 -fno-optimize-sibling-calls" } */
  12
  13
  14 extern void abort (void);
  15
  16 extern void recurser_void (int);
  17 extern void track (int);
  18
  19 int main (void)
  20 {
  21   recurser_void (0);
  22   return 0;
  23 }
  24
  25 void recurser_void (int n)
  26 {
  27   if (n == 0 || n == 7)
  28     track (n);
  29
  30   if (n == 10)
  31     return;
  32
  33   recurser_void (n + 1);
  34 }
  35
  36 void *trackpoint;
  37
  38 void track (int n)
  39 {
  40   char stackpos[1];
  41
  42   if (n == 0)
  43     trackpoint = stackpos;
  44   else if (n != 7 || trackpoint == stackpos)
  45     abort ();
  46 }