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/* Simple check that sibling calls are performed from a

   void non-leaf-function taking no arguments calling a function which

   is about the same as itself.

   Copyright (C) 2002 Free Software Foundation Inc.

   Contributed by Hans-Peter Nilsson  <hp@bitrange.com>  */

/* { dg-do run { xfail { { arc-*-* avr-*-* cris-*-* crisv32-*-* h8300-*-* hppa*64*-*-* m32r-*-* m68hc1?-*-* mcore-*-* mn10300-*-* xstormy16-*-* v850*-*-* vax-*-* xtensa*-*-* } || { arm*-*-* && { ! arm32 } } } } } */

/* -mlongcall disables sibcall patterns.  */

/* { dg-skip-if "" { powerpc*-*-* } { "-mlongcall" } { "" } } */

/* { dg-options "-O2 -foptimize-sibling-calls" } */

/* The option -foptimize-sibling-calls is the default, but serves as

   marker.  This test is xfailed on targets without sibcall patterns

   (except targets where the test does not work due to the return address

   not saved on the regular stack).  */

extern void abort (void);

extern void exit (int);

/* Sibcalls are not supported in MIPS16 mode, which has direct calls but

   not direct jumps.  */

#ifdef __mips

#define ATTR __attribute__((nomips16))

#else

#define ATTR

#endif

static ATTR void recurser_void1 (void);

static ATTR void recurser_void2 (void);

extern void track (void);

int n = 0;

int main ()

{

  recurser_void1 ();

  exit (0);

}

/* The functions should get the same stack-frame, and best way to make it

   reasonably sure is to make them have the same contents (regarding the

   n tests).  */

static void __attribute__((noinline)) ATTR

recurser_void1 (void)

{

  if (n == 0 || n == 7 || n == 8)

    track ();

  if (n == 10)

    return;

  n++;

  recurser_void2 ();

}

static void __attribute__((noinline)) ATTR

recurser_void2 (void)

{

  if (n == 0 || n == 7 || n == 8)

    track ();

  if (n == 10)

    return;

  n++;

  recurser_void1 ();

}

void *trackpoint;

void __attribute__ ((noinline))

track ()

{

  char stackpos[1];

  if (n == 0)

    trackpoint = stackpos;

  else if ((n != 7 && n != 8) || trackpoint != stackpos)

    abort ();

}