/* Simple check that sibling calls are performed from a
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/* Simple check that sibling calls are performed from a
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void non-leaf-function taking no arguments calling a function which
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void non-leaf-function taking no arguments calling a function which
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is about the same as itself.
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is about the same as itself.
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Copyright (C) 2002 Free Software Foundation Inc.
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Copyright (C) 2002 Free Software Foundation Inc.
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Contributed by Hans-Peter Nilsson <hp@bitrange.com> */
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Contributed by Hans-Peter Nilsson <hp@bitrange.com> */
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/* { dg-do run { xfail arc-*-* avr-*-* c4x-*-* cris-*-* h8300-*-* hppa*64*-*-* m32r-*-* m68hc1?-*-* m681?-*-* m680*-*-* m68k-*-* mcore-*-* mn10300-*-* xstormy16-*-* v850*-*-* vax-*-* xtensa-*-* } } */
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/* { dg-do run { xfail arc-*-* avr-*-* c4x-*-* cris-*-* h8300-*-* hppa*64*-*-* m32r-*-* m68hc1?-*-* m681?-*-* m680*-*-* m68k-*-* mcore-*-* mn10300-*-* xstormy16-*-* v850*-*-* vax-*-* xtensa-*-* } } */
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/* { dg-options "-O2 -foptimize-sibling-calls" } */
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/* { dg-options "-O2 -foptimize-sibling-calls" } */
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/* The option -foptimize-sibling-calls is the default, but serves as
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/* The option -foptimize-sibling-calls is the default, but serves as
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marker. This test is xfailed on targets without sibcall patterns
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marker. This test is xfailed on targets without sibcall patterns
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(except targets where the test does not work due to the return address
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(except targets where the test does not work due to the return address
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not saved on the regular stack). */
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not saved on the regular stack). */
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extern void abort (void);
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extern void abort (void);
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extern void exit (int);
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extern void exit (int);
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static void recurser_void1 (void);
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static void recurser_void1 (void);
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static void recurser_void2 (void);
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static void recurser_void2 (void);
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extern void track (void);
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extern void track (void);
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int n = 0;
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int n = 0;
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int main ()
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int main ()
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{
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{
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recurser_void1 ();
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recurser_void1 ();
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exit (0);
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exit (0);
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}
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}
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/* The functions should get the same stack-frame, and best way to make it
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/* The functions should get the same stack-frame, and best way to make it
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reasonably sure is to make them have the same contents (regarding the
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reasonably sure is to make them have the same contents (regarding the
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n tests). */
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n tests). */
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|
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static void __attribute__((noinline))
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static void __attribute__((noinline))
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recurser_void1 (void)
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recurser_void1 (void)
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{
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{
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if (n == 0 || n == 7 || n == 8)
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if (n == 0 || n == 7 || n == 8)
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track ();
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track ();
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|
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if (n == 10)
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if (n == 10)
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return;
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return;
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n++;
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n++;
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recurser_void2 ();
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recurser_void2 ();
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}
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}
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|
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static void __attribute__((noinline))
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static void __attribute__((noinline))
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recurser_void2 (void)
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recurser_void2 (void)
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{
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{
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if (n == 0 || n == 7 || n == 8)
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if (n == 0 || n == 7 || n == 8)
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track ();
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track ();
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|
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if (n == 10)
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if (n == 10)
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return;
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return;
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n++;
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n++;
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recurser_void1 ();
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recurser_void1 ();
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}
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}
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|
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void *trackpoint;
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void *trackpoint;
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|
|
void
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void
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track ()
|
track ()
|
{
|
{
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char stackpos[1];
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char stackpos[1];
|
|
|
if (n == 0)
|
if (n == 0)
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trackpoint = stackpos;
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trackpoint = stackpos;
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else if ((n != 7 && n != 8) || trackpoint != stackpos)
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else if ((n != 7 && n != 8) || trackpoint != stackpos)
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abort ();
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abort ();
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}
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}
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