Viewing file:  sibcall-1.c (1.46 KB) -rw-r--r--
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/* Simple check that sibling calls are performed from a
void non-leaf-function taking one int argument calling itself.
Copyright (C) 2002 Free Software Foundation Inc.
Contributed by Hans-Peter Nilsson <hp@bitrange.com> */
/* { dg-do run } */
/* { dg-options "-O2 -foptimize-sibling-calls" } */
/* See note in recurser_void() as to why we disable threading. */
/* { dg-additional-options "-fdisable-tree-thread1" } */
/* The option -foptimize-sibling-calls is the default, but serves as
marker. Self-recursion tail calls are optimized for all targets,
regardless of presence of sibcall patterns. */
extern void abort (void);
extern void exit (int);
extern void recurser_void (int);
extern void track (int);
int main ()
{
recurser_void (0);
exit (0);
}
void
recurser_void (int n)
{
/* In some architectures like ppc64*, jump threading may thread
paths such that there are two calls into track(), one for
track(0) and one for track(7). The track(7) call can be
transformed into a jump instead of a call, which means that
different calls into track() may end up with a different
&stackpos. This is the reason we disable jump threading for this
test. */
if (n == 0 || n == 7)
track (n);
if (n == 10)
return;
recurser_void (n + 1);
}
void *trackpoint;
void __attribute__ ((noipa))
track (int n)
{
char stackpos[1];
if (n == 0)
trackpoint = stackpos;
else if (n != 7 || trackpoint != stackpos)
abort ();
}
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