re PR middle-end/21964 (broken tail call at -O2 or more)

	PR middle-end/21964
	* gcc.c-torture/execute/pr21964-1.c: New test.

From-SVN: r102850

gcc/testsuite/ChangeLog

 2005-08-08  Richard Sandiford  <richard@codesourcery.com>
 
+	PR middle-end/21964
+	* gcc.c-torture/execute/pr21964-1.c: New test.
+
+2005-08-08  Richard Sandiford  <richard@codesourcery.com>
+
 	PR c/22458
 	* gcc.dg/pr22458-1.c: New test.
 

gcc/testsuite/gcc.c-torture/execute/pr21964-1.c

+void
+foo (int n, int m)
+{
+  if (m == 0)
+    exit (0);
+  else if (n != 0)
+    abort ();
+  else
+    foo (n++, m - 1);
+}
+ 
+int
+main (void)
+{
+  foo (0, 4);
+}