re PR rtl-optimization/13521 ([3.3 only] Endless loop in calculate_global_regs_live)

	PR optimization/13521
	* gcc.c-torture/compile/20031231-1.c: New test.

From-SVN: r75301

gcc/testsuite/ChangeLog

+2004-01-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR optimization/13521
+	* gcc.c-torture/compile/20031231-1.c: New test.
+
 2003-12-30  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* gcc.dg/sibcall-4.c: Replace mn10?00 with mn10300.

gcc/testsuite/gcc.c-torture/compile/20031231-1.c

+extern int f1 (int, void *);
+extern int *f2 (void) __attribute__ ((__const__));
+extern int f3 (int, void *);
+
+int
+test (int x, char *y, int z)
+{
+  int b = 0;
+
+  if (x < 1024)
+    {
+      y[0] = '\0';
+
+      do
+	{
+	  switch (f1 (x, y + b))
+	    {
+	    case -1:
+	      if (b == 0)
+		return -1;
+	      else
+		return b;
+
+	    default:
+	      b++;
+	    }
+	}
+      while (y[b - 1] != '\0' && y[b - 1] != '\n' && b < z);
+    }
+  else
+    {
+      do
+	{
+	  switch (f3 (x, y + b))
+	    {
+	    case -1:
+	      if ((*f2 ()) == 4)
+		continue;
+	      if (b == 0)
+		return -1;
+	      else
+		return b;
+
+	    default:
+	      b++;
+	    }
+	}
+      while (y[b - 1] != '\0' && y[b - 1] != '\n' && b < z);
+    }
+  return b;
+}