re PR rtl-optimization/16180 (gcc crashes when optimization is turned on)

	PR c/16180
	* jump.c (duplicate_loop_exit_test): If the location reached by
	the unconditional jump at the top of the loop is outside the loop,
	then do not treat it as the exit test.

	PR c/16180
	* gcc.dg/loop-5.c: New test.

From-SVN: r86459

gcc/testsuite/ChangeLog

+2004-08-23  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c/16180
+	* gcc.dg/loop-5.c: New test.
+
 2004-08-23  Zdenek Dvorak  <rakdver@atrey.karlin.mff.cuni.cz>
 
 	* gcc.c-torture/execute/20040823-1.c: New test.

gcc/testsuite/gcc.dg/loop-5.c

+/* PR c/16180 */
+/* { dg-options "-O2" } */
+
+extern int b;
+int foo (int a)
+{
+  if (a)
+    {
+      b = 0;
+      for(;;)
+	goto L;
+    }
+ L:
+  for(;;)
+    return 0;
+}