re PR bootstrap/56689 (internal compiler error: in get_loop_body, at cfgloop.c:841)

2013-03-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56689
	* tree-vrp.c (execute_vrp): Mark loops for fixup if we removed
	any edge.

	* gcc.dg/torture/pr56689.c: New testcase.

From-SVN: r197039

gcc/ChangeLog

 2013-03-25  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/56689
+	* tree-vrp.c (execute_vrp): Mark loops for fixup if we removed
+	any edge.
+
+2013-03-25  Richard Biener  <rguenther@suse.de>
+
 	* tree-ssa-loop-im.c (struct mem_ref): Use bitmap_head instead
 	of bitmap.
 	(memory_references): Likewise.

gcc/testsuite/ChangeLog

+2013-03-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/56689
+	* gcc.dg/torture/pr56689.c: New testcase.
+
 2013-03-25  Kai Tietz  <ktietz@redhat.com>
 
 	* g++.dg/torture/20121105-1.C: Adjust for LLP64 targets.

gcc/testsuite/gcc.dg/torture/pr56689.c

+/* { dg-do compile } */
+
+extern int baz ();
+extern void bar (void);
+extern void noret (void)   __attribute__ ((__noreturn__));
+
+void
+fix_register (const char *name, int fixed, int call_used, int nregs)
+{
+  int i;
+  int reg;
+
+  if ((reg = baz ()) >= 0)
+    {
+      for (i = reg; i < nregs; i++)
+	{
+	  if ((i == 15 || i == 11) && (fixed == 0 || call_used == 0))
+	    {
+	      switch (fixed)
+		{
+		case 0:
+		  switch (call_used)
+		    {
+		    case 1:
+		      bar ();
+		      break;
+		    default:
+		      (noret ());
+		    }
+		case 1:
+		  switch (call_used)
+		    {
+		    case 1:
+		      break;
+		    case 0:
+		    default:
+		      (noret ());
+		    }
+		  break;
+		default:
+		  (noret ());
+		}
+	    }
+	}
+    }
+}

gcc/tree-vrp.c

@@ -9329,7 +9329,11 @@ execute_vrp (void)
     }
 
   if (to_remove_edges.length () > 0)
-    free_dominance_info (CDI_DOMINATORS);
+    {
+      free_dominance_info (CDI_DOMINATORS);
+      if (current_loops)
+	loops_state_set (LOOPS_NEED_FIXUP);
+    }
 
   to_remove_edges.release ();
   to_update_switch_stmts.release ();