re PR rtl-optimization/44469 (internal compiler error: in fixup_reorder_chain, at cfglayout.c:797)

	PR rtl-optimization/44469
	* cfgcleanup.c (try_optimize_cfg): Iterate in CFG layout mode too
	after removing trivially dead basic blocks.

From-SVN: r169304

gcc/ChangeLog

+2011-01-26  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR rtl-optimization/44469
+	* cfgcleanup.c (try_optimize_cfg): Iterate in CFG layout mode too
+	after removing trivially dead basic blocks.
+
 2011-01-26  Joseph Myers  <joseph@codesourcery.com>
 
 	* config/bfin/bfin.h (LINK_SPEC): Remove %{Qy:} %{!Qn:-Qy}.

gcc/cfgcleanup.c

@@ -2341,8 +2341,7 @@ try_optimize_cfg (int mode)
 			}
 		    }
 		  delete_basic_block (b);
-		  if (!(mode & CLEANUP_CFGLAYOUT))
-		    changed = true;
+		  changed = true;
 		  /* Avoid trying to remove ENTRY_BLOCK_PTR.  */
 		  b = (c == ENTRY_BLOCK_PTR ? c->next_bb : c);
 		  continue;

gcc/testsuite/ChangeLog

+2011-01-26  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc.c-torture/compile/20110126-1.c: New test.
+
 2011-01-26  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/47473

gcc/testsuite/gcc.c-torture/compile/20110126-1.c

+/* PR rtl-optimization/44469 */
+/* Testcase by Siarhei Siamashka <siarhei.siamashka@gmail.com> */
+
+int a (int *t, const char *p)
+{
+  if (*t == 0)
+    {
+    }
+  else if (*t == 1)
+    {
+      p = (const char *)t;
+    }
+  else
+    __builtin_unreachable();
+  if (p[0])
+    return 0;
+  return 1;
+}