Fix PR44363: don't abort when the ifcvt analysis fails to recognize a Gimple stmt.

2010-06-02  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/44363
	* tree-if-conv.c (predicate_bbs): Do not call gcc_unreachable,
	return false instead.

From-SVN: r160163

gcc/ChangeLog

+2010-06-02  Sebastian Pop  <sebastian.pop@amd.com>
+
+	PR middle-end/44363
+	* tree-if-conv.c (predicate_bbs): Do not call gcc_unreachable,
+	return false instead.
+
 2010-06-02  Jan Hubicka  <jh@suse.cz>
 
 	PR middle-end/44295

gcc/tree-if-conv.c

@@ -483,8 +483,8 @@ get_loop_body_in_if_conv_order (const struct loop *loop)
    | else
    |   S2;
 
-   S1 will be predicated with "x", and S2 will be predicated with
-   "!x".  */
+   S1 will be predicated with "x", and
+   S2 will be predicated with "!x".  */
 
 static bool
 predicate_bbs (loop_p loop)
@@ -546,12 +546,9 @@ predicate_bbs (loop_p loop)
 		break;
 	      }
 
-	    case GIMPLE_SWITCH:
+	    default:
 	      /* Not handled yet in if-conversion.  */
 	      return false;
-
-	    default:
-	      gcc_unreachable ();
 	    }
 	}