Index: function.c
===================================================================
--- function.c	(revision 191177)
+++ function.c	(working copy)
@@ -6063,6 +6063,7 @@
 	  FOR_EACH_EDGE (e, ei, tmp_bb->preds)
 	    if (single_succ_p (e->src)
 		&& !bitmap_bit_p (&bb_on_list, e->src->index)
+		&& (BB_PARTITION (e->src) == BB_PARTITION (e->dest))
 		&& can_duplicate_block_p (e->src))
 	      {
 		edge pe;